从php文件更新android（homescreen）小部件

Question

I want to make a android widget that it will update from a php file. i found a lot of examples about widgets and a lot of examples of how to retrieve data from php to an activity but i didn't manage to do it. i need something like this example (http://www.vogella.com/tutorials/AndroidWidgets/article.html) but instead of a random number i need to take the number from my php file..

php file it output a single number that i need to include in my widget (http://www.angryboards.com/data/larnaca/test.php)

this the WidgetProvider class, but when i am trying to call the AsyncTask in onUpdate() it crashes.

public class MyWidgetProvider extends AppWidgetProvider {

 private TextView textView;


  @Override
  public void onUpdate(Context context, AppWidgetManager appWidgetManager,
      int[] appWidgetIds) {

      //call AsyncTask
       String serverURL = "http://www.angryboards.com/data/larnaca/test.php";
         new async().execute(serverURL);
         String txt = textView.getText().toString();


    // Get all ids
    ComponentName thisWidget = new ComponentName(context,
        MyWidgetProvider.class);
    int[] allWidgetIds = appWidgetManager.getAppWidgetIds(thisWidget);
    for (int widgetId : allWidgetIds) {






      RemoteViews remoteViews = new RemoteViews(context.getPackageName(),
          R.layout.widget_layout);

      // Set the text
      remoteViews.setTextViewText(R.id.update, txt);

      // Register an onClickListener
      Intent intent = new Intent(context, MyWidgetProvider.class);

      intent.setAction(AppWidgetManager.ACTION_APPWIDGET_UPDATE);
      intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, appWidgetIds);

      PendingIntent pendingIntent = PendingIntent.getBroadcast(context,
          0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
      remoteViews.setOnClickPendingIntent(R.id.update, pendingIntent);
      appWidgetManager.updateAppWidget(widgetId, remoteViews);
    }
  }

 private class async extends AsyncTask<String, Void, String> {
    @Override
    protected String doInBackground(String... urls) {
      String response = "";
      for (String url : urls) {
        DefaultHttpClient client = new DefaultHttpClient();
        HttpGet httpGet = new HttpGet(url);
        try {
          HttpResponse execute = client.execute(httpGet);
          InputStream content = execute.getEntity().getContent();


          BufferedReader buffer = new BufferedReader(new InputStreamReader(content));
          String s = "";
          while ((s = buffer.readLine()) != null) {
            response += s;
          }

        } catch (Exception e) {
          e.printStackTrace();
        }
      }

      return response;
    }

    @Override
    protected void onPostExecute(String result) {
      textView.setText(result);




    }
  }

} 

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.tasos.widgettest"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="8"

     />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name="com.tasos.widgettest.MainActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

 <receiver
   android:icon="@drawable/logo"
   android:label="Example Widget"
   android:name="MyWidgetProvider" >
   <intent-filter >
        <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
   </intent-filter>

   <meta-data
      android:name="android.appwidget.provider"
      android:resource="@xml/widget_info" />
</receiver> 

</application>
<uses-permission android:name="android.permission.INTERNET" />

</manifest>

widget_info.xml

<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider 
  xmlns:android="http://schemas.android.com/apk/res/android"
android:initialLayout="@layout/widget_layout"
android:minHeight="72dp"
android:minWidth="300dp"
android:updatePeriodMillis="3000" >

</appwidget-provider> 

and in layout i have a textview (android:id="@+id/update") Thanks

Answer 1

Done! i did a service that contains an AsyncTask and i call the service from appwigdetprovider.

My UpdateWidgetService.java

public class UpdateWidgetService extends Service {

public String string;
public String inputLine;
public StringBuilder txt;
public BufferedReader in;
public URL url;



@Override
public void onStart(Intent intent, int startId) {


AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(this.getApplicationContext());
int[] allWidgetIds = intent.getIntArrayExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS);

for (int widgetId : allWidgetIds) {

RemoteViews remoteViews = new     RemoteViews(this.getApplicationContext().getPackageName(),R.layout.widget_layout);
Intent clickIntent = new Intent(this.getApplicationContext(),MyWidgetProvider.class);
clickIntent.setAction(AppWidgetManager.ACTION_APPWIDGET_UPDATE);
clickIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS,allWidgetIds);
PendingIntent pendingIntent = PendingIntent.getBroadcast(getApplicationContext() , 0,     clickIntent,PendingIntent.FLAG_UPDATE_CURRENT);


//refresh tapping the screen
remoteViews.setOnClickPendingIntent(R.id.update, pendingIntent);
new DownloadTask().execute();


appWidgetManager.updateAppWidget(widgetId, remoteViews);
}
stopSelf();

super.onStart(intent, startId);
}

@Override
public IBinder onBind(Intent intent) {
return null;
}

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

@Override
protected String doInBackground(String... arg0) {

try {
url = new URL("http://www.angryboards.com/data/larnaca/latest_wind_value.php");
in = new BufferedReader(new InputStreamReader(url.openStream()));
inputLine = null;
txt = new StringBuilder();
while ((inputLine = in.readLine()) != null) {
string = in.readLine();
txt.append(inputLine);
txt.append('
');


}
in.close();


} catch (MalformedURLException e) {

e.printStackTrace();
} catch (IOException e) {

e.printStackTrace();
}
return null;


}

@Override
protected void onPostExecute(String result) {

AppWidgetManager widgetManager = AppWidgetManager.getInstance(getApplication());
//get widget ids for widgets created
ComponentName widget = new ComponentName(getApplication(), MyWidgetProvider.class);
int[] widgetIds = widgetManager.getAppWidgetIds(widget);
//update text
RemoteViews remoteViews = new RemoteViews(getPackageName(), R.layout.widget_layout);
remoteViews.setTextViewText(R.id.update, txt);
//refresh widget to show text
widgetManager.updateAppWidget(widgetIds, remoteViews); 


}
}


}

MyWidgetProvider.java

public class MyWidgetProvider extends AppWidgetProvider {

  private static final String LOG = "com.tasos.widgettest";


  @Override
  public void onUpdate(Context context, AppWidgetManager appWidgetManager,
  int[] appWidgetIds) {

Log.w(LOG, "onUpdate method called");
// Get all ids
ComponentName thisWidget = new ComponentName(context,
    MyWidgetProvider.class);
int[] allWidgetIds = appWidgetManager.getAppWidgetIds(thisWidget);

// Build the intent to call the service
Intent intent = new Intent(context.getApplicationContext(),
    UpdateWidgetService.class);
intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, allWidgetIds);

// Update the widgets via the service
context.startService(intent);




  }

}