postExecuteでグローバル変数を定義する方法は？

Question

AndroidStudioにpostExecuteとonReceiveの問題があります。これは私のコードです：

public void onReceive(Context context, Intent intent) { 
    super.onReceive(context, intent); 
    remoteViews = new RemoteViews(context.getPackageName(), R.layout.smap_activity); 

    if (MY_BUTTTON_START.equals(intent.getAction())){ 
     new DownloadTask().execute("http://examplepage.net"); 
     RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.smap_activity); 
     Log.d("TAG", "TA" + sms); 
     remoteViews.setTextViewText(R.id.sms, sms); 
     AppWidgetManager.getInstance(context).updateAppWidget(new ComponentName(context, SmapActivity.class), remoteViews); 
    } 

}; 

public class DownloadTask extends AsyncTask<String, Void, String> { 

    @Override 
    protected String doInBackground(String... params) { 
     //do your request in here so that you don't interrupt the UI thread 
     try { 
      return downloadContent(params[0]); 
     } catch (IOException e) { 
      return "Unable to retrieve data. URL may be invalid."; 
     } 
    } 

    @Override 
    public void onPostExecute(String result) { 
     String[] smsCzesci = result.split(" "); 
     Log.d("TAG", smsCzesci[1]); 
     sms = smsCzesci[0]; 
    } 
} 

public String downloadContent(String myurl) throws IOException { 
    InputStream is = null; 
    int length = 500; 

    try { 
     URL url = new URL(myurl); 
     HttpURLConnection conn = (HttpURLConnection) url.openConnection(); 
     conn.setReadTimeout(10000 /* milliseconds */); 
     conn.setConnectTimeout(15000 /* milliseconds */); 
     conn.setRequestMethod("GET"); 
     conn.setDoInput(true); 
     conn.connect(); 
     int response = conn.getResponseCode(); 
     is = conn.getInputStream(); 
     // Convert the InputStream into a string 
     String contentAsString = convertInputStreamToString(is, length); 
     return contentAsString; 
    } finally { 
     if (is != null) { 
      is.close(); 
     } 
    } 
} 

public String convertInputStreamToString(InputStream stream, int length) throws IOException, UnsupportedEncodingException { 
    Reader reader = null; 
    reader = new InputStreamReader(stream, "UTF-8"); 
    char[] buffer = new char[length]; 
    reader.read(buffer); 
    return new String(buffer); 
} 

常に私の変数「SMS」=テストが、この方法ではpostExecute変数iが必要なデータを持っています。 onReceiveに "sms"変数を使用して、この変数にウィジェットのテキストを設定しますが、onReceiveメソッドでは、この変数はデフォルトです。

Answer 1

onPostExecute-法にあなたのAsyncTaskの結果を必要とするコードに移動

：

public class DownloadTask extends AsyncTask<String, Void, String> { 
    private final Context context; 

    public DownloadTask(final Context context) { 
    this.context = context; 
    } 

    @Override 
    protected String doInBackground(String... params) { 
    //do your request in here so that you don't interrupt the UI thread 
    try { 
     return downloadContent(params[0]); 
    } catch (IOException e) { 
     return "Unable to retrieve data. URL may be invalid."; 
    } 
    } 

    @Override 
    public void onPostExecute(String result) { 
    String[] smsCzesci = result.split(" "); 
    Log.d("TAG", smsCzesci[1]); 
    sms = smsCzesci[0]; 
    RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.smap_activity); 
    Log.d("TAG", "TA" + sms); 
    remoteViews.setTextViewText(R.id.sms, sms); 
    AppWidgetManager.getInstance(context).updateAppWidget(new ComponentName(context, SmapActivity.class), remoteViews) 
    } 
} 

がであなたのDownloadTaskを呼び出します。

new DownloadTask(context).execute("examplepage.net"); 

Answer 2

onPostExecuteをコールバックのようなものです。呼び出しを実行した後でやりたいことは、このメソッドの内部に記述する必要があります。あなたのコードではDownloadTaskクラスを削除し、onReceiveメソッド内のすべてを書きます。次のように：

public void onReceive(Context context, Intent intent) { 
    super.onReceive(context, intent); 
    remoteViews = new RemoteViews(context.getPackageName(), R.layout.smap_activity); 

    if (MY_BUTTTON_START.equals(intent.getAction())){ 
     AsyncTask downloadTask = new AsyncTask<String, Void, String>(){ 
      @Override 
      protected String doInBackground(String... params) { 
       //do your request in here so that you don't interrupt the UI thread 
       try { 
        return downloadContent(params[0]); 
       } catch (IOException e) { 
        return "Unable to retrieve data. URL may be invalid."; 
       } 
      } 

      @Override 
      public void onPostExecute(String result) { 
       String[] smsCzesci = result.split(" "); 
       Log.d("TAG", smsCzesci[1]); 
       sms = smsCzesci[0]; 

       RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.smap_activity); 
       Log.d("TAG", "TA" + sms); 
       remoteViews.setTextViewText(R.id.sms, sms); 
       AppWidgetManager.getInstance(context).updateAppWidget(new ComponentName(context, SmapActivity.class), remoteViews); 
      } 
     }; 
     downloadTask.execute("http://examplepage.net"); 
    } 

};