Android中标签TagLayout支持单选多选

90 阅读 0 评论 60 点赞

我是靠谱客的博主贪玩小伙，这篇文章主要介绍Android中标签TagLayout支持单选多选，现在分享给大家，希望可以做个参考。

首先给出主控件主要代码

复制代码

public class TagLayout extends ViewGroup {
    private static final String INSTANCE_STATE = "saved_instance";
    private static final String TAGS = "tags";
    private static final String SELECTED_TAG_POSITIONS = "selected_tag_positions";
    private static final int SELECT_MODE_NONE = 0;
    private static final int SELECT_MODE_SINGLE = 1;
    private static final int SELECT_MODE_MULTIPLE = 2;
    private static final int CACHE_MODE_AUTO = 0;
    private static final int CACHE_MODE_LAZY = 1;
    private static final int CACHE_MODE_NONE = 2;
    private static final int LINES_CACHE_COUNT = 10;
    public static final int MAX_PRE_CACHE_COUNT = 30;
    private static final String DEFAULT_TEXT = "";
    private int mTagSelectMode = SELECT_MODE_NONE;
    private Integer mTagTextSize;
    private Integer mTagResId;
    private List<TagLine> mTagLines = new ArrayList<>();
    private int mHorizontalSpace = 0;
    private int mVerticalSpace = 0;
    private int maxLines = Integer.MAX_VALUE;
    private int mMaximumSelectionCount = Integer.MAX_VALUE;
    private List<String> mTags;
    private LayoutInflater mInflater;
    private Integer mTagBackground;
    private Integer mTagMinWidth;
    private ColorStateList mTagTextColor;
    private Integer mTagTextHorizontalPadding;
    private Integer mTagTextVerticalPadding;
    //
    private int mCacheMode;
    private int mMaxTags;
    private boolean mUsePreCache = false;
    private TextView mCurrentSelected;
    private boolean mHasMeasured = false;
    private int mLastWidthMeasureSpec;
    private int mLastHeightMeasureSpec;
    private int mLastMeasureWidth;
    private int mLstMeasureHeight;

private int mSelectedChildCount;

public List<String> getTags() {
        return mTags;
    }

public interface OnSelectChangeListener {
        void onSelectChange(TagLayout parent, TextView child, int index, boolean isSelected);
    }

public interface OnItemClickListener {
        void onItemClick(TextView child, int index);
    }

private OnSelectChangeListener onSelectChangeListener;
    private OnItemClickListener onItemClickListener;

public void setOnSelectChangeListener(OnSelectChangeListener onSelectChangeListener) {
        this.onSelectChangeListener = onSelectChangeListener;
    }

public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
        this.onItemClickListener = onItemClickListener;
    }

public TagLayout(Context context) {
        super(context);
        mInflater = LayoutInflater.from(context);
    }

public TagLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        mInflater = LayoutInflater.from(context);
        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.TagLayout);
        if (a != null) {
            mHorizontalSpace = a.getDimensionPixelOffset(R.styleable.TagLayout_horizontalSpace, 0);
            mVerticalSpace = a.getDimensionPixelOffset(R.styleable.TagLayout_verticalSpace, 0);
            maxLines = a.getInteger(R.styleable.TagLayout_maxLines, Integer.MAX_VALUE);
            mUsePreCache = a.getBoolean(R.styleable.TagLayout_preCache, false);
            mMaximumSelectionCount = a.getInteger(R.styleable.TagLayout_maximumSelectionCount, Integer.MAX_VALUE);
            mCacheMode = a.getInt(R.styleable.TagLayout_cacheMode, CACHE_MODE_AUTO);
            mMaxTags = a.getInteger(R.styleable.TagLayout_maxTags, Integer.MAX_VALUE);
            if (a.hasValue(R.styleable.TagLayout_tagResId)) {
                mTagResId = a.getResourceId(R.styleable.TagLayout_tagResId, -1);
            }
            if (a.hasValue(R.styleable.TagLayout_tagTextSize)) {
                mTagTextSize = a.getDimensionPixelSize(R.styleable.TagLayout_tagTextSize, 0);
            }
            if (a.hasValue(R.styleable.TagLayout_tagBackground)) {
                mTagBackground = a.getResourceId(R.styleable.TagLayout_tagBackground, -1);
            }
            if (a.hasValue(R.styleable.TagLayout_tagTextColor)) {
                mTagTextColor = a.getColorStateList(R.styleable.TagLayout_tagTextColor);
            }
            if (a.hasValue(R.styleable.TagLayout_tagTextHorizontalPadding)) {
                mTagTextHorizontalPadding = a.getDimensionPixelOffset(R.styleable.TagLayout_tagTextHorizontalPadding, 0);
            }
            if (a.hasValue(R.styleable.TagLayout_tagTextVerticalPadding)) {
                mTagTextVerticalPadding = a.getDimensionPixelOffset(R.styleable.TagLayout_tagTextVerticalPadding, 0);
            }
            if (a.hasValue(R.styleable.TagLayout_tagSelectMode)) {
                mTagSelectMode = a.getInt(R.styleable.TagLayout_tagSelectMode, SELECT_MODE_NONE);
            }
            if (a.hasValue(R.styleable.TagLayout_tagMinWidth)) {
                mTagMinWidth = a.getDimensionPixelOffset(R.styleable.TagLayout_tagMinWidth, 0);
            }
            a.recycle();
        }
        if (mUsePreCache) {
            int count = Math.min(MAX_PRE_CACHE_COUNT, Math.min(mMaxTags, maxLines * LINES_CACHE_COUNT));
            for (int i = 0; i < count; i++) {
                TextView tagView = addTag(DEFAULT_TEXT);
                tagView.setVisibility(View.INVISIBLE);
            }
        }
    }

