i am displaying images in listview and getting out of memory error any one guide me what is the solution to this problem here is my code
我在listview中显示图像，并得到内存错误任何一个都可以指导我解决这个问题的方法是我的代码
LogCat
LogCat
ERROR/AndroidRuntime(1010): java.lang.OutOfMemoryError: bitmap size exceeds VM budget
ERROR/AndroidRuntime(1010): at android.graphics.BitmapFactory.nativeDecodeByteArray(Native Method)
ERROR/AndroidRuntime(1010): at android.graphics.BitmapFactory.decodeByteArray(BitmapFactory.java:405)
ERROR/AndroidRuntime(1010): at android.graphics.BitmapFactory.decodeByteArray(BitmapFactory.java:418)
ERROR/AndroidRuntime(1010): at com.Adapters.AdapterTours.getView(AdapterTours.java:73)
ERROR/AndroidRuntime(1010): at android.widget.AbsListView.obtainView(AbsListView.java:1409)
ERROR/AndroidRuntime(1010): at android.widget.ListView.makeAndAddView(ListView.java:1745)
ERROR/AndroidRuntime(1010): at android.widget.ListView.fillUp(ListView.java:700)
ERROR/AndroidRuntime(1010): at android.widget.ListView.fillGap(ListView.java:646)
ERROR/AndroidRuntime(1010): at android.widget.AbsListView.trackMotionScroll(AbsListView.java:3399)
ERROR/AndroidRuntime(1010): at android.widget.AbsListView.onTouchEvent(AbsListView.java:2233)
ERROR/AndroidRuntime(1010): at android.widget.ListView.onTouchEvent(ListView.java:3446)
ERROR/AndroidRuntime(1010): at android.view.View.dispatchTouchEvent(View.java:3885)
ERROR/AndroidRuntime(1010): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:903)
ERROR/AndroidRuntime(1010): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
ERROR/AndroidRuntime(1010): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
ERROR/AndroidRuntime(1010): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
ERROR/AndroidRuntime(1010): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
ERROR/AndroidRuntime(1010): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1691)
ERROR/AndroidRuntime(1010): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1125)
ERROR/AndroidRuntime(1010): at android.app.Activity.dispatchTouchEvent(Activity.java:2096)
ERROR/AndroidRuntime(1010): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1675)
ERROR/AndroidRuntime(1010): at android.view.ViewRoot.deliverPointerEvent(ViewRoot.java:2194)
ERROR/AndroidRuntime(1010): at android.view.ViewRoot.handleMessage(ViewRoot.java:1878)
ERROR/AndroidRuntime(1010): at android.os.Handler.dispatchMessage(Handler.java:99)
ERROR/AndroidRuntime(1010): at android.os.Looper.loop(Looper.java:130)
ERROR/AndroidRuntime(1010): at android.app.ActivityThread.main(ActivityThread.java:3683)
ERROR/AndroidRuntime(1010): at java.lang.reflect.Method.invokeNative(Native Method)
ERROR/AndroidRuntime(1010): at java.lang.reflect.Method.invoke(Method.java:507)
ERROR/AndroidRuntime(1010): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
ERROR/AndroidRuntime(1010): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
ERROR/AndroidRuntime(1010): at dalvik.system.NativeStart.main(Native Method)
GetView Method
GetView方法
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (cOnvertView== null) {
cOnvertView= mInflater.inflate(R.layout.list_tours, null);
holder = new ViewHolder();
holder.tourTitle = (TextView) convertView.findViewById(R.id.tourTitle);
holder.tourIcon = (ImageView) convertView.findViewById(R.id.tourIcon);
holder.tourDetail = (TextView) convertView.findViewById(R.id.tourDetail);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
DalTours tour = getItem(position);
String tempTag = String.valueOf(tour.getId());
holder.tourIcon.setTag(tempTag);
if(tour.getImageByteArray() != null)
{
Bitmap image = BitmapFactory.decodeByteArray(tour.getImageByteArray(), 0, tour.getImageByteArray().length);
holder.tourIcon.setImageDrawable(getScaledImage(image));
image = null;
}else
{
holder.tourIcon.setTag(tour);
Bitmap cachedImage = ImageLoader.loadBitmap(tour,new ImageLoader.ImageCallback() {
@Override
public void imageLoaded(Bitmap imageBitmap, DalTours tour) {
ImageView image = (ImageView)listview.findViewWithTag(tour);
if(image != null)
{
try
{
ByteArrayOutputStream stream = new ByteArrayOutputStream();
if(imageBitmap != null)
{
image.setImageDrawable(getScaledImage(imageBitmap));
imageBitmap.compress(CompressFormat.PNG, 0 ,stream);
byte[] bitmapdata = stream.toByteArray();
tours.get(position).setImageByteArray(bitmapdata);
}
stream = null;
}finally
{
}
}
}
});
holder.tourIcon.setImageDrawable(getScaledImage(cachedImage));
}
holder.tourTitle.setText(tours.get(position).getTitle());
holder.tourDetail.setText(tours.get(position).getDetail());
return convertView;
}
image Scale Function
图像比例尺功能
public Drawable getScaledImage(Bitmap actualBitmap)
{
BitmapDrawable bmd= null;
