Implementation of system notification bar message with progress bar in android project

When we are doing Android development, we often encounter background thread execution, such as when downloading files. At this time, we hope that the customer can see that there is an operation being performed in the background. In this case, we can use a progress bar. Since it runs in the background, the purpose is to occupy as little space as possible in the current operation, allowing the user to perform other operations. The best method is to have a notification message with a progress bar in the notification bar. This article provides an example for the reader to refer to.
The effect diagram is as follows:

The main interface only has one button, so no file is provided

Layout file used for notification bar display is content_view.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
  android:layout_width="fill_parent" 
  android:layout_height="fill_parent" 
  android:background="#00000000" 
  android:orientation="vertical"  
  android:padding="5dp"> 
  <ImageView  
    android:id="@"+id/content_view_image" 
    android:layout_width="25dp" 
    android:layout_height="25dp" 
    android:src="@drawable/logo" 
    /> 
  <TextView 
    android:id="@"+id/content_view_text1" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="0%" 
    android:textColor="#000000" 
    android:layout_toRightOf="@id/content_view_image" 
    android:layout_centerHorizontal="true" 
    android:layout_marginTop="5dp" 
    android:layout_marginLeft="15dp" 
   /> 
  <ProgressBar  
    android:id="@"+id/content_view_progress" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    style="@android:style/Widget.ProgressBar.Horizontal" 
    android:max="100" 
    android:layout_below="@id/content_view_image" 
    android:layout_marginTop="4dp" 
    /> 
</RelativeLayout> 

Main running class:

package yyy.testandroid4; 
import java.util.Timer; 
import java.util.TimerTask; 
import android.app.Activity; 
import android.app.AlertDialog.Builder; 
import android.app.Notification; 
import android.app.NotificationManager; 
import android.app.PendingIntent; 
import android.content.DialogInterface; 
import android.content.Intent; 
import android.content.pm.PackageManager.NameNotFoundException; 
import android.os.Bundle; 
import android.os.Handler; 
import android.os.Message; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.RemoteViews; 
import android.widget.Toast; 
public class TestAndroid4Activity extends Activity { 
  private Handler handler = new Handler(){ 
    @Override 
    public void handleMessage(Message msg) { 
      // TODO Auto-generated method stub 
      super.handleMessage(msg); 
      switch (msg.what) { 
      case 0: 
        notif.contentView.setTextViewText(R.id.content_view_text1, len+"%"; 
        notif.contentView.setProgressBar(R.id.content_view_progress, 100, len, false); 
        manager.notify(0, notif); 
        break; 
      case 1: 
        Toast.makeText(TestAndroid4Activity.this, "Download completed", 0).show(); 
        break; 
      default: 
        break; 
      } 
    } 
  }; 
  private Button update, cancel; 
  private int localVersion, serverVersion; 
  private int len; 
  private NotificationManager manager; 
  private Notification notif; 
  /** Called when the activity is first created. */ 
  @Override 
  public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    update = (Button) findViewById(R.id.update); 
    update.setOnClickListener(new OnClickListener() { 
      @Override 
      public void onClick(View arg0) { 
        // TODO Auto-generated method stub 
        //Activity to be opened after clicking on the notification bar 
        Intent intent = new Intent(TestAndroid4Activity.this, OtherActivity.class); 
        PendingIntent pIntent = PendingIntent.getActivity(TestAndroid4Activity.this, 0, intent, 0); 
           manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); 
        notif = new Notification(); 
        notif.icon = R.drawable.logo; 
        notif.tickerText = "New Notification"; 
        //The layout file used for the notification bar display 
        notif.contentView = new RemoteViews(getPackageName(), R.layout.content_view); 
        notif.contentIntent = pIntent; 
        manager.notify(0, notif); 
        new DownLoadThread().start(); 
      } 
    }); 
  } 
 } 
  private class DownLoadThread extends Thread{ 
    private Timer timer = new Timer(); 
    @Override 
    public void run() { 
      // TODO Auto-generated method stub 
      super.run(); 
      timer.schedule(new TimerTask() { 
        @Override 
        public void run() { 
          // TODO Auto-generated method stub 
          Message msg = new Message(); 
          msg.what = 0; 
          msg.obj = len; 
          handler.sendMessage(msg); 
          if(len == 100){ 
            timer.cancel(); 
            handler.sendEmptyMessage(1); 
          } 
        } 
      , 0, 1000); 
      len = 0; 
      try { 
        while(len < 100){ 
          len++; 
          Thread.sleep(1000); 
        } 
      } catch (InterruptedException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
      } 
    } 
  } 
} 

That's all for this article. I hope it will be helpful to everyone's learning and I also hope everyone will support the Naiya Tutorial.

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