private TextView addTag(final String tagText) {
        TextView addedTag;
        if (mTagResId != null) {
            addedTag = (TextView) mInflater.inflate(mTagResId, null);
        } else {
            addedTag = new TextView(getContext());
            addedTag.setGravity(Gravity.CENTER);
        }
        final TextView tagView = addedTag;
        if (hasValue(mTagBackground)) {
            tagView.setBackgroundResource(mTagBackground);
        }
        if (hasValue(mTagTextSize)) {
            tagView.setTextSize(TypedValue.COMPLEX_UNIT_PX, mTagTextSize);
        }
        if (hasValue(mTagTextColor)) {
            tagView.setTextColor(mTagTextColor);
        }
        if (hasValue(mTagMinWidth)) {
            tagView.setMinWidth(mTagMinWidth);
        }
        int paddingLeft = tagView.getPaddingLeft();
        int paddingRight = tagView.getPaddingRight();
        int paddingTop = tagView.getPaddingTop();
        int paddingBottom = tagView.getPaddingBottom();

if (hasValue(mTagTextHorizontalPadding)) {
            paddingLeft = mTagTextHorizontalPadding;
            paddingRight = mTagTextHorizontalPadding;
        }
        if (hasValue(mTagTextVerticalPadding)) {
            paddingTop = mTagTextVerticalPadding;
            paddingBottom = mTagTextVerticalPadding;
        }
        tagView.setPadding(paddingLeft, paddingTop, paddingRight, paddingBottom);
        tagView.setText(tagText);
        final int position = getChildCount();
        tagView.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                if (tagView.getVisibility() != View.VISIBLE)
                    return;
                if (onItemClickListener != null) {
                    onItemClickListener.onItemClick(tagView, position);
                }
                if (mTagSelectMode == SELECT_MODE_MULTIPLE) {
                    if (mSelectedChildCount >= mMaximumSelectionCount && !tagView.isSelected()) {
                        return;
                    }
                    tagView.setSelected(!tagView.isSelected());
                    if (tagView.isSelected()) {
                        mSelectedChildCount++;
                    } else {
                        mSelectedChildCount--;
                    }
                    if (onSelectChangeListener != null) {
                        onSelectChangeListener.onSelectChange(TagLayout.this, tagView, position, tagView.isSelected());
                    }
                } else if (mTagSelectMode == SELECT_MODE_SINGLE) {
                    if (mCurrentSelected != null) {
                        mCurrentSelected.setSelected(false);
                    }
                    tagView.setSelected(true);
                    mSelectedChildCount = 1;
                    mCurrentSelected = tagView;
                    if (onSelectChangeListener != null) {
                        onSelectChangeListener.onSelectChange(TagLayout.this, tagView, position, tagView.isSelected());
                    }

}
            }
        });
        addView(tagView);
        return tagView;
    }

private boolean hasValue(Object value) {
        return value != null;
    }

@Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        if (mHasMeasured && mLastWidthMeasureSpec == widthMeasureSpec && mLastHeightMeasureSpec == heightMeasureSpec) {
            setMeasuredDimension(mLastMeasureWidth, mLstMeasureHeight);
            return;
        }
        mTagLines.clear();
        int parentSuggestWidth = getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec);
        TagLine tagLine = null;
        int maxWidth = parentSuggestWidth - getPaddingLeft() - getPaddingRight();
        for (int i = 0; i < getChildCount(); i++) {
            View child = getChildAt(i);
            if (child.getVisibility() == View.GONE) {
                continue;
            }
            measureChild(child, widthMeasureSpec, heightMeasureSpec);
            if (tagLine == null) {
                tagLine = newTagLine(maxWidth);
            } else {
                if (!tagLine.accept(child)) {
                    if (mTagLines.size() == maxLines) {
                        for (int hiddenIndex = i; hiddenIndex < getChildCount(); hiddenIndex++) {
                            getChildAt(hiddenIndex).setVisibility(View.GONE);
                        }
                        break;
                    }
                    tagLine = newTagLine(maxWidth);
                }
            }
            tagLine.addView(child);
        }
        int measureHeight = getPaddingTop() + getPaddingBottom();
        for (int i = 0; i < mTagLines.size(); i++) {
            measureHeight += mTagLines.get(i).height;
            if (i != mTagLines.size() - 1) {
                measureHeight += mVerticalSpace;
            }
        }
        setMeasuredDimension(mLastMeasureWidth = parentSuggestWidth, mLstMeasureHeight = resolveSize(measureHeight, heightMeasureSpec));
        mLastWidthMeasureSpec = widthMeasureSpec;
        mLastHeightMeasureSpec = heightMeasureSpec;
        mHasMeasured = true;
    }

@Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        int marginTop = getPaddingTop();
        int marginLeft = getPaddingLeft();
        for (int i = 0; i < mTagLines.size(); i++) {
            TagLine line = mTagLines.get(i);
            line.layout(marginLeft, marginTop);
            marginTop += mVerticalSpace + line.height;
        }
    }

@Override
    protected Parcelable onSaveInstanceState() {
        final Bundle bundle = new Bundle();
        bundle.putParcelable(INSTANCE_STATE, super.onSaveInstanceState());
        if (mTags != null) {
            bundle.putStringArrayList(TAGS, wrap(mTags));
        }
        List<Integer> selectedPositions = getSelectedTagPositions();
        if (selectedPositions != null) {
            bundle.putIntegerArrayList(SELECTED_TAG_POSITIONS, wrap(selectedPositions));
        }
        return bundle;

