Android实现本地图片选择及预览缩放效果仿春雨医生

在做项目时常常会遇到选择本地图片的需求。曾经都是懒得写直接调用系统方法来选择图片。可是这样并不能实现多选效果。近期又遇到了，所以还是写一个demo好了。以后也方便使用。还是首先来看看效果

显示的图片使用RecyclerView实现的，利用Glide来载入；以下弹出的图片目录效果是採用PopupWindow实现，这里比採用PopupWindow更方便，弹出显示的左边图片是这个目录里的第一张图片；选中的图片能够进行预览，使用网上一个大神写的来实现的；至于图片的获取是用ContentProvider。

看看主界面的布局文件。上面一栏是一个返回button和一个跳转预览界面的button。依据是否有选中的图片来设置它的点击和显示状态。中间就是一个用于显示图片的RecyclerView，左下角是显示目录的名字可点击切换。右下角就是确定button。

复制代码<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context="com.cdxsc.imageselect_y.ImageSelecteActivity"> <RelativeLayout android:layout_width="match_parent" android:layout_height="45dp" android:background="@android:color/white"> <ImageButton android:id="@+id/ib_back" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerVertical="true" android:layout_marginLeft="10dp" android:background="@mipmap/action_bar_back_normal" ></ImageButton> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerVertical="true" android:layout_marginLeft="10dp" android:layout_toRightOf="@id/ib_back" android:text="选择图片" android:textColor="#000" android:textSize="16sp" ></TextView> <TextView android:id="@+id/tv_preview" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" android:layout_centerVertical="true" android:layout_marginRight="10dp" android:enabled="false" android:text="预览" android:textColor="#BEBFBF" android:textSize="16sp" ></TextView> </RelativeLayout> <View android:layout_width="match_parent" android:layout_height="0.5dp" android:background="#eeeeee" ></View> <android.support.v7.widget.RecyclerView android:id="@+id/rv" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1"></android.support.v7.widget.RecyclerView> <RelativeLayout android:layout_width="match_parent" android:layout_height="50dp"> <TextView android:id="@+id/tv_allPic" android:layout_width="wrap_content" android:layout_height="match_parent" android:layout_centerVertical="true" android:layout_marginLeft="10dp" android:clickable="true" android:gravity="center_vertical" android:text="全部图片" android:textColor="@android:color/black" android:textSize="16sp" ></TextView> <Button android:id="@+id/bt_confirm" android:layout_width="wrap_content" android:layout_height="35dp" android:layout_alignParentRight="true" android:layout_centerVertical="true" android:layout_marginRight="10dp" android:background="@drawable/shape_disable" android:enabled="false" android:text="确定" android:textColor="#676767" android:textSize="16sp" ></Button> </RelativeLayout> </LinearLayout>

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.cdxsc.imageselect_y.ImageSelecteActivity">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="45dp"
android:background="@android:color/white">
<ImageButton
android:id="@+id/ib_back"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginLeft="10dp"
android:background="@mipmap/action_bar_back_normal" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginLeft="10dp"
android:layout_toRightOf="@id/ib_back"
android:text="选择图片"
android:textColor="#000"
android:textSize="16sp" />
<TextView
android:id="@+id/tv_preview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_marginRight="10dp"
android:enabled="false"
android:text="预览"
android:textColor="#BEBFBF"
android:textSize="16sp" />
</RelativeLayout>
<View
android:layout_width="match_parent"
android:layout_height="0.5dp"
android:background="#eeeeee" />
<android.support.v7.widget.RecyclerView
android:id="@+id/rv"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"></android.support.v7.widget.RecyclerView>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="50dp">
<TextView
android:id="@+id/tv_allPic"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_centerVertical="true"
android:layout_marginLeft="10dp"
android:clickable="true"
android:gravity="center_vertical"
android:text="全部图片"
android:textColor="@android:color/black"
android:textSize="16sp" />
<Button
android:id="@+id/bt_confirm"
android:layout_width="wrap_content"
android:layout_height="35dp"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_marginRight="10dp"
android:background="@drawable/shape_disable"
android:enabled="false"
android:text="确定"
android:textColor="#676767"
android:textSize="16sp" />
</RelativeLayout>
</LinearLayout>

