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{@Overrideprotected 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);}@Overridepublic 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();}}@Overridepublic 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(){@Overridepublic void onClick(DialogInterface dialogInterface, int which) {Toast.makeText(getApplicationContext(), "保存退出", Toast.LENGTH_SHORT).show();finish();}});builder.setNegativeButton("否", new DialogInterface.OnClickListener() {@Overridepublic 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(){@Overridepublic 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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