Java tutorial
/* * Copyright 2017 Chaos * * 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 org.chaos.fx.cnbeta.details; import android.content.Intent; import android.graphics.drawable.BitmapDrawable; import android.net.Uri; import android.os.Build; import android.os.Bundle; import android.os.Environment; import android.support.annotation.Nullable; import android.support.v4.app.Fragment; import android.support.v4.content.FileProvider; import android.support.v4.view.ViewCompat; import android.view.ContextMenu; import android.view.LayoutInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.ProgressBar; import android.widget.Toast; import com.github.chrisbanes.photoview.OnOutsidePhotoTapListener; import com.github.chrisbanes.photoview.OnPhotoTapListener; import com.github.chrisbanes.photoview.PhotoView; import com.squareup.picasso.Callback; import com.squareup.picasso.Picasso; import org.chaos.fx.cnbeta.BuildConfig; import org.chaos.fx.cnbeta.R; import org.chaos.fx.cnbeta.util.CryptUtil; import org.chaos.fx.cnbeta.wxapi.WXApiProvider; import java.io.File; import butterknife.BindView; import butterknife.ButterKnife; /** * @author Chaos * 16/02/2017 */ public class ImageFragment extends Fragment { private static final String TAG = "ImageFragment"; private static final String KEY_IMAGE_URL = "image_url"; public static ImageFragment newInstance(String url) { Bundle args = new Bundle(); args.putString(KEY_IMAGE_URL, url); ImageFragment fragment = new ImageFragment(); fragment.setArguments(args); return fragment; } private static final String FILE_SUFFIX = ".png"; @BindView(R.id.image) PhotoView mPhotoView; @BindView(R.id.progress) ProgressBar mProgressBar; private String mUrl; private ImageStore mImageStore; private OnPhotoTapListener mImageTapListener = new OnPhotoTapListener() { @Override public void onPhotoTap(ImageView view, float x, float y) { loadImage(); } }; @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { return inflater.inflate(R.layout.fragment_image, container, false); } @Override public void onViewCreated(View view, @Nullable Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); ButterKnife.bind(this, view); mUrl = getArguments().getString(KEY_IMAGE_URL); ViewCompat.setTransitionName(mPhotoView, mUrl); loadImage(); mPhotoView.setOnOutsidePhotoTapListener(new OnOutsidePhotoTapListener() { @Override public void onOutsidePhotoTap(ImageView imageView) { if (getActivity() != null) { getActivity().supportFinishAfterTransition(); } } }); mPhotoView.setOnLongClickListener(new View.OnLongClickListener() { @Override public boolean onLongClick(View v) { registerForContextMenu(v); v.showContextMenu(); unregisterForContextMenu(v); return true; } }); } @Override public void onDestroyView() { super.onDestroyView(); cancelStoreRequest(); Picasso.get().cancelRequest(mPhotoView); } @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) { getActivity().getMenuInflater().inflate(R.menu.image_menu, menu); } @Override public boolean onContextItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.save: final String path = getImageCachePath(); storeImageToLocalIfNeed(path, new Callback() { @Override public void onSuccess() { String message = getString(R.string.format_saved_to_path, path); Toast.makeText(getActivity(), message, Toast.LENGTH_SHORT).show(); } @Override public void onError(Exception e) { failedToStoreImage(e); } }); return true; case R.id.wechat_friends: shareImageToWeChat(false); return true; case R.id.wechat_timeline: shareImageToWeChat(true); return true; case R.id.share_more: shareToMore(); return true; } return false; } private String getImageCachePath() { String fileName = CryptUtil.encryptToMD5(mUrl) + FILE_SUFFIX; return getActivity().getExternalFilesDir(Environment.DIRECTORY_PICTURES) + File.separator + fileName; } private void storeImageToLocalIfNeed(String path, Callback callback) { File f = new File(path); if (f.exists()) { if (callback != null) { callback.onSuccess(); } } else { cancelStoreRequest(); mImageStore = new ImageStore(path, callback); Picasso.get().load(mUrl).into(mImageStore); } } private void cancelStoreRequest() { if (mImageStore != null) { Picasso.get().cancelRequest(mImageStore); } } private void shareImageToWeChat(final boolean toTimeline) { final String path = getImageCachePath(); storeImageToLocalIfNeed(path, new Callback() { @Override public void onSuccess() { WXApiProvider.sharePicture(((BitmapDrawable) mPhotoView.getDrawable()).getBitmap(), path, toTimeline); } @Override public void onError(Exception e) { failedToStoreImage(e); } }); } private void shareToMore() { final String path = getImageCachePath(); storeImageToLocalIfNeed(path, new Callback() { @Override public void onSuccess() { Intent shareIntent = new Intent(Intent.ACTION_SEND); shareIntent.setType("text/jpg"); if (Build.VERSION.SDK_INT >= 24) { shareIntent.putExtra(Intent.EXTRA_STREAM, FileProvider.getUriForFile(getActivity().getApplicationContext(), BuildConfig.APPLICATION_ID + ".provider", new File(path))); shareIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION); } else { shareIntent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(new File(path))); } startActivity(Intent.createChooser(shareIntent, getString(R.string.share_to))); } @Override public void onError(Exception e) { failedToStoreImage(e); } }); } private void failedToStoreImage(Exception e) { String message = e.getMessage(); if (e instanceof NoSpaceLeftException) { message = getString(R.string.no_space_left); } Toast.makeText(getActivity(), message, Toast.LENGTH_SHORT).show(); } private void loadImage() { showLoading(true); Picasso.get().load(mUrl).into(mPhotoView, new Callback() { @Override public void onSuccess() { showLoading(false); mPhotoView.setOnPhotoTapListener(null); if (getActivity() != null) { getActivity().supportStartPostponedEnterTransition(); } } @Override public void onError(Exception e) { showLoading(false); mPhotoView.setImageResource(R.drawable.default_content_image_failed); mPhotoView.setOnPhotoTapListener(mImageTapListener); if (getActivity() != null) { getActivity().supportStartPostponedEnterTransition(); } } }); } private void showLoading(boolean loading) { mProgressBar.setVisibility(loading ? View.VISIBLE : View.GONE); mPhotoView.setVisibility(!loading ? View.VISIBLE : View.GONE); } }