Java 内存不足问题
当我有相当多的结果回来时(大约30个),我的内存问题就出来了。实际误差为:Java 内存不足问题,java,android,memory-management,Java,Android,Memory Management,当我有相当多的结果回来时(大约30个),我的内存问题就出来了。实际误差为: 08-20 10:55:19.820: E/dalvikvm-heap(13483): Out of memory on a 499408-byte allocation. 08-20 10:55:19.835: E/AndroidRuntime(13483): FATAL EXCEPTION: main 08-20 10:55:19.835: E/AndroidRuntime(13483): java.lang.Out
08-20 10:55:19.820: E/dalvikvm-heap(13483): Out of memory on a 499408-byte allocation.
08-20 10:55:19.835: E/AndroidRuntime(13483): FATAL EXCEPTION: main
08-20 10:55:19.835: E/AndroidRuntime(13483): java.lang.OutOfMemoryError
08-20 10:55:19.835: E/AndroidRuntime(13483): at android.graphics.BitmapFactory.nativeDecodeStream(Native Method)
08-20 10:55:19.835: E/AndroidRuntime(13483): at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:650)
08-20 10:55:19.835: E/AndroidRuntime(13483): at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:389)
08-20 10:55:19.835: E/AndroidRuntime(13483): at com.directenquiries.assessment.tool.Globals.Functions.decodeSampledBitmapFromFile(Functions.java:94)
08-20 10:55:19.835: E/AndroidRuntime(13483): at com.directenquiries.assessment.tool.db.assets.AssetRow.image(AssetRow.java:119)
08-20 10:55:19.835: E/AndroidRuntime(13483): at com.directenquiries.assessment.tool.ViewAssetsList.loadTable(ViewAssetsList.java:75)
08-20 10:55:19.835: E/AndroidRuntime(13483): at com.directenquiries.assessment.tool.ViewAssetsList.onResume(ViewAssetsList.java:60)
08-20 10:55:19.835: E/AndroidRuntime(13483): at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1188)
08-20 10:55:19.835: E/AndroidRuntime(13483): at android.app.Activity.performResume(Activity.java:5280)
08-20 10:55:19.835: E/AndroidRuntime(13483): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2606)
08-20 10:55:19.835: E/AndroidRuntime(13483): at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2644)
08-20 10:55:19.835: E/AndroidRuntime(13483): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1269)
08-20 10:55:19.835: E/AndroidRuntime(13483): at android.os.Handler.dispatchMessage(Handler.java:99)
08-20 10:55:19.835: E/AndroidRuntime(13483): at android.os.Looper.loop(Looper.java:137)
08-20 10:55:19.835: E/AndroidRuntime(13483): at android.app.ActivityThread.main(ActivityThread.java:4898)
08-20 10:55:19.835: E/AndroidRuntime(13483): at java.lang.reflect.Method.invokeNative(Native Method)
08-20 10:55:19.835: E/AndroidRuntime(13483): at java.lang.reflect.Method.invoke(Method.java:511)
08-20 10:55:19.835: E/AndroidRuntime(13483): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006)
08-20 10:55:19.835: E/AndroidRuntime(13483): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
08-20 10:55:19.835: E/AndroidRuntime(13483): at dalvik.system.NativeStart.main(Native Method)
缩小图像的方式是:
public static Bitmap decodeSampledBitmapFromFile(String imagePath, int reqWidth, int reqHeight) {
// First decode with inJustDecodeBounds=true to check dimensions
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(imagePath, options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
return BitmapFactory.decodeFile(imagePath, options);
}
图像来自DB,设置如下:
@Override
public String imagePath() {
if (firstissuePhoto == null) {
firstissuePhoto = StationPhotoDB.getFirstPhotoWithStationObjectID(this.stationObjectID);
if(!firstissuePhoto.endsWith("jpg")){
firstissuePhoto = "notset";
}
}
return firstissuePhoto;
}
@Override
public Bitmap image() {
if (firstissuePhotoThumb == null) {
firstissuePhotoThumb = Functions.decodeSampledBitmapFromFile(imagePath(),200, 200);
}
return firstissuePhotoThumb;
}
然后,当我实际使用图像并设置它时,它就像:
String picturePath = dbRow.imagePath();
if (picturePath.equals("notset")) {
holder.ivPicture.setImageResource(R.drawable.photonotset);
} else {
holder.ivPicture.setImageBitmap(dbRow.image());
}
编辑:这是请求的例程:
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) {
if (width > height) {
inSampleSize = Math.round((float)height / (float)reqHeight);
} else {
inSampleSize = Math.round((float)width / (float)reqWidth);
}
}
return inSampleSize;
}
您需要回收未使用的位图。有一个recycle()api。使用它代码看起来正确,并遵循Android处理大型位图文件的最佳实践 查看堆栈跟踪,内存不足发生在
BitmapFactory.nativeDecodeseam
中。对于JPEG图像,应用程序必须解码(解压缩)图像数据。这种解压缩可能需要在缩放图像之前将其解压缩到内存中。如果图像较大(例如照片),则很容易需要大量内存
由于JPEG图像的块大小可能为8或16,因此您可能需要尝试强制采样大小为8的倍数。这可能有助于图像缩放逻辑不使用太多的内存来解码JPEG
此外,记录
宽度
、高度
和采样
值应该很有用。当内存中包含太多位图对象时,可能会出现后计算不简单的内存错误。.我已经添加了calucluteinsamplesize,谢谢您能再详细说明一下吗?我应该在什么阶段进行回收?recycle
是在位图对象上调用的,当您不再需要它时。因此,您需要将位图与holder关联,然后在(holder.image!=null)holder.image.recycle()时执行代码>设置图像之前。这只会确保图像被垃圾收集,并且不会真正帮助OOM,除非您正在创建大量位图。添加Log
跟踪应有助于实现这一点。请参阅。您也可以参考此链接,希望对您有所帮助