我正在模拟器中测试我的应用程序。 仿真器设备尺寸 - 480 x 854 图像大小 - 1280 x 720 样本大小= 1（这是来自Android参考中解释的过程 - http://developer.android.com/training/displaying-bitmaps/load-bitmap.html）
当我触发此活动时，应用程序运行良好，当我遍历到下一个活动并返回时，应用程序与OOM崩溃。我已经按照android手册中解释的过程有效地加载了位图，但是它仍然在行中失败了 backgoundImage = getAssetImage（getApplicationContext（），“backgroundhomepage”）; 请帮助。
问题1：此大小的设备的最小堆大小是多少？ 问题2：我是否需要更改样本量？ 问题3：我需要遵循的任何其他步骤？
/**************************************************************************************************************************************************************
1. To get the image from asset library
**************************************************************************************************************************************************************/
public Bitmap getAssetImage(Context context, String filename) throws IOException {
AssetManager assets = getApplicationContext().getResources().getAssets();
InputStream buffer = null;
try {
buffer = new BufferedInputStream((assets.open("drawable/" + filename + ".png")));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
BitmapFactory.Options options = new BitmapFactory.Options();
options.inPurgeable = true;
Log.i("DragDrop", " 1280 x 800 " + calculateInSampleSize(options, 1280, 800) );
Log.i("DragDrop", " 1024 x 600 " + calculateInSampleSize(options, 1024, 600) );
Log.i("DragDrop", " 480 x 800 " + calculateInSampleSize(options, 480, 800) );
Log.i("DragDrop", " 480 x 854 " + calculateInSampleSize(options, 480, 854) );
Log.i("DragDrop", " 1280 x 720 " + calculateInSampleSize(options, 1280, 720) );
Log.i("DragDrop", " 720 x 1280 " + calculateInSampleSize(options, 720, 1280) );
Log.i("DragDrop", " 240 x 432 " + calculateInSampleSize(options, 240, 432) );
Log.i("DragDrop", " 240 x 400 " + calculateInSampleSize(options, 240, 400) );
Log.i("DragDrop", " 320 x 480 " + calculateInSampleSize(options, 320, 480) );
Log.i("DragDrop", " 240 x 320 " + calculateInSampleSize(options, 240, 320) );
if (tabletSize) {
Log.i("DragDrop", "am tablet");
} else {
Log.i("DragDrop", "am phone");
Log.i("DragDrop", "------------------------------------------------------");
Log.i("DragDrop", "dWidth" + dWidth);
Log.i("DragDrop", "dHeight" + dHeight);
int tempSampleSize = calculateInSampleSize(options, (int)dWidth, (int)dHeight);
Log.i("DragDrop", "sample size" + tempSampleSize + "so options left aside" );
if (tempSampleSize > 1) {
Log.i("DragDrop", "sample size > 1" + "so options is set to the sample size " + tempSampleSize );
options.inSampleSize = tempSampleSize;
}
//options.inSampleSize = 2;
}
Bitmap temp = BitmapFactory.decodeStream(buffer, null, options);
Bitmap finalImage = Bitmap.createScaledBitmap(temp, (int) dWidth, (int) dHeight, true);
//temp.recycle();
// temp=null;
return finalImage;
}
public int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
// Raw height and width of image
final int height = 720;
final int width = 1280;
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;
}
07-07 21:16:17.960: I/DragDrop(694): 1280 800 1
07-07 21:16:17.960: I/DragDrop(694): 1024 600 1
07-07 21:16:17.970: I/DragDrop(694): 480 800 1
07-07 21:16:18.001: I/DragDrop(694): 480 854 1
07-07 21:16:18.001: I/DragDrop(694): 1280 720 1
07-07 21:16:18.001: I/DragDrop(694): 720 1280 1
07-07 21:16:18.040: I/DragDrop(694): 240 432 2
07-07 21:16:18.040: I/DragDrop(694): 240 400 2
07-07 21:16:18.040: I/DragDrop(694): 320 480 2
07-07 21:16:18.060: I/DragDrop(694): 240 320 2
07-07 21:16:18.122: I/DragDrop(694): am phone
07-07 21:16:18.122: I/DragDrop(694): ------------------------------------------------------
07-07 21:16:18.130: I/DragDrop(694): dWidth854.0
07-07 21:16:18.170: I/DragDrop(694): dHeight480.0
07-07 21:16:18.170: I/DragDrop(694): sample size1so options left aside
07-07 21:16:19.080: D/dalvikvm(694): GC_FOR_ALLOC freed 3K, 38% free 9526K/15175K, paused 516ms, total 534ms
07-07 21:16:19.250: I/dalvikvm-heap(694): Grow heap (frag case) to 12.866MB for 3686416-byte allocation
07-07 21:16:19.540: D/dalvikvm(694): GC_FOR_ALLOC freed <1K, 14% free 13126K/15175K, paused 280ms, total 280ms
07-07 21:16:19.990: I/Choreographer(694): Skipped 41 frames! The application may be doing too much work on its main thread.
07-07 21:16:20.370: D/dalvikvm(694): GC_CONCURRENT freed <1K, 14% free 13127K/15175K, paused 114ms+120ms, total 830ms
07-07 21:16:21.150: I/Choreographer(694): Skipped 42 frames! The application may be doing too much work on its main thread.
