sng*_*eco 11 heap android bitmap out-of-memory imageview
我目前正在开发一个讲述故事的应用程序.故事包含"场景",其中包含通过ImageViews显示的多个JPEG和PNG文件.我创建了ImageView并通过以下函数将其添加到布局中:
private ImageView newImage(Show show)
{
ImageView iv = new ImageView(this);
String filePath = comin.generateFilePath(show);
Log.i(TAG, "newImage, filePath = " + filePath + " id = " + show.id);
WeakReference<Bitmap> bmp = new WeakReference<Bitmap>(scaleBitmap(filePath)); //added 4/1/13
//Bitmap bmp = scaleBitmap(filePath);
Log.i(TAG, "newImage, width = " + bmp.get().getWidth() + ", height = " + bmp.get().getHeight());
iv.setImageBitmap(bmp.get());
iv.setScaleType(ImageView.ScaleType.FIT_XY);
iv.setId(show.id);
//set visibility
if (show.visible)
iv.setVisibility(View.VISIBLE);
else
iv.setVisibility(View.INVISIBLE);
//set dimensions
int width = (app.getWidth() * show.dimX) / 100;
int height = (app.getHeight() * show.dimY) / 100;
RelativeLayout.LayoutParams rlp = new RelativeLayout.LayoutParams(width, height);
iv.setLayoutParams(rlp);
return iv;
}
一旦场景结束,我就会清除所有的ImageView,除了没有图像的图像,只能用于监听触摸事件.
private void clearScene(boolean clearTouch)
{
RelativeLayout parent = (RelativeLayout) findViewById(R.id.relative_layout);
logMemory("clearScene, START");
int count = parent.getChildCount();
for (int a = count - 1; a >= 0; a--)
{
int id = parent.getChildAt(a).getId();
String message = "clearScene id = " + id + ", count = " + count + ", a = " + a;
if (id == TOUCH_VIEW_ID && !clearTouch)
{
message = message + ", ignore touch screen view";
}
else
{
unbindView(parent.getChildAt(a));
parent.getChildAt(a).clearAnimation();
parent.removeView(parent.getChildAt(a));
message = message + ", unbindView, clearAnimation, removeView";
}
Log.i(TAG, message);
logMemory("clearScene, CLEARED VIEW");
}
handler.removeCallbacksAndMessages(null); //stop any future scheduled tasks from triggering
logMemory("clearScene, BEFORE TRASH COLLECTOR");
System.gc();
logMemory("clearScene, AFTER TRASH COLLECTOR");
}
如您所见,我调用unbindView()方法,尝试清除任何类型的可能内存泄漏.
private void unbindView(View view)
{
String message = "unbindView, id = " + view.getId();
try {view.setOnClickListener(null);} catch (Throwable mayHappen) {};
try {view.setOnCreateContextMenuListener(null);} catch (Throwable mayHappen) {};
try {view.setOnFocusChangeListener(null);} catch (Throwable mayHappen) {};
try {view.setOnKeyListener(null);} catch (Throwable mayHappen) {};
try {view.setOnLongClickListener(null);} catch (Throwable mayHappen) {};
try {view.setOnClickListener(null);} catch (Throwable mayHappen) {};
if (view.getBackground() != null)
{
message = message + ", setBackgroundCallback(null)";
view.getBackground().setCallback(null);
}
if (view instanceof ImageView)
{
if (((ImageView)view).getDrawable() != null)
{
if (((ImageView)view).getDrawable() instanceof BitmapDrawable)
{
message = message + ", recycle bitmap";
((BitmapDrawable)((ImageView)view).getDrawable()).getBitmap().recycle();
}
message = message + ", setDrawableCallback(null)";
((ImageView)view).getDrawable().setCallback(null);
}
message = message + ", setImageBitmap(null), setBackgroundDrawable(null)";
((ImageView) view).setImageBitmap(null);
((ImageView) view).setBackgroundDrawable(null);
}
Log.i(TAG, message);
}
一旦所有的ImageView都无限制,我就会在clearScene函数中运行垃圾收集器.
***编辑(4/2/13)好的,经过一些研究和反复试验,我改变了我的记忆记录.以下是相关方法:
In onResume(), I set a Boolean to true depending on the version of Android (to determine if it uses native or Java memory for Bitmaps), and then I initialize default value of 0 for the old memory values;
@Override
protected void onResume()
{
super.onResume();
if (android.os.Build.VERSION.SDK_INT >= 11) debugJavaMemory = true;
else debugNativeMemory = true;
availableJavaMemoryOld = 0;
availableNativeMemoryOld = 0;
dialogDebug();
}
This is my logging function. It logs depending on whether the current version of Android is using native or Java memory to store Bitmaps.
private void logMemory(String callingFunction)
{
if (debugJavaMemory)
{
long max = Runtime.getRuntime().maxMemory() / 1024;
long used = Runtime.getRuntime().totalMemory() / 1024;
long available = max - used;
long change = available - availableJavaMemoryOld;
if (availableJavaMemoryOld != 0)
Log.i(TAG_MEMORY, "jMEM M:" + max + ", U:" + used + ", A:" + available + ", C:" + change + ", " + callingFunction);
availableJavaMemoryOld = available;
}
else if (debugNativeMemory)
{
long max = Debug.getNativeHeapSize() / 1024;
long used = Debug.getNativeHeapAllocatedSize() / 1024;
long available = max - used;
long change = available - availableNativeMemoryOld;
if (availableNativeMemoryOld != 0)
Log.i(TAG_MEMORY, "nMEM M:" + max + ", U:" + used + ", A:" + available + ", C:" + change + ", " + callingFunction);
availableNativeMemoryOld = available;
}
}
If you look at my log I collect from an emulator running Android 10 (2.3.3), the garbage collector appears to be working perfectly! The only thing I noticed that was odd, was that the Max Native Memory could increase dynamically!?