好了。如今看主界面的代码

复制代码public class ImageSelecteActivity extends AppCompatActivity { private static final String TAG = "lzy"; @BindView(R.id.ib_back) ImageButton mButtonBack; @BindView(R.id.tv_preview) TextView mTextViewPreview; @BindView(R.id.rv) RecyclerView mRecyclerView; @BindView(R.id.tv_allPic) TextView mTextViewAllPic; @BindView(R.id.bt_confirm) Button mButtonConfirm; private GalleryPopupWindow mPopupWindow; //存储每一个目录下的图片路径,key是文件名称 private Map<String, List<String>> mGroupMap = new HashMap<>(); private List<ImageBean> list = new ArrayList<>(); //当前目录显示的图片路径 private List<String> listPath = new ArrayList<>(); //所选择的图片路径集合 private ArrayList<String> listSelectedPath = new ArrayList<>(); private Handler mHandler = new Handler() { @Override public void handleMessage(Message msg) { //扫描完毕后 getGalleryList(); listPath.clear(); listPath.addAll(mGroupMap.get("全部图片")); adapter.update(listPath); if (mPopupWindow != null) mPopupWindow.notifyDataChanged(); } }; private ImageSelectAdapter adapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_image_selecte); ButterKnife.bind(this); init(); } private void init() { getImages(); mRecyclerView.setLayoutManager(new GridLayoutManager(ImageSelecteActivity.this, 3)); adapter = new ImageSelectAdapter(this, listPath); mRecyclerView.setAdapter(adapter); adapter.setOnCheckedChangedListener(onCheckedChangedListener); } @OnClick({R.id.ib_back, R.id.tv_preview, R.id.tv_allPic, R.id.bt_confirm}) public void onClick(View view) { switch (view.getId()) { case R.id.ib_back: finish(); break; case R.id.tv_preview://跳转预览界面 Intent intent = new Intent(ImageSelecteActivity.this, ImagePreviewActivity.class); //把选中的图片集合传入预览界面 intent.putStringArrayListExtra("pic", listSelectedPath); startActivity(intent); break; case R.id.tv_allPic://选择图片目录 if (mPopupWindow == null) { //把目录列表的集合传入显示 mPopupWindow = new GalleryPopupWindow(this, list); mPopupWindow.setOnItemClickListener(new GalleryPopupWindow.OnItemClickListener() { @Override public void onItemClick(String fileName) { //切换了目录。清除之前的选择的信息 setButtonDisable(); listPath.clear(); listSelectedPath.clear(); //把当前选择的目录内图片的路径放入listPath，更新界面 listPath.addAll(mGroupMap.get(fileName)); adapter.update(listPath); mTextViewAllPic.setText(fileName); } }); } mPopupWindow.showAtLocation(mRecyclerView, Gravity.BOTTOM, 0, dp2px(50, ImageSelecteActivity.this)); break; case R.id.bt_confirm://确定 for (int i = 0; i < listSelectedPath.size(); i++) { //这里可通过Glide把它转为Bitmap Glide.with(this).load("file://" + listSelectedPath.get(i)).asBitmap().into(new SimpleTarget<Bitmap>() { @Override public void onResourceReady(Bitmap resource, GlideAnimation<? super Bitmap> glideAnimation) { Log.i(TAG, "onResourceReady: " + resource); } }); } break; } } /** * dp转px */ public static int dp2px(int dp, Context context) { return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, context.getResources().getDisplayMetrics()); } //选择图片变化的监听 private ImageSelectAdapter.OnCheckedChangedListener onCheckedChangedListener = new ImageSelectAdapter.OnCheckedChangedListener() { @Override public void onChanged(boolean isChecked, String path, CheckBox cb, int position) { if (isChecked) {//选中 if (listSelectedPath.size() == 9) { Toast.makeText(ImageSelecteActivity.this, "最多选择9张图片", Toast.LENGTH_SHORT).show(); //把点击变为checked的图片变为没有checked cb.setChecked(false); adapter.setCheckedBoxFalse(position); return; } //选中的图片路径加入集合 listSelectedPath.add(path); } else {//取消选中 //从集合中移除 if (listSelectedPath.contains(path)) listSelectedPath.remove(path); } //假设没有选中的button不可点击 if (listSelectedPath.size() == 0) { setButtonDisable(); } else { setButtonEnable(); } } }; //选中图片时的button状态 private void setButtonEnable() { mButtonConfirm.setBackgroundResource(R.drawable.selector_bt); mButtonConfirm.setTextColor(Color.parseColor("#ffffff")); mButtonConfirm.setEnabled(true); mTextViewPreview.setEnabled(true); mTextViewPreview.setTextColor(getResources().getColor(R.color.colorAccent)); mButtonConfirm.setText("确定" + listSelectedPath.size() + "/9"); } //没有选择时button状态 private void setButtonDisable() { mButtonConfirm.setBackgroundResource(R.drawable.shape_disable); mButtonConfirm.setTextColor(Color.parseColor("#676767")); mButtonConfirm.setEnabled(false); mTextViewPreview.setEnabled(false); mTextViewPreview.setTextColor(Color.parseColor("#BEBFBF")); mButtonConfirm.setText("确定"); } /** * 利用ContentProvider扫描手机中的图片。此方法在执行在子线程中 */ private void getImages() { new Thread(new Runnable() { @Override public void run() { Uri mImageUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI; ContentResolver mContentResolver = ImageSelecteActivity.this.getContentResolver(); //仅仅查询jpeg和png的图片 // Cursor mCursor = mContentResolver.query(mImageUri, null, // MediaStore.Images.Media.MIME_TYPE + "=? or " // + MediaStore.Images.Media.MIME_TYPE + "=? or " + MediaStore.Images.Media.MIME_TYPE + "=?", // new String[]{"image/jpeg", "image/png", "image/jpg"}, MediaStore.Images.Media.DATE_MODIFIED); Cursor mCursor = mContentResolver.query(mImageUri, null, null, null, MediaStore.Images.Media.DATE_MODIFIED); if (mCursor == null) { return; } //存放全部图片的路径 List<String> listAllPic = new ArrayList<String>(); while (mCursor.moveToNext()) { //获取图片的路径 String path = mCursor.getString(mCursor .getColumnIndex(MediaStore.Images.Media.DATA)); //获取该图片的父路径名 String parentName = new File(path).getParentFile().getName(); listAllPic.add(path); //依据父路径名将图片放入到mGruopMap中 if (!mGroupMap.containsKey(parentName)) { List<String> chileList = new ArrayList<String>(); chileList.add(path); mGroupMap.put(parentName, chileList); } else { mGroupMap.get(parentName).add(path); } } //加入全部图片 mGroupMap.put("全部图片", listAllPic); //通知Handler扫描图片完毕 mHandler.sendEmptyMessage(0); mCursor.close(); } }).start(); } //获取相冊目录列表 private void getGalleryList() { Iterator<Map.Entry<String, List<String>>> iterator = mGroupMap.entrySet().iterator(); while (iterator.hasNext()) { Map.Entry<String, List<String>> next = iterator.next(); ImageBean imageBean = new ImageBean(); imageBean.setFileName(next.getKey()); imageBean.setFirstPicPath(next.getValue().get(0)); imageBean.setCount(next.getValue().size()); if (next.getKey().equals("全部图片")) list.add(0, imageBean); else list.add(imageBean); } } }