}

@Override
    protected void onRestoreInstanceState(Parcelable state) {
        if (state instanceof Bundle) {
            Bundle bundle = (Bundle) state;
            mTags = bundle.getStringArrayList(TAGS);
            List<Integer> selectedTagPositions = bundle.getIntegerArrayList(SELECTED_TAG_POSITIONS);
            if (selectedTagPositions != null && selectedTagPositions.size() > 0) {
                if (getChildCount() > selectedTagPositions.size()) {
                    if (mTagSelectMode == SELECT_MODE_MULTIPLE) {
                        selectTagPositions(selectedTagPositions);
                    } else if (selectedTagPositions.size() > 0) {
                        selectTagPosition(selectedTagPositions.get(0));
                    }
                }
            }
            super.onRestoreInstanceState(bundle.getParcelable(INSTANCE_STATE));
        } else {
            super.onRestoreInstanceState(state);
        }

}

public interface TagTextConverter<T> {
        String convert(T t);
    }

public <T> void setTagObjects(List<T> tagObjects, TagTextConverter<T> tagTextConverter) {
        setTagObjects(tagObjects, tagTextConverter, null);
    }

public <T> void setTagObjects(List<T> tagObjects, TagTextConverter<T> tagTextConverter, ViewCreatedCallback viewCreatedCallback) {
        List<String> tagsList = new ArrayList<>();
        for (T tagObject : tagObjects) {
            tagsList.add(tagTextConverter.convert(tagObject).trim());
        }
        setTags(tagsList, viewCreatedCallback);
    }

public void setTags(String... tagsList) {
        if (tagsList != null && tagsList.length > 0) {
            setTags(Arrays.asList(tagsList));
        }
    }

public interface ViewCreatedCallback {
        void onViewCreated(int position, TextView textView);
    }

public void setTags(List<String> tagsList) {
        setTags(tagsList, null);
    }

public void setTags(List<String> tagsList, ViewCreatedCallback viewCreatedCallback) {

mHasMeasured = false;
        if (this.mTags == tagsList) {
            return;
        }
        if (mCacheMode != CACHE_MODE_NONE) {//使用缓存
            int maxDisplayTags = Math.min(tagsList == null ? 0 : tagsList.size(), mMaxTags);
            int childCount = getChildCount();
            int availableCount = Math.min(maxDisplayTags, childCount);
            if (availableCount > 0) {
                for (int i = 0; i < availableCount; i++) {
                    TextView tagView = (TextView) getChildAt(i);
                    tagView.setVisibility(View.VISIBLE);
                    String tagText = tagsList.get(i);
                    tagView.setText(tagText);
                    if (viewCreatedCallback != null) {
                        viewCreatedCallback.onViewCreated(i, tagView);
                    }
                }
            }

if (childCount > maxDisplayTags) {
                List<View> removedViews = null;
                for (int i = availableCount; i < childCount; i++) {
                    TextView tagView = (TextView) getChildAt(i);
                    if (mCacheMode == CACHE_MODE_LAZY) {
                        tagView.setVisibility(View.GONE);
                    } else {
                        if (removedViews == null) {
                            removedViews = new ArrayList<>();
                        }
                        removedViews.add(tagView);
                    }
                }
                if (removedViews != null) {
                    for (View child : removedViews) {
                        removeView(child);
                    }
                    removedViews.clear();
                }
            } else if (childCount < maxDisplayTags) {
                int addedCount = maxDisplayTags - childCount;
                for (int i = 0; i < addedCount; i++) {
                    String tagText = tagsList.get(i + childCount);

TextView tag = addTag(tagText);
                    if (viewCreatedCallback != null) {
                        viewCreatedCallback.onViewCreated(i + childCount, tag);
                    }
                }
            }

} else {//删除 再添加
            removeAllViews();
            if (tagsList != null && tagsList.size() > 0) {
                for (int i = 0; i < tagsList.size(); i++) {
                    TextView tv = addTag(tagsList.get(i));
                    if (viewCreatedCallback != null) {
                        viewCreatedCallback.onViewCreated(i, tv);
                    }
                }
            }
        }

this.mTags = tagsList;
    }

private static <T> ArrayList<T> wrap(List<T> list) {
        if (list instanceof ArrayList) {
            return (ArrayList<T>) list;
        } else {
            return new ArrayList(list);
        }
    }

public void selectTagPositions(Integer... selectedPos) {
        selectTagPositions(Arrays.asList(selectedPos));
    }

public void selectTagPositions(List<Integer> selectedPos) {
        if (mTagSelectMode != SELECT_MODE_MULTIPLE) {
            throw new UnsupportedOperationException("this method only support in SELECT_MODE_MULTIPLE!");
        }
        int childCount = getChildCount();
        int selectedCount = 0;
        for (int i = 0; i < childCount; i++) {
            if (selectedPos.contains(i)) {
                getChildAt(i).setSelected(true);
                selectedCount++;
            } else {
                getChildAt(i).setSelected(false);
            }
        }
        mSelectedChildCount = selectedCount;
    }

public void selectTagPosition(int index) {
        if (mTagSelectMode != SELECT_MODE_SINGLE) {
            throw new UnsupportedOperationException("this method only support in SELECT_MODE_SINGLE!");
        }
        TextView tagView = (TextView) getChildAt(index);
        if (mCurrentSelected != tagView) {
            if (mCurrentSelected != null) {
                mCurrentSelected.setSelected(false);
            }
            mCurrentSelected = tagView;
            mCurrentSelected.setSelected(true);
            mSelectedChildCount = 1;
        }
    }

