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.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.net.URI; import java.net.URISyntaxException; import org.apache.http.HttpResponse; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.DefaultHttpClient; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.os.Bundle; import android.util.Log; import android.view.Gravity; import android.view.View; import android.view.View.OnClickListener; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.EditText; import android.widget.Spinner; import android.widget.TextView; import android.widget.Toast; import com.facebook.android.SessionEvents.AuthListener; import com.facebook.android.SessionEvents.LogoutListener; public class MainPage 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 = "412014455537871"; private TextView mText; private Button mRequestButton; private Button mPostButton; private Button mDeleteButton; private Button mUploadButton; private Button mSearchButton; private Spinner mMediaSpinner; private EditText mMovieNameInput; private static Facebook mFacebook; private static 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); mMovieNameInput = (EditText) findViewById(R.id.title); mMediaSpinner = (Spinner) findViewById(R.id.media); mSearchButton = (Button) findViewById(R.id.search); mFacebook = new Facebook(APP_ID); mAsyncRunner = new AsyncFacebookRunner(mFacebook); SessionStore.restore(mFacebook, this); SessionEvents.addAuthListener(new SampleAuthListener()); SessionEvents.addLogoutListener(new SampleLogoutListener()); // set up the Spinner for the media list selection ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.media_list, android.R.layout.simple_spinner_item); adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); mMediaSpinner.setAdapter(adapter); //for search button final Context context = this; mSearchButton.setOnClickListener(new OnClickListener() { public void onClick(View v) { String servletURL; String movieName = mMovieNameInput.getText().toString(); // check the input text of movie, if the text is empty give user alert movieName = movieName.trim(); if (movieName.length() == 0) { Toast toast = Toast.makeText(context, "Please enter a movie name", Toast.LENGTH_LONG); toast.setGravity(Gravity.TOP | Gravity.CENTER, 0, 70); toast.show(); } // if movie name is not empty else { // remove any extra whitespace movieName = movieName.replaceAll("\\s+", "+"); String mediaList = mMediaSpinner.getSelectedItem().toString(); if (mediaList.equals("Feature Film")) { mediaList = "feature"; } mediaList = mediaList.replaceAll("\\s+", "+"); // construct the query string // construct the final URL to Servlet //String servletString = "?" + "title=" + movieName + "&" + "title_type=" + mediaList; //servletURL = "http://cs-server.usc.edu:10854/examples/servlet/Amovie" //+ servletString; //String servletString = "?" + "title=" + movieName + "&" + "media=" + mediaList; //servletURL = "http://cs-server.usc.edu:34404/examples/servlet/HelloWorldExample?title=" + movieName + "&" + "media=" + mediaList; //+ servletString; servletURL = "http://cs-server.usc.edu:10854/examples/servlet/Amovie?title=" + movieName + "&" + "title_type=" + mediaList; BufferedReader in = null; try { // REFERENCE: this part of code is modified from: // "Example of HTTP GET Request using HttpClient in Android" // http://w3mentor.com/learn/java/android-development/android-http-services/example-of-http-get-request-using-httpclient-in-android/ // get response (JSON string) from Servlet HttpClient client = new DefaultHttpClient(); HttpGet request = new HttpGet(); request.setURI(new URI(servletURL)); HttpResponse response = client.execute(request); in = new BufferedReader(new InputStreamReader(response.getEntity().getContent())); StringBuffer sb = new StringBuffer(""); String line = ""; String NL = System.getProperty("line.separator"); while ((line = in.readLine()) != null) { sb.append(line + NL); } in.close(); String page = sb.toString(); //test for JSON string /*LinearLayout lView = new LinearLayout(context); TextView myText = new TextView(context); myText.setText(page); lView.addView(myText); setContentView(lView);*/ // convert the JSON string to real JSON and get out the movie JSON array // to check if there is any movie data JSONObject finalJson; JSONObject movieJson; JSONArray movieJsonArray; finalJson = new JSONObject(page); movieJson = finalJson.getJSONObject("results"); //System.out.println(movieJson); movieJsonArray = movieJson.getJSONArray("result"); // if the response contains some movie data if (movieJsonArray.length() != 0) { // start the ListView activity, and pass the JSON string to it Intent intent = new Intent(context, MovieListActivity.class); intent.putExtra("finalJson", page); startActivity(intent); } // if the response does not contain any movie data, // show user that there is no result for this search else { Toast toast = Toast.makeText(getBaseContext(), "No movie found for this search", Toast.LENGTH_LONG); toast.setGravity(Gravity.CENTER, 0, 0); toast.show(); } } catch (URISyntaxException e) { e.printStackTrace(); } catch (ClientProtocolException e) { e.printStackTrace(); } catch (JSONException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { if (in != null) { try { in.close(); } catch (IOException e) { e.printStackTrace(); } } } } } }); } @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." MainPage.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." MainPage.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; MainPage.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"); MainPage.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"); } } } public static Facebook getFacebook() { return mFacebook; } public static AsyncFacebookRunner getAsyncRunner() { return mAsyncRunner; } }