android应用实现自动检测版本升级
在我们APP的开发中,往往都会遇到版本的升级,因为不可能有任何一个应用做的完美无缺,所以版本升级对APP应用来说是不可缺少的一部分.像新浪微博等一些应用软件,三天两头提醒我升级.不过这样也很正常,就像android 升级一样,为了给用户提供更方便更人性化的操作.说下具体实现吧,不过我是参考别人的。不管对你们有没有帮助,总之对我有帮助啊,如果日后用到就直接copy了.哈哈,不扯了。
首先看一个文件manifest文件:
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<manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.jj.upgrade" android:versioncode="1" android:versionname="1.0"> </manifest>
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我们可以很清楚的看到versionCode和versionName,我们一般用versionCode来实现, 实现原理很简单:服务器端有个serverVersion,我们本地有个localVersion.服务器端serverVersion>localVersion,这个时候我们就需要进行升级版本.原理大致就是这样。
具体实现请看下面:
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package com.jj.upgrade;
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import com.jj.Service.UpdateService;
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import android.app.AlertDialog;
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import android.app.Application;
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import android.content.DialogInterface;
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import android.content.Intent;
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import android.content.pm.PackageInfo;
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import android.content.pm.PackageManager.NameNotFoundException;
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/*** |
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* MyApplication
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*
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* @author zhangjia
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*
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*/
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public class MyApplication extends Application {
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public static int localVersion = 0;// 本地安装版本
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public static int serverVersion = 2;// 服务器版本
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public static String downloadDir = "jj/";// 安装目录
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@Override
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public void onCreate() {
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super.onCreate();
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try {
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PackageInfo packageInfo = getApplicationContext()
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.getPackageManager().getPackageInfo(getPackageName(), 0);
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localVersion = packageInfo.versionCode;
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} catch (NameNotFoundException e) {
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e.printStackTrace();
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}
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/***
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* 在这里写一个方法用于请求获取服务器端的serverVersion.
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*/
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}
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} |
我们一般把全局的东西放到application里面.
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public class MainActivity extends Activity {
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private MyApplication myApplication;
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@Override
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public void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.main);
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checkVersion();
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}
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/***
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* 检查是否更新版本
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*/
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public void checkVersion() {
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myApplication = (MyApplication) getApplication();
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if (myApplication.localVersion < myApplication.serverVersion) {
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// 发现新版本,提示用户更新
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AlertDialog.Builder alert = new AlertDialog.Builder(this);
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alert.setTitle("软件升级")
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.setMessage("发现新版本,建议立即更新使用.")
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.setPositiveButton("更新",
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new DialogInterface.OnClickListener() {
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public void onClick(DialogInterface dialog,
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int which) {
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Intent updateIntent = new Intent(
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MainActivity.this,
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UpdateService.class);
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updateIntent.putExtra(
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"app_name",
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getResources().getString(
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R.string.app_name));
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startService(updateIntent);
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}
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})
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.setNegativeButton("取消",
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new DialogInterface.OnClickListener() {
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public void onClick(DialogInterface dialog,
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int which) {
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dialog.dismiss();
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}
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});
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alert.create().show();
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}
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}
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} |
我们在运行应用的时候要checkVersion();进行检查版本是否要进行升级. 最主要的是UpdateService服务类
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@Override |
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public int onStartCommand(Intent intent, int flags, int startId) {
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app_name = intent.getStringExtra("app_name");
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// 创建文件
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FileUtil.createFile(app_name);// 创建文件
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createNotification();// 首次创建
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createThread();// 线程下载
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return super.onStartCommand(intent, flags, startId);
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}
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创建路径及文件,这里就不介绍了,不明白了下载源码看。
首先我们先 看createNotification().这个方法:
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/*** |
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* 创建通知栏
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*/
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RemoteViews contentView;
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public void createNotification() {
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notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
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notification = new Notification();
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notification.icon = R.drawable.ic_launcher;// 这个图标必须要设置,不然下面那个RemoteViews不起作用.
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// 这个参数是通知提示闪出来的值.
