移动编程 调试例子3-5

源代码

Mainactivity.java

我把源代码中的警告对话框改成警告进度条，设置setCancelable=true，可以直接关闭此窗口。

package com.example.administrator.myapplication;

import android.annotation.SuppressLint;
import android.app.AlertDialog.Builder;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.Toast;

//仅是用户登录，不包括用户注册
public class MainActivity extends AppCompatActivity {
    Button btn1,btn2;
    LinearLayout login;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn1=findViewById(R.id.btn1);
        btn2=findViewById(R.id.btn2);
        btn1.setOnClickListener(new mClick());
        btn2.setOnClickListener(new mClick());
    }

    private class mClick implements View.OnClickListener {
        //Builder为AlertDialog的内部类
        Builder dialog = new Builder(MainActivity.this);
        ProgressDialog progressdialog = new ProgressDialog(MainActivity.this);

        @SuppressLint("InflateParams")
        @Override
        public void onClick(View v) {
            if (v == btn1) {
                progressdialog.setTitle(getString(R.string.warning));
                progressdialog .setMessage(getString(R.string.message));
                progressdialog.setIcon(R.drawable.warning);
                progressdialog.setCancelable(true);
                progressdialog.show();
//                dialog.setTitle(getString(R.string.warning));
//                dialog.setIcon(R.drawable.warning);
//                dialog.setMessage(getString(R.string.message));
//                dialog.setPositiveButton("确定", new okClick());
//                //创建对象框
//                dialog.create();
//                dialog.show();
            }
            else if (v == btn2) {
                login = (LinearLayout) getLayoutInflater().inflate(R.layout.login, null);

                dialog.setTitle("用户登陆").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.login);
                //创建对象框
                dialog.create();
                dialog.show();
            }
        }
    }
//        class okClick implements DialogInterface.OnClickListener{
//            @Override
//            public void onClick(DialogInterface dialog, int which) {
//                //关闭对话框
//                dialog.cancel();
//            }
//        }
        //确定
        class loginClick implements DialogInterface.OnClickListener{
            EditText txt;
            @Override
            public void onClick(DialogInterface dialog, int which) {
                txt=login.findViewById(R.id.pdEdit);
                //取出编辑框的密码与'admin'比较
                if ((txt.getText().toString()).equals("admin")){
                    Toast.makeText(getApplicationContext(),"登陆成功",Toast.LENGTH_SHORT).show();
                }
                else {
                    Toast.makeText(getApplicationContext(),"密码错误",Toast.LENGTH_SHORT).show();
                }
                dialog.dismiss();
            }
        }
        //退出
        class exitClick implements DialogInterface.OnClickListener{
            @Override
            public void onClick(DialogInterface dialog, int which) {
                MainActivity.this.finish();
            }
        }
    }

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:gravity="center"
    android:orientation="vertical">
        <Button
            android:id="@+id/btn1"
            android:layout_height="wrap_content"
            android:layout_width="wrap_content"
            android:text="@string/btn1"
            android:textSize="25sp"
            />

        <Button
            android:id="@+id/btn2"
            android:layout_height="wrap_content"
            android:layout_width="wrap_content"
            android:text="@string/btn2"
            android:textSize="25sp"
/>
</LinearLayout>

string.xml

<resources>
    <string name="app_name">My Application</string>
    <string name="btn1">打开普通对话框</string>
    <string name="btn2">打开输入对话框</string>
    <string name="user">用户名</string>
    <string name="pd">密码</string>
    <string name="warning">警告</string>
    <string name="message">本项操作可能导致信息泄露</string>

</resources>

结果显示

打开普通对话框 

打开输入对话框

密码匹配，登陆成功！

密码不匹配，登陆失败！