Legend: M: (max memory), U: (used memory), A: (available memory), C: (change in available memory), Function that called log function
04-03 02:34:20.758: I/MEMORY(1045): nMEM M:18336, U:13287, A:5049, C:-2549, loadScene, ADDED IMAGE b:0, s:0, id:0
04-03 02:34:21.267: I/MEMORY(1045): nMEM M:21568, U:21391, A:177, C:-4872, loadScene, ADDED IMAGE b:0, s:0, id:1
04-03 02:34:35.227: I/MEMORY(1045): nMEM M:21568, U:13288, A:8280, C:8103, clearScene, CLEARED VIEW id:1
04-03 02:34:35.267: I/MEMORY(1045): nMEM M:21568, U:5184, A:16384, C:8104, clearScene, CLEARED VIEW id:0
04-03 02:34:35.327: I/MEMORY(1045): nMEM M:21568, U:4977, A:16591, C:207, clearScene, AFTER TRASH COLLECTOR
04-03 02:34:36.067: I/MEMORY(1045): nMEM M:21568, U:13082, A:8486, C:-8105, loadScene, ADDED IMAGE b:1, s:0, id:0
04-03 02:34:47.177: I/MEMORY(1045): nMEM M:21568, U:4979, A:16589, C:8103, clearScene, CLEARED VIEW id:0
04-03 02:34:47.277: I/MEMORY(1045): nMEM M:21568, U:4978, A:16590, C:1, clearScene, AFTER TRASH COLLECTOR
04-03 02:34:47.997: I/MEMORY(1045): nMEM M:21568, U:13082, A:8486, C:-8104, loadScene, ADDED IMAGE b:1, s:1, id:0
04-03 02:34:49.307: I/MEMORY(1045): nMEM M:26224, U:21186, A:5038, C:-3448, loadScene, ADDED IMAGE b:1, s:1, id:1
04-03 02:34:50.597: I/MEMORY(1045): nMEM M:34328, U:29290, A:5038, C:0, loadScene, ADDED IMAGE b:1, s:1, id:2
04-03 02:34:51.839: I/MEMORY(1045): nMEM M:42432, U:37395, A:5037, C:-1, loadScene, ADDED IMAGE b:1, s:1, id:3
04-03 02:35:00.377: I/MEMORY(1045): nMEM M:42432, U:29293, A:13139, C:8102, clearScene, CLEARED VIEW id:3
04-03 02:35:00.387: I/MEMORY(1045): nMEM M:42432, U:21189, A:21243, C:8104, clearScene, CLEARED VIEW id:2
04-03 02:35:00.397: I/MEMORY(1045): nMEM M:42432, U:13085, A:29347, C:8104, clearScene, CLEARED VIEW id:1
04-03 02:35:00.407: I/MEMORY(1045): nMEM M:42432, U:4982, A:37450, C:8103, clearScene, CLEARED VIEW id:0
04-03 02:35:00.449: I/MEMORY(1045): nMEM M:42432, U:4978, A:37454, C:4, clearScene, AFTER TRASH COLLECTOR
04-03 02:35:01.217: I/MEMORY(1045): nMEM M:42432, U:13083, A:29349, C:-8105, loadScene, ADDED IMAGE b:1, s:2, id:0
04-03 02:35:23.458: I/MEMORY(1045): nMEM M:42432, U:4979, A:37453, C:8104, clearScene, CLEARED VIEW id:0
04-03 02:35:23.508: I/MEMORY(1045): nMEM M:42432, U:4978, A:37454, C:1, clearScene, AFTER TRASH COLLECTOR
04-03 02:35:24.777: I/MEMORY(1045): nMEM M:42432, U:13082, A:29350, C:-8104, loadScene, ADDED IMAGE b:1, s:3, id:0
04-03 02:35:25.719: I/MEMORY(1045): nMEM M:42432, U:21186, A:21246, C:-8104, loadScene, ADDED IMAGE b:1, s:3, id:1
04-03 02:35:26.457: I/MEMORY(1045): nMEM M:42432, U:29291, A:13141, C:-8105, loadScene, ADDED IMAGE b:1, s:3, id:2
04-03 02:35:55.008: I/MEMORY(1045): nMEM M:42432, U:21187, A:21245, C:8104, clearScene, CLEARED VIEW id:2
04-03 02:35:55.027: I/MEMORY(1045): nMEM M:42432, U:13083, A:29349, C:8104, clearScene, CLEARED VIEW id:1
04-03 02:35:55.037: I/MEMORY(1045): nMEM M:42432, U:4979, A:37453, C:8104, clearScene, CLEARED VIEW id:0
04-03 02:35:55.077: I/MEMORY(1045): nMEM M:42432, U:4978, A:37454, C:1, clearScene, AFTER TRASH COLLECTOR
04-03 02:35:55.829: I/MEMORY(1045): nMEM M:42432, U:13083, A:29349, C:-8105, loadScene, ADDED IMAGE b:1, s:4, id:0
04-03 02:35:56.427: I/MEMORY(1045): nMEM M:42432, U:21187, A:21245, C:-8104, loadScene, ADDED IMAGE b:1, s:4, id:1
04-03 02:36:00.257: I/MEMORY(1045): nMEM M:42432, U:13083, A:29349, C:8104, clearScene, CLEARED VIEW id:1
04-03 02:36:00.278: I/MEMORY(1045): nMEM M:42432, U:4979, A:37453, C:8104, clearScene, CLEARED VIEW id:0
04-03 02:36:00.318: I/MEMORY(1045): nMEM M:42432, U:4978, A:37454, C:1, clearScene, AFTER TRASH COLLECTOR