if(actualBitmap != null)
{
int width = actualBitmap.getWidth();
int height = actualBitmap.getHeight();
Activity parent = (Activity)context;
Display display = parent.getWindowManager().getDefaultDisplay();
int Screenwidth = display.getWidth();
int Screenheight = display.getHeight();
float newWidth = (Screenwidth*35)/100;
float temp = newWidth / width;
float newHeight = temp * height;
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
Matrix matrix = new Matrix();
matrix.postScale(scaleWidth, scaleHeight);
Bitmap resizedBitmap = Bitmap.createBitmap(actualBitmap, 0, 0,
width, height, matrix, true);
bmd = new BitmapDrawable(resizedBitmap);
}
return bmd;
}
Image Loader Class
图像加载器类
public class ImageLoader {
private static HashMap> imageCache;
public ImageLoader() {
//imageCache = new HashMap>();
}
public static Bitmap loadBitmap(final DalTours tour, final ImageCallback imageCallback) {
if(imageCache == null)
imageCache = new HashMap>();
if (imageCache.containsKey(tour.getImageurl())) {
SoftReference softReference = imageCache.get(tour.getImageurl());
Bitmap Bitmap = softReference.get();
if (Bitmap != null) {
return Bitmap;
}
}
final Handler handler = new Handler() {
@Override
public void handleMessage(Message message) {
imageCallback.imageLoaded((Bitmap) message.obj, tour);
}
};
new Thread() {
@Override
public void run() {
Bitmap Bitmap = loadImageFromUrl(tour.getImageurl());
imageCache.put(tour.getImageurl(), new SoftReference(Bitmap));
Message message = handler.obtainMessage(0, Bitmap);
handler.sendMessage(message);
}
}.start();
return null;
}
public static Bitmap loadImageFromUrl(String url) {
Bitmap bm;
try {
URL aURL = new URL(url);
URLConnection cOnn= aURL.openConnection();
conn.connect();
InputStream is = null;
try
{
is= conn.getInputStream();
}catch(IOException e)
{
return null;
}
BufferedInputStream bis = new BufferedInputStream(is);
bm = BitmapFactory.decodeStream(bis);
bis.close();
is.close();
} catch (IOException e) {
return null;
}
return bm;
}
public interface ImageCallback {
public void imageLoaded(Bitmap imageBitmap, DalTours tour);
}
}
any help would be apprecicated
任何帮助都是值得感激的
25
For Solving java.lang.OutOfMemoryError Exception at android.graphics.BitmapFactory.nativeDecodeByteArray, you should use Following Code:
求解. lang。在android.graphics.BitmapFactory OutOfMemoryError异常。nativedecoytearray，应该使用以下代码:
BitmapFactory.Options optiOns=new BitmapFactory.Options();// Create object of bitmapfactory's option method for further option use
options.inPurgeable = true; // inPurgeable is used to free up memory while required
Bitmap songImage1 = BitmapFactory.decodeByteArray(thumbnail,0, thumbnail.length,options);//Decode image, "thumbnail" is the object of image file
Bitmap sOngImage= Bitmap.createScaledBitmap(songImage1, 50 , 50 , true);// convert decoded bitmap into well scalled Bitmap format.
imageview.SetImageDrawable(songImage);
6
finally i solve this high resolution image issue which was causing out of memory error using following thread Large Image Manipulation
最后，我解决了这个高分辨率的图像问题，这是由于使用以下线程的大图像处理导致内存错误。
and here is my code for downloading and scaling image according to your required size.
这是我下载和缩放图像的代码，根据你需要的大小。
no more custom scaling function required!!!
不再需要自定义缩放功能!!
public static Bitmap loadImageFromUrl(String url) {
Bitmap bm;
try {
URL aURL = new URL(url);
URLConnection cOnn= aURL.openConnection();
conn.connect();
InputStream is = null;
try
{
is= conn.getInputStream();
}catch(IOException e)
{
return null;
}
BufferedInputStream bis = new BufferedInputStream(is);
bm = BitmapFactory.decodeStream(bis);
bis.close();
is.close();
} catch (IOException e) {
return null;
}
return Bitmap.createScaledBitmap(bm,100,100,true);
}
3
you have to recycle bitmap. The bitmap implementation is native, so the java object is small and a poor candidate for java garbage collection but the memory is still allocated. Taka a look to Bitmap.recycle()
你必须回收位图。位图实现是本地的，所以java对象很小，不适合java垃圾收集，但是内存仍然被分配。查看bitmap . recycling ()
-1
It is definitely a case of having a bitmap for a large image in the memory. If you are repeatedly doing this operation then its good to recycle the bitmap every time. However, just recycling does not guarantee that the memory is freed, its barely marked for garbage collection. So, as an additional step, you should take care of garbage collection too.
这绝对是一个在内存中有一个大图像的位图的例子。如果您反复做这个操作，那么每次都可以回收位图。然而，仅仅是回收并不保证释放内存，它几乎没有标记为垃圾收集。因此，作为一个附加步骤，您也应该处理垃圾收集。
Use this code;
使用这段代码;
Bitmap mybitmap = ....; // you are getting the bitmap here
mybitmap.recycle();
System.gc(); // the above recycling may not be enough always
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