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.fbbackup; import java.util.HashMap; import com.technotalkative.loadwebimage.imageutils.ImageLoader; import util.DownloadList; import util.ImageCache.ImageCacheParams; import util.ImageFetcher; import util.Utils; import android.annotation.TargetApi; import android.app.ActivityOptions; import android.content.Context; import android.content.Intent; import android.os.Bundle; import android.support.v4.app.Fragment; import android.util.Log; import android.util.TypedValue; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.ViewGroup.LayoutParams; import android.view.ViewTreeObserver; import android.widget.AbsListView; import android.widget.AdapterView; import android.widget.BaseAdapter; import android.widget.CheckBox; import android.widget.CompoundButton; import android.widget.GridView; import android.widget.ImageButton; import android.widget.ImageView; import android.widget.RelativeLayout; import android.widget.TextView; /** * 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 TagMeImageGridFragment extends Fragment implements AdapterView.OnItemClickListener { private static final String TAG = "ImageGridFragment"; private static final String IMAGE_CACHE_DIR = "thumbs"; private int mImageThumbSize; private int mImageThumbSpacing; private ImageAdapter mAdapter; private ImageFetcher mImageFetcher; private ImageLoader imageLoader; private HashMap<Integer, Boolean> isSelected; private ImageButton btn_download_photo; private CheckBox cb_all; private ImageButton btn_tag_me; private ImageButton btn_photo; String tagMePicture[]; private String name = ""; private String albumName = "me"; /** * Empty constructor as per the Fragment documentation */ public TagMeImageGridFragment() { } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setHasOptionsMenu(true); mImageThumbSize = getResources().getDimensionPixelSize(R.dimen.image_thumbnail_size); mImageThumbSpacing = getResources().getDimensionPixelSize(R.dimen.image_thumbnail_spacing); tagMePicture = getArguments().getStringArray("tagMePicture"); name = getArguments().getString("userName"); // iOO_QcheckboxABlcheckbox isSelected = new HashMap<Integer, Boolean>(); initSelectedData(); mAdapter = new ImageAdapter(getActivity()); imageLoader = new ImageLoader(getActivity()); ImageCacheParams cacheParams = new ImageCacheParams(getActivity(), IMAGE_CACHE_DIR); cacheParams.setMemCacheSizePercent(0.25f); // Set memory cache to 25% of // app memory // The ImageFetcher takes care of loading images into our ImageView // children asynchronously mImageFetcher = new ImageFetcher(getActivity(), mImageThumbSize); mImageFetcher.setLoadingImage(R.drawable.empty_photo); mImageFetcher.addImageCache(getActivity().getSupportFragmentManager(), cacheParams); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { final View v = inflater.inflate(R.layout.album_photo_grid, container, false); final GridView mGridView = (GridView) v.findViewById(R.id.gridView); TextView tx_user_name = (TextView) v.findViewById(R.id.tx_album_name); tx_user_name.setText(albumName); btn_tag_me = (ImageButton) v.findViewById(R.id.btn_tag_me); btn_photo = (ImageButton) v.findViewById(R.id.btn_photo); btn_tag_me.setVisibility(View.VISIBLE); btn_photo.setVisibility(View.VISIBLE); tx_user_name.setVisibility(View.GONE); btn_tag_me.setBackgroundResource(R.drawable.tagme); btn_photo.setOnClickListener(new ImageButton.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub getFragmentManager().popBackStack(); MyFriendFragmentActivity.controlPanelHandler .sendEmptyMessage(MyFriendFragmentActivity.SHOW_CONTROL_PANEL); } }); cb_all = (CheckBox) v.findViewById(R.id.cb_all_photo); cb_all.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton v, boolean choose) { // TODO Auto-generated method stub if (choose) { // Toast.makeText(getActivity(), "choose:" + choose, // Toast.LENGTH_SHORT).show(); } else { // Toast.makeText(getActivity(), "choose:" + choose, // Toast.LENGTH_SHORT).show(); } setSelectedData(choose); mAdapter.notifyDataSetChanged(); } }); btn_download_photo = (ImageButton) v.findViewById(R.id.btn_download_photo); btn_download_photo.setOnClickListener(new ImageButton.