安卓中ProgressDialog用法

最新推荐文章于 2020-02-22 10:39:22 发布

dahuzix

最新推荐文章于 2020-02-22 10:39:22 发布

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分类专栏：安卓开发文章标签：安卓 ProgressDialog 用法

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本文介绍如何在Android应用中创建ProgressDialog并利用线程实时更新UI，包括ProgressDialog的基本配置、线程实现及运行效果展示。

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.新建Android项目 ProgressDialog 在包andorid.huada下建文件ProgressDialogActivity.java

2.ProgressDialogActivity.java代码如下

 package android.huada;

import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
public class ProgressDialogActivity extends Activity {
    /** Called when the activity is first created. */
 
 ProgressDialog progressDialog;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        progress("下载数据中", "请稍等......");
  
      
      
    }
    
    public void progress(String title,String message){
     progressDialog = new ProgressDialog(this);
     updateThread thread= new updateThread();
     progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
     progressDialog.setMessage(message);
     progressDialog.setTitle(title);
     progressDialog.setProgress(0);
     progressDialog.setMax(100);
     progressDialog.show();
     thread.start();
        }
    
    Handler handler = new Handler(){
  @Override
  public void handleMessage(Message msg) {
   // TODO Auto-generated method stub
   if(msg.what>=100){
    progressDialog.cancel();
       }
    progressDialog.setProgress(msg.what);
   super.handleMessage(msg);
  }
     
    };
    
    class updateThread extends Thread{
     public void run(){
      handler.sendEmptyMessage(0);
      try {
    updateThread.sleep(1000);
    handler.sendEmptyMessage(10);
       updateThread.sleep(1000);
       handler.sendEmptyMessage(20);
       updateThread.sleep(1000);
       handler.sendEmptyMessage(30);
       updateThread.sleep(1000);
       handler.sendEmptyMessage(40);
       updateThread.sleep(1000);
       handler.sendEmptyMessage(50);
       updateThread.sleep(1000);
       handler.sendEmptyMessage(60);
       updateThread.sleep(1000);
       handler.sendEmptyMessage(70);
       updateThread.sleep(1000);
       handler.sendEmptyMessage(80);
       updateThread.sleep(1000);
       handler.sendEmptyMessage(100);
       updateThread.sleep(1000);
       
   } catch (InterruptedException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
      
     }
    }; 
}

3.配置文件main.xml代码如下

 <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
</LinearLayout>

4.此项目是通过线程及时修改UI，运行效果图如下