04-03 02:36:01.687: I/MEMORY(1045): nMEM M:42432, U:13083, A:29349, C:-8105, loadScene, ADDED IMAGE b:1, s:5, id:0
04-03 02:36:06.437: I/MEMORY(1045): nMEM M:42432, U:4979, A:37453, C:8104, clearScene, CLEARED VIEW id:0
04-03 02:36:06.487: I/MEMORY(1045): nMEM M:42432, U:4978, A:37454, C:1, clearScene, AFTER TRASH COLLECTOR
04-03 02:36:07.777: I/MEMORY(1045): nMEM M:42432, U:13082, A:29350, C:-8104, loadScene, ADDED IMAGE b:1, s:6, id:0
04-03 02:36:09.297: I/MEMORY(1045): nMEM M:42432, U:4978, A:37454, C:8104, clearScene, CLEARED VIEW id:0
04-03 02:36:09.337: I/MEMORY(1045): nMEM M:42432, U:4978, A:37454, C:0, clearScene, AFTER TRASH COLLECTOR
04-03 02:36:10.727: I/MEMORY(1045): nMEM M:42432, U:13082, A:29350, C:-8104, loadScene, ADDED IMAGE b:1, s:7, id:0
04-03 02:36:20.947: I/MEMORY(1045): nMEM M:42432, U:4978, A:37454, C:8104, clearScene, CLEARED VIEW id:0
04-03 02:36:20.987: I/MEMORY(1045): nMEM M:42432, U:4978, A:37454, C:0, clearScene, AFTER TRASH COLLECTOR
04-03 02:36:22.367: I/MEMORY(1045): nMEM M:42432, U:13082, A:29350, C:-8104, loadScene, ADDED IMAGE b:1, s:8, id:0
04-03 02:36:23.317: I/MEMORY(1045): nMEM M:42432, U:21187, A:21245, C:-8105, loadScene, ADDED IMAGE b:1, s:8, id:1
04-03 02:36:23.887: I/MEMORY(1045): nMEM M:42432, U:29291, A:13141, C:-8104, loadScene, ADDED IMAGE b:1, s:8, id:2
04-03 02:36:26.507: I/MEMORY(1045): nMEM M:42432, U:21187, A:21245, C:8104, clearScene, CLEARED VIEW id:2
04-03 02:36:26.517: I/MEMORY(1045): nMEM M:42432, U:13083, A:29349, C:8104, clearScene, CLEARED VIEW id:1
04-03 02:36:26.527: I/MEMORY(1045): nMEM M:42432, U:4979, A:37453, C:8104, clearScene, CLEARED VIEW id:0
04-03 02:36:26.577: I/MEMORY(1045): nMEM M:42432, U:4978, A:37454, C:1, clearScene, AFTER TRASH COLLECTOR
04-03 02:36:27.797: I/MEMORY(1045): nMEM M:42432, U:13083, A:29349, C:-8105, loadScene, ADDED IMAGE b:1, s:9, id:0
04-03 02:36:29.248: I/MEMORY(1045): nMEM M:42432, U:4979, A:37453, C:8104, clearScene, CLEARED VIEW id:0
04-03 02:36:29.287: I/MEMORY(1045): nMEM M:42432, U:4978, A:37454, C:1, clearScene, AFTER TRASH COLLECTOR
04-03 02:36:30.547: I/MEMORY(1045): nMEM M:42432, U:13082, A:29350, C:-8104, loadScene, ADDED IMAGE b:1, s:10, id:0
04-03 02:36:32.177: I/MEMORY(1045): nMEM M:42432, U:4978, A:37454, C:8104, clearScene, CLEARED VIEW id:0
04-03 02:36:32.228: I/MEMORY(1045): nMEM M:42432, U:4978, A:37454, C:0, clearScene, AFTER TRASH COLLECTOR
04-03 02:36:33.467: I/MEMORY(1045): nMEM M:42432, U:13082, A:29350, C:-8104, loadScene, ADDED IMAGE b:1, s:11, id:0
04-03 02:36:33.977: I/MEMORY(1045): nMEM M:42432, U:21187, A:21245, C:-8105, loadScene, ADDED IMAGE b:1, s:11, id:1
04-03 02:36:34.527: I/MEMORY(1045): nMEM M:42432, U:29291, A:13141, C:-8104, loadScene, ADDED IMAGE b:1, s:11, id:2
04-03 02:36:35.058: I/MEMORY(1045): nMEM M:42432, U:37395, A:5037, C:-8104, loadScene, ADDED IMAGE b:1, s:11, id:3
04-03 02:36:41.260: I/MEMORY(1045): nMEM M:42432, U:29291, A:13141, C:8104, clearScene, CLEARED VIEW id:3
04-03 02:36:41.267: I/MEMORY(1045): nMEM M:42432, U:21187, A:21245, C:8104, clearScene, CLEARED VIEW id:2
04-03 02:36:41.278: I/MEMORY(1045): nMEM M:42432, U:13083, A:29349, C:8104, clearScene, CLEARED VIEW id:1
04-03 02:36:41.287: I/MEMORY(1045): nMEM M:42432, U:4979, A:37453, C:8104, clearScene, CLEARED VIEW id:0
04-03 02:36:41.337: I/MEMORY(1045): nMEM M:42432, U:4979, A:37453, C:0, clearScene, AFTER TRASH COLLECTOR
04-03 02:36:42.618: I/MEMORY(1045): nMEM M:42432, U:13083, A:29349, C:-8104, loadScene, ADDED IMAGE b:2, s:0, id:0
04-03 02:37:00.550: I/MEMORY(1045): nMEM M:42432, U:4979, A:37453, C:8104, clearScene, CLEARED VIEW id:0
