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"/>