在Java中使用編程方式更新版本

Question

爲了您的幫助，始終閱讀所有答案，我經常使用堆棧溢出，它總是有用的，如果有人能幫助我，我現在沒有找到對我的問題的幫助。很棒。

我做了一個簡單的程序來自動更新我的應用程序。所以下載工作很好，並將apk加入應用程序給我一個致命的錯誤。

通過調試誤差在

startActivity(intent); 

的代碼是：

package com.example.updateversion; 


public class MainActivity extends Activity { 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.activity_main, menu); 

    // *************************** 

    // if (android.os.Build.VERSION.SDK_INT > 9) { 
    StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder() 
      .permitAll().build(); 
    StrictMode.setThreadPolicy(policy); 
    // } 
    java.text.DateFormat dateFormat = android.text.format.DateFormat 
      .getDateFormat(getApplicationContext()); 

    // *************************** 
    String apkurl = "http://192.168.1.1/ANDROID/helloVersion.zip";// "http://www.vogella.com"; 
    try { 

     URL url = new URL(apkurl); 

     HttpURLConnection urlConnection = (HttpURLConnection) url 
       .openConnection(); 
     String PATH = Environment.getExternalStorageDirectory() 
       + "/download/"; 
     try { 

      File file = new File(PATH); 
      file.mkdirs(); 

      File outputFile = new File(file, "helloVersion.apk"); 
      FileOutputStream fos = new FileOutputStream(outputFile); 

      InputStream is = new BufferedInputStream(
        urlConnection.getInputStream()); 

      byte[] buffer = new byte[1024]; 
      int len1 = 0; 
      while ((len1 = is.read(buffer)) != -1) { 
       fos.write(buffer, 0, len1); 
      } 
      fos.close(); 
      is.close(); 

     } finally { 
      try { 
       urlConnection.disconnect(); 
      } catch (Exception e) { 
      } 
     } 

     File apkFile = new File(PATH + "helloVersion.apk"); 
     Intent intent = new Intent(Intent.ACTION_VIEW); 
     intent.setDataAndType(Uri.fromFile(apkFile), 
       "application/com.example.helloversion"); 
     startActivity(intent); // here is the problem 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 
    return true; 
} 

} 

我的錯誤是：

03-19 08:58:29.792: D/AndroidRuntime(28060): Shutting down VM 
03-19 08:58:29.792: W/dalvikvm(28060): threadid=1: thread exiting with uncaught exception (group=0x40a591f8) 
03-19 08:58:29.822: E/AndroidRuntime(28060): FATAL EXCEPTION: main 
03-19 08:58:29.822: E/AndroidRuntime(28060): android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.intent.action.VIEW dat=file:///mnt/sdcard/download/helloVersion.apk typ=application/com.example.helloversion } 
03-19 08:58:29.822: E/AndroidRuntime(28060): at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1512) 
03-19 08:58:29.822: E/AndroidRuntime(28060): at android.app.Instrumentation.execStartActivity(Instrumentation.java:1384) 
03-19 08:58:29.822: E/AndroidRuntime(28060): at android.app.Activity.startActivityForResult(Activity.java:3190) 
03-19 08:58:29.822: E/AndroidRuntime(28060): at android.app.Activity.startActivity(Activity.java:3297) 
03-19 08:58:29.822: E/AndroidRuntime(28060): at com.example.updateversion.MainActivity.onCreateOptionsMenu(MainActivity.java:87) 
03-19 08:58:29.822: E/AndroidRuntime(28060): at android.app.Activity.onCreatePanelMenu(Activity.java:2444) 
03-19 08:58:29.822: E/AndroidRuntime(28060): at com.android.internal.policy.impl.PhoneWindow.preparePanel(PhoneWindow.java:392) 
03-19 08:58:29.822: E/AndroidRuntime(28060): at com.android.internal.policy.impl.PhoneWindow.invalidatePanelMenu(PhoneWindow.java:743) 
03-19 08:58:29.822: E/AndroidRuntime(28060): at com.android.internal.policy.impl.PhoneWindow$1.run(PhoneWindow.java:2859) 
03-19 08:58:29.822: E/AndroidRuntime(28060): at android.os.Handler.handleCallback(Handler.java:605) 
03-19 08:58:29.822: E/AndroidRuntime(28060): at android.os.Handler.dispatchMessage(Handler.java:92) 
03-19 08:58:29.822: E/AndroidRuntime(28060): at android.os.Looper.loop(Looper.java:137) 
03-19 08:58:29.822: E/AndroidRuntime(28060): at android.app.ActivityThread.main(ActivityThread.java:4424) 
03-19 08:58:29.822: E/AndroidRuntime(28060): at java.lang.reflect.Method.invokeNative(Native Method) 
03-19 08:58:29.822: E/AndroidRuntime(28060): at java.lang.reflect.Method.invoke(Method.java:511) 
03-19 08:58:29.822: E/AndroidRuntime(28060): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
03-19 08:58:29.822: E/AndroidRuntime(28060): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
03-19 08:58:29.822: E/AndroidRuntime(28060): at dalvik.system.NativeStart.main(Native Method) 

我的權限是：

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> 
<uses-permission android:name="android.permission.INTERNET" /> 
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 
<uses-permission android:name="android.permission.DELETE_PACKAGES" /> 
<uses-permission android:name="android.permission.INSTALL_PACKAGES" /> 

Answer 1

嘗試使用：

String filepath = "yourfile"; 
Uri fileLoc = Uri.fromFile(new File(filepath)); 
Intent intent = new Intent(Intent.ACTION_VIEW); 
intent.setDataAndType(fileLoc, "application/vnd.android.package-archive"); 
startActivity(intent);