04-03 02:37:00.587: I/MEMORY(1045): nMEM M:42432, U:4979, A:37453, C:0, clearScene, AFTER TRASH COLLECTOR
04-03 02:37:01.817: I/MEMORY(1045): nMEM M:42432, U:13083, A:29349, C:-8104, loadScene, ADDED IMAGE b:2, s:1, id:0
04-03 02:37:03.347: I/MEMORY(1045): nMEM M:42432, U:4979, A:37453, C:8104, clearScene, CLEARED VIEW id:0
04-03 02:37:03.397: I/MEMORY(1045): nMEM M:42432, U:4979, A:37453, C:0, clearScene, AFTER TRASH COLLECTOR
04-03 02:37:04.607: I/MEMORY(1045): nMEM M:42432, U:13083, A:29349, C:-8104, loadScene, ADDED IMAGE b:2, s:2, id:0
04-03 02:37:05.258: I/MEMORY(1045): nMEM M:42432, U:21187, A:21245, C:-8104, loadScene, ADDED IMAGE b:2, s:2, id:1
04-03 02:37:07.677: I/MEMORY(1045): nMEM M:42432, U:13083, A:29349, C:8104, clearScene, CLEARED VIEW id:1
04-03 02:37:07.687: I/MEMORY(1045): nMEM M:42432, U:4979, A:37453, C:8104, clearScene, CLEARED VIEW id:0
04-03 02:37:07.737: I/MEMORY(1045): nMEM M:42432, U:4979, A:37453, C:0, clearScene, AFTER TRASH COLLECTOR
04-03 02:37:09.017: I/MEMORY(1045): nMEM M:42432, U:13083, A:29349, C:-8104, loadScene, ADDED IMAGE b:2, s:3, id:0
04-03 02:37:10.327: I/MEMORY(1045): nMEM M:42432, U:21187, A:21245, C:-8104, loadScene, ADDED IMAGE b:2, s:3, id:1
04-03 02:37:13.330: I/MEMORY(1045): nMEM M:42432, U:13083, A:29349, C:8104, clearScene, CLEARED VIEW id:1
04-03 02:37:13.337: I/MEMORY(1045): nMEM M:42432, U:4979, A:37453, C:8104, clearScene, CLEARED VIEW id:0
04-03 02:37:13.387: I/MEMORY(1045): nMEM M:42432, U:4979, A:37453, C:0, clearScene, AFTER TRASH COLLECTOR
04-03 02:37:14.697: I/MEMORY(1045): nMEM M:42432, U:13083, A:29349, C:-8104, loadScene, ADDED IMAGE b:2, s:4, id:0
04-03 02:37:16.037: I/MEMORY(1045): nMEM M:42432, U:21187, A:21245, C:-8104, loadScene, ADDED IMAGE b:2, s:4, id:1
04-03 02:37:17.367: I/MEMORY(1045): nMEM M:42432, U:29292, A:13140, C:-8105, loadScene, ADDED IMAGE b:2, s:4, id:2
04-03 02:37:19.087: I/MEMORY(1045): nMEM M:42432, U:37396, A:5036, C:-8104, loadScene, ADDED IMAGE b:2, s:4, id:3
04-03 02:37:44.347: I/MEMORY(1045): nMEM M:42432, U:29293, A:13139, C:8103, clearScene, CLEARED VIEW id:3
04-03 02:37:44.357: I/MEMORY(1045): nMEM M:42432, U:21189, A:21243, C:8104, clearScene, CLEARED VIEW id:2
04-03 02:37:44.367: I/MEMORY(1045): nMEM M:42432, U:13085, A:29347, C:8104, clearScene, CLEARED VIEW id:1
04-03 02:37:44.377: I/MEMORY(1045): nMEM M:42432, U:4981, A:37451, C:8104, clearScene, CLEARED VIEW id:0
04-03 02:37:44.437: I/MEMORY(1045): nMEM M:42432, U:4979, A:37453, C:2, clearScene, AFTER TRASH COLLECTOR
04-03 02:37:45.667: I/MEMORY(1045): nMEM M:42432, U:13083, A:29349, C:-8104, loadScene, ADDED IMAGE b:2, s:5, id:0
04-03 02:37:46.917: I/MEMORY(1045): nMEM M:42432, U:21188, A:21244, C:-8105, loadScene, ADDED IMAGE b:2, s:5, id:1
04-03 02:37:48.167: I/MEMORY(1045): nMEM M:42432, U:29292, A:13140, C:-8104, loadScene, ADDED IMAGE b:2, s:5, id:2
04-03 02:37:49.807: I/MEMORY(1045): nMEM M:42432, U:37396, A:5036, C:-8104, loadScene, ADDED IMAGE b:2, s:5, id:3
04-03 02:38:08.239: I/MEMORY(1045): nMEM M:42432, U:29293, A:13139, C:8103, clearScene, CLEARED VIEW id:3
04-03 02:38:08.258: I/MEMORY(1045): nMEM M:42432, U:21189, A:21243, C:8104, clearScene, CLEARED VIEW id:2
04-03 02:38:08.267: I/MEMORY(1045): nMEM M:42432, U:13086, A:29346, C:8103, clearScene, CLEARED VIEW id:1
04-03 02:38:08.277: I/MEMORY(1045): nMEM M:42432, U:4982, A:37450, C:8104, clearScene, CLEARED VIEW id:0
04-03 02:38:08.317: I/MEMORY(1045): nMEM M:42432, U:4979, A:37453, C:3, clearScene, AFTER TRASH COLLECTOR
04-03 02:38:09.527: I/MEMORY(1045): nMEM M:42432, U:13083, A:29349, C:-8104, loadScene, ADDED IMAGE b:2, s:6, id:0
As mentioned, the memory is cleaned after the ImageView is unbound!