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public class ImageSelecteActivity extends AppCompatActivity {
private static final String TAG = "lzy";
@BindView(R.id.ib_back)
ImageButton mButtonBack;
@BindView(R.id.tv_preview)
TextView mTextViewPreview;
@BindView(R.id.rv)
RecyclerView mRecyclerView;
@BindView(R.id.tv_allPic)
TextView mTextViewAllPic;
@BindView(R.id.bt_confirm)
Button mButtonConfirm;
private GalleryPopupWindow mPopupWindow;
//存储每一个目录下的图片路径,key是文件名称
private Map<String, List<String>> mGroupMap = new HashMap<>();
private List<ImageBean> list = new ArrayList<>();
//当前目录显示的图片路径
private List<String> listPath = new ArrayList<>();
//所选择的图片路径集合
private ArrayList<String> listSelectedPath = new ArrayList<>();
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
//扫描完毕后
getGalleryList();
listPath.clear();
listPath.addAll(mGroupMap.get("全部图片"));
adapter.update(listPath);
if (mPopupWindow != null)
mPopupWindow.notifyDataChanged();
}
};
private ImageSelectAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_image_selecte);
ButterKnife.bind(this);
init();
}
private void init() {
getImages();
mRecyclerView.setLayoutManager(new GridLayoutManager(ImageSelecteActivity.this, 3));
adapter = new ImageSelectAdapter(this, listPath);
mRecyclerView.setAdapter(adapter);
adapter.setOnCheckedChangedListener(onCheckedChangedListener);
}
@OnClick({R.id.ib_back, R.id.tv_preview, R.id.tv_allPic, R.id.bt_confirm})
public void onClick(View view) {
switch (view.getId()) {
case R.id.ib_back:
finish();
break;
case R.id.tv_preview://跳转预览界面
Intent intent = new Intent(ImageSelecteActivity.this, ImagePreviewActivity.class);
//把选中的图片集合传入预览界面
intent.putStringArrayListExtra("pic", listSelectedPath);
startActivity(intent);
break;
case R.id.tv_allPic://选择图片目录
if (mPopupWindow == null) {
//把目录列表的集合传入显示
mPopupWindow = new GalleryPopupWindow(this, list);
mPopupWindow.setOnItemClickListener(new GalleryPopupWindow.OnItemClickListener() {
@Override
public void onItemClick(String fileName) {
//切换了目录。清除之前的选择的信息
setButtonDisable();
listPath.clear();
listSelectedPath.clear();
//把当前选择的目录内图片的路径放入listPath，更新界面
listPath.addAll(mGroupMap.get(fileName));
adapter.update(listPath);
mTextViewAllPic.setText(fileName);
}
});
}
mPopupWindow.showAtLocation(mRecyclerView, Gravity.BOTTOM, 0, dp2px(50, ImageSelecteActivity.this));
break;
case R.id.bt_confirm://确定
for (int i = 0; i < listSelectedPath.size(); i++) {
//这里可通过Glide把它转为Bitmap
Glide.with(this).load("file://" + listSelectedPath.get(i)).asBitmap().into(new SimpleTarget<Bitmap>() {
@Override
public void onResourceReady(Bitmap resource, GlideAnimation<? super Bitmap> glideAnimation) {
Log.i(TAG, "onResourceReady: " + resource);
}
});
}
break;
}
}
/**
* dp转px
*/
public static int dp2px(int dp, Context context) {
return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp,
context.getResources().getDisplayMetrics());
}
//选择图片变化的监听
private ImageSelectAdapter.OnCheckedChangedListener onCheckedChangedListener = new ImageSelectAdapter.OnCheckedChangedListener() {
@Override
public void onChanged(boolean isChecked, String path, CheckBox cb, int position) {
