Java tutorial
/* * Copyright 2010 Facebook, Inc. * * 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.facebook.android; import java.io.IOException; import java.io.InputStream; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import org.json.JSONException; import org.json.JSONObject; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.TextView; import com.facebook.android.SessionEvents.AuthListener; import com.facebook.android.SessionEvents.LogoutListener; public class Example extends Activity { // Your Facebook Application ID must be set before running this example // See http://www.facebook.com/developers/createapp.php public static final String APP_ID = "175729095772478"; private LoginButton mLoginButton; private TextView mText; private Button mRequestButton; private Button mPostButton; private Button mDeleteButton; private Button mUploadButton; private Facebook mFacebook; private AsyncFacebookRunner mAsyncRunner; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); if (APP_ID == null) { Util.showAlert(this, "Warning", "Facebook Applicaton ID must be " + "specified before running this example: see Example.java"); } setContentView(R.layout.main); mLoginButton = (LoginButton) findViewById(R.id.login); mText = (TextView) Example.this.findViewById(R.id.txt); mRequestButton = (Button) findViewById(R.id.requestButton); mPostButton = (Button) findViewById(R.id.postButton); mDeleteButton = (Button) findViewById(R.id.deletePostButton); mUploadButton = (Button) findViewById(R.id.uploadButton); mFacebook = new Facebook(APP_ID); mAsyncRunner = new AsyncFacebookRunner(mFacebook); SessionStore.restore(mFacebook, this); SessionEvents.addAuthListener(new SampleAuthListener()); SessionEvents.addLogoutListener(new SampleLogoutListener()); mLoginButton.init(this, mFacebook); mRequestButton.setOnClickListener(new OnClickListener() { public void onClick(View v) { mAsyncRunner.request("me", new SampleRequestListener()); } }); mRequestButton.setVisibility(mFacebook.isSessionValid() ? View.VISIBLE : View.INVISIBLE); mUploadButton.setOnClickListener(new OnClickListener() { public void onClick(View v) { Bundle params = new Bundle(); params.putString("method", "photos.upload"); URL uploadFileUrl = null; try { uploadFileUrl = new URL("http://www.facebook.com/images/devsite/iphone_connect_btn.jpg"); } catch (MalformedURLException e) { e.printStackTrace(); } try { HttpURLConnection conn = (HttpURLConnection) uploadFileUrl.openConnection(); conn.setDoInput(true); conn.connect(); int length = conn.getContentLength(); byte[] imgData = new byte[length]; InputStream is = conn.getInputStream(); is.read(imgData); params.putByteArray("picture", imgData); } catch (IOException e) { e.printStackTrace(); } mAsyncRunner.request(null, params, "POST", new SampleUploadListener(), null); } }); mUploadButton.setVisibility(mFacebook.isSessionValid() ? View.VISIBLE : View.INVISIBLE); mPostButton.setOnClickListener(new OnClickListener() { public void onClick(View v) { mFacebook.dialog(Example.this, "feed", new SampleDialogListener()); } }); mPostButton.setVisibility(mFacebook.isSessionValid() ? View.VISIBLE : View.INVISIBLE); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { mFacebook.authorizeCallback(requestCode, resultCode, data); } public class SampleAuthListener implements AuthListener { public void onAuthSucceed() { mText.setText("You have logged in! "); mRequestButton.setVisibility(View.VISIBLE); mUploadButton.setVisibility(View.VISIBLE); mPostButton.setVisibility(View.VISIBLE); } public void onAuthFail(String error) { mText.setText("Login Failed: " + error); } } public class SampleLogoutListener implements LogoutListener { public void onLogoutBegin() { mText.setText("Logging out..."); } public void onLogoutFinish() { mText.setText("You have logged out! "); mRequestButton.setVisibility(View.INVISIBLE); mUploadButton.setVisibility(View.INVISIBLE); mPostButton.setVisibility(View.INVISIBLE); } } public class SampleRequestListener extends BaseRequestListener { public void onComplete(final String response, final Object state) { try { // process the response here: executed in background thread Log.d("Facebook-Example", "Response: " + response.toString()); JSONObject json = Util.parseJson(response); final String name = json.getString("name"); // then post the processed result back to the UI thread // if we do not do this, an runtime exception will be generated // e.g. "CalledFromWrongThreadException: Only the original // thread that created a view hierarchy can touch its views." Example.this.runOnUiThread(new Runnable() { public void run() { mText.setText("Hello there, " + name + "!"); } }); } catch (JSONException e) { Log.w("Facebook-Example", "JSON Error in response"); } catch (FacebookError e) { Log.w("Facebook-Example", "Facebook Error: " + e.getMessage()); } } } public class SampleUploadListener extends BaseRequestListener { public void onComplete(final String response, final Object state) { try { // process the response here: (executed in background thread) Log.d("Facebook-Example", "Response: " + response.toString()); JSONObject json = Util.parseJson(response); final String src = json.getString("src"); // then post the processed result back to the UI thread // if we do not do this, an runtime exception will be generated // e.g. "CalledFromWrongThreadException: Only the original // thread that created a view hierarchy can touch its views." Example.this.runOnUiThread(new Runnable() { public void run() { mText.setText("Hello there, photo has been uploaded at \n" + src); } }); } catch (JSONException e) { Log.w("Facebook-Example", "JSON Error in response"); } catch (FacebookError e) { Log.w("Facebook-Example", "Facebook Error: " + e.getMessage()); } } } public class WallPostRequestListener extends BaseRequestListener { public void onComplete(final String response, final Object state) { Log.d("Facebook-Example", "Got response: " + response); String message = "<empty>"; try { JSONObject json = Util.parseJson(response); message = json.getString("message"); } catch (JSONException e) { Log.w("Facebook-Example", "JSON Error in response"); } catch (FacebookError e) { Log.w("Facebook-Example", "Facebook Error: " + e.getMessage()); } final String text = "Your Wall Post: " + message; Example.this.runOnUiThread(new Runnable() { public void run() { mText.setText(text); } }); } } public class WallPostDeleteListener extends BaseRequestListener { public void onComplete(final String response, final Object state) { if (response.equals("true")) { Log.d("Facebook-Example", "Successfully deleted wall post"); Example.this.runOnUiThread(new Runnable() { public void run() { mDeleteButton.setVisibility(View.INVISIBLE); mText.setText("Deleted Wall Post"); } }); } else { Log.d("Facebook-Example", "Could not delete wall post"); } } } public class SampleDialogListener extends BaseDialogListener { public void onComplete(Bundle values) { final String postId = values.getString("post_id"); if (postId != null) { Log.d("Facebook-Example", "Dialog Success! post_id=" + postId); mAsyncRunner.request(postId, new WallPostRequestListener()); mDeleteButton.setOnClickListener(new OnClickListener() { public void onClick(View v) { mAsyncRunner.request(postId, new Bundle(), "DELETE", new WallPostDeleteListener(), null); } }); mDeleteButton.setVisibility(View.VISIBLE); } else { Log.d("Facebook-Example", "No wall post made"); } } } }