在网上查询了下，Android版本号更新通知栏带进度条，醉了，基本都是复制过来。有的代码不全，连源代码下载都没有，有下载也须要积分。还不能用。真黑心啊！！

之前自己也写过自己定义通知栏Notification，想了还是自己写吧。

由于在通知栏更新，须要訪问网络下载，就写了个服务。在服务中实现了下载个更新。

先看MainActivity代码：

package com.wsj.wsjdemo;

import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.view.Menu;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initGlobal();
        checkVersion();
    }
    /**
     * 初始化全局变量
     * 实际工作中这种方法中serverVersion从服务器端获取，最好在启动画面的activity中运行
     */
    public void initGlobal(){
        try{
            Global.localVersion = getPackageManager().getPackageInfo(getPackageName(),0).versionCode; //设置本地版本号号
            Global.serverVersion = 2;//假定服务器版本号为2，本地版本号默认是1
        }catch (Exception ex){
            ex.printStackTrace();
        }
    }
    /**
     * 检查更新版本号
     */
    public void checkVersion(){
     
        if(Global.localVersion < Global.serverVersion){
            //发现新版本号。提示用户更新
            AlertDialog.Builder alert = new AlertDialog.Builder(this);
            alert.setTitle("软件升级")
                 .setMessage("发现新版本号,建议马上更新使用.")
                 .setPositiveButton("更新", new DialogInterface.OnClickListener() {
                     public void onClick(DialogInterface dialog, int which) {
                         //开启更新服务UpdateService
                         //这里为了把update更好模块化，能够传一些updateService依赖的值
                         //如布局ID，资源ID。动态获取的标题,这里以app_name为例
                         Intent updateIntent =new Intent(MainActivity.this, UpdateService.class);
                         updateIntent.putExtra("app_name",R.string.app_name);
                         updateIntent.putExtra("downurl","http://www.subangloan.com/Contract/App/Android/caijia_unsign_signed.apk");
                         startService(updateIntent);
                     }
                 })
                 .setNegativeButton("取消",new DialogInterface.OnClickListener(){
                     public void onClick(DialogInterface dialog, int which) {
                         dialog.dismiss();
                     }
                 });
            alert.create().show();
        }else{
            //清理工作，略去
            //cheanUpdateFile(),文章后面我会附上代码
        }
    }
}

activity_main.xml文件：什么都没有就一个简单界面

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

</LinearLayout>

package com.wsj.wsjdemo;

public class Global {
	 //版本号信息
    public static int localVersion = 0;
    public static int serverVersion = 0;
    public static String downloadDir = "app/download/";
}

package com.wsj.wsjdemo;

import java.io.File;
import java.io.IOException;
import java.text.DecimalFormat;

import com.lidroid.xutils.HttpUtils;
import com.lidroid.xutils.exception.HttpException;
import com.lidroid.xutils.http.ResponseInfo;
import com.lidroid.xutils.http.callback.RequestCallBack;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.widget.RemoteViews;


public class UpdateService extends Service {
	private static String down_url; // = "http://192.168.1.112:8080/360.apk";
	private static final int DOWN_OK = 1; // 下载完毕
	private static final int DOWN_ERROR = 0;

	private String app_name;

	private NotificationManager notificationManager;
	private Notification notification;

	private Intent updateIntent;
	private PendingIntent pendingIntent;
	private String updateFile;

	private int notification_id = 0;
	long totalSize = 0;// 文件总大小
	/***
	 * 更新UI
	 */
	final Handler handler = new Handler() {
		@SuppressWarnings("deprecation")
		@Override
		public void handleMessage(Message msg) {
			switch (msg.what) {
			case DOWN_OK:
				// 下载完毕，点击安装
				Intent installApkIntent = getFileIntent(new File(updateFile));
				pendingIntent = PendingIntent.getActivity(UpdateService.this, 0, installApkIntent, 0);
				notification.contentIntent = pendingIntent;
				notification.flags |= Notification.FLAG_AUTO_CANCEL;
				notification.setLatestEventInfo(UpdateService.this, app_name, "下载成功，点击安装", pendingIntent);
				notificationManager.notify(notification_id, notification);
				stopService(updateIntent);
				break;
			case DOWN_ERROR:
				notification.setLatestEventInfo(UpdateService.this, app_name, "下载失败", pendingIntent);
				break;
			default:
				stopService(updateIntent);
				break;
			}
		}
	};