if (isChecked) {//选中
if (listSelectedPath.size() == 9) {
Toast.makeText(ImageSelecteActivity.this, "最多选择9张图片", Toast.LENGTH_SHORT).show();
//把点击变为checked的图片变为没有checked
cb.setChecked(false);
adapter.setCheckedBoxFalse(position);
return;
}
//选中的图片路径加入集合
listSelectedPath.add(path);
} else {//取消选中
//从集合中移除
if (listSelectedPath.contains(path))
listSelectedPath.remove(path);
}
//假设没有选中的button不可点击
if (listSelectedPath.size() == 0) {
setButtonDisable();
} else {
setButtonEnable();
}
}
};
//选中图片时的button状态
private void setButtonEnable() {
mButtonConfirm.setBackgroundResource(R.drawable.selector_bt);
mButtonConfirm.setTextColor(Color.parseColor("#ffffff"));
mButtonConfirm.setEnabled(true);
mTextViewPreview.setEnabled(true);
mTextViewPreview.setTextColor(getResources().getColor(R.color.colorAccent));
mButtonConfirm.setText("确定" + listSelectedPath.size() + "/9");
}
//没有选择时button状态
private void setButtonDisable() {
mButtonConfirm.setBackgroundResource(R.drawable.shape_disable);
mButtonConfirm.setTextColor(Color.parseColor("#676767"));
mButtonConfirm.setEnabled(false);
mTextViewPreview.setEnabled(false);
mTextViewPreview.setTextColor(Color.parseColor("#BEBFBF"));
mButtonConfirm.setText("确定");
}
/**
* 利用ContentProvider扫描手机中的图片。此方法在执行在子线程中
*/
private void getImages() {
new Thread(new Runnable() {
@Override
public void run() {
Uri mImageUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
ContentResolver mContentResolver = ImageSelecteActivity.this.getContentResolver();
//仅仅查询jpeg和png的图片
//
Cursor mCursor = mContentResolver.query(mImageUri, null,
//
MediaStore.Images.Media.MIME_TYPE + "=? or "
//
+ MediaStore.Images.Media.MIME_TYPE + "=? or " + MediaStore.Images.Media.MIME_TYPE + "=?",
//
new String[]{"image/jpeg", "image/png", "image/jpg"}, MediaStore.Images.Media.DATE_MODIFIED);
Cursor mCursor = mContentResolver.query(mImageUri, null, null, null,
MediaStore.Images.Media.DATE_MODIFIED);
if (mCursor == null) {
return;
}
//存放全部图片的路径
List<String> listAllPic = new ArrayList<String>();
while (mCursor.moveToNext()) {
//获取图片的路径
String path = mCursor.getString(mCursor
.getColumnIndex(MediaStore.Images.Media.DATA));
//获取该图片的父路径名
String parentName = new File(path).getParentFile().getName();
listAllPic.add(path);
//依据父路径名将图片放入到mGruopMap中
if (!mGroupMap.containsKey(parentName)) {
List<String> chileList = new ArrayList<String>();
chileList.add(path);
mGroupMap.put(parentName, chileList);
} else {
mGroupMap.get(parentName).add(path);
}
}
//加入全部图片
mGroupMap.put("全部图片", listAllPic);
//通知Handler扫描图片完毕
mHandler.sendEmptyMessage(0);
mCursor.close();
}
}).start();
}
//获取相冊目录列表
private void getGalleryList() {
Iterator<Map.Entry<String, List<String>>> iterator = mGroupMap.entrySet().iterator();
while (iterator.hasNext()) {
Map.Entry<String, List<String>> next = iterator.next();
ImageBean imageBean = new ImageBean();
imageBean.setFileName(next.getKey());
imageBean.setFirstPicPath(next.getValue().get(0));
imageBean.setCount(next.getValue().size());
if (next.getKey().equals("全部图片"))
list.add(0, imageBean);
else
list.add(imageBean);
}
}
}

