我的应用程序中有内存泄漏。所以很自然地我想修复它。问题是我不知道如何使用 DDMS 和内存分配工具,或者它们是垃圾(或两者兼而有之)。所以我想知道是否有另一种方法可以找出我的所有资源都在哪里使用,或者是否有人可以启发我如何使用 DDMS 工具。
PS:是的,我知道我必须单击 DDMS 中的调试按钮,然后导致 HPROF 转储和/或使用更新堆按钮并执行 GC。我可以查看两者的详细信息,但看不到我创建的任何对象。简而言之,我无法阅读我正在查看的内容。
非常感谢任何帮助或启发。
~伊顿
编辑1:
我在自定义视图中的整个绘图方法中添加了一些日志记录。经过一些实验,我发现内存泄漏接缝来自这种方法。
/** 更新后台的仪表独立静态缓冲区缓存。*/
private void regenerate() {
mNeedRegen = false;
// Prevent memory leaks by disposing of old bitmaps.
if (mBackground != null) { mBackground.recycle(); mBackground = null; }
// Our new drawing area
Log.d(TAG, getWidth() + "\t" + getHeight());
mBackground = Bitmap.createBitmap(getWidth(), getHeight(), Bitmap.Config.ARGB_8888);
Canvas backCanvas = new Canvas(mBackground);
float scale = (float)getWidth();
backCanvas.scale(scale, scale);
drawRim(backCanvas);
drawFace(backCanvas);
drawTitle(backCanvas);
if (!(this instanceof EmptySpace)) { drawGroupIcon(backCanvas); }
regenerateBackground(backCanvas);
}
现在,在我的应用程序中摆弄了一番之后,我设法导致了这个错误:
dalvikvm-heap E 195364-byte external allocation too large for this process.
2935 dalvikvm E Out of memory: Heap Size=4871KB, Allocated=2636KB, Bitmap Size=19528KB
2935 GraphicsJNI E VM won't let us allocate 195364 bytes
2935 AndroidRuntime D Shutting down VM
2935 dalvikvm W threadid=1: thread exiting with uncaught exception (group=0x400259f8)
2935 AndroidRuntime E FATAL EXCEPTION: main
2935 AndroidRuntime E java.lang.OutOfMemoryError: bitmap size exceeds VM budget
2935 AndroidRuntime E at android.graphics.Bitmap.nativeCreate(Native Method)
2935 AndroidRuntime E at android.graphics.Bitmap.createBitmap(Bitmap.java:574)
2935 AndroidRuntime E at com.android.appion.arm.widgets.GaugeBase.regenerate(GaugeBase.java:239)
2935 AndroidRuntime E at com.android.appion.arm.widgets.GaugeBase.onSizeChanged(GaugeBase.java:86)
2935 AndroidRuntime E at android.view.View.setFrame(View.java:7101)
2935 AndroidRuntime E at android.view.View.layout(View.java:7028)
2935 AndroidRuntime E at android.widget.GridView.setupChild(GridView.java:1316)
2935 AndroidRuntime E at android.widget.GridView.makeAndAddView(GridView.java:1222)
2935 AndroidRuntime E at android.widget.GridView.makeRow(GridView.java:265)
2935 AndroidRuntime E at android.widget.GridView.fillSpecific(GridView.java:463)
2935 AndroidRuntime E at android.widget.GridView.layoutChildren(GridView.java:1122)
2935 AndroidRuntime E at android.widget.AbsListView.onLayout(AbsListView.java:1147)
2935 AndroidRuntime E at android.view.View.layout(View.java:7034)
2935 AndroidRuntime E at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1249)
2935 AndroidRuntime E at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1125)
2935 AndroidRuntime E at android.widget.LinearLayout.onLayout(LinearLayout.java:1042)
2935 AndroidRuntime E at android.view.View.layout(View.java:7034)
2935 AndroidRuntime E at android.widget.SlidingDrawer.onLayout(SlidingDrawer.java:331)
2935 AndroidRuntime E at android.view.View.layout(View.java:7034)
2935 AndroidRuntime E at android.widget.RelativeLayout.onLayout(RelativeLayout.java:909)
2935 AndroidRuntime E at android.view.View.layout(View.java:7034)
2935 AndroidRuntime E at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
2935 AndroidRuntime E at android.view.View.layout(View.java:7034)
2935 AndroidRuntime E at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1249)
2935 AndroidRuntime E at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1125)
2935 AndroidRuntime E at android.widget.LinearLayout.onLayout(LinearLayout.java:1042)
2935 AndroidRuntime E at android.view.View.layout(View.java:7034)
2935 AndroidRuntime E at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
2935 AndroidRuntime E at android.view.View.layout(View.java:7034)
2935 AndroidRuntime E at android.view.ViewRoot.performTraversals(ViewRoot.java:1049)
2935 AndroidRuntime E at android.view.ViewRoot.handleMessage(ViewRoot.java:1744)
2935 AndroidRuntime E at android.os.Handler.dispatchMessage(Handler.java:99)
2935 AndroidRuntime E at android.os.Looper.loop(Looper.java:144)
2935 AndroidRuntime E at android.app.ActivityThread.main(ActivityThread.java:4937)
2935 AndroidRuntime E at java.lang.reflect.Method.invokeNative(Native Method)
2935 AndroidRuntime E at java.lang.reflect.Method.invoke(Method.java:521)
2935 AndroidRuntime E at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
2935 AndroidRuntime E at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
2935 AndroidRuntime E at dalvik.system.NativeStart.main(Native Method)
错误本身是有道理的。我内存不足。没有意义的是我试图制作的位图是 221 像素乘 221 像素,但显然是 19528kb。如果我的数学是正确的 221 * 221 = 48841 * 4 = 195364字节= 190.7kb。这根本没有任何意义。任何人,请看一看,看看你能找到什么。顺便说一句,错误中的问题如下(来自 regenerate 方法)
mBackground = Bitmap.createBitmap(getWidth(), getHeight(), Bitmap.Config.ARGB_8888);