How to replace the system.out with Toasts inside a thread [duplicate]

Question

How to add a toast method inside a thread. I want to debug by replacing the system.out with a toast method to display results to the display.

I know that using the application Context from within the thread, like so: Toast.makeText(getApplicationContext(), "help", Toast.LENGTH_LONG).show(); will not work.

I don't know how to use the Runnable with the Toast call and calling runOnUiThread(runnable) from the Thread

Could someone help me out.

public class NetworkServer extends Thread { DatagramSocket mSocket = null; boolean isFinish = false; private SimplestPossibleActivity activity; public NetworkServer(SimplestPossibleActivity activity) { this.activity = activity; } public void run() { try { Log.d("UDP", "Listening"); mSocket = new DatagramSocket( 2010); //4444 mSocket.setBroadcast(true); while (!isFinish) { Log.d("UDP", "C: socket create success"); byte[] recvbuffer = new byte[12]; DatagramPacket packet = new DatagramPacket(recvbuffer,recvbuffer.length); Log.d("UDP", "receiving..."); mSocket.receive(packet); Log.d("UDP", "received packet"); ByteBuffer bb = ByteBuffer.allocate(recvbuffer.length).order(ByteOrder.LITTLE_ENDIAN); bb.put(recvbuffer); bb.rewind(); //System.out.println(bb.getFloat()); //System.out.println(bb.getFloat()); //System.out.println(bb.getFloat()); Bundle data = new Bundle(); data.putFloat("latitude", bb.getFloat()); data.putFloat("longitude", bb.getFloat()); data.putFloat("altitude", bb.getFloat()); Message msgHandle = new Message(); msgHandle.setData(data); mhandler.sendMessage(msgHandle); } //end while } catch (Exception e) { Log.e("UDP", "C: Error", e); } } private Handler mhandler = new Handler() { @Override public void handleMessage(Message msg) { Bundle data = msg.getData(); Log.d("NetworkServer","adding position" + "lat = " + data.getFloat("latitude") + "lon = " + data.getFloat("longitude") + "alt = " + data.getFloat("altitude")); activity.addPosition(data.getFloat("latitude"), data.getFloat("longitude"), data.getFloat("altitude")); } }; }

you can use runOnuiThread. But runOnuiThread is a method of activity class. you cannot update ui on the background thread. ui should be updated on the ui thread — Raghunandan
– Raghunandan, Commented Aug 16, 2013 at 18:39
you cannot show toast on worker thread. You can only use Handler, runOnUiThread() or AsyncTask. — Simon Dorociak
– Simon Dorociak, Commented Aug 16, 2013 at 19:52

Oleksii K. · Accepted Answer · 2015-04-14 10:57:11Z

Use library Xdroid:

dependencies { compile 'com.shamanland:xdroid-toaster:0.2.4' }

There are quite good approaches:

Context variable is not required.
runOnUiThread() is not required.

Just invoke the single method!

// using the resource string Toaster.toast(R.string.my_msg); // or hard-coded string Toaster.toast("Hello Xdroid!");

There are more examples here: https://github.com/shamanland/xdroid-toaster-example

Marc-André Therrien · Accepted Answer · 2013-08-16 18:41:45Z

You can do it like this
Handler handler = new Handler(); //Before your Thread

 //Within your thread handler.post(new Runnable(){ public void run() { Toast.makeText(getApplicationContext(), "help", Toast.LENGTH_LONG).show(); } });

This works only if the handler is started on the main thread.

MrTristan · Accepted Answer · 2013-08-16 19:47:20Z

 runOnUiThread(new Runnable() { @Override public void run() { try { //pick one: //if activity Toast.makeText(YOURACTIVITYNAME.this, "help", Toast.LENGTH_LONG).show(); //if fragment Toast.makeText(getActivity(), "help", Toast.LENGTH_LONG).show(); } catch (final Exception e) { } } });

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