这是我从运行Android 17(4.2)的破坏的Nexus 7中收集的日志.很难理解这里如何使用内存.它永远不会一致!有时在加载ImageView时没有分配内存.有时我只在加载新的ImageView时清除内存.
图例:M :(最大内存),U :(已用内存),A :(可用内存),C :(可用内存更改),调用日志功能的函数
04-02 22:37:05.866: I/MEMORY(15827): jMEM M:65536, U:21300, A:44236, C:0, loadScene, ADDED IMAGE b:0, s:0, id:0
04-02 22:37:06.136: I/MEMORY(15827): jMEM M:65536, U:29444, A:36092, C:-8144, loadScene, ADDED IMAGE b:0, s:0, id:1
04-02 22:37:19.806: I/MEMORY(15827): jMEM M:65536, U:29432, A:36104, C:12, clearScene, CLEARED VIEW id:1
04-02 22:37:19.806: I/MEMORY(15827): jMEM M:65536, U:29432, A:36104, C:0, clearScene, CLEARED VIEW id:0
04-02 22:37:19.836: I/MEMORY(15827): jMEM M:65536, U:29432, A:36104, C:0, clearScene, AFTER TRASH COLLECTOR
04-02 22:37:20.116: I/MEMORY(15827): jMEM M:65536, U:37536, A:28000, C:-8104, loadScene, ADDED IMAGE b:1, s:0, id:0
04-02 22:37:28.456: I/MEMORY(15827): jMEM M:65536, U:37532, A:28004, C:4, clearScene, CLEARED VIEW id:0
04-02 22:37:28.486: I/MEMORY(15827): jMEM M:65536, U:37532, A:28004, C:0, clearScene, AFTER TRASH COLLECTOR
04-02 22:37:28.756: I/MEMORY(15827): jMEM M:65536, U:37532, A:28004, C:0, loadScene, ADDED IMAGE b:1, s:1, id:0
04-02 22:37:29.226: I/MEMORY(15827): jMEM M:65536, U:37532, A:28004, C:0, loadScene, ADDED IMAGE b:1, s:1, id:1
04-02 22:37:29.706: I/MEMORY(15827): jMEM M:65536, U:45636, A:19900, C:-8104, loadScene, ADDED IMAGE b:1, s:1, id:2
04-02 22:37:30.156: I/MEMORY(15827): jMEM M:65536, U:53740, A:11796, C:-8104, loadScene, ADDED IMAGE b:1, s:1, id:3
04-02 22:37:38.676: I/MEMORY(15827): jMEM M:65536, U:53732, A:11804, C:8, clearScene, CLEARED VIEW id:3
04-02 22:37:38.676: I/MEMORY(15827): jMEM M:65536, U:53732, A:11804, C:0, clearScene, CLEARED VIEW id:2
04-02 22:37:38.676: I/MEMORY(15827): jMEM M:65536, U:53732, A:11804, C:0, clearScene, CLEARED VIEW id:1
04-02 22:37:38.676: I/MEMORY(15827): jMEM M:65536, U:53732, A:11804, C:0, clearScene, CLEARED VIEW id:0
04-02 22:37:38.696: I/MEMORY(15827): jMEM M:65536, U:53732, A:11804, C:0, clearScene, AFTER TRASH COLLECTOR
04-02 22:37:38.966: I/MEMORY(15827): jMEM M:65536, U:53732, A:11804, C:0, loadScene, ADDED IMAGE b:1, s:2, id:0
04-02 22:37:48.156: I/MEMORY(15827): jMEM M:65536, U:53732, A:11804, C:0, clearScene, CLEARED VIEW id:0
04-02 22:37:48.216: I/MEMORY(15827): jMEM M:65536, U:37532, A:28004, C:16200, clearScene, AFTER TRASH COLLECTOR
04-02 22:37:48.676: I/MEMORY(15827): jMEM M:65536, U:37532, A:28004, C:0, loadScene, ADDED IMAGE b:1, s:3, id:0
04-02 22:37:49.256: I/MEMORY(15827): jMEM M:65536, U:37532, A:28004, C:0, loadScene, ADDED IMAGE b:1, s:3, id:1
04-02 22:37:49.716: I/MEMORY(15827): jMEM M:65536, U:45636, A:19900, C:-8104, loadScene, ADDED IMAGE b:1, s:3, id:2
04-02 22:38:07.426: I/MEMORY(15827): jMEM M:65536, U:45632, A:19904, C:4, clearScene, CLEARED VIEW id:2
04-02 22:38:07.426: I/MEMORY(15827): jMEM M:65536, U:45632, A:19904, C:0, clearScene, CLEARED VIEW id:1
04-02 22:38:07.426: I/MEMORY(15827): jMEM M:65536, U:45632, A:19904, C:0, clearScene, CLEARED VIEW id:0
04-02 22:38:07.496: I/MEMORY(15827): jMEM M:65536, U:45632, A:19904, C:0, clearScene, AFTER TRASH COLLECTOR
04-02 22:38:07.766: I/MEMORY(15827): jMEM M:65536, U:45632, A:19904, C:0, loadScene, ADDED IMAGE b:1, s:4, id:0
04-02 22:38:08.096: I/MEMORY(15827): jMEM M:65536, U:53736, A:11800, C:-8104, loadScene, ADDED IMAGE b:1, s:4, id:1
04-02 22:38:10.896: I/MEMORY(15827): jMEM M:65536, U:53736, A:11800, C:0, clearScene, CLEARED VIEW id:1
04-02 22:38:10.896: I/MEMORY(15827): jMEM M:65536, U:53736, A:11800, C:0, clearScene, CLEARED VIEW id:0
