Java tutorial
/* * Copyright (C) 2012 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.mklodoss.SexyGirl.displayingbitmaps.ui; import android.annotation.TargetApi; import android.app.ActivityOptions; import android.app.ProgressDialog; import android.content.Context; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.Color; import android.os.Build.VERSION_CODES; import android.os.Bundle; import android.support.v4.app.Fragment; import android.view.*; import android.view.ViewGroup.LayoutParams; import android.widget.*; import com.mklodoss.SexyGirl.BuildConfig; import com.mklodoss.SexyGirl.R; import com.mklodoss.SexyGirl.displayingbitmaps.util.Utils; import com.mklodoss.SexyGirl.event.SeriesUpdatedEvent; import com.mklodoss.SexyGirl.logger.Log; import com.mklodoss.SexyGirl.model.CollectedBelle; import com.mklodoss.SexyGirl.model.LocalBelle; import com.mklodoss.SexyGirl.util.BelleHelper; import com.mklodoss.SexyGirl.util.CollectHelper; import com.mklodoss.SexyGirl.util.Toaster; import com.nostra13.universalimageloader.core.ImageLoader; import com.nostra13.universalimageloader.core.assist.FailReason; import com.nostra13.universalimageloader.core.listener.ImageLoadingListener; import de.greenrobot.event.EventBus; import java.lang.ref.WeakReference; import java.util.ArrayList; import java.util.List; /** * The main fragment that powers the ImageGridActivity screen. Fairly straight forward GridView * implementation with the key addition being the ImageWorker class w/ImageCache to load children * asynchronously, keeping the UI nice and smooth and caching thumbnails for quick retrieval. The * cache is retained over configuration changes like orientation change so the images are populated * quickly if, for example, the user rotates the device. */ public class ImageGridFragment extends Fragment implements AdapterView.OnItemClickListener { private static final String TAG = "ImageGridFragment"; private int mImageThumbSize; private int mImageThumbSpacing; private ImageAdapter mAdapter; //private ImageFetcher mImageFetcher; public static final String ARG_PLANET_NUMBER = "categoty"; private int category; public volatile static List<LocalBelle> list = new ArrayList<LocalBelle>(); GridView mGridView; LayoutInflater layoutInflater; ProgressDialog progressDialog; /** * Empty constructor as per the Fragment documentation */ public ImageGridFragment() { } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); layoutInflater = getLayoutInflater(savedInstanceState); setHasOptionsMenu(false); mImageThumbSize = getResources().getDimensionPixelSize(R.dimen.image_thumbnail_size); mImageThumbSpacing = getResources().getDimensionPixelSize(R.dimen.image_thumbnail_spacing); mAdapter = new ImageAdapter(getActivity()); /* mImageFetcher = MainApplication._application.getmImageFetcher(); mImageFetcher.addImageCache(getActivity().getSupportFragmentManager(), MainApplication._application.getCacheParams());*/ //?? category = getArguments().getInt(ARG_PLANET_NUMBER); if (category == -1) { //? list.clear(); list.addAll(CollectHelper.getInstance().loadAll()); } else { list.clear(); list.addAll(BelleHelper.getInstance().getLocaleBell(this.getActivity(), category, new BelleHelper.LocalBelleNotifyCallBack(new WeakReference<ImageGridFragment>(this)))); } progressDialog = new ProgressDialog(this.getActivity()); progressDialog.setProgressStyle(0); adapterNotify(false); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { final View v = inflater.inflate(R.layout.image_grid_fragment, container, false); mGridView = (GridView) v.findViewById(R.id.gridView); mGridView.setAdapter(mAdapter); mGridView.setBackgroundColor(Color.GRAY); mGridView.setOnItemClickListener(this); mGridView.setOnScrollListener(new AbsListView.OnScrollListener() { @Override public void onScrollStateChanged(AbsListView absListView, int scrollState) { // Pause fetcher to ensure smoother scrolling when flinging if (scrollState == AbsListView.OnScrollListener.SCROLL_STATE_FLING) { // Before Honeycomb pause image loading on scroll to help with performance if (!Utils.hasHoneycomb()) { //mImageFetcher.setPauseWork(true); } } else { //mImageFetcher.setPauseWork(false); } } @Override public void