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();   }   }  }