	@Override
	public IBinder onBind(Intent arg0) {
		return null;
	}

	@Override
	public int onStartCommand(Intent intent, int flags, int startId) {
		if (intent != null) {
			try {
				app_name = intent.getStringExtra("app_name");
				down_url = intent.getStringExtra("downurl");
				// 创建文件
				File updateFile = FileUtils.getDiskCacheDir(getApplicationContext(), "xxxx.apk");
				if (!updateFile.exists()) {
					try {
						updateFile.createNewFile();
					} catch (IOException e) {
						e.printStackTrace();
					}
				}
				// 创建通知
				createNotification();
				// 開始下载
				downloadUpdateFile(down_url, updateFile.getAbsolutePath());
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
		return super.onStartCommand(intent, flags, startId);
	}

	/***
	 * 创建通知栏
	 */
	RemoteViews contentView;

	@SuppressWarnings("deprecation")
	public void createNotification() {

		notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
		notification = new Notification();
		notification.icon = R.drawable.ic_launcher;
		// 这个參数是通知提示闪出来的值.
		notification.tickerText = "開始下载";

		// pendingIntent = PendingIntent.getActivity(this, 0, updateIntent, 0);

		// 这里面的參数是通知栏view显示的内容
		notification.setLatestEventInfo(this, app_name, "下载：0%", pendingIntent);

		// notificationManager.notify(notification_id, notification);

		/***
		 * 在这里我们用自定的view来显示Notification
		 */
		contentView = new RemoteViews(getPackageName(), R.layout.notification_item);
		contentView.setTextViewText(R.id.notificationTitle, "正在下载");
		contentView.setTextViewText(R.id.notificationPercent, "0%");
		contentView.setProgressBar(R.id.notificationProgress, 100, 0, false);

		notification.contentView = contentView;

		updateIntent = new Intent(this, MainActivity.class);
		updateIntent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
		pendingIntent = PendingIntent.getActivity(this, 0, updateIntent, 0);

		notification.contentIntent = pendingIntent;
		notificationManager.notify(notification_id, notification);
	}

	/***
	 * 下载文件
	 */
	public void downloadUpdateFile(String down_url, String file) throws Exception {
		updateFile = file;
		HttpUtils HttpUtils = new HttpUtils();
		HttpUtils.download(down_url, file, new RequestCallBack<File>() {

			@Override
			public void onSuccess(ResponseInfo<File> responseInfo) {
				// 下载成功
				Message message = handler.obtainMessage();
				message.what = DOWN_OK;
				handler.sendMessage(message);
				installApk(new File(updateFile), UpdateService.this);
			}

			@Override
			public void onFailure(HttpException error, String msg) {
				Message message = handler.obtainMessage();
				message.what = DOWN_ERROR;
				handler.sendMessage(message);
			}

			@Override
			public void onl oading(long total, long current, boolean isUploading) {
				super.onLoading(total, current, isUploading);
				double x_double = current * 1.0;
				double tempresult = x_double / total;
				DecimalFormat df1 = new DecimalFormat("0.00"); // ##.00%
				// 百分比格式。后面不足2位的用0补齐
				String result = df1.format(tempresult);
				contentView.setTextViewText(R.id.notificationPercent, (int) (Float.parseFloat(result) * 100) + "%");
				contentView.setProgressBar(R.id.notificationProgress, 100, (int) (Float.parseFloat(result) * 100), false);
				notificationManager.notify(notification_id, notification);
			}
		});
	}
	// 下载完毕后打开安装apk界面
		public static void installApk(File file, Context context) {
			//L.i("msg", "版本号更新获取sd卡的安装包的路径=" + file.getAbsolutePath());
			Intent openFile = getFileIntent(file);
			context.startActivity(openFile);

		}

		public static Intent getFileIntent(File file) {
			Uri uri = Uri.fromFile(file);
			String type = getMIMEType(file);
			Intent intent = new Intent("android.intent.action.VIEW");
			intent.addCategory("android.intent.category.DEFAULT");
			intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
			intent.setDataAndType(uri, type);
			return intent;
		}
		public static String getMIMEType(File f) {
			String type = "";
			String fName = f.getName();
			// 取得扩展名
			String end = fName
					.substring(fName.lastIndexOf(".") + 1, fName.length());
			if (end.equals("apk")) {
				type = "application/vnd.android.package-archive";
			} else {
				// /*假设无法直接打开。就跳出软件列表给用户选择 */
				type = "*/*";
			}
			return type;
		}
}

如过你认为看的麻烦直接点击下载demo吧，不须要积分.。。。