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Apache License
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package com.globant.mobile.handson; /*from www . j a va 2 s. co m*/ import java.io.File; import java.util.zip.Inflater; import android.annotation.TargetApi; import android.app.ActivityOptions; import android.content.Context; import android.content.Intent; import android.net.Uri; import android.os.Build; import android.os.Bundle; import android.support.v4.app.Fragment; import android.util.Log; import android.util.TypedValue; import android.view.ActionMode; import android.view.ContextMenu; import android.view.ContextMenu.ContextMenuInfo; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; 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.AdapterView.AdapterContextMenuInfo; import android.widget.BaseAdapter; import android.widget.GridView; import android.widget.ImageView; import android.widget.ShareActionProvider; import com.globant.mobile.handson.media.BitmapCache.ImageCacheParams; import com.globant.mobile.handson.media.BitmapFetcher; import com.globant.mobile.handson.provider.Bitmaps; /** * A simple {@link android.support.v4.app.Fragment} subclass. Activities that * contain this fragment must implement the * {@link ImageGrid.OnFragmentInteractionListener} interface to handle * interaction events. Use the {@link ImageGrid#newInstance} factory method to * create an instance of this fragment. * */ public class ImageGrid extends Fragment implements AdapterView.OnItemClickListener, AdapterView.OnItemLongClickListener{ private static final String TAG = "ImageGridFragment"; private static final String IMAGE_CACHE_DIR = "thumbs"; private int mImageThumbSize; private int mImageThumbSpacing; private ImageAdapter mAdapter; private BitmapFetcher mImageFetcher; private ActionMode mActionMode; public ImageGrid() {} @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); mAdapter = new ImageAdapter(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 BitmapFetcher(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.fragment_image_grid, container, false); final GridView mGridView = (GridView) v.findViewById(R.id.gridView); 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) { } }); //Setting the Context Menu for the GridVew id API level is lower than Honeycomb if(Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB){ registerForContextMenu(mGridView); }else{ mGridView.setOnItemLongClickListener(this); } // 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; } @TargetApi(Build.VERSION_CODES.HONEYCOMB) @Override public void onResume() { super.onResume(); if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB){ final GridView mGridView = (GridView) this.getActivity().findViewById(R.id.gridView); mGridView.clearChoices(); } 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(), ImageDetailActivity.class); i.putExtra(ImageDetailActivity.EXTRA_IMAGE, (int) id); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) { // 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); } } @TargetApi(Build.VERSION_CODES.HONEYCOMB) @Override public boolean onItemLongClick(AdapterView<?> parent, View v, int position, long id) { //Setting the Context Action Bar if API Level is Honeycomb and higher if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB){ if(mActionMode != null){ return false; } final int index = position; final int realIndex = (int)id; ActionMode.Callback mActionModeCallback = new ActionMode.Callback() { @Override public boolean onPrepareActionMode(ActionMode mode, Menu menu) { return false; } @Override public void onDestroyActionMode(ActionMode mode) { mActionMode = null; } @TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH) @Override public boolean onCreateActionMode(ActionMode mode, Menu menu) { // Inflate a menu resource providing context menu items MenuInflater inflater = mode.getMenuInflater(); inflater.inflate(R.menu.image_context_bar, menu); return true; } @TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH) @Override public boolean onActionItemClicked(ActionMode mode, MenuItem item) { switch(item.getItemId()){ case R.id.action_delete:{ deleteBitmap(index, realIndex); mode.finish(); // Action picked, so close the CAB return true; } case R.id.action_share:{ if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH){ getShareIntent(index); } mode.finish(); return true; } default: return false; } } }; mActionMode = this.getActivity().startActionMode(mActionModeCallback); v.setSelected(true); return true; }else{ return false; } } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { inflater.inflate(R.menu.main, menu); } @Override public void onCreateContextMenu(ContextMenu menu, View view, ContextMenuInfo menuInfo){ super.onCreateContextMenu(menu, view, menuInfo); MenuInflater inflater = this.getActivity().getMenuInflater(); inflater.inflate(R.menu.image_context_bar, menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { return super.onOptionsItemSelected(item); } @Override public boolean onContextItemSelected(MenuItem item){ AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo(); switch (item.getItemId()) { case R.id.action_delete: deleteBitmap(info.position, (int)info.id); return true; case R.id.action_share: getShareIntent(info.position); return true; default: return super.onContextItemSelected(item); } } private void deleteBitmap(int position, int realPosition) { final GridView mGridView = (GridView)this.getActivity().findViewById(R.id.gridView); String bitmapPath = (String)mGridView.getAdapter().getItem(position); File fileToDelete = new File(bitmapPath); if(fileToDelete.exists()){ fileToDelete.delete(); Bitmaps.removeItemAt(realPosition); mAdapter.notifyDataSetChanged(); } } private void getShareIntent(int position) { final GridView mGridView = (GridView)this.getActivity().findViewById(R.id.gridView); String bitmapPath = (String)mGridView.getAdapter().getItem(position); //Create the intent Intent shareIntent = new Intent(); shareIntent.setAction(Intent.ACTION_SEND); shareIntent.putExtra(Intent.EXTRA_STREAM, Uri.parse(bitmapPath)); shareIntent.setType("image/jpeg"); startActivity(Intent.createChooser(shareIntent, getResources().getText(R.string.action_share))); } /** * 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 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() { // Size + number of columns for top empty row return Bitmaps.imageThumbUrls.length + mNumColumns; } @Override public Object getItem(int position) { return position < mNumColumns ? null : Bitmaps.imageThumbUrls[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) { // 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( ViewGroup.LayoutParams.MATCH_PARENT, mActionBarHeight)); return convertView; } // Now handle the main ImageView thumbnails ImageView imageView; if (convertView == null) { // 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; } // Check the height matches our calculated column width if (imageView.getLayoutParams().height != mItemHeight) { imageView.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(Bitmaps.imageThumbUrls[position - mNumColumns], imageView, "false", null); return imageView; } /** * 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; } } }