public void setMaximumSelectionCount(int maximumSelectionCount) {
        this.mMaximumSelectionCount = maximumSelectionCount;
    }

public int getSelectedTagPosition() {
        if (mTagSelectMode == SELECT_MODE_SINGLE && mCurrentSelected != null) {
            return indexOfChild(mCurrentSelected);
        }
        return -1;
    }

public String getSelectedTag() {
        int pos = getSelectedTagPosition();
        if (pos != -1) {
            return mTags.get(pos);
        }
        return null;
    }

public List<Integer> getSelectedTagPositions() {
        List<Integer> selectedList = new ArrayList<>();
        if (mTagSelectMode == SELECT_MODE_SINGLE && mCurrentSelected != null) {
            selectedList.add(indexOfChild(mCurrentSelected));
        } else {
            for (int i = 0; i < getChildCount(); i++) {
                if (getChildAt(i).getVisibility() == View.VISIBLE && getChildAt(i).isSelected()) {
                    selectedList.add(i);
                }
            }
        }
        return selectedList;
    }

private TagLine newTagLine(int maxWidth) {
        TagLine tagLine = new TagLine(maxWidth, mHorizontalSpace);
        mTagLines.add(tagLine);
        return tagLine;
    }

public class TagLine {
        private List<View> mTagViews = new ArrayList<>();
        private int totalWidth;
        private int space;
        private int usedWidth;
        private int height;

public TagLine(int totalWidth, int horizontalSpace) {
            this.totalWidth = totalWidth;
            this.space = horizontalSpace;
        }

public void addView(View child) {
            int childWidth = child.getMeasuredWidth();
            int childHeight = child.getMeasuredHeight();
            if (mTagViews.size() == 0) {
                if (childWidth > totalWidth) {
                    usedWidth = totalWidth;
                    height = childHeight;
                } else {
                    usedWidth = childWidth;
                    height = childHeight;
                }
            } else {
                usedWidth = usedWidth + space + childWidth;
                height = (childHeight > height) ? childHeight : height;
            }
            mTagViews.add(child);
        }

public boolean accept(View child) {
            int width = child.getMeasuredWidth();
            if (mTagViews.size() == 0) {
                return true;
            }
            if (usedWidth + width + space > totalWidth) {
                return false;
            }
            return true;
        }

public void layout(int marginLeft, int marginTop) {
            for (int i = 0; i < mTagViews.size(); i++) {
                View child = mTagViews.get(i);
                int childWidth = child.getMeasuredWidth();
                int childHeight = child.getMeasuredHeight();
                int extraTop = (int) ((height - childHeight) / 2f + 0.5f);
                int left = marginLeft;
                int top = marginTop + extraTop;
                int right = left + childWidth;
                int bottom = top + childHeight;
                child.layout(left, top, right, bottom);
                marginLeft += childWidth + space;
            }
        }
    }
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532

public class TagLayout extends ViewGroup {
    private static final String INSTANCE_STATE = "saved_instance";
    private static final String TAGS = "tags";
    private static final String SELECTED_TAG_POSITIONS = "selected_tag_positions";
    private static final int SELECT_MODE_NONE = 0;
    private static final int SELECT_MODE_SINGLE = 1;
    private static final int SELECT_MODE_MULTIPLE = 2;
    private static final int CACHE_MODE_AUTO = 0;
    private static final int CACHE_MODE_LAZY = 1;
    private static final int CACHE_MODE_NONE = 2;
    private static final int LINES_CACHE_COUNT = 10;
    public static final int MAX_PRE_CACHE_COUNT = 30;
    private static final String DEFAULT_TEXT = "";
    private int mTagSelectMode = SELECT_MODE_NONE;
    private Integer mTagTextSize;
    private Integer mTagResId;
    private List<TagLine> mTagLines = new ArrayList<>();
    private int mHorizontalSpace = 0;
    private int mVerticalSpace = 0;
    private int maxLines = Integer.MAX_VALUE;
    private int mMaximumSelectionCount = Integer.MAX_VALUE;
    private List<String> mTags;
    private LayoutInflater mInflater;
    private Integer mTagBackground;
    private Integer mTagMinWidth;
    private ColorStateList mTagTextColor;
    private Integer mTagTextHorizontalPadding;
    private Integer mTagTextVerticalPadding;
    //
    private int mCacheMode;
    private int mMaxTags;
    private boolean mUsePreCache = false;
    private TextView mCurrentSelected;
    private boolean mHasMeasured = false;
    private int mLastWidthMeasureSpec;
    private int mLastHeightMeasureSpec;
    private int mLastMeasureWidth;
    private int mLstMeasureHeight;

    private int mSelectedChildCount;

    public List<String> getTags() {
        return mTags;
    }

    public interface OnSelectChangeListener {
        void onSelectChange(TagLayout parent, TextView child, int index, boolean isSelected);
    }

    public interface OnItemClickListener {
        void onItemClick(TextView child, int index);
    }

    private OnSelectChangeListener onSelectChangeListener;
    private OnItemClickListener onItemClickListener;

    public void setOnSelectChangeListener(OnSelectChangeListener onSelectChangeListener) {
        this.onSelectChangeListener = onSelectChangeListener;
    }

    public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
        this.onItemClickListener = onItemClickListener;
    }

    public TagLayout(Context context) {
        super(context);
        mInflater = LayoutInflater.from(context);
    }

