Initial checkin of AOSP Messaging app.

b/23110861

Change-Id: I9aa980d7569247d6b2ca78f5dcb4502e1eaadb8a

src/com/android/messaging/datamodel/data/MediaPickerData.java

@@ -0,0 +1,175 @@
+/*
+ * Copyright (C) 2015 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.android.messaging.datamodel.data;
+
+import android.app.LoaderManager;
+import android.content.Context;
+import android.content.Loader;
+import android.database.Cursor;
+import android.os.Bundle;
+import android.support.annotation.Nullable;
+
+import com.android.messaging.datamodel.BoundCursorLoader;
+import com.android.messaging.datamodel.GalleryBoundCursorLoader;
+import com.android.messaging.datamodel.binding.BindableData;
+import com.android.messaging.datamodel.binding.BindingBase;
+import com.android.messaging.util.Assert;
+import com.android.messaging.util.BuglePrefs;
+import com.android.messaging.util.BuglePrefsKeys;
+import com.android.messaging.util.LogUtil;
+
+/**
+ * Services data needs for MediaPicker.
+ */
+public class MediaPickerData extends BindableData {
+    public interface MediaPickerDataListener {
+        void onMediaPickerDataUpdated(MediaPickerData mediaPickerData, Object data, int loaderId);
+    }
+
+    private static final String BINDING_ID = "bindingId";
+    private final Context mContext;
+    private LoaderManager mLoaderManager;
+    private final GalleryLoaderCallbacks mGalleryLoaderCallbacks;
+    private MediaPickerDataListener mListener;
+
+    public MediaPickerData(final Context context) {
+        mContext = context;
+        mGalleryLoaderCallbacks = new GalleryLoaderCallbacks();
+    }
+
+    public static final int GALLERY_IMAGE_LOADER = 1;
+
+    /**
+     * A trampoline class so that we can inherit from LoaderManager.LoaderCallbacks multiple times.
+     */
+    private class GalleryLoaderCallbacks implements LoaderManager.LoaderCallbacks<Cursor> {
+        @Override
+        public Loader<Cursor> onCreateLoader(final int id, final Bundle args) {
+            final String bindingId = args.getString(BINDING_ID);
+            // Check if data still bound to the requesting ui element
+            if (isBound(bindingId)) {
+                switch (id) {
+                    case GALLERY_IMAGE_LOADER:
+                        return new GalleryBoundCursorLoader(bindingId, mContext);
+
+                    default:
+                        Assert.fail("Unknown loader id for gallery picker!");
+                        break;
+                }
+            } else {
+                LogUtil.w(LogUtil.BUGLE_TAG, "Loader created after unbinding the media picker");
+            }
+            return null;
+        }
+
+        /**
+         * {@inheritDoc}
+         */
+        @Override
+        public void onLoadFinished(final Loader<Cursor> loader, final Cursor data) {
+            final BoundCursorLoader cursorLoader = (BoundCursorLoader) loader;
+            if (isBound(cursorLoader.getBindingId())) {
+                switch (loader.getId()) {
+                    case GALLERY_IMAGE_LOADER:
+                        mListener.onMediaPickerDataUpdated(MediaPickerData.this, data,
+                                GALLERY_IMAGE_LOADER);
+                        break;
+
+                    default:
+                        Assert.fail("Unknown loader id for gallery picker!");
+                        break;
+                }
+            } else {
+                LogUtil.w(LogUtil.BUGLE_TAG, "Loader finished after unbinding the media picker");
+            }
+        }
+
+        /**
+         * {@inheritDoc}
+         */
+        @Override
+        public void onLoaderReset(final Loader<Cursor> loader) {
+            final BoundCursorLoader cursorLoader = (BoundCursorLoader) loader;
+            if (isBound(cursorLoader.getBindingId())) {
+                switch (loader.getId()) {
+                    case GALLERY_IMAGE_LOADER:
+                        mListener.onMediaPickerDataUpdated(MediaPickerData.this, null,
+                                GALLERY_IMAGE_LOADER);
+                        break;
+
+                    default:
+                        Assert.fail("Unknown loader id for media picker!");
+                        break;
+                }
+            } else {
+                LogUtil.w(LogUtil.BUGLE_TAG, "Loader reset after unbinding the media picker");
+            }
+        }
+    }
+
+
+
+    public void startLoader(final int loaderId, final BindingBase<MediaPickerData> binding,
+            @Nullable Bundle args, final MediaPickerDataListener listener) {
+        if (args == null) {
+            args = new Bundle();
+        }
+        args.putString(BINDING_ID, binding.getBindingId());
+        if (loaderId == GALLERY_IMAGE_LOADER) {
+            mLoaderManager.initLoader(loaderId, args, mGalleryLoaderCallbacks).forceLoad();
+        } else {
+            Assert.fail("Unsupported loader id for media picker!");
+        }
+        mListener = listener;
+    }
+
+    public void destroyLoader(final int loaderId) {
+        mLoaderManager.destroyLoader(loaderId);
+    }
+
+    public void init(final LoaderManager loaderManager) {
+        mLoaderManager = loaderManager;
+    }
+
+    @Override
+    protected void unregisterListeners() {
+        // This could be null if we bind but the caller doesn't init the BindableData
+        if (mLoaderManager != null) {
+            mLoaderManager.destroyLoader(GALLERY_IMAGE_LOADER);
+            mLoaderManager = null;
+        }
+    }
+
+    /**
+     * Gets the last selected chooser index, or -1 if no selection has been saved.
+     */
+    public int getSelectedChooserIndex() {
+        return BuglePrefs.getApplicationPrefs().getInt(
+                BuglePrefsKeys.SELECTED_MEDIA_PICKER_CHOOSER_INDEX,
+                BuglePrefsKeys.SELECTED_MEDIA_PICKER_CHOOSER_INDEX_DEFAULT);
+    }
+
+    /**
+     * Saves the selected media chooser index.
+     * @param selectedIndex the selected media chooser index.
+     */
+    public void saveSelectedChooserIndex(final int selectedIndex) {
+        BuglePrefs.getApplicationPrefs().putInt(BuglePrefsKeys.SELECTED_MEDIA_PICKER_CHOOSER_INDEX,
+                selectedIndex);
+    }
+
+}