再按一次退出程序

注意：本人亲测，非常好用可靠

package com.example.group;

import com.example.zmmap.R;

import android.app.Activity;

import android.os.Bundle;

import android.view.KeyEvent;

import android.widget.Toast;

public class TestActivity extends Activity {

private long exitTime = 0;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.test_group);

}

@Override

public boolean onKeyDown(int keyCode, KeyEvent event) {

if (keyCode == KeyEvent.KEYCODE_BACK

&& event.getAction() == KeyEvent.ACTION_DOWN) {

if ((System.currentTimeMillis() - exitTime) > 2000) {

Toast.makeText(getApplicationContext(), "再按一次退出程序",

Toast.LENGTH_SHORT).show();

exitTime = System.currentTimeMillis();

} else {

finish();

System.exit(0);

}

return true;

}

return super.onKeyDown(keyCode, event);

}

}