04-02 22:38:10.916: I/MEMORY(15827): jMEM M:65536, U:53736, A:11800, C:0, clearScene, AFTER TRASH COLLECTOR
04-02 22:38:11.436: I/MEMORY(15827): jMEM M:65536, U:53736, A:11800, C:0, loadScene, ADDED IMAGE b:1, s:5, id:0
04-02 22:38:19.356: I/MEMORY(15827): jMEM M:65536, U:53732, A:11804, C:4, clearScene, CLEARED VIEW id:0
04-02 22:38:19.386: I/MEMORY(15827): jMEM M:65536, U:45632, A:19904, C:8100, clearScene, AFTER TRASH COLLECTOR
04-02 22:38:19.866: I/MEMORY(15827): jMEM M:65536, U:45632, A:19904, C:0, loadScene, ADDED IMAGE b:1, s:6, id:0
04-02 22:38:21.326: I/MEMORY(15827): jMEM M:65536, U:45632, A:19904, C:0, clearScene, CLEARED VIEW id:0
04-02 22:38:21.356: I/MEMORY(15827): jMEM M:65536, U:21300, A:44236, C:24332, clearScene, AFTER TRASH COLLECTOR
04-02 22:38:21.906: I/MEMORY(15827): jMEM M:65536, U:29404, A:36132, C:-8104, loadScene, ADDED IMAGE b:1, s:7, id:0
04-02 22:38:24.376: I/MEMORY(15827): jMEM M:65536, U:29404, A:36132, C:0, clearScene, CLEARED VIEW id:0
04-02 22:38:24.406: I/MEMORY(15827): jMEM M:65536, U:29404, A:36132, C:0, clearScene, AFTER TRASH COLLECTOR
04-02 22:38:24.916: I/MEMORY(15827): jMEM M:65536, U:29404, A:36132, C:0, loadScene, ADDED IMAGE b:1, s:8, id:0
04-02 22:38:25.496: I/MEMORY(15827): jMEM M:65536, U:37548, A:27988, C:-8144, loadScene, ADDED IMAGE b:1, s:8, id:1
04-02 22:38:25.796: I/MEMORY(15827): jMEM M:65536, U:45652, A:19884, C:-8104, loadScene, ADDED IMAGE b:1, s:8, id:2
04-02 22:38:28.356: I/MEMORY(15827): jMEM M:65536, U:45652, A:19884, C:0, clearScene, CLEARED VIEW id:2
04-02 22:38:28.356: I/MEMORY(15827): jMEM M:65536, U:45652, A:19884, C:0, clearScene, CLEARED VIEW id:1
04-02 22:38:28.356: I/MEMORY(15827): jMEM M:65536, U:45652, A:19884, C:0, clearScene, CLEARED VIEW id:0
04-02 22:38:28.376: I/MEMORY(15827): jMEM M:65536, U:45652, A:19884, C:0, clearScene, AFTER TRASH COLLECTOR
04-02 22:38:28.846: I/MEMORY(15827): jMEM M:65536, U:45652, A:19884, C:0, loadScene, ADDED IMAGE b:1, s:9, id:0
04-02 22:38:29.926: I/MEMORY(15827): jMEM M:65536, U:45652, A:19884, C:0, clearScene, CLEARED VIEW id:0
04-02 22:38:29.956: I/MEMORY(15827): jMEM M:65536, U:29400, A:36136, C:16252, clearScene, AFTER TRASH COLLECTOR
04-02 22:38:30.416: I/MEMORY(15827): jMEM M:65536, U:29400, A:36136, C:0, loadScene, ADDED IMAGE b:1, s:10, id:0
04-02 22:38:31.446: I/MEMORY(15827): jMEM M:65536, U:29400, A:36136, C:0, clearScene, CLEARED VIEW id:0
04-02 22:38:31.476: I/MEMORY(15827): jMEM M:65536, U:21300, A:44236, C:8100, clearScene, AFTER TRASH COLLECTOR
04-02 22:38:31.966: I/MEMORY(15827): jMEM M:65536, U:29404, A:36132, C:-8104, loadScene, ADDED IMAGE b:1, s:11, id:0
04-02 22:38:32.226: I/MEMORY(15827): jMEM M:65536, U:37548, A:27988, C:-8144, loadScene, ADDED IMAGE b:1, s:11, id:1
04-02 22:38:32.526: I/MEMORY(15827): jMEM M:65536, U:45652, A:19884, C:-8104, loadScene, ADDED IMAGE b:1, s:11, id:2
04-02 22:38:32.816: I/MEMORY(15827): jMEM M:65536, U:53756, A:11780, C:-8104, loadScene, ADDED IMAGE b:1, s:11, id:3
04-02 22:38:34.396: I/MEMORY(15827): jMEM M:65536, U:53756, A:11780, C:0, clearScene, CLEARED VIEW id:3
04-02 22:38:34.396: I/MEMORY(15827): jMEM M:65536, U:53756, A:11780, C:0, clearScene, CLEARED VIEW id:2
04-02 22:38:34.396: I/MEMORY(15827): jMEM M:65536, U:53756, A:11780, C:0, clearScene, CLEARED VIEW id:1
04-02 22:38:34.396: I/MEMORY(15827): jMEM M:65536, U:53756, A:11780, C:0, clearScene, CLEARED VIEW id:0
04-02 22:38:34.426: I/MEMORY(15827): jMEM M:65536, U:53756, A:11780, C:0, clearScene, AFTER TRASH COLLECTOR
04-02 22:38:34.886: I/MEMORY(15827): jMEM M:65536, U:53756, A:11780, C:0, loadScene, ADDED IMAGE b:2, s:0, id:0
