Android : 04-TheFragmentClass: add

4 files changed, 248 insertions, 0 deletions

diff --git a/Android/04-TheFragmentClass/FragmentsLab/src/course/labs/fragmentslab/FeedFragment.java b/Android/04-TheFragmentClass/FragmentsLab/src/course/labs/fragmentslab/FeedFragment.java
new file mode 100644
index 0000000..50562a1
--- /dev/null
+++ b/Android/04-TheFragmentClass/FragmentsLab/src/course/labs/fragmentslab/FeedFragment.java
@@ -0,0 +1,38 @@
+package course.labs.fragmentslab;
+
+import android.app.Fragment;
+import android.os.Bundle;
+import android.util.Log;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+public class FeedFragment extends Fragment {
+
+    private static final String TAG = "Lab-Fragments";
+
+    private TextView mTextView;
+    private static FeedFragmentData feedFragmentData;
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+        return inflater.inflate(R.layout.feed, container, false);
+    }
+
+    @Override
+    public void onActivityCreated(Bundle savedInstanceState) {
+        super.onActivityCreated(savedInstanceState);
+        // Read in all Twitter feeds
+        if (null == feedFragmentData) {
+            feedFragmentData = new FeedFragmentData(getActivity());
+        }
+    }
+
+    // Display Twitter feed for selected feed
+    void updateFeedDisplay(int position) {
+        Log.i(TAG, "Entered updateFeedDisplay()");
+        mTextView = (TextView) getView().findViewById(R.id.feed_view);
+        mTextView.setText(feedFragmentData.getFeed(position));
+    }
+}
diff --git a/Android/04-TheFragmentClass/FragmentsLab/src/course/labs/fragmentslab/FeedFragmentData.java b/Android/04-TheFragmentClass/FragmentsLab/src/course/labs/fragmentslab/FeedFragmentData.java
new file mode 100644
index 0000000..fb09cae
--- /dev/null
+++ b/Android/04-TheFragmentClass/FragmentsLab/src/course/labs/fragmentslab/FeedFragmentData.java
@@ -0,0 +1,83 @@
+package course.labs.fragmentslab;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import android.content.Context;
+import android.util.Log;
+import android.util.SparseArray;
+
+// Utility class that provides stored Twitter feed data
+public class FeedFragmentData {
+    private static final String TAG = "FeedFragmentData";
+    private static final int[] IDS = { R.raw.ladygaga, R.raw.rebeccablack, R.raw.taylorswift };
+
+    private SparseArray<String> mFeeds = new SparseArray<String>();
+    private Context mContext;
+
+
+    public FeedFragmentData(Context context) {
+        mContext = context;
+        loadFeeds();
+    }
+
+    // Load all stored Twitter feeds into the mFeeds SparseArray.
+    private void loadFeeds() {
+        for (int id : IDS) {
+            InputStream inputStream = mContext.getResources().openRawResource(id);
+            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
+            StringBuffer buffer = new StringBuffer("");
+
+            // Read raw data from resource file
+            try {
+                String line = "";
+                while ((line = reader.readLine()) != null) {
+                    buffer.append(line);
+                }
+            } catch (IOException e) {
+                Log.i(TAG, "IOException");
+            }
+
+            // Convert raw data into a String
+            JSONArray feed = null;
+            try {
+                feed = new JSONArray(buffer.toString());
+            } catch (JSONException e) {
+                Log.i(TAG, "JSONException");
+            }
+            mFeeds.put(id, procFeed(feed));
+        }
+    }
+
+    // Convert JSON formatted data to a String
+    private String procFeed(JSONArray feed) {
+        String name = "";
+        String tweet = "";
+
+        // string buffer for twitter feeds
+        StringBuffer textFeed = new StringBuffer("");
+
+        for (int j = 0; j < feed.length(); j++) {
+            try {
+                tweet = feed.getJSONObject(j).getString("text");
+                JSONObject user = (JSONObject) feed.getJSONObject(j).get("user");
+                name = user.getString("name");
+            } catch (JSONException e) {
+                Log.i(TAG, "JSONException while processing feed");
+            }
+            textFeed.append(name + " - " + tweet + "\n\n");
+        }
+        return textFeed.toString();
+    }
+
+    // Return the Twitter feed data for the specified position as a single String
+    String getFeed (int position) {
+        return mFeeds.get(IDS[position]);
+    }
+}
diff --git a/Android/04-TheFragmentClass/FragmentsLab/src/course/labs/fragmentslab/FriendsFragment.java b/Android/04-TheFragmentClass/FragmentsLab/src/course/labs/fragmentslab/FriendsFragment.java
new file mode 100644
index 0000000..3d18ee6
--- /dev/null
+++ b/Android/04-TheFragmentClass/FragmentsLab/src/course/labs/fragmentslab/FriendsFragment.java
@@ -0,0 +1,75 @@
+package course.labs.fragmentslab;
+
+import android.app.Activity;
+import android.app.ListFragment;
+import android.os.Build;
+import android.os.Bundle;
+import android.util.Log;
+import android.view.View;
+import android.widget.ArrayAdapter;
+import android.widget.ListView;
+
+public class FriendsFragment extends ListFragment {
+
+    private static final String[] FRIENDS = { "ladygaga", "msrebeccablack", "taylorswift13" };
+    private static final String TAG = "Lab-Fragments";
+
+    public interface SelectionListener {
+        public void onItemSelected(int position);
+    }
+
+    private SelectionListener mCallback;
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        // use different layout definition, depending on whether device is pre-
+        // or post-honeycomb
+        int layout = Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB ? android.R.layout.simple_list_item_activated_1 : android.R.layout.simple_list_item_1;
+        // Set the list adapter for this ListFragment
+        setListAdapter(new ArrayAdapter<String>(getActivity(), layout, FRIENDS));
+    }
+
+    @Override
+    public void onAttach(Activity activity) {
+        super.onAttach(activity);
+        // Make sure that the hosting Activity has implemented
+        // the SelectionListener callback interface. We need this
+        // because when an item in this ListFragment is selected,
+        // the hosting Activity's onItemSelected() method will be called.