07-07 21:16:21.980: D/dalvikvm(694): GC_FOR_ALLOC freed 17K, 14% free 13112K/15175K, paused 647ms, total 647ms
07-07 21:16:21.980: I/dalvikvm-heap(694): Forcing collection of SoftReferences for 1639696-byte allocation
07-07 21:16:22.250: I/mybringback(694): In Pause of mybringback
07-07 21:16:22.250: D/dalvikvm(694): GC_BEFORE_OOM freed 0K, 14% free 13112K/15175K, paused 262ms, total 262ms
07-07 21:16:22.263: E/dalvikvm-heap(694): Out of memory on a 1639696-byte allocation.
07-07 21:16:22.270: I/dalvikvm(694): "Thread-82" prio=5 tid=14 RUNNABLE
07-07 21:16:22.312: I/dalvikvm(694): | group="main" sCount=0 dsCount=0 obj=041354480 self=02a1b35c8
07-07 21:16:22.312: I/dalvikvm(694): | sysTid=850 nice=0 sched=0/0 cgrp=apps handle=706426136
07-07 21:16:22.320: I/dalvikvm(694): | schedstat=( 768726126 3420053317 119 ) utm=62 stm=14 core=0
07-07 21:16:22.320: I/dalvikvm(694): at android.graphics.Bitmap.nativeCreate(Native Method)
07-07 21:16:22.320: I/dalvikvm(694): at android.graphics.Bitmap.createBitmap(Bitmap.java:640)
07-07 21:16:22.330: I/dalvikvm(694): at android.graphics.Bitmap.createBitmap(Bitmap.java:586)
07-07 21:16:22.340: I/dalvikvm(694): at android.graphics.Bitmap.createScaledBitmap(Bitmap.java:466)
07-07 21:16:22.340: I/dalvikvm(694): at com.eample.funandlearn.DragDrop$MyBringBackSurface.getAssetImage(DragDrop.java:551)
07-07 21:16:22.340: I/dalvikvm(694): at com.eample.funandlearn.DragDrop$MyBringBackSurface.run(DragDrop.java:633)
07-07 21:16:22.350: I/dalvikvm(694): at java.lang.Thread.run(Thread.java:856)
07-07 21:16:22.400: W/dalvikvm(694): threadid=14: thread eiting with uncaught eception (group=0
07-07 21:16:22.480: E/AndroidRuntime(694): FATAL EXCEPTION: Thread-82
07-07 21:16:22.480: E/AndroidRuntime(694): java.lang.OutOfMemoryError
07-07 21:16:22.480: E/AndroidRuntime(694): at android.graphics.Bitmap.nativeCreate(Native Method)
07-07 21:16:22.480: E/AndroidRuntime(694): at android.graphics.Bitmap.createBitmap(Bitmap.java:640)
07-07 21:16:22.480: E/AndroidRuntime(694): at android.graphics.Bitmap.createBitmap(Bitmap.java:586)
07-07 21:16:22.480: E/AndroidRuntime(694): at android.graphics.Bitmap.createScaledBitmap(Bitmap.java:466)
07-07 21:16:22.480: E/AndroidRuntime(694): at com.eample.funandlearn.DragDrop$MyBringBackSurface.getAssetImage(DragDrop.java:551)
07-07 21:16:22.480: E/AndroidRuntime(694): at com.eample.funandlearn.DragDrop$MyBringBackSurface.run(DragDrop.java:633)
07-07 21:16:22.480: E/AndroidRuntime(694): at java.lang.Thread.run(Thread.java:856)
07-07 21:16:30.820: I/Process(694): Sending signal. PID: 694 SIG: 9
答案 0 :(得分：0)
您可以像这样获得堆大小
Runtime rt = Runtime.getRuntime();
long maxMemory = rt.maxMemory();
Log.v("onCreate", "maxMemory:" + Long.toString(maxMemory));
来源：Detect application heap size in Android 对于其他问题，我不会帮助你。遗憾。
答案 1 :(得分：0)
我正在使用这个简单的代码从图库应用程序获取任何图像，确保图像方向正确。
BitmapFactory.Options bmpFactoryOptions = new BitmapFactory.Options();
bmpFactoryOptions.inJustDecodeBounds = true;
bmpFactoryOptions.inPreferredConfig = Bitmap.Config.ARGB_8888;
try {
bmp = BitmapFactory
.decodeStream(
getContentResolver().openInputStream(
imageFileUri), null, bmpFactoryOptions);
bmpFactoryOptions.inSampleSize = 4;
System.out.println("The Quality is" + quality);
bmpFactoryOptions.inJustDecodeBounds = false;
bmp = BitmapFactory
.decodeStream(
getContentResolver().openInputStream(
imageFileUri), null, bmpFactoryOptions);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
String[] orientationColumn = { MediaStore.Images.Media.ORIENTATION };
@SuppressWarnings("deprecation")
Cursor cur = managedQuery(imageFileUri, orientationColumn, null,
null, null);
int orientation = -1;
if (cur != null && cur.moveToFirst()) {
orientation = cur.getInt(cur
.getColumnIndex(orientationColumn[0]));
}
Matrix matrix = new Matrix();
matrix.postRotate(orientation);
bmp = Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(),
bmp.getHeight(), matrix, true);
view.setImageBitmap(bmp);
欢迎您使用它。