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android - Volley 图像加载器并发修改异常

转载 作者:太空狗 更新时间:2023-10-29 14:50:51 24 4
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我正在使用 volley 图像加载器从服务器加载图像到我的项目中。但在某些情况下,我会收到以下错误和应用程序崩溃。

            java.util.ConcurrentModificationException
at java.util.LinkedList$LinkIterator.next(LinkedList.java:124)
at com.android.volley.toolbox.ImageLoader$4.run(ImageLoader.java:440)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5343)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:700)

我找不到错误的原因和解决方法。请帮助我。

全局.java

import android.app.Application;
import android.text.TextUtils;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.toolbox.ImageLoader;
import com.android.volley.toolbox.Volley;
import com.example.volley.LruBitmapCache;
import java.util.HashMap;
public class Global extends Application{
public static final String TAG = Global.class.getSimpleName();
private RequestQueue mRequestQueue;
private ImageLoader mImageLoader;
private static Global mInstance;
@Override
public void onCreate() {
super.onCreate();
mInstance = this;
}
public static synchronized Global getInstance() {
return mInstance;
}
public RequestQueue getRequestQueue() {
if (mRequestQueue == null) {
mRequestQueue = Volley.newRequestQueue(getApplicationContext());
}
return mRequestQueue;
}
public ImageLoader getImageLoader() {
getRequestQueue();
if (mImageLoader == null) {
mImageLoader = new ImageLoader(this.mRequestQueue,new LruBitmapCache());
}
return this.mImageLoader;
}
public <T> void addToRequestQueue(Request<T> req, String tag) {
req.setTag(TextUtils.isEmpty(tag) ? TAG : tag);
getRequestQueue().add(req);
}
public void cancelPendingRequests(Object tag) {
if (mRequestQueue != null) {
mRequestQueue.cancelAll(tag);
}
}
}

LruBitmapCache.java

import com.android.volley.toolbox.ImageLoader.ImageCache;
import android.graphics.Bitmap;
import android.support.v4.util.LruCache;

public class LruBitmapCache extends LruCache<String, Bitmap> implements ImageCache {
public static int getDefaultLruCacheSize() {
final int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024);
final int cacheSize = maxMemory / 8;

return cacheSize;
}

public LruBitmapCache() {
this(getDefaultLruCacheSize());
}

public LruBitmapCache(int sizeInKiloBytes) {
super(sizeInKiloBytes);
}

@Override
protected int sizeOf(String key, Bitmap value) {
return value.getRowBytes() * value.getHeight() / 1024;
}

@Override
public Bitmap getBitmap(String url) {
return get(url);
}

@Override
public void putBitmap(String url, Bitmap bitmap) {
put(url, bitmap);
}
}

将图像加载到 WebView 中的代码

ImageLoader myLoader = Global.getInstance().getImageLoader();
networkImageView.setImageUrl(thumbnailURL, myLoader);
myLoader.get(thumbnailURL, new ImageLoader.ImageListener() {
@Override
public void onErrorResponse(VolleyError error) {
//Set Error image
}
@Override
public void onResponse(ImageLoader.ImageContainer response, boolean isImmediate) {
if (response.getBitmap() != null) {
//Set BitMap
}
else{
//Set Loading image
}
}
});

My Costume网络查看图片查看监听

public class NetworkImageViewListener {

private final String TAG_THUMBNAIL_ERROR = "THUMBNAIL_ERROR";
private final String TAG_THUMBNAIL_RECEIVED = "THUMBNAIL_RECEIVED";

private String TAG = getClass().getSimpleName();


private boolean original_image_loaded = false;
public void loadImage(final Context context,final String url,final NetworkImageView networkImageView, final int approx_width, final int approx_height,final boolean thumbnail, final ProgressBar progressBar, final boolean is_Store){
networkImageView.setAdjustViewBounds(true);
final int picture_not_found = R.drawable.ic_profile_picture_not_found;
final int picture_not_loaded = R.drawable.ic_profile_picture_not_loaded;

if (url != null && !url.equals("null")&& !url.equals("NULL")&& !url.equals("")) {
final String originalURL = getImageUrl(url, approx_width, approx_height);

final Bitmap cacheImage = getCacheImage(context, originalURL);
if (cacheImage==null) {

if(progressBar!=null){
progressBar.setVisibility(View.VISIBLE);
}
if (thumbnail) {
final String thumbnailURL = getImageThumbnailUrl(url, approx_width, approx_height);