+        try {
+            mCallback = (SelectionListener) activity;
+
+        } catch (ClassCastException e) {
+            throw new ClassCastException(activity.toString() + " must implement SelectionListener");
+        }
+    }
+
+    // Note: ListFragments come with a default onCreateView() method.
+    // For other Fragments you'll normally implement this method.
+    // @Override
+    //  public View onCreateView(LayoutInflater inflater, ViewGroup container,
+    //  Bundle savedInstanceState)
+
+    @Override
+    public void onActivityCreated(Bundle savedInstanceState) {
+        super.onActivityCreated(savedInstanceState);
+        Log.i(TAG, "Entered onActivityCreated()");
+        // When using two-pane layout, configure the ListView to highlight the
+        // selected list item
+        if (isInTwoPaneMode()) {
+            getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);
+        }
+    }
+
+    @Override
+    public void onListItemClick(ListView l, View view, int position, long id) {
+        // Notify the hosting Activity that a selection has been made.
+        mCallback.onItemSelected(position);
+    }
+
+    // If there is a FeedFragment, then the layout is two-pane
+    private boolean isInTwoPaneMode() {
+        return getFragmentManager().findFragmentById(R.id.feed_frag) != null;
+    }
+}
diff --git a/Android/04-TheFragmentClass/FragmentsLab/src/course/labs/fragmentslab/MainActivity.java b/Android/04-TheFragmentClass/FragmentsLab/src/course/labs/fragmentslab/MainActivity.java
new file mode 100644
index 0000000..6309bae
--- /dev/null
+++ b/Android/04-TheFragmentClass/FragmentsLab/src/course/labs/fragmentslab/MainActivity.java
@@ -0,0 +1,52 @@
+package course.labs.fragmentslab;
+
+import android.app.Activity;
+import android.app.FragmentTransaction;
+import android.os.Bundle;
+import android.util.Log;
+
+public class MainActivity extends Activity implements
+FriendsFragment.SelectionListener {
+
+    private static final String TAG = "Lab-Fragments";
+
+    private FriendsFragment mFriendsFragment;
+    private FeedFragment mFeedFragment;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.main_activity);
+        // If the layout is single-pane, create the FriendsFragment
+        // and add it to the Activity
+        if (!isInTwoPaneMode()) {
+            mFriendsFragment = new FriendsFragment();
+            //TODO 1 - add the FriendsFragment to the fragment_container
+        } else {
+            // Otherwise, save a reference to the FeedFragment for later use
+            mFeedFragment = (FeedFragment) getFragmentManager().findFragmentById(R.id.feed_frag);
+        }
+    }
+
+    // If there is no fragment_container ID, then the application is in
+    // two-pane mode
+    private boolean isInTwoPaneMode() {
+        return findViewById(R.id.fragment_container) == null;
+    }
+
+    // Display selected Twitter feed
+    public void onItemSelected(int position) {
+        Log.i(TAG, "Entered onItemSelected(" + position + ")");
+        // If there is no FeedFragment instance, then create one
+        if (mFeedFragment == null)
+            mFeedFragment = new FeedFragment();
+        // If in single-pane mode, replace single visible Fragment
+        if (!isInTwoPaneMode()) {
+            //TODO 2 - replace the fragment_container with the FeedFragment
+            // execute transaction now
+            getFragmentManager().executePendingTransactions();
+        }
+        // Update Twitter feed display on FriendFragment
+        mFeedFragment.updateFeedDisplay(position);
+    }
+}