·mGroupMap：这个是以目录名为key，目录内的图片路径集合为value，也就是依照目录来分别存储了全部图片的路径。

·listPath：保存的是当前显示在界面上的目录内的图片路径集合

·listSelectedPath：保存用户选中的图片路径

·list：保存的是ImageBean的集合。ImageBean保存了目录名、里面首张图片的路径以及里面所包括图片的数量，当切换目录时用于显示

·getImages()：这种方法就是用来扫描手机里图片并保存的，这是在子线程中执行的，显示这可能是一个耗时的任务。通过ContentProvider获取到一个包括全部图片的Cursor，然后遍历这个Cursor把所需的数据就保存在mGroupMap里面，最后利用Handler通知界面更新。
·getGalleryList()：这种方法就是mGroupMap里面的数据来给list赋值，也就是产生一个现实目录列表所需的数据集合。

·GalleryPopupWindow也就是我们用于显示文件列表的，在67--84行就是一些GalleryPopupWindow的设置，调用showAtLocation方法把PopupWindow显示在距离底部50dp的位置，并设置了点击的回调，当切换了一个目录后要做的相关操作就在这里进行。GalleryPopupWindow再待会再详细看看

接下来再看看中间RecyclerView的Adapter

复制代码public class ImageSelectAdapter extends RecyclerView.Adapter<ImageSelectAdapter.NViewHolder> { private Context context; private List<String> list = new ArrayList<>(); private OnCheckedChangedListener onCheckedChangedListener; private List<Boolean> listChecked = new ArrayList<>(); public ImageSelectAdapter(Context context, List<String> list) { this.context = context; this.list.addAll(list); setListCheched(list); } public void update(List<String> list) { this.list.clear(); this.list.addAll(list); setListCheched(list); notifyDataSetChanged(); } /** * 设置listChecked的初始值 * * @param list */ private void setListCheched(List<String> list) { listChecked.clear(); for (int i = 0; i < list.size(); i++) { listChecked.add(false); } } //当点击超过了九张图片，再点击的设置为false public void setCheckedBoxFalse(int pos) { listChecked.set(pos, false); } public interface OnCheckedChangedListener { /** * @param isChecked 是否选中 * @param path 点击的图片路径 * @param cb 点击的CheckBox * @param pos 点击的位置 */ void onChanged(boolean isChecked, String path, CheckBox cb, int pos); } public void setOnCheckedChangedListener(OnCheckedChangedListener onCheckedChangedListener) { this.onCheckedChangedListener = onCheckedChangedListener; } @Override public NViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { return new NViewHolder(LayoutInflater.from(context).inflate(R.layout.item_image_select, parent, false)); } @Override public void onBindViewHolder(final NViewHolder holder, final int position) { Glide.with(context).load("file://" + list.get(position)).into(holder.iv); holder.cb.setChecked(listChecked.get(position)); holder.itemView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { holder.cb.setChecked(!holder.cb.isChecked()); if (holder.cb.isChecked()) { listChecked.set(position, true); } else { listChecked.set(position, false); } if (onCheckedChangedListener != null) { onCheckedChangedListener.onChanged(holder.cb.isChecked(), list.get(position), holder.cb, position); } } }); } @Override public int getItemCount() { return list.size(); } public class NViewHolder extends RecyclerView.ViewHolder { @BindView(R.id.iv_itemImageSelect) ImageView iv; @BindView(R.id.cb_itemImageSelect) CheckBox cb; public NViewHolder(View itemView) { super(itemView); ButterKnife.bind(this, itemView); } } }

