Java tutorial
/* * Copyright (C) 2014 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 rocks.stalin.android.app.ui; import android.app.Activity; import android.content.Context; import android.content.res.ColorStateList; import android.graphics.drawable.AnimationDrawable; import android.graphics.drawable.Drawable; import android.support.v4.app.FragmentActivity; import android.support.v4.content.ContextCompat; import android.support.v4.graphics.drawable.DrawableCompat; import android.support.v4.media.MediaBrowserCompat; import android.support.v4.media.MediaDescriptionCompat; import android.support.v4.media.session.MediaControllerCompat; import android.support.v4.media.session.PlaybackStateCompat; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.TextView; import rocks.stalin.android.app.R; import rocks.stalin.android.app.utils.LogHelper; import rocks.stalin.android.app.utils.MediaIDHelper; public class MediaItemViewHolder { public static final int STATE_INVALID = -1; public static final int STATE_NONE = 0; public static final int STATE_PLAYABLE = 1; public static final int STATE_PAUSED = 2; public static final int STATE_PLAYING = 3; private static ColorStateList sColorStatePlaying; private static ColorStateList sColorStateNotPlaying; ImageView mImageView; TextView mTitleView; TextView mDescriptionView; // Returns a view for use in media item list. static View setupListView(Activity activity, View convertView, ViewGroup parent, MediaBrowserCompat.MediaItem item) { if (sColorStateNotPlaying == null || sColorStatePlaying == null) { initializeColorStateLists(activity); } MediaItemViewHolder holder; Integer cachedState = STATE_INVALID; if (convertView == null) { convertView = LayoutInflater.from(activity).inflate(R.layout.media_list_item, parent, false); holder = new MediaItemViewHolder(); holder.mImageView = (ImageView) convertView.findViewById(R.id.play_eq); holder.mTitleView = (TextView) convertView.findViewById(R.id.title); holder.mDescriptionView = (TextView) convertView.findViewById(R.id.description); convertView.setTag(holder); } else { holder = (MediaItemViewHolder) convertView.getTag(); cachedState = (Integer) convertView.getTag(R.id.tag_mediaitem_state_cache); } MediaDescriptionCompat description = item.getDescription(); holder.mTitleView.setText(description.getTitle()); holder.mDescriptionView.setText(description.getSubtitle()); if (item.isBrowsable() && description.getIconUri() != null) { holder.mImageView.setImageURI(description.getIconUri()); holder.mImageView.setVisibility(View.VISIBLE); return convertView; } // If the state of convertView is different, we need to adapt the view to the // new state. int state = getMediaItemState(activity, item); if (cachedState == null || cachedState != state) { Drawable drawable = getDrawableByState(activity, state); if (drawable != null) { holder.mImageView.setImageDrawable(drawable); holder.mImageView.setVisibility(View.VISIBLE); } else { holder.mImageView.setVisibility(View.GONE); } convertView.setTag(R.id.tag_mediaitem_state_cache, state); } return convertView; } private static void initializeColorStateLists(Context ctx) { sColorStateNotPlaying = ColorStateList .valueOf(ContextCompat.getColor(ctx, R.color.media_item_icon_not_playing)); sColorStatePlaying = ColorStateList.valueOf(ContextCompat.getColor(ctx, R.color.media_item_icon_playing)); } public static Drawable getDrawableByState(Context context, int state) { if (sColorStateNotPlaying == null || sColorStatePlaying == null) { initializeColorStateLists(context); } switch (state) { case STATE_PLAYABLE: Drawable pauseDrawable = ContextCompat.getDrawable(context, R.drawable.ic_play_arrow_black_36dp); DrawableCompat.setTintList(pauseDrawable, sColorStateNotPlaying); return pauseDrawable; case STATE_PLAYING: AnimationDrawable animation = (AnimationDrawable) ContextCompat.getDrawable(context, R.drawable.ic_equalizer_white_36dp); DrawableCompat.setTintList(animation, sColorStatePlaying); animation.start(); return animation; case STATE_PAUSED: Drawable playDrawable = ContextCompat.getDrawable(context, R.drawable.ic_equalizer1_white_36dp); DrawableCompat.setTintList(playDrawable, sColorStatePlaying); return playDrawable; default: return null; } } public static int getMediaItemState(Context context, MediaBrowserCompat.MediaItem mediaItem) { int state = STATE_NONE; // Set state to playable first, then override to playing or paused state if needed if (mediaItem.isPlayable()) { state = STATE_PLAYABLE; if (MediaIDHelper.isMediaItemPlaying(context, mediaItem)) { state = getStateFromController(context); } } return state; } public static int getStateFromController(Context context) { MediaControllerCompat controller = MediaControllerCompat.getMediaController((FragmentActivity) context); PlaybackStateCompat pbState = controller.getPlaybackState(); if (pbState == null || pbState.getState() == PlaybackStateCompat.STATE_ERROR) { return MediaItemViewHolder.STATE_NONE; } else if (pbState.getState() == PlaybackStateCompat.STATE_PLAYING) { return MediaItemViewHolder.STATE_PLAYING; } else { return MediaItemViewHolder.STATE_PAUSED; } } }