    public TagLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        mInflater = LayoutInflater.from(context);
        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.TagLayout);
        if (a != null) {
            mHorizontalSpace = a.getDimensionPixelOffset(R.styleable.TagLayout_horizontalSpace, 0);
            mVerticalSpace = a.getDimensionPixelOffset(R.styleable.TagLayout_verticalSpace, 0);
            maxLines = a.getInteger(R.styleable.TagLayout_maxLines, Integer.MAX_VALUE);
            mUsePreCache = a.getBoolean(R.styleable.TagLayout_preCache, false);
            mMaximumSelectionCount = a.getInteger(R.styleable.TagLayout_maximumSelectionCount, Integer.MAX_VALUE);
            mCacheMode = a.getInt(R.styleable.TagLayout_cacheMode, CACHE_MODE_AUTO);
            mMaxTags = a.getInteger(R.styleable.TagLayout_maxTags, Integer.MAX_VALUE);
            if (a.hasValue(R.styleable.TagLayout_tagResId)) {
                mTagResId = a.getResourceId(R.styleable.TagLayout_tagResId, -1);
            }
            if (a.hasValue(R.styleable.TagLayout_tagTextSize)) {
                mTagTextSize = a.getDimensionPixelSize(R.styleable.TagLayout_tagTextSize, 0);
            }
            if (a.hasValue(R.styleable.TagLayout_tagBackground)) {
                mTagBackground = a.getResourceId(R.styleable.TagLayout_tagBackground, -1);
            }
            if (a.hasValue(R.styleable.TagLayout_tagTextColor)) {
                mTagTextColor = a.getColorStateList(R.styleable.TagLayout_tagTextColor);
            }
            if (a.hasValue(R.styleable.TagLayout_tagTextHorizontalPadding)) {
                mTagTextHorizontalPadding = a.getDimensionPixelOffset(R.styleable.TagLayout_tagTextHorizontalPadding, 0);
            }
            if (a.hasValue(R.styleable.TagLayout_tagTextVerticalPadding)) {
                mTagTextVerticalPadding = a.getDimensionPixelOffset(R.styleable.TagLayout_tagTextVerticalPadding, 0);
            }
            if (a.hasValue(R.styleable.TagLayout_tagSelectMode)) {
                mTagSelectMode = a.getInt(R.styleable.TagLayout_tagSelectMode, SELECT_MODE_NONE);
            }
            if (a.hasValue(R.styleable.TagLayout_tagMinWidth)) {
                mTagMinWidth = a.getDimensionPixelOffset(R.styleable.TagLayout_tagMinWidth, 0);
            }
            a.recycle();
        }
        if (mUsePreCache) {
            int count = Math.min(MAX_PRE_CACHE_COUNT, Math.min(mMaxTags, maxLines * LINES_CACHE_COUNT));
            for (int i = 0; i < count; i++) {
                TextView tagView = addTag(DEFAULT_TEXT);
                tagView.setVisibility(View.INVISIBLE);
            }
        }
    }


    private TextView addTag(final String tagText) {
        TextView addedTag;
        if (mTagResId != null) {
            addedTag = (TextView) mInflater.inflate(mTagResId, null);
        } else {
            addedTag = new TextView(getContext());
            addedTag.setGravity(Gravity.CENTER);
        }
        final TextView tagView = addedTag;
        if (hasValue(mTagBackground)) {
            tagView.setBackgroundResource(mTagBackground);
        }
        if (hasValue(mTagTextSize)) {
            tagView.setTextSize(TypedValue.COMPLEX_UNIT_PX, mTagTextSize);
        }
        if (hasValue(mTagTextColor)) {
            tagView.setTextColor(mTagTextColor);
        }
        if (hasValue(mTagMinWidth)) {
            tagView.setMinWidth(mTagMinWidth);
        }
        int paddingLeft = tagView.getPaddingLeft();
        int paddingRight = tagView.getPaddingRight();
        int paddingTop = tagView.getPaddingTop();
        int paddingBottom = tagView.getPaddingBottom();

        if (hasValue(mTagTextHorizontalPadding)) {
            paddingLeft = mTagTextHorizontalPadding;
            paddingRight = mTagTextHorizontalPadding;
        }
        if (hasValue(mTagTextVerticalPadding)) {
            paddingTop = mTagTextVerticalPadding;
            paddingBottom = mTagTextVerticalPadding;
        }
        tagView.setPadding(paddingLeft, paddingTop, paddingRight, paddingBottom);
        tagView.setText(tagText);
        final int position = getChildCount();
        tagView.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                if (tagView.getVisibility() != View.VISIBLE)
                    return;
                if (onItemClickListener != null) {
                    onItemClickListener.onItemClick(tagView, position);
                }
                if (mTagSelectMode == SELECT_MODE_MULTIPLE) {
                    if (mSelectedChildCount >= mMaximumSelectionCount && !tagView.isSelected()) {
                        return;
                    }
                    tagView.setSelected(!tagView.isSelected());
                    if (tagView.isSelected()) {
                        mSelectedChildCount++;
                    } else {
                        mSelectedChildCount--;
                    }
                    if (onSelectChangeListener != null) {
                        onSelectChangeListener.onSelectChange(TagLayout.this, tagView, position, tagView.isSelected());
                    }
                } else if (mTagSelectMode == SELECT_MODE_SINGLE) {
                    if (mCurrentSelected != null) {
                        mCurrentSelected.setSelected(false);
                    }
                    tagView.setSelected(true);
                    mSelectedChildCount = 1;
                    mCurrentSelected = tagView;
                    if (onSelectChangeListener != null) {
                        onSelectChangeListener.onSelectChange(TagLayout.this, tagView, position, tagView.isSelected());
                    }

