Android应用开发中模拟按下HOME键的效果(实现代码)

public boolean onKeyDown(int keyCode, KeyEvent event) {  
    if (keyCode == KeyEvent.KEYCODE_BACK) {  
        Intent intent = new Intent(Intent.ACTION_MAIN);  
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);  
        intent.addCategory(Intent.CATEGORY_HOME);  
        startActivity(intent);  
        return true;  
    }  
    return super.onKeyDown(keyCode, event);  
}