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.cm.android.displayingbitmaps.ui; import android.annotation.TargetApi; import android.app.Activity; import android.app.ActivityOptions; import android.app.AlertDialog; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.net.Uri; import android.os.Build.VERSION_CODES; import android.os.Bundle; import android.provider.MediaStore; import android.support.v4.app.Fragment; import android.util.TypedValue; 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.BaseAdapter; import android.widget.GridView; import android.widget.ImageView; import android.widget.Toast; import com.cm.android.common.logger.Log; import com.cm.android.displayingbitmaps.AnalyticsTrackers; import com.cm.android.displayingbitmaps.BuildConfig; import com.cm.android.displayingbitmaps.R; import com.cm.android.displayingbitmaps.provider.AuthProvider; import com.cm.android.displayingbitmaps.provider.Images; import com.cm.android.displayingbitmaps.util.ImageCache; import com.cm.android.displayingbitmaps.util.ImageFetcher; import com.cm.android.displayingbitmaps.util.Utils; import com.google.android.gms.ads.AdSize; import com.google.android.gms.analytics.HitBuilders; import com.google.android.gms.analytics.Tracker; import java.io.File; import java.io.IOException; import me.philio.pinentry.PinEntryView; import com.google.android.gms.ads.AdRequest; import com.google.android.gms.ads.AdView; /** * 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 static final String IMAGE_CACHE_DIR = "thumbs"; private static final int REQUEST_TAKE_PHOTO = 1; private int mImageThumbSize; private int mImageThumbSpacing; private ImageAdapter mAdapter; private ImageFetcher mImageFetcher; //private Uri mImageUri; private PinEntryView mPinEntryView; private Tracker mTracker; private AdView mAdView; /** * Empty constructor as per the Fragment documentation */ public ImageGridFragment() { } @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()); ImageCache.ImageCacheParams cacheParams = new ImageCache.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); mTracker = Utils.getAnalyticsTracker(getActivity(), AnalyticsTrackers.Target.APP); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { final View v = inflater.inflate(R.layout.image_grid_fragment, 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) { // 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(columnWidth); if (BuildConfig.DEBUG) { Log.d(TAG, "onCreateView - numColumns set to " + numColumns); } if (Utils.hasJellyBean()) { mGridView.getViewTreeObserver().removeOnGlobalLayoutListener(this); } else { mGridView.getViewTreeObserver().removeGlobalOnLayoutListener(this); } } } } }); //@author anshu final ImageView mAddImage = (ImageView) v.findViewById(R.id.add_image); mAddImage.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { try { takePhoto(); } catch (IOException ex) { // Error occurred while creating the File Log.e("takePhoto", ex.toString()); } } }); //Admob mAdView = (AdView) v.findViewById(R.id.adView); return v; } @Override public void onStart() { super.onStart(); getActivity().runOnUiThread(new Runnable() { public void run() { //GA mTracker.setScreenName("ImageGrid"); //use count of images mTracker.send(new HitBuilders.ScreenViewBuilder() .setCustomMetric(1, Images.getImageUrls(getActivity()).size()).build()); //AdMob AdRequest adRequest = new AdRequest.Builder().build(); mAdView.loadAd(adRequest); } }); } @Override public void onStop() { super.onStop(); AuthProvider.getAuthProvider().logout(); } /** * @author anshu */ public void takePhoto() throws IOException { Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); if (takePictureIntent.resolveActivity(getActivity().getPackageManager()) != null) { File photoFile = null; try { photoFile = Utils.createImageFile(getActivity()); } catch (IOException ex) { // Error occurred while creating the File Log.e("takePhoto", ex.toString()); } // Continue only if the File was successfully created if (photoFile != null) { getActivity().getSharedPreferences(Utils.SHARED_PREF_NAME, Context.MODE_PRIVATE).edit() .putString("IMAGE_NAME", photoFile.getName()).commit(); takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photoFile)); startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO); } } } @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); switch (requestCode) { case REQUEST_TAKE_PHOTO: if (resultCode == Activity.RESULT_OK) { String imageFileName = getActivity() .getSharedPreferences(Utils.SHARED_PREF_NAME, Context.MODE_PRIVATE) .getString("IMAGE_NAME", null); String imageAbsolutePath = Utils.getExternalImageStorageDir(getActivity()).getAbsolutePath() + File.separator + imageFileName; String thumbnailAbsolutePath = Utils.getExternalThumbnailStorageDir(getActivity()).getAbsolutePath() + File.separator + imageFileName; Utils.createThumbnail(getActivity(), imageAbsolutePath, thumbnailAbsolutePath, Utils.THUMBNAIL_SIZE, Utils.THUMBNAIL_SIZE); mAdapter.notifyDataSetChanged(); } } } @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(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); 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.update_pin_menu: Intent intent = new Intent(getActivity(), ChangePinActivity.class); startActivity(intent); return true; case R.id.logout_menu: logout(); return true; } return super.onOptionsItemSelected(item); } private void logout() { AlertDialog.Builder builder = new AlertDialog.Builder(ImageGridFragment.this.getActivity()); builder.setMessage("Logout?").setPositiveButton("Logout now", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int id) { AuthProvider.getAuthProvider().logout(); getActivity().finish(); } }).setNegativeButton("Cancel", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int id) { dialog.cancel(); } }).show(); } /** * 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() { // If columns have yet to be determined, return no items if (getNumColumns() == 0) { return 0; } // Size + number of columns for top empty row //return Images.imageThumbUrls.length + mNumColumns; //return Images.getThumbnailUrls(getActivity()).size() + mNumColumns; return Images.getThumbnailUrls(getActivity()).size() + mNumColumns; } @Override public Object getItem(int position) { // return position < mNumColumns ? // null : Images.imageThumbUrls[position - mNumColumns]; // return position < mNumColumns ? // null : Images.getThumbnailUrls(getActivity()).get(position - mNumColumns); return position < mNumColumns ? null : Images.getThumbnailUrls(getActivity()).get(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 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(Images.imageThumbUrls[position - mNumColumns], imageView); mImageFetcher.loadImage(Images.getThumbnailUrls(getActivity()).get(position - mNumColumns), imageView); return imageView; //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; } } }