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public class ImageSelectAdapter extends RecyclerView.Adapter<ImageSelectAdapter.NViewHolder> {
private Context context;
private List<String> list = new ArrayList<>();
private OnCheckedChangedListener onCheckedChangedListener;
private List<Boolean> listChecked = new ArrayList<>();
public ImageSelectAdapter(Context context, List<String> list) {
this.context = context;
this.list.addAll(list);
setListCheched(list);
}
public void update(List<String> list) {
this.list.clear();
this.list.addAll(list);
setListCheched(list);
notifyDataSetChanged();
}
/**
* 设置listChecked的初始值
*
* @param list
*/
private void setListCheched(List<String> list) {
listChecked.clear();
for (int i = 0; i < list.size(); i++) {
listChecked.add(false);
}
}
//当点击超过了九张图片，再点击的设置为false
public void setCheckedBoxFalse(int pos) {
listChecked.set(pos, false);
}
public interface OnCheckedChangedListener {
/**
* @param isChecked 是否选中
* @param path
点击的图片路径
* @param cb
点击的CheckBox
* @param pos
点击的位置
*/
void onChanged(boolean isChecked, String path, CheckBox cb, int pos);
}
public void setOnCheckedChangedListener(OnCheckedChangedListener onCheckedChangedListener) {
this.onCheckedChangedListener = onCheckedChangedListener;
}
@Override
public NViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
return new NViewHolder(LayoutInflater.from(context).inflate(R.layout.item_image_select, parent, false));
}
@Override
public void onBindViewHolder(final NViewHolder holder, final int position) {
Glide.with(context).load("file://" + list.get(position)).into(holder.iv);
holder.cb.setChecked(listChecked.get(position));
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
holder.cb.setChecked(!holder.cb.isChecked());
if (holder.cb.isChecked()) {
listChecked.set(position, true);
} else {
listChecked.set(position, false);
}
if (onCheckedChangedListener != null) {
onCheckedChangedListener.onChanged(holder.cb.isChecked(), list.get(position), holder.cb, position);
}
}
});
}
@Override
public int getItemCount() {
return list.size();
}
public class NViewHolder extends RecyclerView.ViewHolder {
@BindView(R.id.iv_itemImageSelect)
ImageView iv;
@BindView(R.id.cb_itemImageSelect)
CheckBox cb;
public NViewHolder(View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
}
}
}

这里Item的布局文件就是一个ImageView加一个CheckBox。依据选中状态改变CheckBox的状态，这里就不贴出来了。

·listChecked：这个集合是用来存储每一个位置是否Check的，假设在onBindViewHolder里面不设置CheckBox的状态的话，由于复用问题会出问题，所以想出了用一个集合来保存它们状态的方法，不知道大家有没有其它更好的方法。

·OnCheckedChangedListener：向外暴露的接口，把点击的位置等參数都传到Activity中去。

·update()：这种方法用来更新界面的，没有採用直接调notifyDataSetChanged方法是由于，假设数据的数量变化了那么listChecked的数量也要发生变化才行这样才干相应。所以写了这种方法。

