Android 应用检查更新并下载

1.在Android应用当中都有应用检查更新的要求，往往都是在打开应用的时候去更新下载。

实现的方法是：服务器端提供接口，接口中可以包含在最新APK下载的URL，最新APK的VersionCode，等附带信息。

将最新APK的Versioncode与当前的APP的VersionCode做大小比较就可以知道是否是最新版本，如果是最新版本就下载安装。

2.效果图：

4.上代码：

借用别人的接口：http://jcodecraeer.com/update.php

AppVersion：是版本信息的模型类，基本上和服务端返回的东西是相对应的。

DownloadService：是下载模块。

UpdateChecker：是检查更新，调用下载模块，下载完安装的工具类。

PS：注意Service在Manifest.xml中要申明。

AppVersion：

 1 public class AppVersion {
 2 
 3     private String updateMessage;
 4     private String apkUrl;
 5     private int apkCode;
 6     public static final String APK_DOWNLOAD_URL = "url";
 7     public static final String APK_UPDATE_CONTENT = "updateMessage";
 8     public static final String APK_VERSION_CODE = "versionCode";
 9 
10     public String getUpdateMessage() {
11         return updateMessage;
12     }
13 
14     public void setUpdateMessage(String updateMessage) {
15         this.updateMessage = updateMessage;
16     }
17 
18     public String getApkUrl() {
19         return apkUrl;
20     }
21 
22     public void setApkUrl(String apkUrl) {
23         this.apkUrl = apkUrl;
24     }
25 
26     public int getApkCode() {
27         return apkCode;
28     }
29 
30     public void setApkCode(int apkCode) {
31         this.apkCode = apkCode;
32     }
33 
34 }

DownloadService：

 1 public class DownloadService extends IntentService {
 2 
 3     public static final int UPDATE_PROGRESS = 8344;
 4 
 5     public DownloadService() {
 6         super("DownloadService");
 7     }
 8 
 9     @Override
10     protected void onHandleIntent(Intent intent) {
11         String urlToDownload = intent.getStringExtra("url");
12         System.out.println("URLtOdOWNLOAD-->>" +urlToDownload);
13         String fileDestination = intent.getStringExtra("dest");
14         ResultReceiver receiver = (ResultReceiver) intent
15                 .getParcelableExtra("receiver");
16         try {
17             URL url = new URL(urlToDownload);
18             URLConnection connection = url.openConnection();
19             connection.connect();
20             // this will be useful so that you can show a typical 0-100%
21             // progress bar
22             int fileLength = connection.getContentLength();
23             // download the file
24             InputStream input = new BufferedInputStream(
25                     connection.getInputStream());
26             OutputStream output = new FileOutputStream(fileDestination);
27             byte data[] = new byte[100];
28             long total = 0;
29             int count;
30             while ((count = input.read(data)) != -1) {
31                 total += count;
32                 // publishing the progress....
33                 Bundle resultData = new Bundle();
34                 resultData.putInt("progress", (int) (total * 100 / fileLength));
35                 receiver.send(UPDATE_PROGRESS, resultData);
36                 output.write(data, 0, count);
37             }
38             output.flush();
39             output.close();
40             input.close();
41         } catch (IOException e) {
42             e.printStackTrace();
43         }
44         Bundle resultData = new Bundle();
45         resultData.putInt("progress", 100);
46         receiver.send(UPDATE_PROGRESS, resultData);
47     }
48 }

