Java tutorial
/* * Copyright 2012 The Android Open Source Project * * 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 * * http://www.apache.org/licenses/LICENSE-2.0 * * 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. */ package com.ttl.googleplus; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.net.HttpURLConnection; import java.net.URL; import org.json.JSONException; import org.json.JSONObject; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.net.Uri; import android.os.AsyncTask; import android.util.Log; import android.widget.ImageView; import com.google.android.gms.auth.GoogleAuthUtil; import com.google.android.gms.plus.PlusShare; /** * Display personalized greeting. This class contains boilerplate code to consume the token but * isn't integral to getting the tokens. */ public abstract class AbstractGetNameTask extends AsyncTask<Void, Void, Void> { private static final String TAG = "TokenInfoTask"; private static final String NAME_KEY = "given_name"; protected MainActivity mActivity; protected String mScope; protected String mEmail; AbstractGetNameTask(MainActivity activity, String email, String scope) { this.mActivity = activity; this.mScope = scope; this.mEmail = email; } @Override protected Void doInBackground(Void... params) { try { fetchNameFromProfileServer(); } catch (IOException ex) { onError("Following Error occured, please try again. " + ex.getMessage(), ex); } catch (JSONException e) { onError("Bad response: " + e.getMessage(), e); } return null; } protected void onError(String msg, Exception e) { if (e != null) { Log.e(TAG, "Exception: ", e); } mActivity.show(msg); // will be run in UI thread } /** * Get a authentication token if one is not available. If the error is not recoverable then * it displays the error message on parent activity. */ protected abstract String fetchToken() throws IOException; /** * Contacts the user info server to get the profile of the user and extracts the first name * of the user from the profile. In order to authenticate with the user info server the method * first fetches an access token from Google Play services. * @throws IOException if communication with user info server failed. * @throws JSONException if the response from the server could not be parsed. */ private void fetchNameFromProfileServer() throws IOException, JSONException { String token = fetchToken(); if (token == null) { // error has already been handled in fetchToken() return; } URL url = new URL("https://www.googleapis.com/oauth2/v1/userinfo?access_token=" + token); HttpURLConnection con = (HttpURLConnection) url.openConnection(); int sc = con.getResponseCode(); if (sc == 200) { InputStream is = con.getInputStream(); String name = getFirstName(readResponse(is)); Log.d("profile data", readResponse(is)); mActivity.show("Hello " + name + "!"); is.close(); return; } else if (sc == 401) { GoogleAuthUtil.invalidateToken(mActivity, token); onError("Server auth error, please try again.", null); Log.i(TAG, "Server auth error: " + readResponse(con.getErrorStream())); return; } else { onError("Server returned the following error code: " + sc, null); return; } } /** * Reads the response from the input stream and returns it as a string. */ private static String readResponse(InputStream is) throws IOException { ByteArrayOutputStream bos = new ByteArrayOutputStream(); byte[] data = new byte[2048]; int len = 0; while ((len = is.read(data, 0, data.length)) >= 0) { bos.write(data, 0, len); } Log.d("User Profile Data", new String(bos.toByteArray(), "UTF-8")); return new String(bos.toByteArray(), "UTF-8"); } /** * Parses the response and returns the first name of the user. * @throws JSONException if the response is not JSON or if first name does not exist in response */ private String getFirstName(String jsonResponse) throws JSONException { JSONObject profile = new JSONObject(jsonResponse); Log.d("User Profile Information ***>>", profile.getString("id") + "\n" + profile.getString("name") + "\n" + profile.getString("gender") + "\n" + profile.getString("given_name") + "\n" + profile.getString("link") + "\n" + profile.getString("locale") + "\n" + profile.getString("family_name") + "\n" + profile.getString("picture") + "\n" + mEmail); new DownloadImageTask(MainActivity.imgProfilePic).execute(profile.getString("picture")); // ### Fetch user image from profile Intent shareIntent = new PlusShare.Builder(MainActivity.m).setType("text/plain") .setText("Checkout Tata Motors Commercial...") .setContentUrl(Uri.parse("https://www.youtube.com/watch?v=sD_ixDRrX3s")).getIntent(); MainActivity.m.startActivityForResult(shareIntent, 0); return profile.getString(NAME_KEY); } // ### Fetch Profile Image private class DownloadImageTask extends AsyncTask<String, Void, Bitmap> { ImageView bmImage; public DownloadImageTask(ImageView bmImage) { this.bmImage = bmImage; } protected Bitmap doInBackground(String... urls) { String urldisplay = urls[0]; Bitmap mIcon11 = null; try { InputStream in = new java.net.URL(urldisplay).openStream(); mIcon11 = BitmapFactory.decodeStream(in); } catch (Exception e) { Log.e("Error", e.getMessage()); e.printStackTrace(); } return mIcon11; } protected void onPostExecute(Bitmap result) { bmImage.setImageBitmap(result); } } }