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notification.tickerText = "开始下载";
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//
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// updateIntent = new Intent(this, MainActivity.class);
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// pendingIntent = PendingIntent.getActivity(this, 0, updateIntent, 0);
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//
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// // 这里面的参数是通知栏view显示的内容
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// notification.setLatestEventInfo(this, app_name, "下载:0%",
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// pendingIntent);
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//
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// notificationManager.notify(notification_id, notification);
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/***
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* 在这里我们用自定的view来显示Notification
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*/
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contentView = new RemoteViews(getPackageName(),
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R.layout.notification_item);
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contentView.setTextViewText(R.id.notificationTitle, "正在下载");
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contentView.setTextViewText(R.id.notificationPercent, "0%");
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contentView.setProgressBar(R.id.notificationProgress, 100, 0, false);
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notification.contentView = contentView;
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updateIntent = new Intent(this, MainActivity.class);
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updateIntent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
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pendingIntent = PendingIntent.getActivity(this, 0, updateIntent, 0);
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notification.contentIntent = pendingIntent;
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notificationManager.notify(notification_id, notification);
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}
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上面实现的也不难理解.(主要是初始化Notification,用于提醒用户开始下载)接着我们要看createThread方法
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/*** |
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* 开线程下载
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*/
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public void createThread() {
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/***
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* 更新UI
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*/
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final Handler handler = new Handler() {
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@Override
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public void handleMessage(Message msg) {
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switch (msg.what) {
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case DOWN_OK:
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// 下载完成,点击安装
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Uri uri = Uri.fromFile(FileUtil.updateFile);
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Intent intent = new Intent(Intent.ACTION_VIEW);
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intent.setDataAndType(uri,
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"application/vnd.android.package-archive");
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pendingIntent = PendingIntent.getActivity(
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UpdateService.this, 0, intent, 0);
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notification.setLatestEventInfo(UpdateService.this,
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app_name, "下载成功,点击安装", pendingIntent);
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notificationManager.notify(notification_id, notification);
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stopSelf();
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break;
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case DOWN_ERROR:
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notification.setLatestEventInfo(UpdateService.this,
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app_name, "下载失败", pendingIntent);
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break;
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default:
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stopSelf();
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break;
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}
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}
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};
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final Message message = new Message();
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new Thread(new Runnable() {
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@Override
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public void run() {
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try {
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long downloadSize = downloadUpdateFile(down_url,
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FileUtil.updateFile.toString());
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if (downloadSize > 0) {
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// 下载成功
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message.what = DOWN_OK;
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handler.sendMessage(message);
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}
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} catch (Exception e) {
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e.printStackTrace();
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message.what = DOWN_ERROR;
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handler.sendMessage(message);
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}
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}
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}).start();
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}
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这个方法有点小多,不过我想大家都看的明白,我在这里简单说名一下:首先我们创建一个handler用于检测最后下载ok还是not ok. 下面我们开启了线程进行下载数据。 我们接着看downloadUpdateFile这个方法:
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/*** |
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* 下载文件
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*
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* @return
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* @throws MalformedURLException
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*/
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public long downloadUpdateFile(String down_url, String file)
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throws Exception {
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int down_step = 5;// 提示step
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int totalSize;// 文件总大小
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int downloadCount = 0;// 已经下载好的大小
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int updateCount = 0;// 已经上传的文件大小
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InputStream inputStream;
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OutputStream outputStream;
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URL url = new URL(down_url);
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HttpURLConnection httpURLConnection = (HttpURLConnection) url
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.openConnection();
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httpURLConnection.setConnectTimeout(TIMEOUT);
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httpURLConnection.setReadTimeout(TIMEOUT);
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// 获取下载文件的size
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totalSize = httpURLConnection.getContentLength();
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if (httpURLConnection.getResponseCode() == 404) {
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throw new Exception("fail!");
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}
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inputStream = httpURLConnection.getInputStream();
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outputStream = new FileOutputStream(file, false);// 文件存在则覆盖掉
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byte buffer[] = new byte[1024];
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int readsize = 0;
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while ((readsize = inputStream.read(buffer)) != -1) {
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outputStream.write(buffer, 0, readsize);
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downloadCount += readsize;// 时时获取下载到的大小
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/**
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* 每次增张5%
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*/
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if (updateCount == 0
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|| (downloadCount * 100 / totalSize - down_step) >= updateCount) {
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updateCount += down_step;
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// 改变通知栏
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// notification.setLatestEventInfo(this, "正在下载...", updateCount
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// + "%" + "", pendingIntent);
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contentView.setTextViewText(R.id.notificationPercent,
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updateCount + "%");
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contentView.setProgressBar(R.id.notificationProgress, 100,
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updateCount, false);
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// show_view
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notificationManager.notify(notification_id, notification);
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}
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}
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if (httpURLConnection != null) {
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httpURLConnection.disconnect();
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}
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inputStream.close();
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outputStream.close();
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return downloadCount;
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}
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注释已经写的很详细,相信大家都看的明白,如果哪里有不足的地方,请留您吉言指出。
这里我用别的app代替了,简单省事,正常的话,你要对你的APP进行数字签名。然后才可以进行升级应用。
示意图: