AlertDialog使用实例

创建项目AlertDialogDemo如图

AlertDialogDemo.java文件代码如下：

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package zerone.AlertDialogDemo;   import android.app.Activity;   public class AlertDialogDemo extends Activity {      /** Called when the activity is first created. */      final int DIALOG_WELCOME = 1 ;      private Button btn_alert;      @Override      public void onCreate(Bundle savedInstanceState) {          super .onCreate(savedInstanceState);          setContentView(R.layout.main);          btn_alert=(Button)findViewById(R.id.btn_dialog);          btn_alert.setOnClickListener( new View.OnClickListener() {              @Override              public void onClick(View v) {                  showDialog(DIALOG_WELCOME); //调用onCreateDialog              }          });      }            @Override      protected Dialog onCreateDialog( int id, Bundle args) {          switch (id) {          case DIALOG_WELCOME:              return new AlertDialog.Builder(AlertDialogDemo. this )              .setTitle( "欢迎" ).setMessage( "欢迎使用本程序" )              .setIcon(android.R.drawable.ic_dialog_info)              .setPositiveButton( "确定" , new OnClickListener() {                  @Override                  public void onClick(DialogInterface dialog, int which) {                      Toast.makeText(AlertDialogDemo. this , "点击\"确定\"按钮后" , Toast.LENGTH_SHORT).show();                  }              }).create();          default :              return null ;          }      }       }

main.xml文件如下：

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<? xml version = "1.0" encoding = "utf-8" ?> < LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android"      android:orientation = "vertical"      android:layout_width = "fill_parent"      android:layout_height = "fill_parent"      > < TextView       android:layout_width = "fill_parent"      android:layout_height = "wrap_content"      android:text = "@string/app_title"      /> < Button     android:id = "@+id/btn_dialog"     android:layout_width = "fill_parent"     android:layout_height = "wrap_content"     android:text = "弹出" /> </ LinearLayout >

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运行实例效果截图：

 

Android2.2上测试通过