Android 实现一个简单加载进度条的功能

来源：互联网发布：淘宝店铺模板代码编辑：程序博客网时间：2024/05/22 10:22
1、布局页面<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
  android:orientation="vertical" android:layout_width="match_parent"  
  android:layout_height="match_parent">   
 <!-- 进度条-->
 <ProgressBar 
  style="?android:attr/progressBarStyleHorizontal"    
  android:layout_width="match_parent"    
  android:layout_height="wrap_content"   
  android:id="@+id/pb_progressbar_bar"  /> 
   <!--数字1-100%-->    
<TextView 
 android:layout_width="wrap_content" 
 android:layout_height="wrap_content"        
  android:id="@+id/tv_progressbar_num"/>
  
 <!--开始下载点击按钮-->    
 <Button  
  android:layout_width="wrap_content"        
  android:layout_height="wrap_content"       
  android:text="下载"        
  android:onClick="download"       
 />
</LinearLayout>

2、再实现方法
public class ProgressAtivity extends AppCompatActivity {    private ProgressBar pb_progressbar_bar;    private TextView tv_progressbar_num;    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.progressbar);//        进度条        pb_progressbar_bar = (ProgressBar) findViewById(R.id.pb_progressbar_bar);        tv_progressbar_num = (TextView) findViewById(R.id.tv_progressbar_num);    }    /**     * ANR     * application not responsing 应用程序未响应     * why:在主线程中执行了耗时的操作     * how:在子线程中执行耗时操作     */    public void download(View view) {       new Mythread().start();
    }  
    Handler handler = new Handler() {     
     //接受消息，更新UI界面     
     @Override        
    public void handleMessage(Message msg) {       
       super.handleMessage(msg);            
       int i = msg.what;            
       tv_progressbar_num.setText(i + "");      
   }   
 };   
  /*CalledFromWoringThreadException从错误的线程中调用错误*/       
      class MyThread extends Thread{       
          @Override        
        public void run() {            
          super.run();         
       for (int i = 0; i <=100; i++) {            
       pb_progressbar_bar.setProgress(i);               
       //在子线程中发消息                
        handler.sendEmptyMessage(i);                
        try {                   
        Thread.sleep(100);                
     } catch (InterruptedException e) {                    
      e.printStackTrace();                
   }          
  }       
 }    
}
}

3、最后还需配置
省
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