UpdateChecker：

  1 public class UpdateChecker {
  2     private static final String TAG = "UpdateChecker";
  3     private Context mContext;
  4     // 检查版本信息的线程
  5     private Thread mThread;
  6     // 版本对比地址
  7     private String mCheckUrl;
  8     private AppVersion mAppVersion;
  9     // 下载apk的对话框
 10     private ProgressDialog mProgressDialog;
 11 
 12     private File apkFile;
 13 
 14     public void setCheckUrl(String url) {
 15         mCheckUrl = url;
 16     }
 17 
 18     public UpdateChecker(Context context) {
 19         mContext = context;
 20         // instantiate it within the onCreate method
 21         mProgressDialog = new ProgressDialog(context);
 22         mProgressDialog.setMessage("正在下载");
 23         mProgressDialog.setIndeterminate(false);
 24         mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
 25         mProgressDialog.setCancelable(true);
 26         mProgressDialog
 27                 .setOnCancelListener(new DialogInterface.OnCancelListener() {
 28                     @Override
 29                     public void onCancel(DialogInterface dialog) {
 30 
 31                     }
 32                 });
 33         mProgressDialog
 34                 .setOnDismissListener(new DialogInterface.OnDismissListener() {
 35                     @Override
 36                     public void onDismiss(DialogInterface dialog) {
 37                         // TODO Auto-generated method stub
 38 
 39                     }
 40                 });
 41     }
 42 
 43     public void checkForUpdates() {
 44         if (mCheckUrl == null) {
 45             // throw new Exception("checkUrl can not be null");
 46             return;
 47         }
 48         final Handler handler = new Handler() {
 49             public void handleMessage(Message msg) {
 50                 if (msg.what == 1) {
 51                     mAppVersion = (AppVersion) msg.obj;
 52                     try {
 53                         int versionCode = mContext.getPackageManager()
 54                                 .getPackageInfo(mContext.getPackageName(), 0).versionCode;
 55                         System.out.println("version-->" + versionCode
 56                                 + "  mAppVersion.getApkCode()-->>"
 57                                 + mAppVersion.getApkCode());
 58                         if (mAppVersion.getApkCode() > versionCode) {
 59                             showUpdateDialog();
 60                         } else {
 61                             Toast.makeText(mContext, "已经是最新版本",
 62                                     Toast.LENGTH_SHORT).show();
 63                         }
 64                     } catch (PackageManager.NameNotFoundException ignored) {
 65                         //
 66                     }
 67                 }
 68             }
 69         };
 70 
 71         mThread = new Thread() {
 72             @Override
 73             public void run() {
 74                 // if (isNetworkAvailable(mContext)) {
 75                 Message msg = new Message();
 76                 String json = sendPost();
 77                 Log.i("jianghejie", "json = " + json);
 78                 if (json != null) {
 79                     AppVersion appVersion = parseJson(json);
 80                     msg.what = 1;
 81                     msg.obj = appVersion;
 82                     handler.sendMessage(msg);
 83                 } else {
 84                     Log.e(TAG, "can't get app update json");
 85                 }
 86             }
 87         };
 88         mThread.start();
 89     }
 90 
 91     protected String sendPost() {
 92         HttpURLConnection uRLConnection = null;
 93         InputStream is = null;
 94         BufferedReader buffer = null;
 95         String result = null;
 96         try {
 97             URL url = new URL(mCheckUrl);
 98             uRLConnection = (HttpURLConnection) url.openConnection();
 99             uRLConnection.setDoInput(true);
100             uRLConnection.setDoOutput(true);
101             uRLConnection.setRequestMethod("POST");
102             uRLConnection.setUseCaches(false);
103             uRLConnection.setConnectTimeout(10 * 1000);
104             uRLConnection.setReadTimeout(10 * 1000);
105             uRLConnection.setInstanceFollowRedirects(false);
106             uRLConnection.setRequestProperty("Connection", "Keep-Alive");
107             uRLConnection.setRequestProperty("Charset", "UTF-8");
108             uRLConnection
109                     .setRequestProperty("Accept-Encoding", "gzip, deflate");
110             uRLConnection
111                     .setRequestProperty("Content-Type", "application/json");
112             uRLConnection.connect();
113             is = uRLConnection.getInputStream();
114             String content_encode = uRLConnection.getContentEncoding();
115             if (null != content_encode && !"".equals(content_encode)
116                     && content_encode.equals("gzip")) {
117                 is = new GZIPInputStream(is);
118             }
119             buffer = new BufferedReader(new InputStreamReader(is));
120             StringBuilder strBuilder = new StringBuilder();
121             String line;
122             while ((line = buffer.readLine()) != null) {
123                 strBuilder.append(line);
124             }
125             result = strBuilder.toString();
126         } catch (Exception e) {
127             Log.e(TAG, "http post error", e);
