Java tutorial
/* * Copyright (C) 2014 Michell Bak * * 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.miz.mizuu.fragments; import android.content.Context; import android.graphics.Bitmap.Config; import android.os.AsyncTask; import android.os.Bundle; import android.support.v4.app.ActivityCompat; import android.support.v4.app.ActivityOptionsCompat; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.ViewTreeObserver; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.BaseAdapter; import android.widget.GridView; import android.widget.ImageView; import android.widget.ProgressBar; import android.widget.TextView; import com.miz.abstractclasses.MovieApiService; import com.miz.functions.Actor; import com.miz.functions.CoverItem; import com.miz.mizuu.MizuuApplication; import com.miz.mizuu.R; import com.miz.utils.IntentUtils; import com.miz.utils.TypefaceUtils; import com.squareup.picasso.Picasso; import java.util.ArrayList; public class ActorBrowserFragment extends Fragment { private int mImageThumbSize, mImageThumbSpacing; private ArrayList<Actor> mActors = new ArrayList<Actor>(); private GridView mGridView = null; private ProgressBar mProgressBar; private Picasso mPicasso; private Config mConfig; private boolean mLoaded = false; private ImageAdapter mAdapter; private View mEmptyView; /** * Empty constructor as per the Fragment documentation */ public ActorBrowserFragment() { } public static ActorBrowserFragment newInstance(String movieId) { ActorBrowserFragment pageFragment = new ActorBrowserFragment(); Bundle bundle = new Bundle(); bundle.putString("movieId", movieId); pageFragment.setArguments(bundle); return pageFragment; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setRetainInstance(true); mImageThumbSize = getResources().getDimensionPixelSize(R.dimen.image_thumbnail_size); mImageThumbSpacing = getResources().getDimensionPixelSize(R.dimen.image_thumbnail_spacing); mPicasso = MizuuApplication.getPicasso(getActivity()); mConfig = MizuuApplication.getBitmapConfig(); mAdapter = new ImageAdapter(getActivity()); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { return inflater.inflate(R.layout.image_grid_fragment, container, false); } @Override public void onViewCreated(View v, Bundle savedInstanceState) { super.onViewCreated(v, savedInstanceState); mEmptyView = v.findViewById(R.id.empty_library_layout); mProgressBar = (ProgressBar) v.findViewById(R.id.progress); mProgressBar.setVisibility(View.GONE); mGridView = (GridView) v.findViewById(R.id.gridView); mGridView.setAdapter(mAdapter); mGridView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() { @Override public void onGlobalLayout() { final int numColumns = (int) Math .floor(mGridView.getWidth() / (mImageThumbSize + mImageThumbSpacing)); if (numColumns > 0) { mGridView.setNumColumns(numColumns); } } }); mGridView.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { ActivityOptionsCompat options = ActivityOptionsCompat.makeSceneTransitionAnimation(getActivity(), arg1.findViewById(R.id.cover), "cover"); ActivityCompat.startActivity(getActivity(), IntentUtils.getActorIntent(getActivity(), mActors.get(arg2)), options.toBundle()); } }); // "No actors" message TextView title = (TextView) v.findViewById(R.id.empty_library_title); title.setText(R.string.no_actors); TextView description = (TextView) v.findViewById(R.id.empty_library_description); description.setText(R.string.no_actors_description); } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); if (mActors.size() == 0) new GetActorDetails(getArguments().getString("movieId"), getActivity()).execute(); } private class ImageAdapter extends BaseAdapter { private final LayoutInflater mInflater; private final Context mContext; public ImageAdapter(Context context) { mContext = context; mInflater = LayoutInflater.from(mContext); } @Override public int getCount() { return mActors.size(); } @Override public boolean isEmpty() { return getCount() == 0 && mLoaded; } @Override public Object getItem(int position) { return position; } @Override public long getItemId(int position) { return position; } @Override public int getItemViewType(int position) { return 0; } @Override public int getViewTypeCount() { return 1; } @Override public View getView(int position, View convertView, ViewGroup container) { CoverItem holder; if (convertView == null) { convertView = mInflater.inflate(R.layout.grid_cover_two_line, container, false); holder = new CoverItem(); holder.cover = (ImageView) convertView.findViewById(R.id.cover); holder.text = (TextView) convertView.findViewById(R.id.text); holder.text.setSingleLine(true); holder.subtext = (TextView) convertView.findViewById(R.id.sub_text); holder.subtext.setSingleLine(true); holder.text.setTypeface(TypefaceUtils.getRobotoMedium(mContext)); convertView.setTag(holder); } else { holder = (CoverItem) convertView.getTag(); } holder.cover.setImageResource(R.color.card_background_dark); holder.text.setText(mActors.get(position).getName()); holder.subtext.setText(mActors.get(position).getCharacter()); // Finally load the image asynchronously into the ImageView, this also takes care of // setting a placeholder image while the background thread runs if (!mActors.get(position).getUrl().endsWith("null")) mPicasso.load(mActors.get(position).getUrl()).error(R.drawable.noactor).config(mConfig) .into(holder); else holder.cover.setImageResource(R.drawable.noactor); return convertView; } } protected class GetActorDetails extends AsyncTask<Void, Void, Void> { private final Context mContext; private final String mMovieId; public GetActorDetails(String movieId, Context context) { mMovieId = movieId; mContext = context; } @Override protected void onPreExecute() { mProgressBar.setVisibility(View.VISIBLE); } @Override protected Void doInBackground(Void... params) { MovieApiService service = MizuuApplication.getMovieService(mContext); mActors = new ArrayList<Actor>(service.getActors(mMovieId)); return null; } @Override protected void onPostExecute(Void result) { if (isAdded()) { mProgressBar.setVisibility(View.GONE); mAdapter.notifyDataSetChanged(); mEmptyView.setVisibility((mActors.size() == 0) ? View.VISIBLE : View.GONE); } } } }