onScroll(AbsListView absListView, int firstVisibleItem, int visibleItemCount, int totalItemCount) { } }); // This listener is used to get the final width of the GridView and then calculate the // number of columns and the width of each column. The width of each column is variable // as the GridView has stretchMode=columnWidth. The column width is used to set the height // of each view so we get nice square thumbnails. mGridView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() { @TargetApi(VERSION_CODES.JELLY_BEAN) @Override public void onGlobalLayout() { if (mAdapter.getNumColumns() == 0) { final int numColumns = (int) Math .floor(mGridView.getWidth() / (mImageThumbSize + mImageThumbSpacing)); if (numColumns > 0) { final int columnWidth = (mGridView.getWidth() / numColumns) - mImageThumbSpacing; mAdapter.setNumColumns(numColumns); mAdapter.setItemHeight((int) (columnWidth * 1.46)); if (BuildConfig.DEBUG) { Log.d(TAG, "onCreateView - numColumns set to " + numColumns); } if (Utils.hasJellyBean()) { mGridView.getViewTreeObserver().removeOnGlobalLayoutListener(this); } else { mGridView.getViewTreeObserver().removeGlobalOnLayoutListener(this); } } } } }); return v; } @Override public void onResume() { super.onResume(); mAdapter.notifyDataSetChanged(); } @Override public void onPause() { super.onPause(); } @Override public void onDestroy() { super.onDestroy(); ImageLoader.getInstance().stop(); } @TargetApi(VERSION_CODES.JELLY_BEAN) @Override public void onItemClick(AdapterView<?> parent, View v, int position, long id) { final Intent i = new Intent(getActivity(), ImageDetailActivity.class); i.putExtra(ImageDetailActivity.EXTRA_IMAGE, (int) id); i.putExtra(ImageDetailActivity.EXTRA_CATEGORY, category); if (Utils.hasJellyBean()) { // makeThumbnailScaleUpAnimation() looks kind of ugly here as the loading spinner may // show plus the thumbnail image in GridView is cropped. so using // makeScaleUpAnimation() instead. ActivityOptions options = ActivityOptions.makeScaleUpAnimation(v, 0, 0, v.getWidth(), v.getHeight()); getActivity().startActivity(i, options.toBundle()); } else { startActivity(i); } } /** * The main adapter that backs the GridView. This is fairly standard except the number of * columns in the GridView is used to create a fake top row of empty views as we use a * transparent ActionBar and don't want the real top row of images to start off covered by it. */ private class ImageAdapter extends BaseAdapter { private final Context mContext; private int mItemHeight = 0; private int mNumColumns = 0; private int mActionBarHeight = 0; private GridView.LayoutParams mImageViewLayoutParams; // public String[] urls = Images.imageThumbUrls; public String[] urls = new String[0]; public ImageAdapter(Context context) { super(); mContext = context; mImageViewLayoutParams = new GridView.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT); // Calculate ActionBar height /* TypedValue tv = new TypedValue(); if (context.getTheme().resolveAttribute( android.R.attr.actionBarSize, tv, true)) { mActionBarHeight = TypedValue.complexToDimensionPixelSize( tv.data, context.getResources().getDisplayMetrics()); }*/ } @Override public int getCount() { // If columns have yet to be determined, return no items if (getNumColumns() == 0) { return 0; } // Size + number of columns for top empty row return urls.length + mNumColumns; } @Override public Object getItem(int position) { return position < mNumColumns ? null : urls[position - mNumColumns]; } @Override public long getItemId(int position) { return position < mNumColumns ? 0 : position - mNumColumns; } @Override public int getViewTypeCount() { // Two types of views, the normal ImageView and the top row of empty views return 2; } @Override public int getItemViewType(int position) { return (position < mNumColumns) ? 