128         } finally {
129             if (buffer != null) {
130                 try {
131                     buffer.close();
132                 } catch (IOException e) {
133                     e.printStackTrace();
134                 }
135             }
136             if (is != null) {
137                 try {
138                     is.close();
139                 } catch (IOException e) {
140                     e.printStackTrace();
141                 }
142             }
143             if (uRLConnection != null) {
144                 uRLConnection.disconnect();
145             }
146         }
147         return result;
148     }
149 
150     private AppVersion parseJson(String json) {
151         AppVersion appVersion = new AppVersion();
152         try {
153             JSONObject obj = new JSONObject(json);
154             String updateMessage = obj.getString(AppVersion.APK_UPDATE_CONTENT);
155             String apkUrl = obj.getString(AppVersion.APK_DOWNLOAD_URL);
156             int apkCode = obj.getInt(AppVersion.APK_VERSION_CODE);
157             System.out.println("updateMessage-->" + updateMessage
158                     + " apkUrl-->>" + apkUrl + "  apkCode-->>" + apkCode);
159             appVersion.setApkCode(apkCode);
160             appVersion.setApkUrl(apkUrl);
161             appVersion.setUpdateMessage(updateMessage);
162         } catch (JSONException e) {
163             Log.e(TAG, "parse json error", e);
164         }
165         return appVersion;
166     }
167 
168     public void showUpdateDialog() {
169         AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
170         // builder.setIcon(R.drawable.icon);
171         builder.setTitle("有新版本");
172         builder.setMessage(mAppVersion.getUpdateMessage());
173         builder.setPositiveButton("下载", new DialogInterface.OnClickListener() {
174             public void onClick(DialogInterface dialog, int whichButton) {
175                 downLoadApk();
176             }
177         });
178         builder.setNegativeButton("忽略", new DialogInterface.OnClickListener() {
179             public void onClick(DialogInterface dialog, int whichButton) {
180 
181             }
182         });
183         builder.show();
184     }
185 
186     public void downLoadApk() {
187         String apkUrl = mAppVersion.getApkUrl();
188         System.out.println("apkUrl-->>" + apkUrl);
189         String dir = mContext.getExternalFilesDir("apk").getAbsolutePath();
190         File folder = Environment.getExternalStoragePublicDirectory(dir);
191         if (folder.exists() && folder.isDirectory()) {
192             // do nothing
193         } else {
194             folder.mkdirs();
195         }
196         String filename = apkUrl.substring(apkUrl.lastIndexOf("/"),
197                 apkUrl.length());
198         String destinationFilePath = dir + "/" + filename;
199         apkFile = new File(destinationFilePath);
200         mProgressDialog.show();
201         Intent intent = new Intent(mContext, DownloadService.class);
202         intent.putExtra("url", apkUrl);
203         intent.putExtra("dest", destinationFilePath);
204         intent.putExtra("receiver", new DownloadReceiver(new Handler()));
205         mContext.startService(intent);
206     }
207 
208     private class DownloadReceiver extends ResultReceiver {
209         public DownloadReceiver(Handler handler) {
210             super(handler);
211         }
212 
213         @Override
214         protected void onReceiveResult(int resultCode, Bundle resultData) {
215             super.onReceiveResult(resultCode, resultData);
216             if (resultCode == DownloadService.UPDATE_PROGRESS) {
217                 int progress = resultData.getInt("progress");
218                 mProgressDialog.setProgress(progress);
219                 if (progress == 100) {
220                     mProgressDialog.dismiss();
221                     // 如果没有设置SDCard写权限，或者没有sdcard,apk文件保存在内存中，需要授予权限才能安装
222                     String[] command = { "chmod", "777", apkFile.toString() };
223                     try {
224                         ProcessBuilder builder = new ProcessBuilder(command);
225                         builder.start();
226                         Intent intent = new Intent(Intent.ACTION_VIEW);
227                         intent.setDataAndType(Uri.fromFile(apkFile),
228                                 "application/vnd.android.package-archive");
229                         mContext.startActivity(intent);
230                     } catch (Exception e) {
231 
232                     }
233                 }
234             }
235         }
236     }
237 }

MainActivity：

 1 public class MainActivity extends Activity {
 2     UpdateChecker update;
 3     @Override
 4     protected void onCreate(Bundle savedInstanceState) {
 5         super.onCreate(savedInstanceState);
 6         setContentView(R.layout.activity_main);
 7         update = new UpdateChecker(MainActivity.this);
 8         findViewById(R.id.btn).setOnClickListener(new OnClickListener() {
 9 
10             @Override
11             public void onClick(View v) {
12                 update.setCheckUrl("http://jcodecraeer.com/update.php");
13                 update.checkForUpdates();
14             }
15         });
16     }
17 
18 }

源码下载：下载

posted @ 2014-12-03 17:30 perfect亮阅读(1280) 评论(0) 编辑收藏举报

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Android 应用检查更新并下载

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