                }
            }
        });
        addView(tagView);
        return tagView;
    }

    private boolean hasValue(Object value) {
        return value != null;
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        if (mHasMeasured && mLastWidthMeasureSpec == widthMeasureSpec && mLastHeightMeasureSpec == heightMeasureSpec) {
            setMeasuredDimension(mLastMeasureWidth, mLstMeasureHeight);
            return;
        }
        mTagLines.clear();
        int parentSuggestWidth = getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec);
        TagLine tagLine = null;
        int maxWidth = parentSuggestWidth - getPaddingLeft() - getPaddingRight();
        for (int i = 0; i < getChildCount(); i++) {
            View child = getChildAt(i);
            if (child.getVisibility() == View.GONE) {
                continue;
            }
            measureChild(child, widthMeasureSpec, heightMeasureSpec);
            if (tagLine == null) {
                tagLine = newTagLine(maxWidth);
            } else {
                if (!tagLine.accept(child)) {
                    if (mTagLines.size() == maxLines) {
                        for (int hiddenIndex = i; hiddenIndex < getChildCount(); hiddenIndex++) {
                            getChildAt(hiddenIndex).setVisibility(View.GONE);
                        }
                        break;
                    }
                    tagLine = newTagLine(maxWidth);
                }
            }
            tagLine.addView(child);
        }
        int measureHeight = getPaddingTop() + getPaddingBottom();
        for (int i = 0; i < mTagLines.size(); i++) {
            measureHeight += mTagLines.get(i).height;
            if (i != mTagLines.size() - 1) {
                measureHeight += mVerticalSpace;
            }
        }
        setMeasuredDimension(mLastMeasureWidth = parentSuggestWidth, mLstMeasureHeight = resolveSize(measureHeight, heightMeasureSpec));
        mLastWidthMeasureSpec = widthMeasureSpec;
        mLastHeightMeasureSpec = heightMeasureSpec;
        mHasMeasured = true;
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        int marginTop = getPaddingTop();
        int marginLeft = getPaddingLeft();
        for (int i = 0; i < mTagLines.size(); i++) {
            TagLine line = mTagLines.get(i);
            line.layout(marginLeft, marginTop);
            marginTop += mVerticalSpace + line.height;
        }
    }


    @Override
    protected Parcelable onSaveInstanceState() {
        final Bundle bundle = new Bundle();
        bundle.putParcelable(INSTANCE_STATE, super.onSaveInstanceState());
        if (mTags != null) {
            bundle.putStringArrayList(TAGS, wrap(mTags));
        }
        List<Integer> selectedPositions = getSelectedTagPositions();
        if (selectedPositions != null) {
            bundle.putIntegerArrayList(SELECTED_TAG_POSITIONS, wrap(selectedPositions));
        }
        return bundle;

    }

    @Override
    protected void onRestoreInstanceState(Parcelable state) {
        if (state instanceof Bundle) {
            Bundle bundle = (Bundle) state;
            mTags = bundle.getStringArrayList(TAGS);
            List<Integer> selectedTagPositions = bundle.getIntegerArrayList(SELECTED_TAG_POSITIONS);
            if (selectedTagPositions != null && selectedTagPositions.size() > 0) {
                if (getChildCount() > selectedTagPositions.size()) {
                    if (mTagSelectMode == SELECT_MODE_MULTIPLE) {
                        selectTagPositions(selectedTagPositions);
                    } else if (selectedTagPositions.size() > 0) {
                        selectTagPosition(selectedTagPositions.get(0));
                    }
                }
            }
            super.onRestoreInstanceState(bundle.getParcelable(INSTANCE_STATE));
        } else {
            super.onRestoreInstanceState(state);
        }

    }

    public interface TagTextConverter<T> {
        String convert(T t);
    }

    public <T> void setTagObjects(List<T> tagObjects, TagTextConverter<T> tagTextConverter) {
        setTagObjects(tagObjects, tagTextConverter, null);
    }

    public <T> void setTagObjects(List<T> tagObjects, TagTextConverter<T> tagTextConverter, ViewCreatedCallback viewCreatedCallback) {
        List<String> tagsList = new ArrayList<>();
        for (T tagObject : tagObjects) {
            tagsList.add(tagTextConverter.convert(tagObject).trim());
        }
        setTags(tagsList, viewCreatedCallback);
    }

    public void setTags(String... tagsList) {
        if (tagsList != null && tagsList.length > 0) {
            setTags(Arrays.asList(tagsList));
        }
    }

    public interface ViewCreatedCallback {
        void onViewCreated(int position, TextView textView);
    }

    public void setTags(List<String> tagsList) {
        setTags(tagsList, null);
    }

    public void setTags(List<String> tagsList, ViewCreatedCallback viewCreatedCallback) {

        mHasMeasured = false;
        if (this.mTags == tagsList) {
            return;
        }
        if (mCacheMode != CACHE_MODE_NONE) {//使用缓存
            int maxDisplayTags = Math.min(tagsList == null ? 0 : tagsList.size(), mMaxTags);
            int childCount = getChildCount();
            int availableCount = Math.min(maxDisplayTags, childCount);
            if (availableCount > 0) {
                for (int i = 0; i < availableCount; i++) {
                    TextView tagView = (TextView) getChildAt(i);
                    tagView.setVisibility(View.VISIBLE);
                    String tagText = tagsList.get(i);
                    tagView.setText(tagText);
                    if (viewCreatedCallback != null) {
                        viewCreatedCallback.onViewCreated(i, tagView);
                    }
                }
            }

            if (childCount > maxDisplayTags) {
                List<View> removedViews = null;
                for (int i = availableCount; i < childCount; i++) {
                    TextView tagView = (TextView) getChildAt(i);
                    if (mCacheMode == CACHE_MODE_LAZY) {
                        tagView.setVisibility(View.GONE);
                    } else {
                        if (removedViews == null) {
                            removedViews = new ArrayList<>();
                        }
                        removedViews.add(tagView);
                    }
                }
                if (removedViews != null) {
                    for (View child : removedViews) {
                        removeView(child);
                    }
                    removedViews.clear();
                }
            } else if (childCount < maxDisplayTags) {
                int addedCount = maxDisplayTags - childCount;
                for (int i = 0; i < addedCount; i++) {
                    String tagText = tagsList.get(i + childCount);

