在universal loader android中显示高定义url图像时出现问题
朋友们好,我想用通用图像加载器在视图寻呼机中显示幻灯片,所以我设置了下面的代码在universal loader android中显示高定义url图像时出现问题,android,android-viewpager,universal-image-loader,Android,Android Viewpager,Universal Image Loader,朋友们好,我想用通用图像加载器在视图寻呼机中显示幻灯片,所以我设置了下面的代码 public class ViewPagerAdapter extends PagerAdapter { LayoutInflater inflater; ArrayList<ImageData> mList; Activity mActivity; public ViewPagerAdapter(ActivityGallery fragmentViewGaller
public class ViewPagerAdapter extends PagerAdapter {
LayoutInflater inflater;
ArrayList<ImageData> mList;
Activity mActivity;
public ViewPagerAdapter(ActivityGallery fragmentViewGallery,
ArrayList<ImageData> mArrayListImageDatas) {
// TODO Auto-generated constructor stub
mActivity = fragmentViewGallery;
mList=mArrayListImageDatas;
}
@Override
public int getCount() {
return mList.size();
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == ((ImageView) object);
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
((ViewPager) container).removeView((ImageView) object);
}
@Override
public Object instantiateItem(ViewGroup container, final int position) {
int loader = R.drawable.no_homes;
ImageView imageView = new ImageView(mActivity);
ImageLoader imgLoader = new ImageLoader(mActivity);
imgLoader.DisplayImage(
Tag.WebApiImageLink
+ mList.get(position).getImage(), loader, imageView);
((ViewPager) container).addView(imageView, 0);
return imageView;
}
}
public类ViewPagerAdapter扩展了PagerAdapter{
充气机;
阵列列表;
活动能力;
公共视图页面RADAPTER(活动库片段视图库,
ArrayList mArrayListImageDatas){
//TODO自动生成的构造函数存根
mActivity=片段视图库;
mList=mArrayListImageDatas;
}
@凌驾
public int getCount(){
返回mList.size();
}
@凌驾
公共布尔值isViewFromObject(视图,对象){
返回视图==((图像视图)对象);
}
@凌驾
公共项(视图组容器、int位置、对象){
((ViewPager)容器)。移除视图((ImageView)对象);
}
@凌驾
公共对象实例化项(视图组容器,最终int位置){
int loader=R.drawable.no_homes;
ImageView ImageView=新的ImageView(MacActivity);
ImageLoader imgLoader=新的ImageLoader(MacActivity);
imgLoader.DisplayImage(
Tag.webapimagelink
+mList.get(position.getImage(),装入器,imageView);
((ViewPager)容器).addView(imageView,0);
返回图像视图;
}
}
ImageLoader.java
public class ImageLoader {
MemoryCache memoryCache=new MemoryCache();
FileCache fileCache;
Context mContext;
private Map<ImageView, String> imageViews=Collections.synchronizedMap(new WeakHashMap<ImageView, String>());
ExecutorService executorService;
public ImageLoader(Context context){
fileCache=new FileCache(context);
mContext=context;
executorService=Executors.newFixedThreadPool(5);
}
int stub_id = R.drawable.ic_launcher;
public void DisplayImage(String url, int loader, ImageView imageView)
{
stub_id = loader;
imageViews.put(imageView, url);
Bitmap bitmap=memoryCache.get(url);
if(bitmap!=null)
imageView.setImageBitmap(bitmap);
else
{
queuePhoto(url, imageView);
imageView.setImageResource(loader);
}
}
private void queuePhoto(String url, ImageView imageView)
{
PhotoToLoad p=new PhotoToLoad(url, imageView);
executorService.submit(new PhotosLoader(p));
}
private Bitmap getBitmap(String url)
{
File f=fileCache.getFile(url);
//from SD cache
Bitmap b = decodeFile(f);
if(b!=null)
return b;
//from web
try {
Bitmap bitmap=null;
URL imageUrl = new URL(url);
HttpURLConnection conn = (HttpURLConnection)imageUrl.openConnection();
conn.setConnectTimeout(30000);
conn.setReadTimeout(30000);
conn.setInstanceFollowRedirects(true);
InputStream is=conn.getInputStream();
OutputStream os = new FileOutputStream(f);
Utils.CopyStream(is, os);
os.close();
bitmap = decodeFile(f);
return bitmap;
} catch (Exception ex){
ex.printStackTrace();
return null;
}
}
//decodes image and scales it to reduce memory consumption
private Bitmap decodeFile(File f){
try {
//decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(new FileInputStream(f),null,o);
int REQUIRED_SIZE=1000;
int width_tmp=o.outWidth, height_tmp=o.outHeight;
int scale=1;
while(true){
if(width_tmp/2<REQUIRED_SIZE || height_tmp/2<REQUIRED_SIZE)
break;
width_tmp/=2;
height_tmp/=2;
