我正在尝试从"url"加载图像，该文件夹是我的SD卡中的文件夹，其中包含大约40张图像，但我一直收到内存不足错误。 有没有办法解决它？ 可能是因为我试图一次加载 40 张图像，这就是导致错误的原因吗？
下面是我的日志输出
02-01 15:38:17.410: D/url(10695): /mnt/sdcard/Android/data/com.sfa.coverflow/Issues/20/1944628064
02-01 15:38:17.440: D/dalvikvm(10695): GC_FOR_ALLOC freed 7144K, 32% free 16978K/24711K, paused 23ms
02-01 15:38:17.440: I/dalvikvm-heap(10695): Forcing collection of SoftReferences for 33033616-byte allocation
02-01 15:38:17.460: D/dalvikvm(10695): GC_BEFORE_OOM freed 9K, 32% free 16969K/24711K, paused 25ms
02-01 15:38:17.460: E/dalvikvm-heap(10695): Out of memory on a 33033616-byte allocation.
02-01 15:38:17.460: I/dalvikvm(10695): "AsyncTask #5" prio=5 tid=17 RUNNABLE
02-01 15:38:17.460: I/dalvikvm(10695): | group="main" sCount=0 dsCount=0 obj=0x411358f0 self=0x468d20
02-01 15:38:17.460: I/dalvikvm(10695): | sysTid=10718 nice=10 sched=0/0 cgrp=bg_non_interactive handle=3779488
02-01 15:38:17.460: I/dalvikvm(10695): | schedstat=( 48743000 7345000 28 ) utm=4 stm=0 core=1
02-01 15:38:17.460: I/dalvikvm(10695): at android.graphics.BitmapFactory.nativeDecodeStream(Native Method)
02-01 15:38:17.460: I/dalvikvm(10695): at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:493)
02-01 15:38:17.460: I/dalvikvm(10695): at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:299)
02-01 15:38:17.460: I/dalvikvm(10695): at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:324)
02-01 15:38:17.460: I/dalvikvm(10695): at com.sfa.touchview.UrlTouchImageView$ImageLoadTask.doInBackground(UrlTouchImageView.java:108)
02-01 15:38:17.460: I/dalvikvm(10695): at com.sfa.touchview.UrlTouchImageView$ImageLoadTask.doInBackground(UrlTouchImageView.java:1)
02-01 15:38:17.460: I/dalvikvm(10695): at android.os.AsyncTask$2.call(AsyncTask.java:264)
02-01 15:38:17.460: I/dalvikvm(10695): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
02-01 15:38:17.460: I/dalvikvm(10695): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
02-01 15:38:17.460: I/dalvikvm(10695): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
02-01 15:38:17.460: I/dalvikvm(10695): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
02-01 15:38:17.460: I/dalvikvm(10695): at java.lang.Thread.run(Thread.java:856)
02-01 15:38:17.460: D/skia(10695): --- decoder->decode returned false
02-01 15:38:17.470: W/dalvikvm(10695): threadid=17: thread exiting with uncaught exception (group=0x40a4f1f8)
02-01 15:38:17.470: E/AndroidRuntime(10695): FATAL EXCEPTION: AsyncTask #5
02-01 15:38:17.470: E/AndroidRuntime(10695): java.lang.RuntimeException: An error occured while executing doInBackground()
02-01 15:38:17.470: E/AndroidRuntime(10695): at android.os.AsyncTask$3.done(AsyncTask.java:278)
02-01 15:38:17.470: E/AndroidRuntime(10695): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
02-01 15:38:17.470: E/AndroidRuntime(10695): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
02-01 15:38:17.470: E/AndroidRuntime(10695): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
02-01 15:38:17.470: E/AndroidRuntime(10695): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
02-01 15:38:17.470: E/AndroidRuntime(10695): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
02-01 15:38:17.470: E/AndroidRuntime(10695): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
02-01 15:38:17.470: E/AndroidRuntime(10695): at java.lang.Thread.run(Thread.java:856)
02-01 15:38:17.470: E/AndroidRuntime(10695): Caused by: java.lang.OutOfMemoryError
02-01 15:38:17.470: E/AndroidRuntime(10695): at android.graphics.BitmapFactory.nativeDecodeStream(Native Method)
02-01 15:38:17.470: E/AndroidRuntime(10695): at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:493)
02-01 15:38:17.470: E/AndroidRuntime(10695): at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:299)
02-01 15:38:17.470: E/AndroidRuntime(10695): at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:324)
02-01 15:38:17.470: E/AndroidRuntime(10695): at com.sfa.touchview.UrlTouchImageView$ImageLoadTask.doInBackground(UrlTouchImageView.java:108)
02-01 15:38:17.470: E/AndroidRuntime(10695): at com.sfa.touchview.UrlTouchImageView$ImageLoadTask.doInBackground(UrlTouchImageView.java:1)
02-01 15:38:17.470: E/AndroidRuntime(10695): at android.os.AsyncTask$2.call(AsyncTask.java:264)
02-01 15:38:17.470: E/AndroidRuntime(10695): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
02-01 15:38:17.470: E/AndroidRuntime(10695): ... 4 more
这是发生错误的地方
public class ImageLoadTask extends AsyncTask<String, Integer, Bitmap>
{
//RETRIEVES LINK FROM GALLERYACTIVITY
//READ MNT/SDCARD/....
@Override
protected Bitmap doInBackground(String... strings) {
bm = null;
String url = strings[0];
Log.d("url",url);
bm = BitmapFactory.decodeFile(url);
return bm;
}
使用以下代码调整位图的大小。
例如，如果您在 300 * 300 的视图中加载具有 1200 *800
的图像您可以使用decodeSampledBitmapFromResource(getResource(),R.drawable.mImage,300,300)降低内存利用率。
/**
*
* get a resized bitmap
* @param bm
* @param newHeight
* @param newWidth
* @return
*/
public static Bitmap getResizedBitmap(Bitmap bm, int newHeight, int newWidth) {
int width = bm.getWidth();
int height = bm.getHeight();
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
// create a matrix for the manipulation
Matrix matrix = new Matrix();
// resize the bitmap
matrix.postScale(scaleWidth, scaleHeight);
// "recreate" the new bitmap
Bitmap resizedBitmap = Bitmap.createBitmap(bm, 0, 0, width, height,
matrix, false);
return resizedBitmap;
}
/**
* Decode a bitmap for avoiding out of memory issue
* @param res
* @param resId
* @param reqWidth
* @param reqHeight
* @return
*/
public static Bitmap decodeSampledBitmapFromResource(Resources res,
int resId, int reqWidth, int reqHeight) {
// First decode with inJustDecodeBounds=true to check dimensions
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeResource(res, resId, options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, reqWidth,
reqHeight);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
return BitmapFactory.decodeResource(res, resId, options);
}
public static int calculateInSampleSize(BitmapFactory.Options options,
int reqWidth, int reqHeight) {
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
// Calculate ratios of height and width to requested height and
// width
final int heightRatio = Math.round((float) height
/ (float) reqHeight);
final int widthRatio = Math.round((float) width / (float) reqWidth);
// Choose the smallest ratio as inSampleSize value, this will
// guarantee
// a final image with both dimensions larger than or equal to the
// requested height and width.
inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
}
return inSampleSize;
}