Android应用检查版本更新后,在通知栏下载,更新下载进度,下载完成自动安装,效果图如下:
•检查当前版本号
AndroidManifest文件中的versionCode用来标识版本,在服务器放一个新版本的apk,versioncode大于当前版本,下面代码用来获取versioncode的值
PackageInfo packageInfo = context.getPackageManager().getPackageInfo(context.getPackageName(), 0); int localVersion = packageInfo.versionCode;
用当前versioncode和服务端比较,如果小于,就进行版本更新
•下载apk文件
private void downLoadNewApk(String apkUri, String version) {
manager = (NotificationManager) context
.getSystemService((context.NOTIFICATION_SERVICE));
notify = new Notification();
notify.icon = R.drawable.ic_launcher;
// 通知栏显示所用到的布局文件
notify.contentView = new RemoteViews(context.getPackageName(),
R.layout.view_notify_item);
manager.notify(100, notify);
//建立下载的apk文件
File fileInstall = FileOperate.mkdirSdcardFile("downLoad", APK_NAME
+ version + ".apk");
downLoadSchedule(apkUri, completeHandler, context,
fileInstall);
}
FileOperate是自己写的文件工具类
通知栏显示的布局,view_notify_item.xml
public static void downLoadSchedule(final String uri, final Handler handler, Context context, final File file) { if (!file.exists()) { handler.sendEmptyMessage(-1); return; } // 每次读取文件的长度 final int perLength = 4096; new Thread() { @Override public void run() { super.run(); try { URL url = new URL(uri); HttpURLConnection conn = (HttpURLConnection) url .openConnection(); conn.setDoInput(true); conn.connect(); InputStream in = conn.getInputStream(); // 2865412 long length = conn.getContentLength(); // 每次读取1k byte[] buffer = new byte[perLength]; int len = -1; FileOutputStream out = new FileOutputStream(file); int temp = 0; while ((len = in.read(buffer)) != -1) { // 写入文件 out.write(buffer, 0, len); // 当前进度 int schedule = (int) ((file.length() * 100) / length); // 通知更新进度(10,7,4整除才通知,没必要每次都更新进度) if (temp != schedule && (schedule % 10 == 0 || schedule % 4 == 0 || schedule % 7 == 0)) { // 保证同一个数据只发了一次 temp = schedule; handler.sendEmptyMessage(schedule); } } out.flush(); out.close(); in.close(); } catch (IOException e) { e.printStackTrace(); } } }.start(); }
handler根据下载进度进行更新
•更新通知栏进度条
private Handler completeHandler = new Handler() {
public void handleMessage(android.os.Message msg) {
// 更新通知栏
if (msg.what < 100) {
notify.contentView.setTextViewText(
R.id.notify_updata_values_tv, msg.what + "%");
notify.contentView.setProgressBar(R.id.notify_updata_progress,
100, msg.what, false);
manager.notify(100, notify);
} else {
notify.contentView.setTextViewText(
R.id.notify_updata_values_tv, "下载完成");
notify.contentView.setProgressBar(R.id.notify_updata_progress,
100, msg.what, false);// 清除通知栏
manager.cancel(100);
installApk(fileInstall);
}
};
};
下载完成后调用系统安装。
•安装apk
private void installApk(File file) {
Intent intent = new Intent();
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setAction(android.content.Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(file),
"application/vnd.android.package-archive");
context.startActivity(intent);
}
安装完成搞定



