安卓开发04：对话框例子

最新推荐文章于 2022-11-09 16:20:16 发布

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本文详细介绍了在布局中如何设置两个可点击的按钮，分别实现打开普通对话框与进度条的功能。通过示例代码展示了如何在Android应用中使用Button组件触发Dialog和ProgressDialog的显示，包括自定义对话框样式、添加输入框、多选项等功能，并通过线程实现进度条的动态更新。

layout中设置两个可点击按钮：

[html]view plaincopyprint? 
   
 <?xml version="1.0" encoding="utf-8"?>    
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    
     android:layout_width="fill_parent"    
     android:layout_height="fill_parent"    
     android:orientation="vertical" >    
         
 <Button    
     android:id="@+id/btn_dialog"    
     android:layout_width="fill_parent"     
     android:layout_height="wrap_content"    
     android:text="@string/dialog"    
     android:onClick="onClickDialog" />    
       
 <Button    
     android:id="@+id/btn_dialogs"    
     android:layout_width="fill_parent"     
     android:layout_height="wrap_content"    
     android:text="@string/progressDialog"    
     android:onClick="onClickProgressDialog" />    
      
 </LinearLayout>   

Activity代码：

[java]view plaincopyprint? 
   
 package com.example.androidtest;  
   
   
 import android.app.Activity;  
 import android.app.AlertDialog;  
 import android.app.AlertDialog.Builder;  
 import android.app.Dialog;  
 import android.app.ProgressDialog;  
 import android.content.DialogInterface;  
 import android.os.Bundle;  
 import android.util.Log;  
 import android.view.Menu;  
 import android.view.View;  
 import android.view.Window;  
 import android.widget.EditText;  
 import android.widget.Toast;  
   
 public class MainActivity extends Activity {  
   
     private String tag = "MainActivity";  
   
     @Override  
     protected void onCreate(Bundle savedInstanceState) {  
         super.onCreate(savedInstanceState);  
         requestWindowFeature(Window.FEATURE_NO_TITLE);  
         setContentView(R.layout.activity_main); //设置一个View模板  
         Log.d(tag, "In the onCreate() event");  
     }  
   
     @Override  
     public void onStart() {  
         super.onStart();  
         Log.d(tag, "In the onStart() event");  
         Toast.makeText(getBaseContext(), "onStart", Toast.LENGTH_SHORT).show();  
     }  
   
     public void onRestart() {  
         super.onRestart();  
         Log.d(tag, "In the onRestart() event");  
     }  
   
     public void onResume() {  
         super.onResume();  
         Log.d(tag, "In the onResume() event");  
     }  
   
     public void onPause() {  
         super.onPause();  
         Log.d(tag, "In the onPause() event");  
     }  
   
     public void onStop() {  
         super.onStop();  
         Log.d(tag, "In the onStop() event");  
     }  
   
     public void onDestroy() {  
         super.onDestroy();  
         Log.d(tag, "In the onDestroy() event");  
     }  
   
     @Override  
     public boolean onCreateOptionsMenu(Menu menu) {  
         getMenuInflater().inflate(R.menu.main, menu);  
         return true;  
     }  
       
     /** 
      * 点击打开对话框 
      * @param v 
      */  
     @SuppressWarnings("deprecation")  
     public void onClickDialog(View v) {  
         Log.d(tag, "onClickDialog");  
         showDialog(0);  
     }  
   
     /** 
      * 点击打开进度条 
      * @param v 
      */  
     public void onClickProgressDialog(View v) {  
         Log.d(tag, "onClickProgressDialog");  
         final ProgressDialog progressDialog = new ProgressDialog(this);  
         progressDialog.setTitle("ProgressDialog"); //设置标题  
         progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); //设置样式  
         progressDialog.setMessage("please wait...");  
         progressDialog.setProgress(0); //设置进度开始点  
         progressDialog.setMax(100); //进度最大是100  
         progressDialog.show();  
         new Thread(new Runnable() {  
   
             public void run() {  
                 try {  
                     Thread.sleep(1000);  
                     progressDialog.setProgress(10); //每隔1秒就可以设置10  
                     Thread.sleep(1000);  
                     progressDialog.setProgress(20);  
                     Thread.sleep(1000);  
                     progressDialog.setProgress(30);  
                     Thread.sleep(1000);  
                     progressDialog.setProgress(40);  
                     Thread.sleep(1000);  
                     progressDialog.setProgress(50);  
                     Thread.sleep(1000);  
                     progressDialog.setProgress(60);  
                     Thread.sleep(1000);  
                     progressDialog.setProgress(70);  
                     Thread.sleep(1000);  
                     progressDialog.setProgress(90);  
                     Thread.sleep(1000);  
                     progressDialog.setProgress(100);  
                     Thread.sleep(1000);  
                     progressDialog.dismiss();  
                 } catch (InterruptedException e) {  
                     e.printStackTrace();  
                 }  
             }  
         }).start();  
     }  
   
     @Override  
     protected Dialog onCreateDialog(int id) {  
         switch (id) {  
             case 0:  
                 Builder builder = new AlertDialog.Builder(this); //创建一个对话框  
                 builder.setTitle("Android 对话框"); //设置标题  
                 builder.setMessage("message"); //设置message  
                 builder.setIcon(android.R.drawable.ic_dialog_info); //设置图标  
                 builder.setView(new EditText(this)); //设置一个填写的框  
                 builder.setMultiChoiceItems(new String[] {"选项1","选项2","选项3","选项4"}, null, null); //选择框  
                 builder.setPositiveButton("确认", new DialogInterface.OnClickListener() {  
                      
                     public void onClick(DialogInterface dialog, int whichButton) {  
                         Toast.makeText(getBaseContext(), "YES!", Toast.LENGTH_SHORT).show();  
                     }  
                 });  
                 builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {  
   
                     public void onClick(DialogInterface dialog, int whichButton) {  
                         Toast.makeText(getBaseContext(), "NO!", Toast.LENGTH_SHORT).show();  
                     }  
                 });  
                 return builder.create();  
         }  
         return null;  
     }  
   
 }  

普通对话框：

我们可以看到layout布局视图中有两个按钮，第一个按钮点击后打开的是普通对话框，点击事件android:onClick后调用Activity中的onClickDialog方法

[html]view plaincopyprint? 
   
