AndroidStudio案例：消息对话框应用示例

今天药忘吃喽~ 2022-02-27 18:56 258阅读 0赞

### 一、内容 ###

设计两种形式的对话框程序，一种是发出提示信息的普通对话框，另一种是用户登录对话框。

### 二、实现 ###

1.主界面 activity\_main.xml

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".MainActivity"
        android:orientation="vertical">
    
        <Button
            android:id="@+id/btn1"
            android:layout_width="143dp"
            android:layout_height="wrap_content"
            android:text="打开普通对话框"
            android:textSize="25px" />
        <Button
            android:id="@+id/btn2"
            android:layout_width="144dp"
            android:layout_height="wrap_content"
            android:text="打开输入对话框"
            android:textSize="25px" />
    
    </LinearLayout>

图示：![20190328112821930.png][]

2.登录对话框的界面布局文件 login.xml

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical">
    
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="用户名:"
            android:id="@+id/user"
            android:textSize="18sp" />
    
        <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/editText" />
    
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="密码："
            android:id="@+id/textView"
            android:textSize="18sp" />
    
        <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/paswdEdit" />
    
    </LinearLayout>

图示：![20190328113048304.png][]，其他组件通过主控制程序 MainActivity.java添加。

3.主控制程序 MainActivity.java

先在res-drawable文件夹里放入需要的图片

![20190328113411466.png][]

package com.example.asus.text3_5;
    
    import android.app.Activity;
    import android.app.AlertDialog;
    import android.app.ProgressDialog;
    import android.content.DialogInterface;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.view.View;
    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
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            btn1=(Button)findViewById(R.id.btn1);
            btn2=(Button)findViewById(R.id.btn2);
            btn1.setOnClickListener(new mClick());
            btn2.setOnClickListener(new mClick());
        }
        class mClick implements View.OnClickListener
        {
            AlertDialog.Builder dialog=new AlertDialog.Builder(MainActivity.this);
            @Override
            public void onClick(View arg0)
            {
                if(arg0 == btn1)
                {
                    //设置对话框的标题
                    dialog.setTitle("警告");
                    //设置对话框的图标
                    dialog.setIcon(R.drawable.timg);
                    //设置对话框显示的内容
                    dialog.setMessage("本项操作可能导致信息泄漏！");
                    //设置对话框的“确定”按钮
                    dialog.setPositiveButton("确定", new okClick());
                    //创建对象框
                    dialog.create();
                    //显示对象框
                    dialog.show();
                }
                else  if(arg0 == btn2)
                {
                    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.qq);
                    dialog.create();
                    dialog.show();
                }
            }
        }
        /*  普通对话框的“确定”按钮事件 */
        class okClick implements DialogInterface.OnClickListener
        {
            @Override
            public void onClick(DialogInterface dialog, int which)
            {
                dialog.cancel();
            }
        }
        /*  输入对话框的“确定”按钮事件   */
        class loginClick implements  DialogInterface.OnClickListener
        {
            EditText txt;
            @Override
            public void onClick(DialogInterface dialog, int which)
            {
                txt = (EditText)login.findViewById(R.id.paswdEdit);
                //取出输入编辑框的值与密码“admin”比较
                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();
            }
        }
        /*  输入对话框的“退出”按钮事件   */
        class exitClick implements DialogInterface.OnClickListener
        {
            @Override
            public void onClick(DialogInterface dialog, int which)
            {
                MainActivity.this.finish();
            }
        }
    
    }

### 三、效果展示 ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDE0MTQ3Mw_size_16_color_FFFFFF_t_70][]      ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDE0MTQ3Mw_size_16_color_FFFFFF_t_70 1][]

[20190328112821930.png]: /images/20220227/a95f8311159c47308a8fa1de3f96250d.png
[20190328113048304.png]: /images/20220227/35c3fc24fdda43388d13f3687830e66d.png
[20190328113411466.png]: /images/20220227/4ecfc706264e4445865519fccddd2d20.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDE0MTQ3Mw_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20190328113501151.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDE0MTQ3Mw==,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDE0MTQ3Mw_size_16_color_FFFFFF_t_70 1]: /images/20220227/bc647579c84b4fba877987182a11ecf7.png