[代码]Android 返回键返回上一级Activity

实现功能: 有两个Activity，一个为MainMenu，一个为PictureScribble，MainMenu进入PictureScribble后，在PictureScribble中单击返回键返回MainMenus.

public boolean OnKeyDown(int keyCode,KeyEvent event){   
        if (keyCode==KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {   
        	Intent myIntent;
    		myIntent = new Intent(PictureScribble.this, MainMenu.class);
    		startActivity(myIntent);
    		this.finish();   
        }      
        return false;   
     }