Java tutorial
/******************************************************************************* * Copyright 2011-2013 Sergey Tarasevich * * 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 shirantech.gonepal.app.activities; import android.graphics.Bitmap; import android.os.Bundle; import android.os.Parcelable; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; 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.TextView; 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 shirantech.gonepal.app.R; public class ImagePagerActivity extends BaseActivity { private static final String STATE_POSITION = "STATE_POSITION"; public static String EXTRA_IMAGES = "images"; public static String EXTRA_IMAGE_POSITION = "image_postion"; public static String EXTRA_IMAGES_TEXT = "images_caption"; public static String EXTRA_TITLE = "activity_title"; private DisplayImageOptions options; private ViewPager pager; private String activityTitle = ""; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.ac_image_pager); // setUpActionbar(); Bundle bundle = getIntent().getExtras(); assert bundle != null; String[] imageUrls = bundle.getStringArray(EXTRA_IMAGES); String[] captions = bundle.getStringArray(EXTRA_IMAGES_TEXT); int pagerPosition = bundle.getInt(EXTRA_IMAGE_POSITION, 0); activityTitle = bundle.getString(EXTRA_TITLE); setActionbarTitle(activityTitle); if (savedInstanceState != null) { pagerPosition = savedInstanceState.getInt(STATE_POSITION); } options = new DisplayImageOptions.Builder().showImageForEmptyUri(R.drawable.ic_launcher) .showImageOnFail(R.drawable.ic_launcher).resetViewBeforeLoading(true).cacheOnDisk(true) .imageScaleType(ImageScaleType.EXACTLY).bitmapConfig(Bitmap.Config.RGB_565).considerExifParams(true) .displayer(new FadeInBitmapDisplayer(300)).build(); pager = (ViewPager) findViewById(R.id.pager); pager.setAdapter(new ImagePagerAdapter(imageUrls, captions)); pager.setCurrentItem(pagerPosition); } /* private void setUpActionbar(){ ActionBar actionBar = getSupportActionBar(); actionBar.setDisplayShowHomeEnabled(true); actionBar.setDisplayHomeAsUpEnabled(true); actionBar.setDisplayUseLogoEnabled(true); }*/ @Override public boolean onOptionsItemSelected(MenuItem item) { if (item.getItemId() == android.R.id.home) { finish(); } return super.onOptionsItemSelected(item); } @Override public void onSaveInstanceState(Bundle outState) { outState.putInt(STATE_POSITION, pager.getCurrentItem()); } private class ImagePagerAdapter extends PagerAdapter { private String[] images; private String[] captions; private LayoutInflater inflater; ImageLoader imageloader; ImagePagerAdapter(String[] images, String[] captions) { this.images = images; this.captions = captions; inflater = getLayoutInflater(); imageloader = ImageLoader.getInstance(); } @Override public void destroyItem(ViewGroup container, int position, Object object) { container.removeView((View) object); } @Override public int getCount() { return images.length; } @Override public Object instantiateItem(ViewGroup view, int position) { View imageLayout = inflater.inflate(R.layout.item_pager_image, view, false); assert imageLayout != null; ImageView imageView = (ImageView) imageLayout.findViewById(R.id.image); TextView imageCaption = (TextView) imageLayout.findViewById(R.id.tv_pager_image_name); imageCaption.setText(captions[position]); final ProgressBar spinner = (ProgressBar) imageLayout.findViewById(R.id.loading); imageloader.displayImage(images[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 = "Input/Output error"; break; case DECODING_ERROR: message = "Image can't be decoded"; break; case NETWORK_DENIED: message = "No network"; break; case OUT_OF_MEMORY: message = "Out Of Memory error"; 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); } }); view.addView(imageLayout, 0); return imageLayout; } @Override public boolean isViewFromObject(View view, Object object) { return view.equals(object); } @Override public void restoreState(Parcelable state, ClassLoader loader) { } @Override public Parcelable saveState() { return null; } } }