android项目实现带进度条的系统通知栏消息

我们在做Android开发的时候经常会遇到后台线程执行的比如说下载文件的时候,这个时候我们希望让客户能看到后台有操作进行，这时候我们就可以使用进度条,那么既然在后台运行,为的就是尽量不占用当前操作空间，用户可能还要进行其他操作,最好的方法就是在通知栏有个通知消息并且有个进度条。本文给一个例子工读者参考.
效果图如下：

主界面只有一个按钮就不上文件了

通知栏显示所用到的布局文件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:class="lazy" data-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> 

主运行类：

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, "下载完成", 0).show(); 
        break; 
      default: 
        break; 
      } 
    } 
  }; 
  private Button update,cancel; 
  private int localVersion,serverVersion; 
  private int len; 
  private NotificationManager manager; 
  private Notification notif; 
   
  @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 
        //点击通知栏后打开的activity 
        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 = "新通知"; 
        //通知栏显示所用到的布局文件 
        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(); 
      } 
    } 
  } 
} 

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