Question

我有4项活动A，B，C和D.

活动A有一个菜单。其中一个选项打开活动D，其中包含列表视图。活动A通过按钮打开活动B.活动B通过按钮打开活动C.

活动C有4个ImageViews，我在完成后回收它们。

当我执行以下方案时，每件事情都可以：

A - ＆gt; B - 回到 - ＆gt; A - 单击菜单转到D - ＆gt;的确定

当我执行以下方案时，我得到了这个致命的例外：

A - ＆gt; B - ＆gt; C -back to - ＆gt; B - 回到 - ＆gt; A - 单击菜单转到D - ＆gt; 得到例外

活动D和C之间没有关系，但为什么我在这里得到这个例外????

A->B->C (using buttons)

A-> D (using menu)

05-15 11:33:49.600: E/AndroidRuntime(2722): FATAL EXCEPTION: main
05-15 11:33:49.600: E/AndroidRuntime(2722): java.lang.RuntimeException: Canvas: trying to use a recycled bitmap android.graphics.Bitmap@41326810
05-15 11:33:49.600: E/AndroidRuntime(2722):     at android.graphics.Canvas.throwIfRecycled(Canvas.java:1038)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at android.graphics.Canvas.drawBitmap(Canvas.java:1142)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at android.graphics.drawable.BitmapDrawable.draw(BitmapDrawable.java:393)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at android.widget.ImageView.onDraw(ImageView.java:924)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at android.view.View.draw(View.java:10983)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at android.view.ViewGroup.drawChild(ViewGroup.java:2887)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2489)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at android.view.ViewGroup.drawChild(ViewGroup.java:2885)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at android.widget.ListView.drawChild(ListView.java:3223)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2489)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at android.widget.AbsListView.dispatchDraw(AbsListView.java:2092)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at android.widget.ListView.dispatchDraw(ListView.java:3218)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at android.view.View.draw(View.java:11088)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at android.widget.AbsListView.draw(AbsListView.java:3398)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at android.view.ViewGroup.drawChild(ViewGroup.java:2887)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2489)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at android.view.View.draw(View.java:10986)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at android.view.ViewGroup.drawChild(ViewGroup.java:2887)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2489)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at android.view.ViewGroup.drawChild(ViewGroup.java:2885)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2489)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at android.view.ViewGroup.drawChild(ViewGroup.java:2885)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2489)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at android.view.View.draw(View.java:10986)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at android.widget.FrameLayout.draw(FrameLayout.java:450)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:2126)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at android.view.ViewRootImpl.draw(ViewRootImpl.java:2026)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1634)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2442)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at android.os.Handler.dispatchMessage(Handler.java:99)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at android.os.Looper.loop(Looper.java:137)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at android.app.ActivityThread.main(ActivityThread.java:4424)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at java.lang.reflect.Method.invokeNative(Native Method)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at java.lang.reflect.Method.invoke(Method.java:511)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
05-15 11:33:49.600: E/AndroidRuntime(2722):     at dalvik.system.NativeStart.main(Native Method)

Answer 1

我注意到我不应该为不同的活动使用相同的图像资源，而其中一个活动正在回收它的位图。

我在活动C和活动D中为ImageViews使用相同的图像资源（img01.png）。

我将活动C的图像资源更改为img02.png并解决了问题。

但我不知道其合乎逻辑的原因。

Answer 2

仅仅因为你退出活动并不意味着它已经消失了。如果您要回收位图，请确保它们未被使用。您可以在回收位图时将ImageView设置为具有不同的（可能为空白）Drawable。

为什么我得到Canvas：尝试使用回收的位图android.graphics？

2 个答案: