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 {@Overrideprotected 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" ><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="@string/hello_world" /></LinearLayout>

在Main中的用到的Global.java

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/";
}

写的服务实现UpdateService.java

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")@Overridepublic 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;}}};@Overridepublic IBinder onBind(Intent arg0) {return null;}@Overridepublic 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>() {@Overridepublic 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);}@Overridepublic void onFailure(HttpException error, String msg) {Message message = handler.obtainMessage();message.what = DOWN_ERROR;handler.sendMessage(message);}@Overridepublic void onLoading(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;}
}

基本上凝视写的清清楚楚，这当中用到了Xutils开源框架来下载文件。

如过你认为看的麻烦直接点击下载demo吧，不须要积分.。。。