Android 实现返回键退出弹出确认对话框

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实现效果：

实现代码：

package com.example.android12_zhangkai;import android.content.DialogInterface;import android.support.v7.app.AlertDialog;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.KeyEvent;import android.widget.Toast;public class MainActivity extends AppCompatActivity {    private long firstTime=0;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    @Override    public boolean onKeyDown(int keyCode, KeyEvent event) {        if (keyCode==KeyEvent.KEYCODE_BACK){            AlertDialog.Builder builder=new AlertDialog.Builder(this);            builder.setTitle("提示：");            builder.setMessage("您确定退出？");            //设置确定按钮            builder.setNegativeButton("确定", new DialogInterface.OnClickListener() {                @Override                public void onClick(DialogInterface dialog, int which) {                    finish();                }            });            //设置取消按钮            builder.setPositiveButton("容我再想想",null);            //显示提示框            builder.show();        }        return super.onKeyDown(keyCode, event);    }}

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