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Android消息对话框实例
按着书敲得(大神绕行)，敲多了就会了，哈哈哈！一起加油！main.xml
<?xml version="1.0" encoding="utf-8"?>login.xml
<?xml version="1.0" encoding="utf-8"?>main.java
package com.example.myapplication3; import android.app.Activity; import android.app.AlertDialog; import android.app.AlertDialog.Builder; import android.app.ProgressDialog; import android.content.DialogInterface; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.LinearLayout; import android.widget.Toast; public class MainActivity extends Activity { ProgressDialog mydialog; Button btn1,btn2; LinearLayout login; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); btn1=findViewById(R.id.button1); btn2=findViewById(R.id.button2); btn1.setOnClickListener(new mClick()); btn2.setOnClickListener(new mClick()); } class mClick implements OnClickListener{ Builder dialog=new AlertDialog.Builder(MainActivity.this); @Override public void onClick(View arg0){ if(arg0btn1){ // 设置对话框的标题，图标，提示内容，按钮操作 dialog.setTitle(“警告”); dialog.setIcon(R.drawable.icon1); dialog.setMessage(“本项操作可能导致信息泄露！”); dialog.setPositiveButton(“确定”,new okClick()); // 创建显和示对话框 dialog.create(); dialog.show(); } else if (arg0btn2){ // 从另外的布局关联组件 login=(LinearLayout)getLayoutInflater() .inflate(R.layout.login,null); dialog.setTitle(“用户登录”).setMessage(“请输入用户名和密码”) .setView(login); dialog.setPositiveButton(“确定”,new loginClick()); dialog.setNegativeButton(“退出”,new exitClick()); dialog.setIcon(R.drawable.icon2); dialog.create(); dialog.show(); } } } class okClick implements DialogInterface.OnClickListener{ @Override public void onClick(DialogInterface dialog, int which){ // 关闭对话框 dialog.cancel(); } } class loginClick implements DialogInterface.OnClickListener { EditText txt; @Override public void onClick (DialogInterface dialog,int which){ txt= login.findViewById(R.id.paswdEdit); if ((txt.getText().toString()).equals(“admin”)) Toast.makeText(getApplicationContext(), “登录成功”, Toast.LENGTH_SHORT).show(); else Toast.makeText(getApplicationContext(), “密码错误”,Toast.LENGTH_SHORT).show(); dialog.dismiss(); } } class exitClick implements DialogInterface.OnClickListener{ @Override public void onClick(DialogInterface dialog,int which){ MainActivity.this.finish(); } } }
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