Android UI控件之ListView实现圆角效果

package com.kiritor.corner_listview; 
 
 
import android.content.Context; 
import android.util.AttributeSet; 
import android.view.MotionEvent; 
import android.widget.AdapterView; 
import android.widget.ListView; 
 
/*** 
 * 自定义listview 
 * 
 * @author Kiritor 
 * 
 */ 
public class MyListView extends ListView { 
 public MyListView(Context context) { 
  super(context); 
 } 
 
 public MyListView(Context context, AttributeSet attrs) { 
  super(context, attrs); 
 } 
 
 /**** 
  * 拦截触摸事件 
  */ 
 @Override 
 public boolean onTouchEvent(MotionEvent ev) { 
  switch (ev.getAction()) { 
  case MotionEvent.ACTION_DOWN: 
   int x = (int) ev.getX(); 
   int y = (int) ev.getY(); 
   int itemnum = pointToPosition(x, y); 
   if (itemnum == AdapterView.INVALID_POSITION) 
    break; 
   else { 
    if (itemnum == 0) { 
     if (itemnum == (getAdapter().getCount() - 1)) { 
      // 只有一项数据，设置背景设置为圆角的 
      setSelector(R.drawable.list_round); 
     } else { 
      // 第一项，设置为上面为圆角的 
      setSelector(R.drawable.list_top_round); 
     } 
    } else if (itemnum == (getAdapter().getCount() - 1)) 
     // 最后一项，设置为下面为圆角的 
     setSelector(R.drawable.list_bottom_round); 
    else { 
     // 中间项，不用设置为圆角 
     setSelector(R.drawable.list_center_round); 
    } 
   } 
   break; 
  case MotionEvent.ACTION_UP: 
   break; 
  } 
  return super.onTouchEvent(ev); 
 } 
} 

package com.kiritor.corner_listview; 
 
import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.Map; 
 
 
 
import android.app.Activity; 
import android.os.Bundle; 
import android.view.View; 
import android.view.ViewGroup; 
import android.view.Window; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.ArrayAdapter; 
import android.widget.ListAdapter; 
import android.widget.ListView; 
import android.widget.SimpleAdapter; 
import android.widget.Toast; 
 
public class MainActivity extends Activity implements OnItemClickListener { 
 private MyListView listView_1, listView_2, listView_3; 
 private ArrayList<Map<String, String>> listData, listData2, listData3; 
 private SimpleAdapter adapter; 
 
 @Override 
 public void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
  requestWindowFeature(Window.FEATURE_NO_TITLE); 
  setContentView(R.layout.main); 
  listView_1 = (MyListView) findViewById(R.id.mylistview_1); 
  listView_2 = (MyListView) findViewById(R.id.mylistview_2); 
  listView_3 = (MyListView) findViewById(R.id.mylistview_3); 
 
  listView_1.setAdapter(getSimpleAdapter_1()); 
  listView_2.setAdapter(getSimpleAdapter_2()); 
  listView_3.setAdapter(getSimpleAdapter_3()); 
 
  listView_1.setOnItemClickListener(this); 
  listView_2.setOnItemClickListener(this); 
  listView_3.setOnItemClickListener(this); 
 
  setListViewHeightBasedOnChildren(listView_1); 
  setListViewHeightBasedOnChildren(listView_2); 
  setListViewHeightBasedOnChildren(listView_3); 
 } 
 
 /** 
  * 设置第一列数据 
  */ 
 private SimpleAdapter getSimpleAdapter_1() { 
  listData = new ArrayList<Map<String, String>>(); 
 
  Map<String, String> map = new HashMap<String, String>(); 
  map.put("text", "天气动画"); 
  listData.add(map); 
 
  map = new HashMap<String, String>(); 
  map.put("text", "通知栏天气"); 
  listData.add(map); 
 
  return new SimpleAdapter(MainActivity.this, listData, 
    R.layout.list_item, new String[] { "text" }, 
    new int[] { R.id.tv_list_item }); 
 
 } 
 
 /** 
  * 设置第二列数据 
  */ 
 private SimpleAdapter getSimpleAdapter_2() { 
  listData2 = new ArrayList<Map<String, String>>(); 
 
  Map<String, String> map = new HashMap<String, String>(); 
  map.put("text", "桌面插件"); 
  listData2.add(map); 
 
  map = new HashMap<String, String>(); 
  map.put("text", "绑定微博"); 
  listData2.add(map); 
 
  map = new HashMap<String, String>(); 
  map.put("text", "天气分享"); 
  listData2.add(map); 
 
  map = new HashMap<String, String>(); 
  map.put("text", "通知与提示"); 
  listData2.add(map); 
 
  map = new HashMap<String, String>(); 
  map.put("text", "定时播报"); 
  listData2.add(map); 
 
  return new SimpleAdapter(MainActivity.this, listData2, 
    R.layout.list_item, new String[] { "text" }, 
    new int[] { R.id.tv_list_item }); 
 
 } 
 
 /** 
  * 设置第三列数据 
  */ 
 private SimpleAdapter getSimpleAdapter_3() { 
  listData3 = new ArrayList<Map<String, String>>(); 
 
  Map<String, String> map = new HashMap<String, String>(); 
  map.put("text", "检查新版本"); 
  listData3.add(map); 
 
  map = new HashMap<String, String>(); 
  map.put("text", "发送建议"); 
  listData3.add(map); 
 
  map = new HashMap<String, String>(); 
  map.put("text", "帮助"); 
  listData3.add(map); 
 
  map = new HashMap<String, String>(); 
  map.put("text", "关于"); 
  listData3.add(map); 
 
  return new SimpleAdapter(MainActivity.this, listData3, 
    R.layout.list_item, new String[] { "text" }, 
    new int[] { R.id.tv_list_item }); 
 
 } 
 
 /*** 
  * 动态设置listview的高度 
  * 
  * @param listView 
  */ 
 public void setListViewHeightBasedOnChildren(ListView listView) { 
  ListAdapter listAdapter = listView.getAdapter(); 
  if (listAdapter == null) { 
   return; 
  } 
  int totalHeight = 0; 
  for (int i = 0; i < listAdapter.getCount(); i++) { 
   View listItem = listAdapter.getView(i, null, listView); 
   listItem.measure(0, 0); 
   totalHeight += listItem.getMeasuredHeight(); 
  } 
  ViewGroup.LayoutParams params = listView.getLayoutParams(); 
  params.height = totalHeight 
    + (listView.getDividerHeight() * (listAdapter.getCount() - 1)); 
  // params.height += 5;// if without this statement,the listview will be 
  // a 
  // little short 
  // listView.getDividerHeight()获取子项间分隔符占用的高度 
  // params.height最后得到整个ListView完整显示需要的高度 
  listView.setLayoutParams(params); 
 } 
 
 @Override 
 public void onItemClick(AdapterView<?> parent, View view, int position, 
   long id) { 
   
  if (parent == listView_1) { 
   Map<String, String> map = listData.get(position); 
   Toast.makeText(MainActivity.this, map.get("text"), 1).show(); 
  } else if (parent == listView_2) { 
   Map<String, String> map = listData2.get(position); 
   Toast.makeText(MainActivity.this, map.get("text"), 1).show(); 
  } else if (parent == listView_3) { 
   Map<String, String> map = listData3.get(position); 
   Toast.makeText(MainActivity.this, map.get("text"), 1).show(); 
  } 
 
 } 
 
}