再接着看看GalleryPopupWindow

复制代码/** * Created by lzy on 2017/2/8. */ public class GalleryPopupWindow extends PopupWindow { private static final String TAG = "lzy"; RecyclerView mRecyclerView; private Activity activity; private GalleryPopupWindow.OnItemClickListener onItemClickListener; private List<ImageBean> list; private GalleryAdapter adapter; public GalleryPopupWindow(Activity context, List<ImageBean> list) { super(context); this.activity = context; this.list = list; LayoutInflater inflater = (LayoutInflater) context .getSystemService(Context.LAYOUT_INFLATER_SERVICE); View contentView = inflater.inflate(R.layout.popu_gallery, null); initView(contentView); int h = context.getWindowManager().getDefaultDisplay().getHeight(); int w = context.getWindowManager().getDefaultDisplay().getWidth(); this.setContentView(contentView); this.setWidth(w); this.setHeight(ImageSelecteActivity.dp2px(350, context)); this.setFocusable(false); this.setOutsideTouchable(true); this.update(); setBackgroundDrawable(new ColorDrawable(000000000)); } public void notifyDataChanged() { adapter.notifyDataSetChanged(); } private void initView(View contentView) { mRecyclerView = (RecyclerView) contentView.findViewById(R.id.rv_gallery); mRecyclerView.setLayoutManager(new LinearLayoutManager(activity)); adapter = new GalleryAdapter(list, activity); adapter.setOnItemClickListener(new GalleryAdapter.OnItemClickListener() { @Override public void onItemClick(String fileName) { if (onItemClickListener != null) { onItemClickListener.onItemClick(fileName); dismiss(); } } }); mRecyclerView.setAdapter(adapter); } //暴露点击的接口 public interface OnItemClickListener { /** * @param keyValue */ void onItemClick(String keyValue); } public void setOnItemClickListener(OnItemClickListener onItemClickListener) { this.onItemClickListener = onItemClickListener; } }

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/**
* Created by lzy on 2017/2/8.
*/
public class GalleryPopupWindow extends PopupWindow {
private static final String TAG = "lzy";
RecyclerView mRecyclerView;
private Activity activity;
private GalleryPopupWindow.OnItemClickListener onItemClickListener;
private List<ImageBean> list;
private GalleryAdapter adapter;
public GalleryPopupWindow(Activity context, List<ImageBean> list) {
super(context);
this.activity = context;
this.list = list;
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View contentView = inflater.inflate(R.layout.popu_gallery, null);
initView(contentView);
int h = context.getWindowManager().getDefaultDisplay().getHeight();
int w = context.getWindowManager().getDefaultDisplay().getWidth();
this.setContentView(contentView);
this.setWidth(w);
this.setHeight(ImageSelecteActivity.dp2px(350, context));
this.setFocusable(false);
this.setOutsideTouchable(true);
this.update();
setBackgroundDrawable(new ColorDrawable(000000000));
}
public void notifyDataChanged() {
adapter.notifyDataSetChanged();
}
private void initView(View contentView) {
mRecyclerView = (RecyclerView) contentView.findViewById(R.id.rv_gallery);
mRecyclerView.setLayoutManager(new LinearLayoutManager(activity));
adapter = new GalleryAdapter(list, activity);
adapter.setOnItemClickListener(new GalleryAdapter.OnItemClickListener() {
@Override
public void onItemClick(String fileName) {
if (onItemClickListener != null) {
onItemClickListener.onItemClick(fileName);
dismiss();
}
}
});
mRecyclerView.setAdapter(adapter);
}
//暴露点击的接口
public interface OnItemClickListener {
/**
* @param keyValue
*/
void onItemClick(String keyValue);
}
public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
this.onItemClickListener = onItemClickListener;
}
}

这个PopupWindow的布局文件就是一个RecyclerView，所以这里面也没什么。也就是设置RecyclerView。然后向外暴露一个点击的接口，用于Activity接收是点击了哪个目录，所以接口參数也就是目录名，再看看这个PopupWindow的Adapter

复制代码/** * Created by lzy on 2017/2/8. */ public class GalleryAdapter extends RecyclerView.Adapter<GalleryAdapter.NViewHolder> { private Context context; private List<ImageBean> list; private OnItemClickListener onItemClickListener; //用于记录是选中的哪一个目录 private int selectedPos; public GalleryAdapter(List<ImageBean> list, Context context) { this.list = list; this.context = context; } public interface OnItemClickListener { void onItemClick(String fileName); } public void setOnItemClickListener(OnItemClickListener onItemClickListener) { this.onItemClickListener = onItemClickListener; } @Override public NViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { return new NViewHolder(LayoutInflater.from(context).inflate(R.layout.item_gallery, parent, false)); } @Override public void onBindViewHolder(NViewHolder holder, final int position) { holder.itemView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { selectedPos = position; notifyDataSetChanged(); if (onItemClickListener != null) { onItemClickListener.onItemClick(list.get(position).getFileName()); } } }); if (position == selectedPos) { holder.ivCheck.setVisibility(View.VISIBLE); } else { holder.ivCheck.setVisibility(View.GONE); } holder.tvCount.setText(list.get(position).getCount() + "张"); holder.tvName.setText(list.get(position).getFileName()); Glide.with(context).load("file://" + list.get(position).getFirstPicPath()).into(holder.iv); } @Override public int getItemCount() { return list.size(); } public class NViewHolder extends RecyclerView.ViewHolder { @BindView(R.id.iv_itemGallery) ImageView iv; @BindView(R.id.tv_itemGallery_name) TextView tvName; @BindView(R.id.tv_itemGallery_count) TextView tvCount; @BindView(R.id.iv_itemGallery_check) ImageView ivCheck; public NViewHolder(View itemView) { super(itemView); ButterKnife.bind(this, itemView); } } }

