activity just show a dialog

activity只显示dialog　　只显示dialog的activity

Activity_Just_Show_A_Dialog.java

public class Activity_Just_Show_A_Dialog extends Activity {
	private final static int PHONE = 1;
	AlertDialog.Builder builder;
	Dialog dialog;
	
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        setContentView(R.layout.main);	//can't omit this line
        
        //set this activity's window not be seen
        Window win = getWindow();
        win.setLayout(0, 0);
        
        showDialog(PHONE);
        dialog.setOnDismissListener(listenDialogDismissed);
    }
    
    @Override
    protected Dialog onCreateDialog(int id) {
    	// TODO Auto-generated method stub
    	switch(id) {
    	case PHONE:
    		builder = new AlertDialog.Builder(this);
        	builder.setTitle("this is a Dialog");
        	dialog = builder.create();
        	break;
        	
       default:
        	break;
    	}
    	
    	return dialog;
//    	return super.onCreateDialog(id);
    }
    
    public OnDismissListener listenDialogDismissed = new OnDismissListener() {
		
		@Override
		public void onDismiss(DialogInterface dialog) {
			// TODO Auto-generated method stub
			
			//end this activity, so it looks like there is no activity, just a dialog has showed
			finish();
		}
	};
}

 

main.xml

<?xml version="1.0" encoding="utf-8"?>
 <!-- android:visibility="invisible" -->
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    
    
 </LinearLayout>

 

 

AndroidManifest.xml

 

 

<?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.hua.Activity_with_dialog"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".Activity_Just_Show_A_Dialog"
                    android:theme="@android:style/Theme.Dialog"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>


 </manifest>