Java 使解析图像填充imageview
大家好,我有一个500x500的解析图像,我希望它适合设置为包装内容的图像视图。目前,imege与视图不匹配,并且经常与其他图像重叠。我可以解析这张图片并让它填充我的图片视图吗(好像我将图片设置为背景而不是src)谢谢Java 使解析图像填充imageview,java,android,image-loading,Java,Android,Image Loading,大家好,我有一个500x500的解析图像,我希望它适合设置为包装内容的图像视图。目前,imege与视图不匹配,并且经常与其他图像重叠。我可以解析这张图片并让它填充我的图片视图吗(好像我将图片设置为背景而不是src)谢谢 图像加载器类 public class ImageLoader { MemoryCache memoryCache=new MemoryCache(); FileCache fileCache; private Map<ImageView, String> i
图像加载器类
public class ImageLoader {
MemoryCache memoryCache=new MemoryCache();
FileCache fileCache;
private Map<ImageView, String> imageViews=Collections.synchronizedMap(new WeakHashMap<ImageView, String>());
ExecutorService executorService;
public ImageLoader(Context context){
fileCache=new FileCache(context);
executorService=Executors.newFixedThreadPool(5);
}
final int stub_id = R.drawable.no_image;
public void DisplayImage(String url, ImageView imageView)
{
imageViews.put(imageView, url);
Bitmap bitmap=memoryCache.get(url);
if(bitmap!=null) {
BitmapDrawable bd = new BitmapDrawable(bitmap);
imageView.setBackgroundDrawable(bd);
}
else
{
queuePhoto(url, imageView);
imageView.setImageResource(stub_id);
}
}
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
//decodes image and scales it to reduce memory consumption
private Bitmap decodeFile(File f){
try {
return BitmapFactory.decodeStream(new FileInputStream(f));
} 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);
}
}
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;
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);
executorService=Executors.newFixedThreadPool(5);
}
最终int stub_id=R.drawable.no_图像;
public void DisplayImage(字符串url,ImageView)
{
put(imageView,url);
位图位图=memoryCache.get(url);
if(位图!=null){
BitmapDrawable bd=新的BitmapDrawable(位图);
imageView.setBackgroundDrawable(bd);
}
其他的
{
队列照片(url、imageView);
setImageResource(存根id);
}
}
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
//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{
返回BitmapFactory.decodeStream(新文件输入流(f));
}catch(filenotfound异常){}
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;
公共摄影加载(字符串u,ImageView i){
url=u;
imageView=i;
}
}
类photoloader实现可运行{
光电负载光电负载;
PhotoLoader(PhotoToLoad PhotoToLoad){
this.photoload=photoToLoad;
}
@凌驾
公开募捐{
if(图像视图重用(光电加载))
回来
位图bmp=getBitmap(photoLoad.url);
memoryCache.put(photoload.url,bmp);
if(图像视图重用(光电加载))
回来
BitmapDisplayer bd=新的BitmapDisplayer(bmp,photoToLoad);
活动a=(活动)photoToLoad.imageView.getContext();
a、 runOnUiThread(bd);
}
}
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){Bitmap=b;PhotoToLoad=p;}
公开募捐
{
if(图像视图重用(光电加载))
回来
if(位图!=null)
photoToLoad.imageView.setImageBitmap(位图);
其他的
photoToLoad.imageView.setImageResource(存根id);
}
}
公共void clearCache(){
memoryCache.clear();
fileCache.clear();
}
}
您的第二个图像视图应该使用layout_-toLeftOf=“@+id/list_-image”
来防止重叠,关于不合适的图像,您可能应该使用scaleType
属性,我想我的问题还不够清楚,我的意思是列表中的不同解析图像第二个年龄视图是一个覆盖。希望这能帮上忙,谢谢
public class ImageLoader {
MemoryCache memoryCache=new MemoryCache();
FileCache fileCache;
private Map<ImageView, String> imageViews=Collections.synchronizedMap(new WeakHashMap<ImageView, String>());
ExecutorService executorService;
public ImageLoader(Context context){
fileCache=new FileCache(context);
executorService=Executors.newFixedThreadPool(5);
}
final int stub_id = R.drawable.no_image;
public void DisplayImage(String url, ImageView imageView)
{
imageViews.put(imageView, url);
Bitmap bitmap=memoryCache.get(url);
if(bitmap!=null) {
BitmapDrawable bd = new BitmapDrawable(bitmap);
imageView.setBackgroundDrawable(bd);
}
else
{
queuePhoto(url, imageView);
imageView.setImageResource(stub_id);
}
}
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
//decodes image and scales it to reduce memory consumption
private Bitmap decodeFile(File f){
try {
return BitmapFactory.decodeStream(new FileInputStream(f));
} 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);
}
}
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();
}
}