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub String dir = Utils.getDirName(albumName); int select = 0; // QarrayU for (int i = 0; i < isSelected.size(); i++) { if (isSelected.get(i)) { DownloadList.downloadPhotoAlbumQueue.add(dir); DownloadList.downloadPhotoQueue.add(tagMePicture[i]); DownloadList.downloadUserNameQueue.add(name); select++; } } DownloadList.setAddNumber(select); DownloadList.setUserName(name); MyFriendFragmentActivity.downloadHandler.sendMessage(MyFriendFragmentActivity.downloadHandler .obtainMessage(MyFriendFragmentActivity.DOWNLOAD_PRB, 0, 0)); } }); isSelected = new HashMap<Integer, Boolean>(); initSelectedData(); mGridView.setAdapter(mAdapter); 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) { 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() { @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(columnWidth); if (BuildConfig.DEBUG) { Log.d(TAG, "onCreateView - numColumns set to " + numColumns); } } } } }); return v; } @Override public void onResume() { super.onResume(); mImageFetcher.setExitTasksEarly(false); mAdapter.notifyDataSetChanged(); } @Override public void onPause() { super.onPause(); mImageFetcher.setPauseWork(false); mImageFetcher.setExitTasksEarly(true); mImageFetcher.flushCache(); } @Override public void onDestroy() { super.onDestroy(); mImageFetcher.closeCache(); } @TargetApi(16) @Override public void onItemClick(AdapterView<?> parent, View v, int position, long id) { final Intent i = new Intent(getActivity(), TagImageDetailActivity.class); Bundle bundle = new Bundle(); bundle.putStringArray("photo", tagMePicture); bundle.putString("userName", name); i.putExtras(bundle); i.putExtra(ImageDetailActivity.EXTRA_IMAGE, (int) id); 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); } } // @Override // public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { // inflater.inflate(R.menu.main_menu, menu); // } // // @Override // public boolean onOptionsItemSelected(MenuItem item) { // switch (item.getItemId()) { // case R.id.clear_cache: // mImageFetcher.clearCache(); // Toast.makeText(getActivity(), R.string.clear_cache_complete_toast, // Toast.LENGTH_SHORT).show(); // return true; // } // return super.onOptionsItemSelected(item); // } /** * 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 RelativeLayout.LayoutParams mImageViewLayoutParams; private LayoutInflater mInflater; public ImageAdapter(Context context) { super(); mContext = context; mInflater = LayoutInflater.from(context); mImageViewLayoutParams = new RelativeLayout.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() { // Size + number of columns for top empty row return tagMePicture.length; } @Override public Object getItem(int position) { return tagMePicture[position]; } @Override public long getItemId(int position) { return position; } @Override public boolean hasStableIds() { return true; } @Override public View getView(final int position, View convertView, ViewGroup container) { final ViewHolder holder; // Now handle the main ImageView thumbnails // ImageView imageView; if (convertView == null) { convertView = mInflater.inflate(R.layout.photo_grid_item, container, false); holder = new ViewHolder(); holder.iv_image = (ImageView) convertView.findViewById(R.id.iv_image); holder.iv_image.setScaleType(ImageView.ScaleType.CENTER_CROP); holder.iv_image.setLayoutParams(mImageViewLayoutParams); holder.cb_choose = (CheckBox) convertView.findViewById(R.id.cb_choose); holder.cb_choose.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton v, boolean isChecked) { // TODO Auto-generated method stub int getPosition = (Integer) v.getTag(); isSelected.put(getPosition, isChecked); } }); convertView.setTag(holder); // convertView = new View(mContext); // if it's not recycled, instantiate and initialize // imageView = new RecyclingImageView(mContext); // imageView.setScaleType(ImageView.ScaleType.CENTER_CROP); // imageView.setLayoutParams(mImageViewLayoutParams); } else { // Otherwise re-use the converted view // imageView = (ImageView) convertView; holder = (ViewHolder) convertView.getTag(); } // convertView.setLayoutParams(new AbsListView.LayoutParams( // ViewGroup.LayoutParams.MATCH_PARENT, mActionBarHeight)); // Check the height matches our calculated column width if (holder.iv_image.getLayoutParams().height != mItemHeight) { holder.iv_image.setLayoutParams(mImageViewLayoutParams); } // Finally load the image asynchronously into the ImageView, this // also takes care of // setting a placeholder image while the background thread runs //mImageFetcher.loadImage(tagMePicture[position], holder.iv_image); imageLoader.DisplayImage(tagMePicture[position], holder.iv_image); holder.cb_choose.setTag(position); holder.cb_choose.setChecked(isSelected.get(position)); Log.w("check", "open :" + (position)); return convertView; } /** * 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 RelativeLayout.LayoutParams(LayoutParams.MATCH_PARENT, mItemHeight); mImageFetcher.setImageSize(height); notifyDataSetChanged(); } public void setNumColumns(int numColumns) { mNumColumns = numColumns; } public int getNumColumns() { return mNumColumns; } } public class ViewHolder { private ImageView iv_image; private CheckBox cb_choose; } private void initSelectedData() { for (int i = 0; i < tagMePicture.length; i++) { isSelected.put(i, false); } } private void setSelectedData(boolean selected) { for (int i = 0; i < tagMePicture.length; i++) { isSelected.put(i, selected); } } }