Not able to call runOnUiThread in a thread from in

问题:

This question already has answers here:

Accessing UI thread handler from a service (7 answers)

Closed 6 years ago.

I wanted to make a service which will check my SMS in every 20 sec if there are any unread SMS then send it to my website then mark as read for posting data to website I used asynctask and it worked fine when I tried manually (by making button click type app) but in side service I cant define

runOnUiThread(new Runnable() {
            @Override
            public void run() { new MyAsyncTask().execute(sender,time,message);}
        });

it is unable to identify and asks me to define runOnUiThread Is there any way to call my asynctask from the place where I am calling in below code

public class TestService extends Service {

    String sender = null;
    String time = null;
    String message = null;

    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
        throw new UnsupportedOperationException("Not yet implemented");
    }

    @Override
    public void onCreate() {
        Toast.makeText(getApplicationContext(), "Service Created", 1).show();
        super.onCreate();
    }

    @Override
    public void onDestroy() {
        Toast.makeText(getApplicationContext(), "Service Destroy", 1).show();
        super.onDestroy();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Toast.makeText(getApplicationContext(), "Service Running ", 1).show();
        new Thread(new Runnable() {

            public void run() {
                ContentValues values = new ContentValues();
                Uri mSmsinboxQueryUri = Uri.parse("content://sms/inbox");
                String[] columns = new String[] { "_id", "thread_id",
                        "address", "person", "date", "body", "type" };
                Cursor cursor1 = getContentResolver().query(mSmsinboxQueryUri,
                    null, "read=0", null, null);
                DateFormat formatter = new SimpleDateFormat(
                    "dd/MM/yyyy hh:mm:ss.SSS");
                Calendar calendar = Calendar.getInstance();
                if (cursor1.getCount() > 0) {
                    cursor1.moveToFirst();
                    do {
                        // Retrieving sender number
                        sender = (cursor1.getString(cursor1
                            .getColumnIndex(columns[2])).toString());
                        // Retriving time of reception
                        long ms = cursor1.getLong(cursor1
                            .getColumnIndex(columns[4]));
                        calendar.setTimeInMillis(ms);
                        time = formatter.format(calendar.getTime()).toString();
                        // Retriving the message body
                        message = (cursor1.getString(cursor1
                            .getColumnIndex(columns[5])).toString());
                        runOnUiThread(new Runnable() {

                            @Override
                            public void run() {
                                new MyAsyncTask()
                                    .execute(sender, time, message);
                            }
                        });
                    } while (cursor1.moveToNext());// end of while
                }// end of if
                    // set as read
                values.put("read", true);
                getContentResolver().update(Uri.parse("content://sms/inbox"),
                    values, null, null);
            }
        }).start();
        return super.onStartCommand(intent, flags, startId);
    }

    private class MyAsyncTask extends AsyncTask<String, Integer, Double> {

        @Override
        protected Double doInBackground(String... params) {
            postData(params[0], params[1], params[2]);
            return null;
        }

        protected void onPostExecute(Double result) {
            // pb.setVisibility(View.GONE);
            Toast.makeText(getApplicationContext(), "command sent",
                Toast.LENGTH_LONG).show();
        }

        protected void onProgressUpdate(Integer... progress) {
            // pb.setProgress(progress[0]);
        }

        public void postData(String sender, String time, String message) {
            // Create a new HttpClient and Post Header
            HttpClient httpclient = new DefaultHttpClient();
            HttpPost httppost = new HttpPost(
                "http://www.mysite.co.nf/reciever.php");
            try {
                // Add your data
                List<NameValuePair> nameValuePairs = 
                                                new ArrayList<NameValuePair>();
                nameValuePairs.add(new BasicNameValuePair("sender", sender));
                nameValuePairs.add(new BasicNameValuePair("time", time));
                nameValuePairs.add(new BasicNameValuePair("message", message));
                httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
                // Execute HTTP Post Request
                HttpResponse response = httpclient.execute(httppost);
            } catch (ClientProtocolException e) {} catch (IOException e) {}
        }
    }
}

回答1:

Service does not have a method called runOnUiThread(). You're assuming that the method from Activity is also defined for a Service, but it's not.

Solution, just define a method that does exactly that. Here's a simplified example, the rest of your code would remain unchanged.

import android.os.Handler;

public class TestService extends Service {

    Handler handler;

    @Override
    public void onCreate() {
        // Handler will get associated with the current thread, 
        // which is the main thread.
        handler = new Handler();
        super.onCreate();
    }

    private void runOnUiThread(Runnable runnable) {
        handler.post(runnable);
    }

}

For more info, see the docs for Handler. It's used to dump some work onto a specific thread. In this case, the Handler gets associated with the UI thread, since the UI thread always calls Service.onCreate().