AlertDialog的写法

 public void onItemClick(AdapterView<?> parent, View view, int position,long id) {
         AlertDialog.Builder builder = new AlertDialog.Builder(this);
         builder.setTitle("选项");
         builder.setItems(R.array.choice, new DialogInterface.OnClickListener() {
             @Override
             public void onClick(DialogInterface dialog, int which) {
                 switch(which) {
                 case 0:
                     break;
                 case 1:
                     break;
                 case 2:
                     break;
                 }

             }
         });
         builder.setNegativeButton("取消", null);
         builder.create().show();

     }

string.xml

 <?xml version="1.0" encoding="utf-8"?>
 <resources>

     <string name="app_name">AppExplorer</string>
     <string name="hello_world">Hello world!</string>
     <array name ="choice">
         <item name="start">启动程序</item>
         <item name="detail">详细信息</item>
         <item name="uninstall">卸载</item>
     </array>
 </resources>

效果：

 public void onItemClick(AdapterView<?> parent, View view, int position,long id) {
         final PackageInfo tempPkgInfo = showPackageInfos.get(position);
         AlertDialog.Builder builder = new AlertDialog.Builder(this);
         builder.setTitle("选项");
         builder.setItems(R.array.choice, new DialogInterface.OnClickListener() {
             @Override
             public void onClick(DialogInterface dialog, int which) {
                 switch(which) {
                 case 0:
                     String packageName = tempPkgInfo.packageName;
                     ActivityInfo[] activityInfo = tempPkgInfo.activities;
                     String activityName = activityInfo[0].name;
                     try {
                         Intent i = new Intent();
                         i.setComponent(new ComponentName(packageName, activityName));
                         startActivity(i);
                     } catch (Exception e) {
                         return;
                     }
                     break;
                 case 1:
                     showAppDetail(tempPkgInfo);
                     break;
                 case 2:
                     Uri packageUri = Uri.parse("package:" + tempPkgInfo.packageName);
                     Intent deleteIntent = new Intent();
                     deleteIntent.setAction(Intent.ACTION_DELETE);
                     deleteIntent.setData(packageUri);
                     startActivity(deleteIntent);
                     break;
                 }

             }

         });
         builder.setNegativeButton("取消", null);
         builder.create().show();

     }

passwordDialog = builder.create();此方法返回一个AlertDialog