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/**
* Created by lzy on 2017/2/8.
*/
public class GalleryAdapter extends RecyclerView.Adapter<GalleryAdapter.NViewHolder> {
private Context context;
private List<ImageBean> list;
private OnItemClickListener onItemClickListener;
//用于记录是选中的哪一个目录
private int selectedPos;
public GalleryAdapter(List<ImageBean> list, Context context) {
this.list = list;
this.context = context;
}
public interface OnItemClickListener {
void onItemClick(String fileName);
}
public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
this.onItemClickListener = onItemClickListener;
}
@Override
public NViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
return new NViewHolder(LayoutInflater.from(context).inflate(R.layout.item_gallery, parent, false));
}
@Override
public void onBindViewHolder(NViewHolder holder, final int position) {
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
selectedPos = position;
notifyDataSetChanged();
if (onItemClickListener != null) {
onItemClickListener.onItemClick(list.get(position).getFileName());
}
}
});
if (position == selectedPos) {
holder.ivCheck.setVisibility(View.VISIBLE);
} else {
holder.ivCheck.setVisibility(View.GONE);
}
holder.tvCount.setText(list.get(position).getCount() + "张");
holder.tvName.setText(list.get(position).getFileName());
Glide.with(context).load("file://" + list.get(position).getFirstPicPath()).into(holder.iv);
}
@Override
public int getItemCount() {
return list.size();
}
public class NViewHolder extends RecyclerView.ViewHolder {
@BindView(R.id.iv_itemGallery)
ImageView iv;
@BindView(R.id.tv_itemGallery_name)
TextView tvName;
@BindView(R.id.tv_itemGallery_count)
TextView tvCount;
@BindView(R.id.iv_itemGallery_check)
ImageView ivCheck;
public NViewHolder(View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
}
}
}

这里有个接口是把点击的文件名称传递给PopupWindow。然后再给Activity。selectedPos是用来记录选择的是哪一个目录。显示相应的CheckBox。

这里就几乎相同完毕了，感兴趣的能够下载Demo来看看。

再说一下，这里显示图片都是採用的Glide。使用也非常方便，我们获取的图片路径都是文件路径。假设要转化为Bitmap也能够直接调用Glide的方法就能够轻松实现，例如以下所看到的：

复制代码Glide.with(this).load("file://" + listSelectedPath.get(i)).asBitmap().into(new SimpleTarget<Bitmap>() { @Override public void onResourceReady(Bitmap resource, GlideAnimation<?

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Glide.with(this).load("file://" + listSelectedPath.get(i)).asBitmap().into(new SimpleTarget<Bitmap>() {
@Override
public void onResourceReady(Bitmap resource, GlideAnimation<?

super Bitmap> glideAnimation) { Log.i(TAG, "onResourceReady: " + resource); } });

当中找寻控件都没有使用findViewById，而是採用的ButterKnife。节约了大量的时间，顺便说说导入的方法

在app以下的build.gradle中加入以下：

复制代码apply plugin: 'com.neenbedankt.android-apt'

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apply plugin: 'com.neenbedankt.android-apt'

复制代码apt 'com.jakewharton:butterknife-compiler:8.1.0' compile 'com.github.bumptech.glide:glide:3.5.2'

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apt 'com.jakewharton:butterknife-compiler:8.1.0'
compile 'com.github.bumptech.glide:glide:3.5.2'

项目以下的build.gradle

复制代码 //加入apt插件 classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'

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 //加入apt插件
classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'

加入插件

File->Setting->Plugins  搜索zelezny。例如以下所看到的

当须要使用的时候。直接在光标移动到布局文件，点击Alt+Insert。选择Generate ButterKnife Injections

就出现例如以下界面，能够自己主动生成了

源代码地址：http://download.csdn.net/detail/lylodyf/9768761