编程式下载和安装APK

Question

我已经看到了一些与此相关的答案，但似乎无法找到我在找什么。假设我有一个自己托管的应用程序。现在说我已经对该应用程序进行了一些更改，并希望在应用程序中告知用户有更新可用。我可以让应用程序成功下载apk文件并开始安装它。安装完成后，应用程序关闭。当我重新启动应用程序时，我所做的任何更改都未应用。所以看起来安装失败了，但没有明显的崩溃。但是，当我安装从Downloads下载管理器下载的apk时，它安装得很好，并且我所做的更改已被应用。有任何想法吗？以下是我用来下载和安装程序的代码部分：

String destination = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS) + "/"; 
String fileName = "TheApp.apk"; 
destination += fileName; 
final Uri uri = Uri.parse("file://" + destination); 

String url = "myapplocation"; 

DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url)); 
request.setDescription("Downloading necessary update files."); 
request.setTitle("Updating The App"); 

final DownloadManager manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE); 
final long downloadId = manager.enqueue(request); 

BroadcastReceiver onComplete = new BroadcastReceiver() { 
    public void onReceive(Context ctxt, Intent intent) { 
     Intent install = new Intent(Intent.ACTION_VIEW); 
     install.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 
     install.setDataAndType(uri, 
       manager.getMimeTypeForDownloadedFile(downloadId)); 

       startActivityForResult(install, 0); 

       unregisterReceiver(this); 
    } 
}; 
registerReceiver(onComplete, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE)); 

Answer 1

获取当前正在运行的应用程序的VersionName和VersionCode。 代码：

   try { 
         PackageInfo pInfo = context.getPackageManager().getPackageInfo(context.getPackageName(), 0); 
         Common.VersionName = pInfo.versionName; 
         Common.VersionCode = pInfo.versionCode; 
         Log.e("VersionCode", ">>>>>>>>>>" + Common.VersionCode + Common.VersionName); 
        } catch (PackageManager.NameNotFoundException e) { 
         e.printStackTrace(); 
        } 
**Check the Version Names** 
       if (!Common.VersionName.equals(Common.VersionNamefromWebApi)) { 
         AlertDialogUpdate(MakeTransactionActivity.this, Common.AppUpdateTitle, "YokoYepi Version" + Common.VersionNamefromWebApi + " available."); 
        } 
**Alert Dialog Box**  
    public void AlertDialogUpdate(Activity activity, String title, CharSequence message) { 
      AlertDialog.Builder builder = new AlertDialog.Builder(activity); 
      builder.setCancelable(false); 
      if (title != null) builder.setTitle(title); 
      builder.setMessage(message); 

      builder.setPositiveButton("UPDATE", new DialogInterface.OnClickListener() { 
       public void onClick(DialogInterface dialog, int which) { 
        new DownloadNewVersion().execute(); 
        dialog.dismiss(); 
       } 
      }); 
      builder.show(); 
     }  
**Download and Install the .apk file from URL**  
    class DownloadNewVersion extends AsyncTask<String, Integer, Boolean> { 
      @Override 
      protected void onPreExecute() { 
       super.onPreExecute(); 
       bar = new ProgressDialog(MakeTransactionActivity.this); 
       bar.setCancelable(false); 
       bar.setMessage("Downloading..."); 
       bar.setIndeterminate(true); 
       bar.setCanceledOnTouchOutside(false); 
       bar.show(); 
       stoptimertask(); 
      } 

      protected void onProgressUpdate(Integer... progress) { 
       super.onProgressUpdate(progress); 
       bar.setIndeterminate(false); 
       bar.setMax(100); 
       bar.setProgress(progress[0]); 
       String msg = ""; 
       if (progress[0] > 99) { 
        msg = "Finishing... "; 
       } else { 
        msg = "Downloading... " + progress[0] + "%"; 
       } 
       bar.setMessage(msg); 
      } 

      @Override 
      protected void onPostExecute(Boolean result) { 
       super.onPostExecute(result); 
       startTimer(); 
       bar.dismiss(); 
       if (result) { 
        Toast.makeText(getApplicationContext(), "Update Done", 
          Toast.LENGTH_SHORT).show(); 
       } else { 
        Toast.makeText(getApplicationContext(), "Error: Try Again", 
          Toast.LENGTH_SHORT).show(); 
       } 
      } 

      @Override 
      protected Boolean doInBackground(String... arg0) { 
       Boolean flag = false; 
       try { 
        String PATH; 
        Boolean isSDPresent = android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED); 
        if (isSDPresent) { 
         PATH = Environment.getExternalStorageDirectory() + "/Download/"; 
        } else { 
         PATH = Environment.getDataDirectory() + "/Download/"; 
        } 
        File file = new File(PATH); 
        file.mkdirs(); 
        File outputFile = new File(file, "yokoyepi.apk"); 
        if (outputFile.exists()) { 
         outputFile.delete(); 
        } 
        // Download File from url 
        URL u = new URL(Common.AppUpdateURL); 
        URLConnection conn = u.openConnection(); 
        int contentLength = conn.getContentLength(); 

        DataInputStream stream = new DataInputStream(u.openStream()); 

        byte[] buffer = new byte[contentLength]; 
        stream.readFully(buffer); 
        stream.close(); 

        DataOutputStream fos = new DataOutputStream(new FileOutputStream(outputFile)); 
        fos.write(buffer); 
        fos.flush(); 
        fos.close(); 
        // Install dowloaded Apk file from Devive---------------- 
        OpenNewVersion(PATH); 
        flag = true; 
       } catch (MalformedURLException e) { 
        Log.e(TAG, "Update Error: " + e.getMessage()); 
        flag = false; 
       } catch (IOException e) { 
        Log.e(TAG, "Update Error: " + e.getMessage()); 
        flag = false; 
       } catch (Exception e) { 
        Log.e(TAG, "Update Error: " + e.getMessage()); 
        flag = false; 
       } 
       return flag; 
      } 

     }   
    void OpenNewVersion(String location) { 
      Intent intent = new Intent(Intent.ACTION_VIEW); 
      intent.setDataAndType(Uri.fromFile(new File(location + "yokoyepi.apk")), 
        "application/vnd.android.package-archive"); 
      intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
      startActivity(intent); 
     } 
// if your not install u should call the function in onResume(). 
// again it will check whether apk updated or not.