当我有很多结果回来时（最多大约 30 个），我就会出现内存不足的问题。实际错误是：
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)
图像缩小的方式是：
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);
}
图像来自数据库，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，就像：
String picturePath = dbRow.imagePath();
if (picturePath.equals("notset")) {
holder.ivPicture.setImageResource(R.drawable.photonotset);
} else {
holder.ivPicture.setImageBitmap(dbRow.image());
}
编辑：继承人请求的例程：
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;
}