Android自动折行TextView Group

  1 package com.test.testview;
  2
  3 import java.util.ArrayList;
  4
  5 import android.content.Context;
  6 import android.graphics.Color;
  7 import android.text.TextUtils;
  8 import android.util.AttributeSet;
  9 import android.view.View;
 10 import android.widget.LinearLayout;
 11 import android.widget.TextView;
 12
 13 import com.test.testview.R;
 14
 15 public class HotwordsViewgroup extends LinearLayout implements
 16         View.OnClickListener
 17 {
 18     private final static int VIEW_MARGIN_HORIZONTAL = 50;
 19     private final static int VIEW_MARGIN_VERTICAL = 20;
 20
 21     private HotwordsOnclickListener mHotwordsOnclickListener;
 22
 23     public static interface HotwordsOnclickListener
 24     {
 25         /**
 26          * 触发onclik回调，根据TextView.getText去做相关事情
 27          *
 28          * @param view
 29          */
 30         public void hotwordOnclick(TextView view);
 31     }
 32
 33     public HotwordsViewgroup(Context context, AttributeSet attrs)
 34     {
 35         super(context, attrs);
 36         init();
 37     }
 38
 39     public HotwordsViewgroup(Context context, AttributeSet attrs, int defStyle)
 40     {
 41         super(context, attrs, defStyle);
 42         init();
 43     }
 44
 45     public HotwordsViewgroup(Context context)
 46     {
 47         super(context);
 48         init();
 49     }
 50
 51     /**
 52      * 设置每个关键词点击事件监听
 53      *
 54      * @param listener
 55      */
 56     public void setHotwordOnclickListener(HotwordsOnclickListener listener) {
 57         mHotwordsOnclickListener = listener;
 58     }
 59
 60     private void init() {
 61         setOrientation(HORIZONTAL);
 62     }
 63
 64     public void setData(final ArrayList<String> list) {
 65         removeAllViews();
 66         if (list != null) {
 67             for (int i = 0; i < list.size(); i++) {
 68                 String content = list.get(i);
 69                 if (TextUtils.isEmpty(content)) {
 70                     continue;
 71                 }
 72                 TextView textview = new TextView(getContext());
 73                 textview.setTextColor(Color.WHITE);
 74                 textview.setBackgroundResource(R.drawable.hot_words_bg);
 75                 textview.setTextSize(18);
 76                 textview.setOnClickListener(this);
 77                 textview.setMinimumWidth(100);
 78                 textview.setSingleLine();
 79                 textview.setEllipsize(TextUtils.TruncateAt.END);
 80                 textview.setText(content);
 81                 LinearLayout.LayoutParams layoutparams = new LinearLayout.LayoutParams(
 82                         LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
 83                 addView(textview, layoutparams);
 84             }
 85         }
 86     }
 87
 88     /**
 89      * 重写onLayout,在layout每个元素之前，需要计算该元素是否需要折行到下一行显示
 90      */
 91     protected void onLayout(boolean changed, int l, int t, int r, int b) {
 92         int count = getChildCount();
 93         if (count == 0) {
 94             super.onLayout(changed, l, count, r, b);
 95             return;
 96         }
 97         int lengthX = 0;
 98         int lengthY = 0;
 99         for (int i = 0; i < count; i++) {
100             View child = getChildAt(i);
101             int width = child.getMeasuredWidth();
102             int height = child.getMeasuredHeight();
103             child.layout(lengthX, lengthY, lengthX + width, lengthY + height);
104             int right = lengthX + width + VIEW_MARGIN_HORIZONTAL;
105             int nextWidth = 0;
106             if (i < count - 1) {
107                 nextWidth = getChildAt(i + 1).getMeasuredWidth();
108             }
109             if (right + nextWidth > (r - l)) {
110                 lengthX = 0;
111                 lengthY += height + VIEW_MARGIN_VERTICAL;
112             } else {
113                 lengthX = right;
114             }
115         }
116     }
117
118     @Override
119     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
120         int count = getChildCount();
121         if (count == 0) {
122             super.onMeasure(widthMeasureSpec, heightMeasureSpec);
123             return;
124         }
125         int lengthX = 0;
126         int lengthY = 0;
127         int r = MeasureSpec.getSize(widthMeasureSpec);
128         // 定义子View的宽度最大不能超过r宽度
129         int childWidth = MeasureSpec.makeMeasureSpec(r, MeasureSpec.AT_MOST);
130         for (int i = 0; i < getChildCount(); i++) {
131             View child = getChildAt(i);
132             child.measure(childWidth, MeasureSpec.UNSPECIFIED);
133             int width = child.getMeasuredWidth();
134             int height = child.getMeasuredHeight();
135             int right = lengthX + width + VIEW_MARGIN_HORIZONTAL;
136             int nextWidth = 0;
137             // 非最后一个元素需要尝试计算一下能否放的下
138             if (i < count - 1) {
139                 nextWidth = getChildAt(i + 1).getMeasuredWidth();
140             } else {
141                 // 最后一个计算高度的时候要加最后一排的高度
142                 lengthY += height;
143             }
144             if (right + nextWidth > r) {
145                 // 如果放不下，换行
146                 lengthX = 0;
147                 lengthY += height + VIEW_MARGIN_VERTICAL;
148             } else {
149                 // 如果能放下，往后加
150                 lengthX = right;
151             }
152         }
153         setMeasuredDimension(
154                 widthMeasureSpec,
155                 MeasureSpec.makeMeasureSpec(lengthY,
156                         MeasureSpec.getMode(heightMeasureSpec)));
157     }
158
159     @Override
160     public void onClick(View view) {
161         if (mHotwordsOnclickListener != null) {
162             mHotwordsOnclickListener.hotwordOnclick((TextView) view);
163         }
164     }
165 }