Android按返回键弹出对话框退出应用程序

在当前的Activity中添加以下代码：

import android.app.Activity;import android.app.AlertDialog;import android.content.DialogInterface;import android.os.Bundle;import android.view.KeyEvent;public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    @Override    public boolean onKeyDown(int keyCode, KeyEvent event) {    switch (keyCode) {     case KeyEvent.KEYCODE_BACK:             AlertDialog.Builder builder = new AlertDialog.Builder(this);             builder.setIcon(R.drawable.ic_launcher)                     .setTitle("提示！")                     .setMessage("确认退出程序？")                     .setPositiveButton("确定", new DialogInterface.OnClickListener() {                         @Override                         public void onClick(DialogInterface dialog, int which) {                             finish();                         }                     })                     .setNegativeButton("取消", new DialogInterface.OnClickListener() {                         @Override                         public void onClick(DialogInterface dialog, int which) {                         }                     })                     .show();             break;    }    return false;    }}

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