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 com.cvte.LiZhiDemo.Activity; import java.util.ArrayList; import com.cvte.LiZhiDemo.R; import com.cvte.LiZhiDemo.BaseClass.Constants.Extra; import com.nostra13.universalimageloader.core.DisplayImageOptions; import com.nostra13.universalimageloader.core.ImageLoader; import com.nostra13.universalimageloader.core.assist.ImageScaleType; import com.nostra13.universalimageloader.core.display.FadeInBitmapDisplayer; import com.nostra13.universalimageloader.core.listener.SimpleImageLoadingListener; import com.nostra13.universalimageloader.core.assist.FailReason; import com.umeng.analytics.MobclickAgent; import android.app.Activity; 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.support.v4.view.ViewPager.OnPageChangeListener; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.view.Window; import android.widget.ImageButton; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.ProgressBar; /** * ViewPager??Activity * @author Sergey Tarasevich (nostra13[at]gmail[dot]com) */ public class ImagePagerActivity extends Activity { private static final String STATE_POSITION = "STATE_POSITION"; DisplayImageOptions options; //?????? private ImageView[] points; //??? private int currentIndex; ViewPager pager; private LinearLayout mainLayout; private MyPageChangeListener myPageChangeListener; private ImageButton btCloss; @Override protected void onResume() { super.onResume(); MobclickAgent.onResume(this); } public void onPause() { super.onPause(); MobclickAgent.onPause(this); } public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.lizhi_image_pager_layout); btCloss = new ImageButton(this); btCloss = (ImageButton) findViewById(R.id.close); btCloss.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { finish(); } }); ArrayList<String> imageUrls = getIntent().getStringArrayListExtra(Extra.IMAGES); // ??View? int pagerPosition = getIntent().getIntExtra(Extra.IMAGE_POSITION, 0); // ?? if (savedInstanceState != null) { pagerPosition = savedInstanceState.getInt(STATE_POSITION); } /** * ???? */ initPoint(imageUrls.size()); options = new DisplayImageOptions.Builder().resetViewBeforeLoading(true).cacheInMemory(true) .imageScaleType(ImageScaleType.EXACTLY).bitmapConfig(Bitmap.Config.RGB_565) .displayer(new FadeInBitmapDisplayer(300)).build(); pager = (ViewPager) findViewById(R.id.pager); pager.setAdapter(new ImagePagerAdapter(imageUrls)); pager.setCurrentItem(pagerPosition); points[pagerPosition].setEnabled(true); pager.setOnPageChangeListener(new MyPageChangeListener()); } /**???? * @param * @return */ private void initPoint(int picNum) { LinearLayout linearLayout = (LinearLayout) findViewById(R.id.point_layout); points = new ImageView[4]; for (int i = 0; i < 4; i++) { points[i] = (ImageView) linearLayout.getChildAt(i); points[i].setEnabled(false); //?????? //points[i].setOnClickListener(this); points[i].setTag(i); } for (int i = picNum; i < 4; i++) { points[i] = (ImageView) linearLayout.getChildAt(i); points[i].setVisibility(View.GONE); } } @Override public void onSaveInstanceState(Bundle outState) { // ??? outState.putInt(STATE_POSITION, pager.getCurrentItem()); } private class ImagePagerAdapter extends PagerAdapter { private ArrayList<String> images; private LayoutInflater inflater; ImagePagerAdapter(ArrayList<String> images) { this.images = images; inflater = getLayoutInflater(); } @Override public void destroyItem(ViewGroup container, int position, Object object) { ((ViewPager) container).removeView((View) object); } @Override public void finishUpdate(View container) { } @Override public int getCount() { return images.size(); } @Override public Object instantiateItem(ViewGroup view, int position) { View imageLayout = inflater.inflate(R.layout.lizhi_pager_image_layout, view, false); ImageView imageView = (ImageView) imageLayout.findViewById(R.id.image); final ProgressBar spinner = (ProgressBar) imageLayout.findViewById(R.id.loading); ImageLoader.getInstance().displayImage(images.get(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: // ?I/O message = "Input/Output error"; break; case DECODING_ERROR: // message = "Image can't be decoded"; break; case NETWORK_DENIED: // message = "Downloads are denied"; 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); // ? } }); ((ViewPager) view).addView(imageLayout, 0); // ????ViewPager 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; } @Override public void startUpdate(View container) { } } public class MyPageChangeListener implements OnPageChangeListener { @Override public void onPageScrollStateChanged(int arg0) { } @Override public void onPageScrolled(int arg0, float arg1, int arg2) { } @Override public void onPageSelected(int position) { Log.d("ImagePager", position + ""); for (int i = 0; i < 4; i++) { if (i == position) { points[i].setEnabled(true); } else { points[i].setEnabled(false); } } } } }