Android 花式封面显示2个位图而不是1个位图
在ImageLoader中,我的Coverflow显示2个图像,而不是1个图像 我的ImageLoader类是:Android 花式封面显示2个位图而不是1个位图,android,android-layout,android-imageview,android-gallery,Android,Android Layout,Android Imageview,Android Gallery,在ImageLoader中,我的Coverflow显示2个图像,而不是1个图像 我的ImageLoader类是: public class ImageLoader { MemoryCache memoryCache = new MemoryCache(); FileCache fileCache; private Map<ImageView, String> imageViews = Collections.synchronizedMap(new WeakHashMap<Im
public class ImageLoader {
MemoryCache memoryCache = new MemoryCache();
FileCache fileCache;
private Map<ImageView, String> imageViews = Collections.synchronizedMap(new WeakHashMap<ImageView, String>());
ExecutorService executorService;
Handler handler = new Handler();// handler to display images in UI thread
Context mContext;
boolean isReflectionEnabled;
public ImageLoader(Context context) {
fileCache = new FileCache(context);
executorService = Executors.newFixedThreadPool(5);
this.mContext = context;
this.stubImageBitmap = BitmapFactory.decodeResource(mContext.getResources(), R.drawable.default_image);
}
final Bitmap stubImageBitmap;
public void displayImageFromUrl(String url, ImageView imageView, boolean isReflectionEnabled) {
imageViews.put(imageView, url);
Bitmap bitmap = memoryCache.get(url);
this.isReflectionEnabled = isReflectionEnabled;
if (bitmap != null) {
if (this.isReflectionEnabled)
imageView.setImageBitmap(createReflectedImage(bitmap));
else
imageView.setImageBitmap(bitmap);
} else {
queuePhoto(url, imageView);
if (this.isReflectionEnabled)
imageView.setImageBitmap(createReflectedImage(stubImageBitmap));
else
imageView.setImageBitmap(stubImageBitmap);
}
}
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);
ActivityUtils.copyStream(is, os);
os.close();
conn.disconnect();
bitmap = decodeFile(f);
return bitmap;
} catch (Throwable ex) {
ex.printStackTrace();
if (ex instanceof OutOfMemoryError)
memoryCache.clear();
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;
FileInputStream stream1 = new FileInputStream(f);
BitmapFactory.decodeStream(stream1, null, o);
stream1.close();
// Find the correct scale value. It should be the power of 2.
final int REQUIRED_SIZE = 70;
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;
}
// decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
FileInputStream stream2 = new FileInputStream(f);
Bitmap bitmap = BitmapFactory.decodeStream(stream2, null, o2);
stream2.close();
return bitmap;
} catch (FileNotFoundException e) {
} catch (IOException e) {
e.printStackTrace();
}
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() {
try {
if (imageViewReused(photoToLoad))
return;
Bitmap bmp = getBitmap(photoToLoad.url);
memoryCache.put(photoToLoad.url, bmp);
if (imageViewReused(photoToLoad))
return;
BitmapDisplayer bd = new BitmapDisplayer(bmp, photoToLoad);
handler.post(bd);
} catch (Throwable th) {
th.printStackTrace();
}
}
}
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) {
if (isReflectionEnabled)
photoToLoad.imageView.setImageBitmap(createReflectedImage(bitmap));
else
photoToLoad.imageView.setImageBitmap(bitmap);
} else {
if (isReflectionEnabled)
photoToLoad.imageView.setImageBitmap(createReflectedImage(stubImageBitmap));
else
photoToLoad.imageView.setImageBitmap(stubImageBitmap);
}
}
}
public void clearCache() {
memoryCache.clear();
fileCache.clear();
}
private Bitmap createReflectedImage(Bitmap originalImage) {
final int reflectionGap = 4;
int width = originalImage.getWidth();
int height = originalImage.getHeight();
// This will not scale but will flip on the Y axis
Matrix matrix = new Matrix();
matrix.preScale(1, -1);
// Create a Bitmap with the flip matrix applied to it.