1 : 0; } @Override public boolean hasStableIds() { return true; } @Override public View getView(int position, View convertView, ViewGroup container) { //BEGIN_INCLUDE(load_gridview_item) // First check if this is the top row if (position < mNumColumns) { if (convertView == null) { convertView = new View(mContext); } // Set empty view with height of ActionBar convertView .setLayoutParams(new AbsListView.LayoutParams(LayoutParams.MATCH_PARENT, mActionBarHeight)); return convertView; } // Now handle the main ImageView thumbnails View view; RecyclingImageView imageView; final ProgressBar progressBar; if (convertView == null) { // if it's not recycled, instantiate and initialize view = layoutInflater.inflate(R.layout.thumb_image_view, mGridView, false); imageView = (RecyclingImageView) view.findViewById(R.id.photo); imageView.setScaleType(ImageView.ScaleType.CENTER_CROP); progressBar = (ProgressBar) view.findViewById(R.id.progressBar); ViewHolder holder = new ViewHolder(view); view.setTag(holder); view.setLayoutParams(mImageViewLayoutParams); } else { // Otherwise re-use the converted view view = convertView; ViewHolder holder = (ViewHolder) convertView.getTag(); imageView = holder.photo; progressBar = holder.progressBar; } // Check the height matches our calculated column width /*if (imageView.getLayoutParams().height != mItemHeight) { imageView.setLayoutParams(new RelativeLayout.LayoutParams( LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT)); }*/ //imageView.setImageDrawable(getResources().getDrawable(R.drawable.loading)); // Finally load the image asynchronously into the ImageView, this also takes care of // setting a placeholder image while the background thread runs //mImageFetcher.loadImage(urls[position - mNumColumns], imageView); progressBar.setVisibility(View.GONE); ImageLoader.getInstance().displayImage(urls[position - mNumColumns], imageView, new ImageLoadingListener() { @Override public void onLoadingStarted(String s, View view) { progressBar.setVisibility(View.VISIBLE); } @Override public void onLoadingFailed(String s, View view, FailReason failReason) { progressBar.setVisibility(View.GONE); } @Override public void onLoadingComplete(String s, View view, Bitmap bitmap) { progressBar.setVisibility(View.GONE); } @Override public void onLoadingCancelled(String s, View view) { progressBar.setVisibility(View.GONE); } }); return view; //END_INCLUDE(load_gridview_item) } /** * Sets the item height. Useful for when we know the column width so the height can be set * to match. * * @param height */ public void setItemHeight(int height) { if (height == mItemHeight) { return; } mItemHeight = height; mImageViewLayoutParams = new GridView.LayoutParams(LayoutParams.MATCH_PARENT, mItemHeight); //mImageFetcher.setImageSize(height); notifyDataSetChanged(); } public void setNumColumns(int numColumns) { mNumColumns = numColumns; } public int getNumColumns() { return mNumColumns; } } /** * adapter? */ private void adapterNotify(boolean notify) { if (list != null && list.size() > 0) { if (isOtherCollect()) { progressDialog.dismiss(); } if (!isHideCategory(category)) { String[] urls = new String[list.size()]; for (int i = 0; i < list.size(); i++) { LocalBelle localBelle = list.get(i); urls[i] = localBelle.getUrl(); } mAdapter.urls = urls; if (notify) { mAdapter.notifyDataSetChanged(); } } } else { if (isOtherCollect()) { progressDialog.show(); } else if (isMyCollect()) { Toaster.show(getActivity(), R.string.has_no_collect); } } } /** * ? */ public void updateBellList() { android.util.Log.e("tttttttt", "onEventMainThread----------------------------"); list = BelleHelper.getInstance().getLocalBelleList(); ImageLoader.getInstance().resume(); adapterNotify(true); } /** *?? */ public void getBellListFromNetWork() { if (isOtherCollect()) { ImageLoader.getInstance().pause(); BelleHelper.getInstance().getLocaleBellFromNetwork(this.getActivity(), category, new BelleHelper.LocalBelleNotifyCallBack(new WeakReference<ImageGridFragment>(this))); progressDialog.show(); } } private static final class ViewHolder { public RecyclingImageView photo; public ProgressBar progressBar; public ViewHolder(View paramView) { this.photo = ((RecyclingImageView) paramView.findViewById(R.id.photo)); this.progressBar = ((ProgressBar) paramView.findViewById(R.id.progressBar)); } } /** * ?? * * @return boolean */ public boolean isMyCollect() { return -1 == category; } /** * ??? * @return */ public static boolean isHideCategory(int category) { return -2 == category; } /** * ? * @return */ public boolean isOtherCollect() { return category > 0; } }