04-02 22:38:35.776: I/MEMORY(15827): jMEM M:65536, U:53756, A:11780, C:0, clearScene, CLEARED VIEW id:0
04-02 22:38:35.816: I/MEMORY(15827): jMEM M:65536, U:21300, A:44236, C:32456, clearScene, AFTER TRASH COLLECTOR
04-02 22:38:36.256: I/MEMORY(15827): jMEM M:65536, U:29404, A:36132, C:-8104, loadScene, ADDED IMAGE b:2, s:1, id:0
04-02 22:38:36.976: I/MEMORY(15827): jMEM M:65536, U:29404, A:36132, C:0, clearScene, CLEARED VIEW id:0
04-02 22:38:37.006: I/MEMORY(15827): jMEM M:65536, U:29404, A:36132, C:0, clearScene, AFTER TRASH COLLECTOR
04-02 22:38:37.436: I/MEMORY(15827): jMEM M:65536, U:29404, A:36132, C:0, loadScene, ADDED IMAGE b:2, s:2, id:0
04-02 22:38:37.816: I/MEMORY(15827): jMEM M:65536, U:37548, A:27988, C:-8144, loadScene, ADDED IMAGE b:2, s:2, id:1
04-02 22:38:44.986: I/MEMORY(15827): jMEM M:65536, U:37532, A:28004, C:16, clearScene, CLEARED VIEW id:1
04-02 22:38:44.986: I/MEMORY(15827): jMEM M:65536, U:37532, A:28004, C:0, clearScene, CLEARED VIEW id:0
04-02 22:38:45.016: I/MEMORY(15827): jMEM M:65536, U:37532, A:28004, C:0, clearScene, AFTER TRASH COLLECTOR
04-02 22:38:45.496: I/MEMORY(15827): jMEM M:65536, U:37532, A:28004, C:0, loadScene, ADDED IMAGE b:2, s:3, id:0
04-02 22:38:45.996: I/MEMORY(15827): jMEM M:65536, U:45636, A:19900, C:-8104, loadScene, ADDED IMAGE b:2, s:3, id:1
04-02 22:38:48.306: I/MEMORY(15827): jMEM M:65536, U:45636, A:19900, C:0, clearScene, CLEARED VIEW id:1
04-02 22:38:48.306: I/MEMORY(15827): jMEM M:65536, U:45636, A:19900, C:0, clearScene, CLEARED VIEW id:0
04-02 22:38:48.336: I/MEMORY(15827): jMEM M:65536, U:45636, A:19900, C:0, clearScene, AFTER TRASH COLLECTOR
04-02 22:38:48.846: I/MEMORY(15827): jMEM M:65536, U:45636, A:19900, C:0, loadScene, ADDED IMAGE b:2, s:4, id:0
04-02 22:38:49.326: I/MEMORY(15827): jMEM M:65536, U:45636, A:19900, C:0, loadScene, ADDED IMAGE b:2, s:4, id:1
04-02 22:38:49.856: I/MEMORY(15827): jMEM M:65536, U:53740, A:11796, C:-8104, loadScene, ADDED IMAGE b:2, s:4, id:2
04-02 22:38:50.386: I/MEMORY(15827): jMEM M:65536, U:61844, A:3692, C:-8104, loadScene, ADDED IMAGE b:2, s:4, id:3
04-02 22:38:59.486: I/MEMORY(15827): jMEM M:65536, U:61832, A:3704, C:12, clearScene, CLEARED VIEW id:3
04-02 22:38:59.486: I/MEMORY(15827): jMEM M:65536, U:61832, A:3704, C:0, clearScene, CLEARED VIEW id:2
04-02 22:38:59.486: I/MEMORY(15827): jMEM M:65536, U:61832, A:3704, C:0, clearScene, CLEARED VIEW id:1
04-02 22:38:59.486: I/MEMORY(15827): jMEM M:65536, U:61832, A:3704, C:0, clearScene, CLEARED VIEW id:0
04-02 22:38:59.516: I/MEMORY(15827): jMEM M:65536, U:61832, A:3704, C:0, clearScene, AFTER TRASH COLLECTOR
04-02 22:38:59.936: I/MEMORY(15827): jMEM M:65536, U:61832, A:3704, C:0, loadScene, ADDED IMAGE b:2, s:5, id:0
04-02 22:39:00.356: I/MEMORY(15827): jMEM M:65536, U:61832, A:3704, C:0, loadScene, ADDED IMAGE b:2, s:5, id:1
我已经在http://developer.android.com/training/displaying-bitmaps/index.html上进行了"有效显示位图"培训
I've also been through the following stackoverflow questions:
Recycle ImageView's Bitmap
ImageView: automatically recycle bitmap if ImageView is not visible (within ScrollView)
android - out of memory exception when creating bitmap
Bitmap decodeStream OutOfMemory Exception
Detect application heap size in Android
android createBitmap OOM when ((freeMemory > bitmapSize) && (nativeFreeHeap < bitmap size))
android 495KB image taking 10MB of Heap size
Android ImageView setImageBitmap
Android Memory Leak solution
Android custom view Bitmap memory leak
And many many more articles across the web!
