从你的应用程序返回桌面

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); 

this.startActivity(intent);            

return true;

} else {

return super.onKeyDown(keyCode, event);

}

}