评价标签类似淘宝评价效果功能实现

需求:默认显示两行标签内容,点击展开显示全部标签内容,点击收起显示两行内容

主要实现代码:

MainActivity代码

package it520view.com.labeldemo;

import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;

import java.util.ArrayList;

import butterknife.Bind;
import butterknife.ButterKnife;

public class MainActivity extends AppCompatActivity {


    @Bind(R.id.lfl_label)
    LabelFlowLayout mLflLabel;
    @Bind(R.id.tv_shrink)
    TextView mTvShrink;
    @Bind(R.id.ll_export)
    LinearLayout mLlExport;

    private ArrayList<String> mData;
    private boolean isExport;//判断展开收起的标志
    private LabelAdapter mLabelAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
        initData();
        initListener();
        mLabelAdapter = new LabelAdapter(this,mData);
        mLflLabel.setAdapter(mLabelAdapter);
    }


    private void initData() {
        mData = new ArrayList<String>();
        for (int i = 0; i < 7; i++) {
            mData.add("服务很周到,洗的很干净" + i);
        }        for (int i = 0; i < 13; i++) {
            mData.add("洗的很干净"+i);
        }
    }

    private void initListener() {
        mLlExport.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                isExport = !isExport;
                refreshLabel();
            }
        });
    }

    private void refreshLabel() {
        if (!isExport) {
            mLflLabel.setLimitLines(0);
            changeDrawbleWithString("收起", getResources().getDrawable(R.drawable.icon_d01));
        } else {
            mLflLabel.setLimitLines(2);
            changeDrawbleWithString("展开", getResources().getDrawable(R.drawable.icon_d02));
        }
        mLflLabel.postInvalidate();
    }
    private void changeDrawbleWithString(String str,Drawable drawable) {
        mTvShrink.setText(str);
        drawable.setBounds(0, 0, drawable.getMinimumWidth(), drawable.getMinimumHeight());
        mTvShrink.setCompoundDrawablesWithIntrinsicBounds(null, null, drawable, null);
    }
}

LabelFlowLayout代码

package it520view.com.labeldemo;

import android.content.Context;
import android.database.DataSetObserver;
import android.util.AttributeSet;
import android.util.SparseIntArray;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListAdapter;

/**
 *
 */
public class LabelFlowLayout extends AdapterView<ListAdapter> implements View.OnClickListener {
    private ListAdapter mAdapter;

    /**
     * 上下行间距
     */
    public int veticalSpace = 30;
    /**
     * Item间距
     */
    public int horSpace = 30;

    /**
     * 每一行有多少个view
     */
    private SparseIntArray mLineViews = new SparseIntArray();

    private AdapterDataSetObserver mDataSetObserver;

    /**
     * 一行的高度由最高的item决定
     */
    private int lineHeight;

    //限制行数
    private int mLimitLines = -1;

    private int curLines;

    public LabelFlowLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public ListAdapter getAdapter() {
        return mAdapter;
    }

    @Override
    public void setAdapter(ListAdapter adapter) {
        if (mAdapter != null && mDataSetObserver != null) {
            mAdapter.unregisterDataSetObserver(mDataSetObserver);
        }
        mAdapter = adapter;
        if (mAdapter != null) {
            mDataSetObserver = new AdapterDataSetObserver();
            mAdapter.registerDataSetObserver(mDataSetObserver);
            makeView();
        } else {
            removeAllViewsInLayout();
            invalidate();
        }
    }

    private void makeView() {
        removeAllViewsInLayout();
        requestLayout();
        int count = mAdapter.getCount();
        for (int i = 0; i < count; i++) {
            View child = mAdapter.getView(i, null, this);
            LayoutParams params = child.getLayoutParams();
            if (params == null)
                params = generateDefaultLayoutParams();
            addViewInLayout(child, i, params);
        }

    }

    /**
     * 设置显示行数,设置完成后会自动刷新
     * 如由限制改为不限制，设为0
     *
     * @param lines
     */
    public void setLimitLines(int lines) {
        this.mLimitLines = lines;
        requestLayout();
    }

