Java tutorial
package kkook.team.projectswitch.gcm; /** * Copyright 2015 Google Inc. All Rights Reserved. * <p/> * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * <p/> * http://www.apache.org/licenses/LICENSE-2.0 * <p/> * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.SharedPreferences; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.preference.PreferenceManager; import android.support.v4.content.LocalBroadcastManager; import android.support.v7.app.AppCompatActivity; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.ProgressBar; import android.widget.TextView; import com.google.android.gms.common.ConnectionResult; import com.google.android.gms.common.GoogleApiAvailability; import org.apache.commons.io.IOUtils; import org.json.JSONException; import org.json.JSONObject; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import kkook.team.projectswitch.R; public class TestActivity extends AppCompatActivity { private static final int PLAY_SERVICES_RESOLUTION_REQUEST = 9000; private static final String TAG = "TestActivity"; private BroadcastReceiver mRegistrationBroadcastReceiver; private ProgressBar mRegistrationProgressBar; private TextView mInformationTextView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_test_gcm); mRegistrationProgressBar = (ProgressBar) findViewById(R.id.registrationProgressBar); mRegistrationBroadcastReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { mRegistrationProgressBar.setVisibility(ProgressBar.GONE); SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context); boolean sentToken = sharedPreferences.getBoolean(QuickstartPreferences.SENT_TOKEN_TO_SERVER, false); if (sentToken) { mInformationTextView.setText( "Token retrieved and sent to server! You can now use gcmsender to send downstream messages to this app."); ((Button) findViewById(R.id.btnSend)).setVisibility(View.VISIBLE); ((EditText) findViewById(R.id.etMessage)).setVisibility(View.VISIBLE); } else { mInformationTextView.setText( "An error occurred while either fetching the InstanceID token, sending the fetched token to the server or subscribing to the PubSub topic. Please try running the sample again."); } } }; mInformationTextView = (TextView) findViewById(R.id.informationTextView); if (checkPlayServices()) { // Start IntentService to register this application with GCM. Intent intent = new Intent(this, RegistrationIntentService.class); startService(intent); ((Button) findViewById(R.id.btnSend)).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { new Thread(runSender).start(); } }); } } @Override protected void onResume() { super.onResume(); LocalBroadcastManager.getInstance(this).registerReceiver(mRegistrationBroadcastReceiver, new IntentFilter(QuickstartPreferences.REGISTRATION_COMPLETE)); } @Override protected void onPause() { LocalBroadcastManager.getInstance(this).unregisterReceiver(mRegistrationBroadcastReceiver); super.onPause(); } /** * Check the device to make sure it has the Google Play Services APK. If * it doesn't, display a dialog that allows users to download the APK from * the Google Play Store or enable it in the device's system settings. */ private boolean checkPlayServices() { GoogleApiAvailability apiAvailability = GoogleApiAvailability.getInstance(); int resultCode = apiAvailability.isGooglePlayServicesAvailable(this); if (resultCode != ConnectionResult.SUCCESS) { if (apiAvailability.isUserResolvableError(resultCode)) { apiAvailability.getErrorDialog(this, resultCode, PLAY_SERVICES_RESOLUTION_REQUEST).show(); } else { Log.i(TAG, "This device is not supported."); finish(); } return false; } return true; } private Runnable runSender = new Runnable() { @Override public void run() { String msg = ((EditText) findViewById(R.id.etMessage)).getText().toString(); try { // Prepare JSON containing the GCM message content. What to send and where to send. JSONObject jGcmData = new JSONObject(); JSONObject jData = new JSONObject(); jData.put("message", msg); // Where to send GCM message. // if (args.length > 1 && args[1] != null) { // jGcmData.put("to", args[1].trim()); // } else { jGcmData.put("to", "/topics/global"); // } // What to send in GCM message. jGcmData.put("data", jData); // Create connection to send GCM Message request. URL url = new URL("https://android.googleapis.com/gcm/send"); HttpURLConnection conn = null; conn = (HttpURLConnection) url.openConnection(); conn.setRequestProperty("Authorization", "key=" + getString(R.string.gcm_serverAPIKey)); conn.setRequestProperty("Content-Type", "application/json"); conn.setRequestMethod("POST"); conn.setDoOutput(true); // Send GCM message content. setTextInfo("Send this message= " + jGcmData.toString()); OutputStream outputStream = conn.getOutputStream(); outputStream.write(jGcmData.toString().getBytes()); // Read GCM response. InputStream inputStream = conn.getInputStream(); String resp = IOUtils.toString(inputStream); setTextInfo("Response of the server = " + resp + "\n" + "Check your device/emulator for notification or logcat for " + "confirmation of the receipt of the GCM message."); Log.i(TAG, resp); } catch (JSONException e) { e.printStackTrace(); } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } }; private Handler handlerTextInfo = new Handler() { @Override public void handleMessage(Message msg) { mInformationTextView.setText(msg.obj.toString()); } }; private void setTextInfo(String text) { handlerTextInfo.sendMessage(Message.obtain(handlerTextInfo, 0, text)); } }