Java tutorial
/******************************************************************************* * Copyright 2011, 2012 Chris Banes. * * 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 uk.co.senab.photoview.sample; import android.app.Activity; import android.graphics.Bitmap; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.MenuItem.OnMenuItemClickListener; import android.view.View; import android.view.ViewGroup; import android.widget.ProgressBar; import android.widget.Toast; import com.nostra13.universalimageloader.core.DisplayImageOptions; import com.nostra13.universalimageloader.core.ImageLoader; import com.nostra13.universalimageloader.core.assist.FailReason; import com.nostra13.universalimageloader.core.assist.ImageScaleType; import com.nostra13.universalimageloader.core.display.FadeInBitmapDisplayer; import com.nostra13.universalimageloader.core.listener.SimpleImageLoadingListener; import base.wrf.com.wrfbase.R; import uk.co.senab.photoview.PhotoView; import uk.co.senab.photoview.PhotoViewAttacher; /** * Lock/Unlock button is added to the ActionBar. * Use it to temporarily disable ViewPager navigation in order to correctly interact with ImageView by gestures. * Lock/Unlock state of ViewPager is saved and restored on configuration changes. * * Julia Zudikova */ public class ImagePagerActivity extends Activity { private static final String ISLOCKED_ARG = "isLocked"; private ViewPager mViewPager; private MenuItem menuLockItem; private String[] imageUrls; DisplayImageOptions options; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_view_pager); mViewPager = (HackyViewPager) findViewById(R.id.view_pager); setContentView(mViewPager); Bundle bundle = getIntent().getExtras(); imageUrls = bundle.getStringArray("images"); if (imageUrls == null) { this.finish(); return; } int pagerPosition = bundle.getInt("position", 0); SamplePagerAdapter adapter = new SamplePagerAdapter(imageUrls); mViewPager.setAdapter(adapter); mViewPager.setCurrentItem(pagerPosition); if (savedInstanceState != null) { boolean isLocked = savedInstanceState.getBoolean(ISLOCKED_ARG, false); ((HackyViewPager) mViewPager).setLocked(isLocked); } options = new DisplayImageOptions.Builder().showImageForEmptyUri(R.mipmap.ic_empty) .showImageOnFail(R.mipmap.ic_error).resetViewBeforeLoading(true).cacheOnDisc(true) .imageScaleType(ImageScaleType.EXACTLY).bitmapConfig(Bitmap.Config.RGB_565).considerExifParams(true) .displayer(new FadeInBitmapDisplayer(300)).build(); } class SamplePagerAdapter extends PagerAdapter { private String[] imageUrls; @Override public int getCount() { return imageUrls.length; } public SamplePagerAdapter(String[] imagUrls) { super(); this.imageUrls = imagUrls; } public void setImagUrls(String[] imagUrls) { this.imageUrls = imagUrls; } @Override public View instantiateItem(ViewGroup container, int position) { View imageLayout = LayoutInflater.from(ImagePagerActivity.this).inflate(R.layout.item_pager_image, container, false); PhotoView imageView = (PhotoView) imageLayout.findViewById(R.id.image); imageLayout.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { ImagePagerActivity.this.finish(); } }); imageView.setOnViewTapListener(new PhotoViewAttacher.OnViewTapListener() { @Override public void onViewTap(View view, float x, float y) { ImagePagerActivity.this.finish(); } }); final ProgressBar spinner = (ProgressBar) imageLayout.findViewById(R.id.loading); // ImageLoader.getInstance().getDiscCache().get(imageUrls[position]).getPath(); ImageLoader.getInstance().displayImage(imageUrls[position], imageView, options, new SimpleImageLoadingListener() { @Override public void onLoadingStarted(String imageUri, View view) { spinner.setVisibility(View.VISIBLE); } @Override public void onLoadingFailed(String imageUri, View view, FailReason failReason) { String message = null; switch (failReason.getType()) { case IO_ERROR: message = ""; break; case DECODING_ERROR: message = "Image can't be decoded"; break; case NETWORK_DENIED: message = "Downloads are denied"; break; case OUT_OF_MEMORY: message = "?"; break; case UNKNOWN: message = "Unknown error"; break; } Toast.makeText(ImagePagerActivity.this, message, Toast.LENGTH_SHORT).show(); spinner.setVisibility(View.GONE); } @Override public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) { spinner.setVisibility(View.GONE); } }); container.addView(imageLayout, 0); return imageLayout; } @Override public void destroyItem(ViewGroup container, int position, Object object) { container.removeView((View) object); } @Override public boolean isViewFromObject(View view, Object object) { return view == object; } } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.viewpager_menu, menu); return super.onCreateOptionsMenu(menu); } @Override public boolean onPrepareOptionsMenu(Menu menu) { menuLockItem = menu.findItem(R.id.menu_lock); toggleLockBtnTitle(); menuLockItem.setOnMenuItemClickListener(new OnMenuItemClickListener() { @Override public boolean onMenuItemClick(MenuItem item) { toggleViewPagerScrolling(); toggleLockBtnTitle(); return true; } }); return super.onPrepareOptionsMenu(menu); } private void toggleViewPagerScrolling() { if (isViewPagerActive()) { ((HackyViewPager) mViewPager).toggleLock(); } } private void toggleLockBtnTitle() { boolean isLocked = false; if (isViewPagerActive()) { isLocked = ((HackyViewPager) mViewPager).isLocked(); } String title = (isLocked) ? getString(R.string.menu_unlock) : getString(R.string.menu_lock); if (menuLockItem != null) { menuLockItem.setTitle(title); } } private boolean isViewPagerActive() { return (mViewPager != null && mViewPager instanceof HackyViewPager); } @Override protected void onSaveInstanceState(@NonNull Bundle outState) { if (isViewPagerActive()) { outState.putBoolean(ISLOCKED_ARG, ((HackyViewPager) mViewPager).isLocked()); } super.onSaveInstanceState(outState); } }