ImageLoader thumbnailLoader = Global.getInstance().getImageLoader();
networkImageView.setImageUrl(thumbnailURL, thumbnailLoader);
thumbnailLoader.get(thumbnailURL, new ImageLoader.ImageListener() {
@Override
public void onErrorResponse(VolleyError error) {
if(progressBar==null){
networkImageView.setImageResource(picture_not_found);
}
networkImageView.setTag(TAG_THUMBNAIL_ERROR);
load_Original(context, originalURL, networkImageView, progressBar, is_Store, picture_not_loaded);
}
@Override
public void onResponse(ImageLoader.ImageContainer response, boolean isImmediate) {
if (response.getBitmap() != null) {
networkImageView.setImageBitmap(response.getBitmap());
networkImageView.setTag(TAG_THUMBNAIL_RECEIVED);
load_Original(context, originalURL, networkImageView, progressBar, is_Store, picture_not_loaded);
} else if (progressBar==null) {
networkImageView.setImageResource(picture_not_found);
}
}
});
}
else{
load_Original(context,originalURL,networkImageView,progressBar,is_Store,picture_not_loaded);
}
} else {
networkImageView.setImageBitmap(cacheImage);
}
} else {
networkImageView.setImageResource(picture_not_found);
}
}
private void load_Original(final Context context,final String originalURL,final NetworkImageView networkImageView, final ProgressBar progressBar, final boolean is_Store,final int picture_not_loaded){
final Drawable temp = networkImageView.getDrawable();
final String imageviewTag = (String) networkImageView.getTag();
ImageLoader imageLoader = Global.getInstance().getImageLoader();
networkImageView.setImageUrl(originalURL, imageLoader);
imageLoader.get(originalURL, new ImageLoader.ImageListener() {
@Override
public void onErrorResponse(VolleyError error) {
if (progressBar != null) {
progressBar.setVisibility(View.GONE);
}
if (temp != null && imageviewTag != null && !imageviewTag.equals(TAG_THUMBNAIL_ERROR)) {
networkImageView.setImageDrawable(temp);
} else if (temp != null && imageviewTag != null && imageviewTag.equals(TAG_THUMBNAIL_RECEIVED)) {
networkImageView.setImageDrawable(temp);
} else {
networkImageView.setImageResource(picture_not_loaded);
}
}

@Override
public void onResponse(ImageLoader.ImageContainer response, boolean shouldAnimate) {
if (response.getBitmap() != null) {
if (progressBar != null) {
progressBar.setVisibility(View.GONE);
}
networkImageView.setImageBitmap(response.getBitmap());
if (is_Store) {
setCacheImage(context, originalURL, response.getBitmap());
}
} else {
networkImageView.setImageDrawable(temp);
}
}
});
}

private static String getImageUrl(String url, int aprox_width, int aprox_height){
int index = url.lastIndexOf('/');
String path = url.substring(0, index);
String file_name = url.substring(index + 1);
String result = path+"/"+aprox_width+"/"+aprox_height+"/"+file_name;
return result;
}

private static String getImageThumbnailUrl(String url, int approx_width, int aprox_height){
int index = url.lastIndexOf('/');
String path = url.substring(0, index);
String file_name = url.substring(index + 1);
String result = path+"/"+approx_width+"/"+aprox_height+"/tbnil"+"/"+file_name;
return result;
}

private String profile_picture_folder_name = "PP";
private void setCacheImage(Context context, String url, Bitmap bitmap){
try {
if (!getCacheDirectory(context).equals("")) {
String filename = getFileName(url);
File folder = new File(getCacheDirectory(context)+"/"+profile_picture_folder_name+"/");
if (!folder.exists()) {
folder.mkdir();
}
if (folder.exists()) {
File dest = new File(folder, filename);
FileOutputStream out = new FileOutputStream(dest);
bitmap.compress(Bitmap.CompressFormat.JPEG, 40, out);
out.flush();
out.close();
}
}
} catch (Exception e) {
Log.developer(TAG,e.getMessage());
}
}
private Bitmap getCacheImage(Context context,String url){
try {
if (!getCacheDirectory(context).equals("")) {
String filename = getFileName(url);
File folder = new File(getCacheDirectory(context)+"/"+profile_picture_folder_name+"/");
if (folder.exists()) {
FileInputStream fis = null;
File imageFile = new File(folder, filename);
if (imageFile.exists()) {
fis = new FileInputStream(imageFile);
return BitmapFactory.decodeStream(fis);
}
}
}
} catch (FileNotFoundException e) {
Log.developer(TAG, e.getMessage());
}
return null;
}
private String getCacheDirectory(Context context){
String cachePath="";
if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState()) || !Environment.isExternalStorageRemovable()) {
if (context.getExternalCacheDir() != null && context.getExternalCacheDir().exists()) {
cachePath = context.getExternalCacheDir().getPath(); // most likely your null value
}
else if (context.getCacheDir() != null && context.getCacheDir().exists()) {
cachePath = context.getCacheDir().getPath();
}
} else {
if (context.getCacheDir() != null && context.getCacheDir().exists()) {
cachePath = context.getCacheDir().getPath();
}
}
return cachePath;
}

public String getFileName(String urlStr) {
return urlStr.substring(urlStr.lastIndexOf('/') + 1, urlStr.length());
}
}

最佳答案

您必须实现两个 ImageLoader,一个用于缩略图,另一个用于全分辨率图像。修改您的 RequestQueue 单例,如下所示:

//..
private ImageLoader mImageLoader;
private ImageLoader mThumbLoader;
//...
// Then in constructor
mThumbLoader = new ImageLoader(mRequestQueue, new ImageLoader.ImageCache() { ... });
mImageLoader = new ImageLoader(mRequestQueue, new ImageLoader.ImageCache() { ... });

// And then you build two getters
protected ImageLoader getImageLoader() {
return mImageLoader;
}

protected ImageLoader getThumbLoader() {
return mThumbLoader;
}

如果您为缩略图调用 mThumbLoader 并为全分辨率图像调用 mImageLoader,它将正常工作。

关于android - Volley 图像加载器并发修改异常,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/35479128/

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