android 之Dialog对话框(简易版)

实际效果：
实例代码：
后台逻辑：
package com.example.tf.dialog_demo;import android.content.DialogInterface;import android.support.v7.app.AlertDialog;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Toast;public class MainActivity extends AppCompatActivity implements DialogInterface.OnClickListener{    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    public void simple(View view){        //实例化对话框的内部类Builder(构建器)对象        AlertDialog.Builder builder = new AlertDialog.Builder(this);        builder.setTitle("登录提示");        builder.setMessage("正在登录......");        builder.setIcon(R.mipmap.ic_launcher);        builder.setCancelable(false);        builder.setPositiveButton("保存", this);        builder.setNegativeButton("不保存",this);        builder.setNeutralButton("取消",this);    }    @Override    public void onClick(DialogInterface dialogInterface, int which) {        if(DialogInterface.BUTTON_POSITIVE==which){            Toast.makeText(getApplicationContext(),"用户点击了保存按钮",Toast.LENGTH_LONG).show();        }else if(DialogInterface.BUTTON_NEGATIVE==which){            Toast.makeText(getApplicationContext(),"用户点击了不保存按钮",Toast.LENGTH_LONG).show();        }else if (DialogInterface.BUTTON_NEUTRAL==which){            Toast.makeText(getApplicationContext(),"用户点击额取消按钮",Toast.LENGTH_LONG).show();        }    }    @Override    public void onBackPressed() {        //super.onBackPressed();        AlertDialog.Builder builder = new AlertDialog.Builder(this);        builder.setTitle("退出提示");        builder.setMessage("你确定要退出应用程序吗?");        builder.setPositiveButton("是",new DialogInterface.OnClickListener(){            @Override            public void onClick(DialogInterface dialogInterface, int which) {                Toast.makeText(getApplicationContext(), "保存退出", Toast.LENGTH_SHORT).show();                finish();            }        });        builder.setNegativeButton("否", new DialogInterface.OnClickListener() {            @Override            public void onClick(DialogInterface dialogInterface, int which) {                Toast.makeText(getApplicationContext(), "不保存退出", Toast.LENGTH_SHORT).show();                finish();            }        });        builder.setNegativeButton("取消",new DialogInterface.OnClickListener(){            @Override            public void onClick(DialogInterface dialogInterface, int i) {                Toast.makeText(getApplicationContext(), "返回应用程序", Toast.LENGTH_SHORT).show();            }        });            builder.create().show();        System.out.println("====onBackPressed====");    }}
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