                    TextView tag = addTag(tagText);
                    if (viewCreatedCallback != null) {
                        viewCreatedCallback.onViewCreated(i + childCount, tag);
                    }
                }
            }


        } else {//删除 再添加
            removeAllViews();
            if (tagsList != null && tagsList.size() > 0) {
                for (int i = 0; i < tagsList.size(); i++) {
                    TextView tv = addTag(tagsList.get(i));
                    if (viewCreatedCallback != null) {
                        viewCreatedCallback.onViewCreated(i, tv);
                    }
                }
            }
        }

        this.mTags = tagsList;
    }

    private static <T> ArrayList<T> wrap(List<T> list) {
        if (list instanceof ArrayList) {
            return (ArrayList<T>) list;
        } else {
            return new ArrayList(list);
        }
    }

    public void selectTagPositions(Integer... selectedPos) {
        selectTagPositions(Arrays.asList(selectedPos));
    }

    public void selectTagPositions(List<Integer> selectedPos) {
        if (mTagSelectMode != SELECT_MODE_MULTIPLE) {
            throw new UnsupportedOperationException("this method only support in SELECT_MODE_MULTIPLE!");
        }
        int childCount = getChildCount();
        int selectedCount = 0;
        for (int i = 0; i < childCount; i++) {
            if (selectedPos.contains(i)) {
                getChildAt(i).setSelected(true);
                selectedCount++;
            } else {
                getChildAt(i).setSelected(false);
            }
        }
        mSelectedChildCount = selectedCount;
    }

    public void selectTagPosition(int index) {
        if (mTagSelectMode != SELECT_MODE_SINGLE) {
            throw new UnsupportedOperationException("this method only support in SELECT_MODE_SINGLE!");
        }
        TextView tagView = (TextView) getChildAt(index);
        if (mCurrentSelected != tagView) {
            if (mCurrentSelected != null) {
                mCurrentSelected.setSelected(false);
            }
            mCurrentSelected = tagView;
            mCurrentSelected.setSelected(true);
            mSelectedChildCount = 1;
        }
    }

    public void setMaximumSelectionCount(int maximumSelectionCount) {
        this.mMaximumSelectionCount = maximumSelectionCount;
    }

    public int getSelectedTagPosition() {
        if (mTagSelectMode == SELECT_MODE_SINGLE && mCurrentSelected != null) {
            return indexOfChild(mCurrentSelected);
        }
        return -1;
    }

    public String getSelectedTag() {
        int pos = getSelectedTagPosition();
        if (pos != -1) {
            return mTags.get(pos);
        }
        return null;
    }

    public List<Integer> getSelectedTagPositions() {
        List<Integer> selectedList = new ArrayList<>();
        if (mTagSelectMode == SELECT_MODE_SINGLE && mCurrentSelected != null) {
            selectedList.add(indexOfChild(mCurrentSelected));
        } else {
            for (int i = 0; i < getChildCount(); i++) {
                if (getChildAt(i).getVisibility() == View.VISIBLE && getChildAt(i).isSelected()) {
                    selectedList.add(i);
                }
            }
        }
        return selectedList;
    }

    private TagLine newTagLine(int maxWidth) {
        TagLine tagLine = new TagLine(maxWidth, mHorizontalSpace);
        mTagLines.add(tagLine);
        return tagLine;
    }


    public class TagLine {
        private List<View> mTagViews = new ArrayList<>();
        private int totalWidth;
        private int space;
        private int usedWidth;
        private int height;

        public TagLine(int totalWidth, int horizontalSpace) {
            this.totalWidth = totalWidth;
            this.space = horizontalSpace;
        }

        public void addView(View child) {
            int childWidth = child.getMeasuredWidth();
            int childHeight = child.getMeasuredHeight();
            if (mTagViews.size() == 0) {
                if (childWidth > totalWidth) {
                    usedWidth = totalWidth;
                    height = childHeight;
                } else {
                    usedWidth = childWidth;
                    height = childHeight;
                }
            } else {
                usedWidth = usedWidth + space + childWidth;
                height = (childHeight > height) ? childHeight : height;
            }
            mTagViews.add(child);
        }

        public boolean accept(View child) {
            int width = child.getMeasuredWidth();
            if (mTagViews.size() == 0) {
                return true;
            }
            if (usedWidth + width + space > totalWidth) {
                return false;
            }
            return true;
        }

        public void layout(int marginLeft, int marginTop) {
            for (int i = 0; i < mTagViews.size(); i++) {
                View child = mTagViews.get(i);
                int childWidth = child.getMeasuredWidth();
                int childHeight = child.getMeasuredHeight();
                int extraTop = (int) ((height - childHeight) / 2f + 0.5f);
                int left = marginLeft;
                int top = marginTop + extraTop;
                int right = left + childWidth;
                int bottom = top + childHeight;
                child.layout(left, top, right, bottom);
                marginLeft += childWidth + space;
            }
        }
    }
}

