app自动更新(android)

更新插件代码：https://github.com/shixy/UpdateApp

来源：http://aspoems.iteye.com/blog/1897300

检查更新的时候，通过指定的URL获取服务器端版本信息。比较版本，如果更新，访问服务器端返回的apk的URL地址，下载，安装。各种 Makert 也是通过类似的机制实现的。原理搞清楚了，代码就相当简单了。

获取apk的VesionName，即AndroidManifest.xml中定义的android:versionName

1. public String getVesionName(Context context) {
2. String versionName = null;
3. try {
4. versionName = context.getPackageManager().getPackageInfo("net.vpntunnel", 0).versionName;
5. } catch (NameNotFoundException e) {
6. Log.e(TAG, e.getMessage());
7. }
8. return versionName;
9. }

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更新以及安装程序需要的权限，在AndroidManifest.xml中添加

1. <uses-permission android:name="android.permission.INTERNET"></uses-permission>
2. <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
3. <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"></uses-permission>
4. <uses-permission android:name="android.permission.INSTALL_PACKAGES"></uses-permission>

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获取apk的versionCode，即AndroidManifest.xml中定义的android:versionCode

1. public int getVersionCode(Context context) {
2. int versionCode = 0;
3. try {
4. versionCode = context.getPackageManager().getPackageInfo("net.vpntunnel", 0).versionCode;
5. } catch (NameNotFoundException e) {
6. Log.e(TAG, e.getMessage());
7. }
8. return versionCode;
9. }

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服务器端version.JSON，包含apk路径以及版本信息

1. {
2. "ApkName":"NAME",
3. "ApkFullName":"NAME_1.0.5.apk",
4. "VersionName":"1.0.5",
5. "VersionCode":3
6. }

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获取远程服务器的版本信息

1. private void getRemoteJSON(string host) throws ClientProtocolException, IOException, JSONException {
2. String url = String.format("http://%s/%s", host, VER_JSON);
3. StringBuilder sb = new StringBuilder();
4. HttpClient client = new DefaultHttpClient();
5. HttpParams httpParams = client.getParams();
6. HttpConnectionParams.setConnectionTimeout(httpParams, 3000);
7. HttpConnectionParams.setSoTimeout(httpParams, 5000);
8. HttpResponse response = client.execute(new HttpGet(url));
9. HttpEntity entity = response.getEntity();
10. if (entity != null) {
11. BufferedReader reader = new BufferedReader(new InputStreamReader(entity.getContent(), "UTF-8"), 8192);
12. String line = null;
13. while ((line = reader.readLine()) != null) {
14. sb.append(line + "\n");
15. }
16. reader.close();
17. }
18. JSONObject object = (JSONObject) new JSONTokener(sb.toString()).nextValue();
19. this.apkFullName = object.getString("ApkFullName");
20. this.versionName = object.getString("VersionName");
21. this.versionCode = Integer.valueOf(object.getInt("VersionCode"));
22. }

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发现更新的提醒窗口，通过AlertDialog实现

1. private void shoVersionUpdate(String newVersion, final String updateURL) {
2. String message = String.format("%s: %s, %s", mContext.getString(R.string.found_newversion), newVersion, mContext.getString(R.string.need_update));
3. AlertDialog dialog = new AlertDialog.Builder(mContext).setTitle(mContext.getString(R.string.alertdialog_title)).setMessage(message)
4. // update
5. .setPositiveButton(mContext.getString(R.string.alertdialog_update_button), new DialogInterface.OnClickListener() {
6. @Override
7. public void onClick(DialogInterface dialog, int which) {
8. pBar = new ProgressDialog(mContext);
9. pBar.setTitle(mContext.getString(R.string.progressdialog_title));
10. pBar.setMessage(mContext.getString(R.string.progressdialog_message));
11. pBar.setProgressStyle(ProgressDialog.STYLE_SPINNER);
12. dialog.dismiss();
13. downFile(updateURL);
14. }
15. // cancel
16. }).setNegativeButton(mContext.getString(R.string.alertdialog_cancel_button), new DialogInterface.OnClickListener() {
17. public void onClick(DialogInterface dialog, int whichButton) {
18. dialog.dismiss();
19. }
20. }).create();
21. dialog.show();
22. }

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下载新版的apk文件，存放地址可以放到SD卡中。通过Environment.getExternalStorageDirectory()获取SD卡中的路径

1. private void downFile(final String url) {
2. pBar.show();
3. new Thread() {
4. public void run() {
5. HttpClient client = new DefaultHttpClient();
6. HttpGet get = new HttpGet(url);
7. HttpResponse response;
8. try {
9. response = client.execute(get);
10. HttpEntity entity = response.getEntity();
11. long length = entity.getContentLength();
12. InputStream is = entity.getContent();
13. FileOutputStream fileOutputStream = null;
14. if (is != null) {
15. File f = new File(UPDATE_DIR);
16. if (!f.exists()) {
17. f.mkdirs();
18. }
19. fileOutputStream = new FileOutputStream(new File(UPDATE_DIR, updateFileName));
20. byte[] buf = new byte[1024];
21. int ch = -1;
22. int count = 0;
23. while ((ch = is.read(buf)) != -1) {
24. fileOutputStream.write(buf, 0, ch);
25. count += ch;
26. Log.d(TAG, String.valueOf(count));
27. if (length > 0) {
28. }
29. }
30. }
31. fileOutputStream.flush();
32. if (fileOutputStream != null) {
33. fileOutputStream.close();
34. }
35. handler.post(new Runnable() {
36. public void run() {
37. pBar.cancel();
38. installUpdate();
39. }
40. });
41. } catch (Exception e) {
42. pBar.cancel();
43. Log.e(TAG, e.getMessage());
44. }
45. }
46. }.start();
47. }

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安装更新

1. private void installUpdate() {
2. Intent intent = new Intent(Intent.ACTION_VIEW);
3. intent.setDataAndType(Uri.fromFile(new File(UPDATE_DIR, updateFileName)), "application/vnd.android.package-archive");
4. mContext.startActivity(intent);
5. }

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至此更新需要函数就完成了