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     @Override119     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     @Override160     public void onClick(View view) {161         if (mHotwordsOnclickListener != null) {162             mHotwordsOnclickListener.hotwordOnclick((TextView) view);163         }164     }165 }