然后在自定义的attrs.xml中增加

复制代码

</declare-styleable>

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
    <attr name="horizontalSpace" format="dimension" /><!-- tag之间的横向间距-->
    <attr name="verticalSpace" format="dimension" /><!-- tag之间的纵向间距-->
    <attr name="tagResId" format="reference" /><!-- tag自定义布局的资源id-->
    <attr name="tagTextSize" format="dimension" /><!-- tag文字大小-->
    <attr name="tagBackground" format="reference" /><!-- tag背景-->
    <attr name="tagMinWidth" format="dimension" /><!-- tag最小宽度-->
    <attr name="tagTextColor" format="color" /><!-- tag文字颜色-->
    <attr name="tagTextHorizontalPadding" format="dimension" /><!-- tag 内部横向padding-->
    <attr name="tagTextVerticalPadding" format="dimension" /><!-- tag 内部纵向padding-->
    <declare-styleable name="TagLayout">
        <attr name="horizontalSpace" />
        <attr name="verticalSpace" />
        <attr name="tagResId" />
        <attr name="tagTextSize" />
        <attr name="tagBackground" />
        <attr name="tagMinWidth" />
        <attr name="tagTextColor" />
        <attr name="tagTextHorizontalPadding" />
        <attr name="tagTextVerticalPadding" />
        <attr name="maxLines" format="integer" /><!-- 最大行数-->
        <attr name="maximumSelectionCount" format="integer" /><!-- 设置最多能够选择的个数-->
        <attr name="tagSelectMode" format="enum"><!-- 单选 多选-->
            <enum name="single" value="1"></enum><!--单选-->
            <enum name="multiple" value="2"></enum><!--多选-->
            <enum name="none" value="0"></enum><!--不可选-->
        </attr>
        <!--以下配置建议在列表中提高性能使用-->
        <attr name="cacheMode" format="enum"><!-- 缓存方式，常用方式下没有影响，当tag需要在RecycleView或者ListView中显示，合理设置能显著提高性能-->
            <enum name="auto" value="0"></enum><!--自动根据当前tag数量来增删childView，默认方式-->
            <enum name="lazy" value="1"></enum><!--tag数量会根据最大tag数量来决定，大于会等于tag数量的childView自动隐藏，性能最佳-->
            <enum name="none" value="2"></enum><!--不使用缓存-->
        </attr>
        <attr name="maxTags" format="integer" /><!--tags最大数量-->
        <attr name="preCache" format="boolean" /><!-- 预缓存，初始化时预先添加一定数量的childView-->

    </declare-styleable>

通过上面的<declare-styleable name="TagLayout">很容易看出来用法下面就是布局中的用法

复制代码

<com.xxx.xxxx.widget.TagLayout
                            android:id="@+id/tagLayout"
                            android:layout_width="0dp"
                            android:layout_height="wrap_content"
                            android:layout_marginLeft="@dimen/w14"
                            android:layout_marginTop="@dimen/w6"
                            android:layout_marginRight="@dimen/w15"
                            app:horizontalSpace="@dimen/w10"
                            app:layout_constraintLeft_toRightOf="@id/img_content"
                            app:layout_constraintRight_toLeftOf="@id/tvMoney"
                            app:layout_constraintTop_toBottomOf="@id/tvStage"
                            app:tagBackground="@drawable/bg_guild_tag_red_r20"
                            app:tagSelectMode="single"
                            app:tagTextHorizontalPadding="@dimen/w8"
                            app:tagTextSize="@dimen/sp11"
                            app:tagTextVerticalPadding="@dimen/w2"
                            app:verticalSpace="@dimen/w10" ></com>

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
 <com.xxx.xxxx.widget.TagLayout
                            android:id="@+id/tagLayout"
                            android:layout_width="0dp"
                            android:layout_height="wrap_content"
                            android:layout_marginLeft="@dimen/w14"
                            android:layout_marginTop="@dimen/w6"
                            android:layout_marginRight="@dimen/w15"
                            app:horizontalSpace="@dimen/w10"
                            app:layout_constraintLeft_toRightOf="@id/img_content"
                            app:layout_constraintRight_toLeftOf="@id/tvMoney"
                            app:layout_constraintTop_toBottomOf="@id/tvStage"
                            app:tagBackground="@drawable/bg_guild_tag_red_r20"
                            app:tagSelectMode="single"
                            app:tagTextHorizontalPadding="@dimen/w8"
                            app:tagTextSize="@dimen/sp11"
                            app:tagTextVerticalPadding="@dimen/w2"
                            app:verticalSpace="@dimen/w10" />

可以看到app开头的都是在attrs.xml中定义的了所以自己加什么属性可以更具项目自己配置

上面是整个TagLayout 的代码

············································································

下面就是整个Taglayout的在Activity中的使用

复制代码

1
2
3

复制代码

1
2
3
4
5
6
7
8
9
10
 tagLayout.setTagObjects(label, topicInfo -> topicInfo, (position, textView) -> {
                textView.setPadding(4, 1, 4, 1);
                if (position % 2 == 0) {
                    textView.setBackgroundResource(R.drawable.bg_search_tag_fe784b_10_r20);
                    textView.setTextColor(getContext().getResources().getColor(R.color.color_FE784B));
                } else {
                    textView.setBackgroundResource(R.drawable.bg_search_tag_10_r20);
                    textView.setTextColor(getContext().getResources().getColor(R.color.color_13C5CD));
                }
            });