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.app.AlertDialog; import android.content.DialogInterface; import android.content.Intent; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.NavUtils; import android.util.Log; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.ProgressBar; import android.widget.Toast; import com.cm.android.displayingbitmaps.AnalyticsTrackers; import com.cm.android.displayingbitmaps.R; import com.cm.android.displayingbitmaps.provider.Images; import com.cm.android.displayingbitmaps.util.AsyncTask; import com.cm.android.displayingbitmaps.util.ImageFetcher; import com.cm.android.displayingbitmaps.util.ImageWorker; import com.cm.android.displayingbitmaps.util.Utils; import com.google.android.gms.ads.AdRequest; import com.google.android.gms.ads.AdSize; import com.google.android.gms.ads.AdView; import com.google.android.gms.analytics.HitBuilders; import com.google.android.gms.analytics.Tracker; import java.io.File; import java.util.ArrayList; import java.util.List; /** * This fragment will populate the children of the ViewPager from {@link ImageDetailActivity}. */ public class ImageDetailFragment extends Fragment implements ImageWorker.OnImageLoadedListener, ImageWorker.OnImageDeletedListener { private static final String IMAGE_DATA_EXTRA = "extra_image_data"; private static final String IMAGE_THUMBNAIL_DATA_EXTRA = "extra_thumbnail_image_data"; private String mImageUrl; private String mThumbnailUrl; private ImageView mImageView; private ProgressBar mProgressBar; private ImageFetcher mImageFetcher; //@author anshu private Tracker mTracker; private AdView mAdView; /** * Factory method to generate a new instance of the fragment given an image number. * * @param imageUrl The image url to load * @return A new instance of ImageDetailFragment with imageNum extras */ public static ImageDetailFragment newInstance(String imageUrl, String imageThumbnailUrl) { final ImageDetailFragment f = new ImageDetailFragment(); final Bundle args = new Bundle(); args.putString(IMAGE_DATA_EXTRA, imageUrl); args.putString(IMAGE_THUMBNAIL_DATA_EXTRA, imageThumbnailUrl); f.setArguments(args); return f; } /** * Empty constructor as per the Fragment documentation */ public ImageDetailFragment() { } /** * Populate image using a url from extras, use the convenience factory method * {@link ImageDetailFragment#newInstance(String, String)} to create this fragment. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mImageUrl = getArguments() != null ? getArguments().getString(IMAGE_DATA_EXTRA) : null; mThumbnailUrl = getArguments() != null ? getArguments().getString(IMAGE_THUMBNAIL_DATA_EXTRA) : null; mTracker = Utils.getAnalyticsTracker(getActivity(), AnalyticsTrackers.Target.APP); //required to set the options menu setHasOptionsMenu(true); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate and locate the main ImageView final View v = inflater.inflate(R.layout.image_detail_fragment, container, false); mImageView = (ImageView) v.findViewById(R.id.imageView); mProgressBar = (ProgressBar) v.findViewById(R.id.progressbar); //@author anshu: //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("ImageDetail"); mTracker.send(new HitBuilders.ScreenViewBuilder().build()); //AdMob AdRequest adRequest = new AdRequest.Builder().build(); mAdView.loadAd(adRequest); } }); } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); // Use the parent activity to load the image asynchronously into the ImageView (so a single // cache can be used over all pages in the ViewPager if (ImageDetailActivity.class.isInstance(getActivity())) { mImageFetcher = ((ImageDetailActivity) getActivity()).getImageFetcher(); mImageFetcher.loadImage(mImageUrl, mImageView, this); } } @Override public void onDestroy() { super.onDestroy(); if (mImageView != null) { // Cancel any pending image work ImageWorker.cancelWork(mImageView); mImageView.setImageDrawable(null); } } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { inflater.inflate(R.menu.image_detail_menu, menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case android.R.id.home: NavUtils.navigateUpFromSameTask(getActivity()); return true; case R.id.delete_menu: deleteImage(); return true; } return super.onOptionsItemSelected(item); } private void deleteImage() { AlertDialog.Builder builder = new AlertDialog.Builder(ImageDetailFragment.this.getActivity()); builder.setMessage("Delete image?").setPositiveButton("Delete now", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int id) { // Yes-code mProgressBar.setVisibility(View.VISIBLE); //String[] params = {mImageUrl, mThumbnailUrl}; //new DeleteImageAsyncTask().execute(params); try { //delete files under Pictures File imageFile = new File(mImageUrl); File thumbnailFile = new File(mThumbnailUrl); //delete thumbnail first for better ux if (thumbnailFile.delete() && imageFile.delete()) { List<Object> data = new ArrayList<Object>(); //delete thumbnail first data.add(mThumbnailUrl); data.add(mImageUrl); //delete files in the cache mImageFetcher.deleteImages(data, ImageDetailFragment.this); } else { Log.e(ImageDetailFragment.class.getName(), "Unable to delete files"); Toast.makeText(getActivity(), "Unable to delete", Toast.LENGTH_SHORT).show(); } } catch (Exception e) { Log.e(ImageDetailFragment.class.getName(), e.getMessage()); } //getActivity().finish(); } }).setNegativeButton("Cancel", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int id) { dialog.cancel(); } }).show(); } @Override public void onImageLoaded(boolean success) { // Set loading spinner to gone once image has loaded. Cloud also show // an error view here if needed. mProgressBar.setVisibility(View.GONE); } @Override public void onImageDeleted(boolean success) { //getActivity().getSupportFragmentManager().popBackStack(); mProgressBar.setVisibility(View.GONE); getActivity().finish(); } /** * @author anshu */ private class DeleteImageAsyncTask extends AsyncTask<String, Void, Void> { @Override protected Void doInBackground(String... strings) { String mImageUrl = strings[0]; String mImageThumbnailUrl = strings[1]; try { //delete files under Pictures File imageFile = new File(mImageUrl); File thumbnailFile = new File(mImageUrl); //delete thumbnail first for better ux if (thumbnailFile.delete() && imageFile.delete()) { List<Object> data = new ArrayList<Object>(); //delete thumbnail first data.add(mImageThumbnailUrl); data.add(mImageUrl); //delete files in the cache mImageFetcher.deleteImages(data, ImageDetailFragment.this); } else { Log.e(ImageDetailFragment.class.getName(), "Unable to delete files"); Toast.makeText(getActivity(), "Unable to delete", Toast.LENGTH_SHORT).show(); } } catch (Exception e) { Log.e(ImageDetailFragment.class.getName(), e.getMessage()); } return null; } @Override protected void onPostExecute(Void result) { } } }