我正在开发一个Android应用程序。现在我将bbcode解析为html并将其显示在textview中，textview位于自定义列表视图中。我使用Html.ImageGetter（）来显示从AsyncTask下载的图像。
适用于少量照片。但是，如果要求应用程序下载40-50张图片，则会创建40-50个任务，这会变得一团糟。每个任务都会打开一个流来下载图像。之后，它将字节解码为位图，调整大小，将它们保存到SD卡并循环使用位图。
现在，如果应用程序正在加载所有这些图像，同时它会使用大量的内存。我设法让它通过48 MB。 16到48之间有一个很大的差距:(。我搜索了如何解决这个问题。我从谷歌下载了AsyncTask代码：
并将池大小设置为3.但这没有帮助。我真的无法弄清楚我在哪里失去了公羊。一旦我把一个大任务队列，我的公羊就疯了。收到一些图像后，它变得最糟糕。我不认为这是图像，因为我可以在显示任何图像之前达到30 mb。该应用程序本身包括视图，信息和服务使用13 MB，其余的都在这里泄露。
队列本身是否会进行大型ram分配？或者是Html.ImageGetter（）以某种方式泄漏了大量的内存？有一个更好的方法吗？
我在这里加载图片：
public void LoadImages(String source) {
myurl = null;
try {
myurl = new URL(source);
} catch (MalformedURLException e) {
e.printStackTrace();
}
new DownloadImageFromPost().execute(myurl);
}
private class DownloadImageFromPost extends AsyncTask<URL, Integer, Bitmap> {
@Override
protected Bitmap doInBackground(URL... params) {
URL url;
Log.d(TAG, "Starting new image download");
try {
url = params[0];
HttpURLConnection connection = (HttpURLConnection) url
.openConnection();
int length = connection.getContentLength();
InputStream is = (InputStream) url.getContent();
byte[] imageData = new byte[length];
int buffersize = (int) Math.ceil(length / (double) 100);
int downloaded = 0;
int read;
while (downloaded < length) {
if (length < buffersize) {
read = is.read(imageData, downloaded, length);
} else if ((length - downloaded) <= buffersize) {
read = is.read(imageData, downloaded, length
- downloaded);
} else {
read = is.read(imageData, downloaded, buffersize);
}
downloaded += read;
publishProgress((downloaded * 100) / length);
}
Bitmap bitmap = BitmapFactory.decodeByteArray(imageData, 0,
length);
if (bitmap != null) {
Log.i(TAG, "Bitmap created");
} else {
Log.i(TAG, "Bitmap not created");
}
is.close();
return bitmap;
} catch (MalformedURLException e) {
Log.e(TAG, "Malformed exception: " + e.toString());
} catch (IOException e) {
Log.e(TAG, "IOException: " + e.toString());
} catch (Exception e) {
}
return null;
}
protected void onPostExecute(Bitmap result) {
String name = Environment.getExternalStorageDirectory() + "/tempthumbs/" + myurl.toString().hashCode() +".jpg";
String rname = Environment.getExternalStorageDirectory() + "/tempthumbs/" + myurl.toString().hashCode() +"-t.jpg";
try {
if (result != null) {
hasExternalStoragePublicPicture(name);
ImageManager manager = new ImageManager(context);
Bitmap rezised = manager.resizeBitmap(result, 300, 300);
saveToSDCard(result, name, myurl.toString().hashCode() +".jpg");
saveToSDCard(rezised, rname, myurl.toString().hashCode() +"-t.jpg");
result.recycle();
rezised.recycle();
} else {
}
} catch(NullPointerException e) {
}
Log.d(TAG, "Sending images loaded announcement");
Intent i = new Intent(IMAGE_LOADED);
i.putExtra("image", name);
i.putExtra("source", myurl.toString());
i.putExtra("class", true);
context.sendBroadcast(i);
}
}
private boolean hasExternalStoragePublicPicture(String name) {
File file = new File(name);
if (file != null) {
file.delete();
}
try {
file.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
return file.exists();
}
public void saveToSDCard(Bitmap bitmap, String name, String nam) {
boolean mExternalStorageAvailable = false;
boolean mExternalStorageWriteable = false;
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
mExternalStorageAvailable = mExternalStorageWriteable = true;
Log.v(TAG, "SD Card is available for read and write "
+ mExternalStorageAvailable + mExternalStorageWriteable);
saveFile(bitmap, name, nam);
} else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
mExternalStorageAvailable = true;
mExternalStorageWriteable = false;
Log.v(TAG, "SD Card is available for read "
+ mExternalStorageAvailable);
} else {
mExternalStorageAvailable = mExternalStorageWriteable = false;
Log.v(TAG, "Please insert a SD Card to save your Video "
+ mExternalStorageAvailable + mExternalStorageWriteable);
}
}
private void saveFile(Bitmap bitmap, String fullname, String nam) {
ContentValues values = new ContentValues();
File outputFile = new File(fullname);
values.put(MediaStore.MediaColumns.DATA, outputFile.toString());
values.put(MediaStore.MediaColumns.TITLE, nam);
values.put(MediaStore.MediaColumns.DATE_ADDED, System
.currentTimeMillis());
values.put(MediaStore.MediaColumns.MIME_TYPE, "image/jpg");
Uri uri = context.getContentResolver().insert(
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
values);;
try {
OutputStream outStream = context.getContentResolver()
.openOutputStream(uri);
bitmap.compress(Bitmap.CompressFormat.JPEG, 95, outStream);
outStream.flush();
outStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
bitmap.recycle();
}
在这里我调用Html.ImageGetter（），这是一个列表getView：
holder.content.setText(Html.fromHtml(
processor.preparePostText(posts.get(position).post_content),
new Html.ImageGetter() {
@Override public Drawable getDrawable(String source) {
Log.d("Forum Service", "image source: " + source);
if (imageSources.contains(source)) {
for (int x = 0; x < imageSources.size(); x++) {
if (source.equals(imageSources.get(x))) {
String tmp = oImages.get(x);
tmp = tmp.substring(0, tmp.length() - 4);
tmp = tmp + "-t.jpg";
Drawable d = Drawable.createFromPath(tmp);
try {
d.setBounds(0, 0, d.getIntrinsicWidth(),
d.getIntrinsicHeight());
} catch (NullPointerException e) {
}
Log.d("Forum Service", "Loaded image froms sdcard");
return d;
}
}
} else if (notLoadedImages.contains(source)) {
Log.d("Forum Service", "Waiting for image");
return null;
} else {
notLoadedImages.add(source);
LoadAllIcons loader = new LoadAllIcons(context);
loader.LoadImages(source);
Log.d("Forum Service", "Asked for image");
return null;
}
return null;
}
}, null));
谢谢！
最后问题是所有任务同时加载。因此在下载时在ram中分配了40个图像。我设法通过在AsyncTask上进行这些修改来限制运行任务的数量：
private static final int CORE_POOL_SIZE = 2;
private static final int MAXIMUM_POOL_SIZE = 2;
private static final int KEEP_ALIVE = 1;
private static final BlockingQueue<Runnable> sWorkQueue =
new LinkedBlockingQueue<Runnable>(100);
答案 0 :(得分：9)