scale*=2;
}
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize=scale;
return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
} catch (FileNotFoundException e) {}
return null;
}
//Task for the queue
private class PhotoToLoad
{
public String url;
public ImageView imageView;
public PhotoToLoad(String u, ImageView i){
url=u;
imageView=i;
}
}
class PhotosLoader implements Runnable {
PhotoToLoad photoToLoad;
PhotosLoader(PhotoToLoad photoToLoad){
this.photoToLoad=photoToLoad;
}
@Override
public void run() {
if(imageViewReused(photoToLoad))
return;
Bitmap bmp=getBitmap(photoToLoad.url);
memoryCache.put(photoToLoad.url, bmp);
if(imageViewReused(photoToLoad))
return;
BitmapDisplayer bd=new BitmapDisplayer(bmp, photoToLoad);
Activity a=(Activity)photoToLoad.imageView.getContext();
a.runOnUiThread(bd);
}
}
public Bitmap roundCornerImage(Bitmap src, float round) {
// Source image size
int width = src.getWidth();
int height = src.getHeight();
// create result bitmap output
Bitmap result = Bitmap.createBitmap(width, height, Config.ARGB_8888);
// set canvas for painting
Canvas canvas = new Canvas(result);
canvas.drawARGB(0, 0, 0, 0);
// configure paint
final Paint paint = new Paint();
paint.setAntiAlias(true);
paint.setColor(Color.BLACK);
// configure rectangle for embedding
final Rect rect = new Rect(0, 0, width, height);
final RectF rectF = new RectF(rect);
// draw Round rectangle to canvas
canvas.drawRoundRect(rectF, round, round, paint);
// create Xfer mode
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
// draw source image to canvas
canvas.drawBitmap(src, rect, rect, paint);
// return final image
return result;
}
boolean imageViewReused(PhotoToLoad photoToLoad){
String tag=imageViews.get(photoToLoad.imageView);
if(tag==null || !tag.equals(photoToLoad.url))
return true;
return false;
}
//Used to display bitmap in the UI thread
class BitmapDisplayer implements Runnable
{
Bitmap bitmap;
PhotoToLoad photoToLoad;
public BitmapDisplayer(Bitmap b, PhotoToLoad p){bitmap=b;photoToLoad=p;}
public void run()
{
if(imageViewReused(photoToLoad))
return;
if(bitmap!=null)
photoToLoad.imageView.setImageBitmap(bitmap);
else
photoToLoad.imageView.setImageResource(stub_id);
}
}
public void clearCache() {
memoryCache.clear();
fileCache.clear();
}
}
公共类ImageLoader{
MemoryCache MemoryCache=新的MemoryCache();
文件缓存文件缓存;
语境;
private Map ImageView=Collections.synchronizedMap(新的WeakHashMap());
执行服务执行服务;
公共图像加载器(上下文){
fileCache=新的fileCache(上下文);
mContext=上下文;
executorService=Executors.newFixedThreadPool(5);
}
int stub_id=R.drawable.ic_启动器;
public void DisplayImage(字符串url、整型加载器、ImageView)
{
存根id=装载机;
put(imageView,url);
位图位图=memoryCache.get(url);
if(位图!=null)
设置图像位图(位图);
其他的
{
队列照片(url、imageView);
setImageResource(加载程序);
}
}
私有void队列照片(字符串url,ImageView)
{
PhotoToLoad p=新的PhotoToLoad(url,imageView);
executorService.submit(新的PhotoLoader(p));
}
私有位图getBitmap(字符串url)
{
文件f=fileCache.getFile(url);
//从SD缓存
位图b=解码文件(f);
如果(b!=null)
返回b;
//从网络
试一试{
位图=空;
URL imageUrl=新URL(URL);
HttpURLConnection conn=(HttpURLConnection)imageUrl.openConnection();
连接设置连接超时(30000);
连接设置读取超时(30000);
conn.setInstanceFollowRedirects(真);
InputStream is=conn.getInputStream();
OutputStream os=新文件OutputStream(f);
Utils.CopyStream(is,os);
os.close();
位图=解码文件(f);
返回位图;
}捕获(例外情况除外){
例如printStackTrace();
返回null;
}
}
//对图像进行解码和缩放以减少内存消耗
私有位图解码文件(文件f){
试一试{
//解码图像大小
BitmapFactory.Options o=新的BitmapFactory.Options();
o、 inJustDecodeBounds=true;
解码流(新的FileInputStream(f),null,o);
所需int_SIZE=1000;
内部宽度=o.向外宽度,高度=o.向外高度;
int标度=1;
while(true){
如果(width_tmp/2SetScaleType=“fitXY”
到您的ImageView
将int scale=1;更改为其他值并选中md:如果我设置ScaleType=“fitXY”,则有时也会出现低分辨率图像,因此在这种情况下它们变得非常模糊setScaleType=“fitXY”
到您的图像视图
将int scale=1;更改为其他值并选中M D:如果我设置ScaleType=“fitXY”,则有时也会出现低分辨率图像,因此在这种情况下它们会变得非常模糊
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<android.support.v4.view.ViewPager
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>