本篇文章主要介绍了android项目实现带进度条的系统通知栏消息，就是实现在通知栏看到下载进度。具有一定的参考价值，感兴趣的小伙伴们可以参考一下。
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
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; /** 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 //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(); } } } } 以上就是android项目实现带进度条的系统通知栏消息的详细内容，更多请关注0133技术站其它相关文章！
