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);
}


}