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public void onClick(final View view) {
    if (view == findViewById(R.id.send)) {
        new AsyncTask<Void, Void, String>() {
            @Override
            protected String doInBackground(Void... params) {
                String msg = "";
                try {
                    Bundle data = new Bundle();
                        data.putString("my_message", "Hello World");
                        data.putString("my_action",
                                "com.google.android.gcm.demo.app.ECHO_NOW");
                        String id = Integer.toString(msgId.incrementAndGet());
                        gcm.send(SENDER_ID + "@gcm.googleapis.com", id, data);
                        msg = "Sent message";
                } catch (IOException ex) {
                    msg = "Error :" + ex.getMessage();
                }
                return msg;
            }

            @Override
            protected void onPostExecute(String msg) {
                mDisplay.append(msg + "\n");
            }
        }.execute(null, null, null);
    } else if (view == findViewById(R.id.clear)) {
        mDisplay.setText("");
    }
}