To clarify, this only seems to happen in my Nexus 7. I haven't experienced the issue on my emulator or my Galaxy Nexus. I think this may be due to the fact that I am scaling the images.
Please help me detect where the memory leak is!
***EDIT (4/2/13) Please help me identify why the logs from an emulator running Android 10 (2.3.3) show the system allocating memory and the garbage then clearing in exactly like it should, and the logs from my Nexus 7 running Android 17 (4.2) show the system allocating memory and the garbage collector clearing memory apparently at random?
我无法确定为什么不同平台之间的内存分配和收集不同，但我能够通过缩小图像以适应可用内存来缓解问题并防止我的应用程序在任何平台上崩溃。
第一个函数确定位图内存的存储位置（本机或 Java），然后计算剩余的可用内存（以 KB 为单位）。
private long calcAvailableMemory()
{
long value = Runtime.getRuntime().maxMemory();
String type = "";
if (android.os.Build.VERSION.SDK_INT >= 11)
{
value = value / 1024) - (Runtime.getRuntime().totalMemory() / 1024);
type = "JAVA";
}
else
{
value = value / 1024) - (Debug.getNativeHeapAllocatedSize() / 1024);
type = "NATIVE";
}
Log.i(TAG, "calcAvailableMemory, size = " + value + ", type = " + type);
return value;
}
第二个函数创建一个 ImageView 以附加到布局。Show 对象包含我需要初始化 ImageView 的不同变量，例如尺寸和文件路径等。长 maxImageMemory 源自第一个函数，然后除以我附加到布局的视图数量，从而得到最大数量分配每个位图的内存。
private ImageView newImage(Show show, long maxImageMemory)
{
ImageView iv = new ImageView(this);
String filePath = comin.generateFilePath(show);
Bitmap bmp = scaleBitmap(filePath, maxImageMemory);
Log.i(TAG, "newImage, id:" + show.id + ", file:" + filePath + ", x:" + bmp.getWidth() + ", y:" + bmp.getHeight());
iv.setImageBitmap(bmp);
iv.setScaleType(ImageView.ScaleType.FIT_XY);
iv.setId(show.id);
//set visibility
if (show.visible)
iv.setVisibility(View.VISIBLE);
else
iv.setVisibility(View.INVISIBLE);
//set dimensions
int width = (app.getWidth() * show.dimX) / 100;
int height = (app.getHeight() * show.dimY) / 100;
RelativeLayout.LayoutParams rlp = new RelativeLayout.LayoutParams(width, height);
iv.setLayoutParams(rlp);
return iv;
}
第三个函数缩放将加载到函数 2 中创建的 ImageView 中的位图。 while 循环是重要的部分，我在其中增加样本大小，直到位图所需的内存小于可用的最大内存。
private Bitmap scaleBitmap(String path, long maxImageMemory)
{
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(path, options);
int sample = 1;
//Scale image to screen resolution
if (options.outHeight > app.getHeight() || options.outWidth > app.getWidth())
{
int heightRatio = Math.round((float) options.outHeight / (float) app.getHeight());
int widthRatio = Math.round((float) options.outWidth / (float) app.getWidth());
sample = heightRatio < widthRatio ? heightRatio : widthRatio;
}
//Scale image to stay within memory limitations
while (calcBitmapSize(options.outWidth, options.outHeight, sample) > maxImageMemory)
{
sample++;
}
options.inSampleSize = sample;
options.inPurgeable = true;
options.inInputShareable = true;
options.inJustDecodeBounds = false;
Log.i(TAG, "scaleBitmap, scaleSample = " + sample);
return BitmapFactory.decodeFile(path, options);
}
第四个函数根据原始分辨率以及建议的样本大小计算位图所需的内存量。
private long calcBitmapSize(int width, int height, int sample)
{
long value = ((width/sample) * (height/sample) * 4) / 1024;
Log.i(TAG, "calcBitmapSize, size = " + value);
return value;
}
最后，我开发了这个功能来帮助解决所有这些内存问题。它根据您运行的 Android 版本记录内存利用率。
private void logMemory(String callingFunction)
{
long max = Runtime.getRuntime().maxMemory() / 1024;
if (debugJavaMemory)
{
long used = Runtime.getRuntime().totalMemory() / 1024;
long available = max - used;
long change = available - availableJavaMemoryOld;
if (availableJavaMemoryOld != 0)
Log.i(TAG_MEMORY, "jMEM M:" + max + ", U:" + used + ", A:" + available + ", C:" + change + ", " + callingFunction);
availableJavaMemoryOld = available;
}
else if (debugNativeMemory)
{
long used = Debug.getNativeHeapAllocatedSize() / 1024;
long available = max - used;
long change = available - availableNativeMemoryOld;
if (availableNativeMemoryOld != 0)
Log.i(TAG_MEMORY, "nMEM M:" + max + ", U:" + used + ", A:" + available + ", C:" + change + ", " + callingFunction);
availableNativeMemoryOld = available;
}
}
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