Question

android中多个activity怎么能双击back两次后退出程序?

Answer 1

Handler mHandler = new Handler() {

@Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
super.handleMessage(msg);
isExit = false;
}

};

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
exit();
return false;
} else {
return super.onKeyDown(keyCode, event);
}
}

public void exit(){
if (!isExit) {
isExit = true;
Toast.makeText(getApplicationContext(), "再按一次退出程序", Toast.LENGTH_SHORT).show();
mHandler.sendEmptyMessageDelayed(0, 2000);
} else {
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
startActivity(intent);
System.exit(0);
}
}