Android應用程序的自我更新

Question

可能重複：
Android: install .apk programmatically

我需要更新我的Android應用程序。在程序的內部，我下載了新版本。我怎樣才能替換當前版本的下載（以編程方式）？

URL url = new URL("http://www.mySite.com/myFolder/myApp.apk"); 
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection(); 
try 
{ 
    FileOutputStream fos = this.getApplicationContext().openFileOutput("myApp.apk", Context.MODE_WORLD_READABLE|Context.MODE_WORLD_WRITEABLE); 

    InputStream in = new BufferedInputStream(urlConnection.getInputStream()); 
    BufferedReader br = new BufferedReader(new InputStreamReader(in, "UTF-8")); 

    StringBuilder sb = new StringBuilder(); 

    byte[] buffer = new byte[8192]; 
    int len; 
    while ((len = in.read(buffer)) != -1) 
    { 
     // EDIT - only write the bytes that have been written to 
     // the buffer, not the whole buffer 
     fos.write(buffer, 0, len); // file to save app 
    } 
    fos.close(); 

    ....  here I have the file of new app, now I need use it 

Answer 1

如果更新後的APK具有相同的包名，並與你只需發送一個意圖，這將調用默認的Android安裝相同的密鑰簽名。已安裝的apk將被覆蓋。

Intent intent = new Intent(Intent.ACTION_VIEW); 
Uri uri = Uri.fromFile(new File(pathToApk)); 
intent.setDataAndType(uri, "application/vnd.android.package-archive"); 
startActivity(intent);