// We only want the bottom half of the image
Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0, height / 2, width, height / 2, matrix, false);
// Create a new bitmap with same width but taller to fit reflection
Bitmap bitmapWithReflection = Bitmap.createBitmap(width, (height + height / 2), Config.ARGB_8888);
// Create a new Canvas with the bitmap that's big enough for
// the image plus gap plus reflection
Canvas canvas = new Canvas(bitmapWithReflection);
// Draw in the original image
canvas.drawBitmap(originalImage, 0, 0, null);
// Draw in the gap
Paint deafaultPaint = new Paint();
canvas.drawRect(0, height, width, height + reflectionGap, deafaultPaint);
// Draw in the reflection
canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);
// Create a shader that is a linear gradient that covers the reflection
Paint paint = new Paint();
LinearGradient shader = new LinearGradient(0, originalImage.getHeight(), 0, bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP);
// Set the paint to use this shader (linear gradient)
paint.setShader(shader);
// Set the Transfer mode to be porter duff and destination in
paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
// Draw a rectangle using the paint with our linear gradient
canvas.drawRect(0, height, width, bitmapWithReflection.getHeight() + reflectionGap, paint);
return bitmapWithReflection;
}
}
公共类ImageLoader{
MemoryCache MemoryCache=新的MemoryCache();
文件缓存文件缓存;
private Map ImageView=Collections.synchronizedMap(新的WeakHashMap());
执行服务执行服务;
Handler=new Handler();//在UI线程中显示图像的处理程序
语境;
已启用布尔ISreflection;
公共图像加载器(上下文){
fileCache=新的fileCache(上下文);
executorService=Executors.newFixedThreadPool(5);
this.mContext=上下文;
this.stubImageBitmap=BitmapFactory.decodeResource(mContext.getResources(),R.drawable.default_image);
}
最终位图图像位图;
public void displayImageFromUrl(字符串url、ImageView ImageView、布尔值isReflectionEnabled){
put(imageView,url);
位图位图=memoryCache.get(url);
this.isReflectionEnabled=isReflectionEnabled;
if(位图!=null){
如果(此.isReflectionEnabled)
setImageBitmap(CreateReflectImage(位图));
其他的
设置图像位图(位图);
}否则{
队列照片(url、imageView);
如果(此.isReflectionEnabled)
setImageBitmap(createReflectedImage(stubImageBitmap));
其他的
setImageBitmap(stubImageBitmap);
}
}
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);
ActivityUtils.copyStream(is,os);
os.close();
连接断开();
位图=解码文件(f);
返回位图;
}捕获(可丢弃的ex){
例如printStackTrace();
if(ex instanceof OutOfMemoryError)
memoryCache.clear();
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;
FileInputStream stream1=新的FileInputStream(f);
解码流(stream1,null,o);
stream1.close();
//找到正确的刻度值。它应该是2的幂。
所需的最终int_尺寸=70;
内部宽度=o.向外宽度,高度=o.向外高度;
int标度=1;
while(true){
如果(宽度\u tmp/2<所需尺寸| |高度\u tmp/2<所需尺寸)
打破
宽度_tmp/=2;
高度_tmp/=2;
比例*=2;
}
//用inSampleSize解码
BitmapFactory.Options o2=新的BitmapFactory.Options();
o2.inSampleSize=刻度;
FileInputStream stream2=新的FileInputStream(f);
位图位图=BitmapFactory.decodeStream(stream2,null,o2);
stream2.close();
返回位图;
}catch(filenotfounde异常){
}捕获(IOE异常){
e、 printStackTrace();
}
返回null;
}
//队列的任务
私有类光电负载{
公共字符串url;
公共影像视图;
公共PhotoToLoad(字符串u,图像视图i){
url=u;
imageView=i;
}
}
类photoloader实现可运行{
光电负载光电负载;
PhotoLoader(PhotoToLoad PhotoToLoad){
this.photoToLoad=photoToLoad;
}
@凌驾
公开募捐{
试一试{
if(图像视图重用(光电加载))
返回;
位图bmp=getBitmap(photoLoad.url);
memoryCache.put(photoload.url,bmp);
if(图像视图重用(光电加载))
返回;
BitmapDisplayer bd=新的BitmapDisplayer(bmp,photoToLoad);
邮政署署长(屋宇署);
}捕获(可丢弃){
th.printStackTrace();
}
}
}
布尔图像视图(PhotoToLoad PhotoToLoad){
String tag=imageViews.get(photoload.imageView);
if(tag==null | |!tag.equals(photoload.url))
返回true;
返回false;
}
//用于在UI线程中显示位图
类BitmapDisplayer实现可运行{
位图;
光电负载光电负载;
公共位图显示器(位图b、PhotoToLoad p){
位图=b;
光电负载=p;
}
公开募捐{
if(图像视图重用(光电加载))
返回;
if(位图!=null){
如果(isReflectionEnabled)
photoToLoad.imageView.setImageBitmap(创建反射图像(位图));
其他的
photoToLoad.imageView.setImageBitmap(位图);
}否则{
如果(isReflectionEnabled)
photoToLoad.imageView.setImageBitmap(createReflectedImage(stubImageBitmap));
其他的
photoToLoad.imageView.setImageBitmap(stubImageBitmap);
}
}
}
公共void clearCache(){
memoryCache.clear();
fileCache.clear();
}
专用位图CreateReflectImage(位图原始图像){
最终反射率ap=4;
int width=originalImage.getWidth();
int height=originalImage.getHeight();
//这不会缩放,但会在Y轴上翻转
矩阵=新矩阵();
矩阵。预标度(1,-1);
//创建应用翻转矩阵的位图。
//我们只想要
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
@Override
protected void dispatchDraw(Canvas canvas) {
View childView = getChildAt(0);
if (childView != null) {
// If on honeycomb or newer, cache the view.
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
if (childView.isDirty() && !childView.isDrawingCacheEnabled()) {
childView.draw(this.wrappedViewDrawingCanvas);
// Edited by @Gorcyn
{
childView.setDrawingCacheQuality(View.DRAWING_CACHE_QUALITY_HIGH);
childView.setDrawingCacheEnabled(true);
}
if (this.isReflectionEnabled) {
this.createReflectedImages();
}
}
} else {
childView.draw(this.wrappedViewDrawingCanvas);
}
}
canvas.drawBitmap(this.wrappedViewBitmap, (this.getWidth() - childView.getWidth()) / 2, 0, this.paint);
}