       
 <Button    
     android:id="@+id/btn_dialog"    
     android:layout_width="fill_parent"     
     android:layout_height="wrap_content"    
     android:text="@string/dialog"    
     android:onClick="onClickDialog" />    

Activity中，Dialog代码：

[java]view plaincopyprint? 
   
 /** 
  * 点击打开对话框 
  * @param v 
  */  
 @SuppressWarnings("deprecation")  
 public void onClickDialog(View v) {  
     Log.d(tag, "onClickDialog");  
     showDialog(0);  
 }  
   
 /** 
  * 需要重写创建Dialog方法 
  */  
 @Override  
 protected Dialog onCreateDialog(int id) {  
     switch (id) {  
         case 0:  
             Builder builder = new AlertDialog.Builder(this); //创建一个对话框  
             builder.setTitle("Android 对话框"); //设置标题  
             builder.setMessage("message"); //设置message  
             builder.setIcon(android.R.drawable.ic_dialog_info); //设置图标  
             builder.setView(new EditText(this)); //设置一个填写的框  
             builder.setMultiChoiceItems(new String[] {"选项1","选项2","选项3","选项4"}, null, null); //选择框  
             builder.setPositiveButton("确认", new DialogInterface.OnClickListener() {  
                  
                 public void onClick(DialogInterface dialog, int whichButton) {  
                     Toast.makeText(getBaseContext(), "YES!", Toast.LENGTH_SHORT).show();  
                 }  
             });  
             builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {  
   
                 public void onClick(DialogInterface dialog, int whichButton) {  
                     Toast.makeText(getBaseContext(), "NO!", Toast.LENGTH_SHORT).show();  
                 }  
             });  
             return builder.create();  
     }  
     return null;  
 }  

进度对话框：

layout中第二个按钮就是调用进度对话框，进度对话框可以显示程序运行进度。

[html]view plaincopyprint? 
   
 <Button    
     android:id="@+id/btn_dialogs"    
     android:layout_width="fill_parent"     
     android:layout_height="wrap_content"    
     android:text="@string/progressDialog"    
     android:onClick="onClickProgressDialog" />   

Activity中，我们需要创建一个进度Dialog:

[java]view plaincopyprint? 
   
 /** 
    * 点击打开进度条 
    * @param v 
    */  
   public void onClickProgressDialog(View v) {  
       Log.d(tag, "onClickProgressDialog");  
       final ProgressDialog progressDialog = new ProgressDialog(this);  
       progressDialog.setTitle("ProgressDialog"); //设置标题  
       progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); //设置样式  
       progressDialog.setMessage("please wait...");  
       progressDialog.setProgress(0); //设置进度开始点  
       progressDialog.setMax(100); //进度最大是100  
       progressDialog.show();  
       new Thread(new Runnable() {  
   
           public void run() {  
               try {  
                   //每1秒后，进度条显示10%  
                   Thread.sleep(1000);  
                   progressDialog.setProgress(10); //每隔1秒就可以设置10  
                   Thread.sleep(1000);  
                   progressDialog.setProgress(20);  
                   Thread.sleep(1000);  
                   progressDialog.setProgress(30);  
                   Thread.sleep(1000);  
                   progressDialog.setProgress(40);  
                   Thread.sleep(1000);  
                   progressDialog.setProgress(50);  
                   Thread.sleep(1000);  
                   progressDialog.setProgress(60);  
                   Thread.sleep(1000);  
                   progressDialog.setProgress(70);  
                   Thread.sleep(1000);  
                   progressDialog.setProgress(90);  
                   Thread.sleep(1000);  
                   progressDialog.setProgress(100);  
                   Thread.sleep(1000);  
                   progressDialog.dismiss();  
               } catch (InterruptedException e) {  
                   e.printStackTrace();  
               }  
           }  
       }).start();  
   }  

消息模式弹出框：

[java]view plaincopyprint? 
   
 Toast.makeText(getBaseContext(), "YES!", Toast.LENGTH_SHORT).show();   

也可以自定义：

[java]view plaincopyprint? 
   
 Toast toast=Toast.makeText(getApplicationContext(), "显示带图片的toast", 3000);   
               toast.setGravity(Gravity.CENTER, 0, 0);   
               //创建图片视图对象   
               ImageView imageView= new ImageView(getApplicationContext());   
               //设置图片   
               imageView.setImageResource(R.drawable.ic_launcher);   
               //获得toast的布局   
               LinearLayout toastView = (LinearLayout) toast.getView();   
               //设置此布局为横向的   
               toastView.setOrientation(LinearLayout.HORIZONTAL);   
               //将ImageView在加入到此布局中的第一个位置   
               toastView.addView(imageView, 0);   
               toast.show();  