    /**
     * 获取当前行数,注意第一次绘制前可能该数未被初始化
     * @return
     */
    public int getCurLines() {
        return curLines;
    }

    private class AdapterDataSetObserver extends DataSetObserver {

        @Override
        public void onChanged() {
            super.onChanged();
            makeView();
            requestLayout();
        }
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        int widthSize = MeasureSpec.getSize(widthMeasureSpec);
        int heightSize = MeasureSpec.getSize(heightMeasureSpec);
        int modeWidth = MeasureSpec.getMode(widthMeasureSpec);
        int modeHeight = MeasureSpec.getMode(heightMeasureSpec);

        int layoutWidth = 0;
        int layoutHeight = 0;

        int lineWidth = getPaddingLeft() + getPaddingRight();

        if (mAdapter == null)
            return;
        int count = getChildCount();
        mLineViews.clear();
        int lineCount = 0;
        int line = 0;
        for (int i = 0; i < count; i++) {
            View child = getChildAt(i);
            measureChild(child, widthMeasureSpec, heightMeasureSpec);
            lineHeight = Math.max(lineHeight, child.getMeasuredHeight());
            int childWidth = child.getMeasuredWidth();
            if (lineWidth + childWidth > widthSize) {
                mLineViews.put(line, lineCount);
                lineWidth -= horSpace;
                layoutWidth = Math.max(layoutWidth, lineWidth);
                line++;
                lineWidth = getPaddingLeft() + getPaddingRight();
                lineCount = 0;
                //限制行数
                if(mLimitLines > 0 && line == mLimitLines){
                    break;
                }
            }
            lineCount++;
            lineWidth += childWidth + horSpace;

            if (i == count - 1) {
                mLineViews.put(line, lineCount);
                lineWidth -= horSpace;
                layoutWidth = Math.max(layoutWidth, lineWidth);
                lineCount = 0;
            }
        }

        if (modeWidth == MeasureSpec.EXACTLY) {
            layoutWidth = widthSize;
        }

        int lines = mLineViews.size();
        curLines = lines;
        if (lines > 0) {
            if (modeHeight == MeasureSpec.EXACTLY) {
                layoutHeight = heightSize;
            } else {

                layoutHeight = getPaddingTop() + getPaddingBottom() + lines * lineHeight + (lines - 1) * veticalSpace;
            }
        }
        setMeasuredDimension(layoutWidth, layoutHeight);

    }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        int leftPos = 0;
        int topPos = 0;

        int lines = mLineViews.size();
        int lineCount;

        int position = 0;

        for (int i = 0; i < lines; i++) {
            lineCount = mLineViews.get(i);
            View child;

            topPos = getPaddingTop() + i * veticalSpace + i * lineHeight;
            leftPos = getPaddingLeft();

            for (int j = 0; j < lineCount; j++) {
                child = getChildAt(position);
                if (child == null)
                    return;
                position++;
                child.setOnClickListener(this);
                int childWidth = child.getMeasuredWidth();
                child.layout(leftPos, topPos, leftPos + childWidth, topPos + lineHeight);

                leftPos += childWidth + horSpace;
            }
        }

    }

    @Override
    public void onClick(View v) {
        int pos = indexOfChild(v);
        performItemClick(v, pos, 0);
    }

    @Override
    public void setSelection(int position) {
        // TODO Auto-generated method stub

    }

    @Override
    public View getSelectedView() {
        // TODO Auto-generated method stub
        return null;
    }

}

LabelAdapter 代码

package it520view.com.labeldemo;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import java.util.List;

public class LabelAdapter extends BaseAdapter {
    private LayoutInflater mInflater;
    private List<String> list;

    public LabelAdapter(Context context, List<String> list) {
        super();
        this.mInflater = LayoutInflater.from(context);
        this.list = list;
    }

    static class ViewHolder {
        TextView TextView;
    }

    @Override
    public int getCount() {
        return list.size();
    }

    @Override
    public Object getItem(int position) {
        return list.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder = null;
        if (convertView == null) {
            convertView = mInflater.inflate(R.layout.item_label, parent,false);
            holder = new ViewHolder();
            holder.TextView = (TextView) convertView.findViewById(R.id.name_tv);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }
        holder.TextView.setText(list.get(position));
        return convertView;
    }

}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:orientation="vertical">

    <it520view.com.labeldemo.LabelFlowLayout
        android:id="@+id/lfl_label"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#FFFFFF"
        android:padding="10dp"/>

    <LinearLayout
        android:id="@+id/ll_export"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:background="#FFFFFF"
        android:gravity="center"
        android:paddingBottom="10dp"
        android:paddingTop="10dp">

        <TextView
            android:id="@+id/tv_shrink"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:drawablePadding="3dp"
            android:text="展开"
            android:textColor="#000000"
            android:textSize="12sp"/>
    </LinearLayout>

</LinearLayout>

item_label.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/name_tv"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:background="@drawable/labelshape"
    android:gravity="center"
    android:layout_margin="3dp"
    android:lines="1"
    android:padding="8dp"
    android:textColor="@color/textColorforItemTitle"
    android:textSize="12dp"
    android:ellipsize="end"/>

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