android - 方向更改时应用程序崩溃(就在我为纵向和横向模式设置 2 个不同的背景时)

标签 android drawable out-of-memory android-orientation orientation-changes

我使用 JPG 背景作为 Activity 的 Root View ，并将其放在 drawable 文件夹中。一切都很好，直到我决定为纵向和横向使用 2 种不同的墙纸。所以，我将第二张壁纸放在 drawable-land 文件夹中。

现在的问题是:当我在真实设备上测试应用程序时，每次我改变方向两次(从纵向到横向，然后从横向到纵向)，应用程序崩溃并且我看到一个很长的错误日志，关于 OutOfMemoryException:

09-08 14:13:21.567: E/dalvikvm-heap(16536): Out of memory on a 16384016-byte allocation.
09-08 14:13:21.567: I/dalvikvm(16536): "main" prio=5 tid=1 RUNNABLE
09-08 14:13:21.567: I/dalvikvm(16536):   | group="main" sCount=0 dsCount=0 obj=0x40ad2478 self=0x149a9d0
09-08 14:13:21.567: I/dalvikvm(16536):   | sysTid=16536 nice=0 sched=0/0 cgrp=default handle=1074488712
09-08 14:13:21.567: I/dalvikvm(16536):   | schedstat=( 0 0 0 ) utm=346 stm=52 core=1
09-08 14:13:21.567: I/dalvikvm(16536):   at android.graphics.Bitmap.nativeCreate(Native Method)
09-08 14:13:21.567: I/dalvikvm(16536):   at android.graphics.Bitmap.createBitmap(Bitmap.java:605)
09-08 14:13:21.567: I/dalvikvm(16536):   at android.graphics.Bitmap.createBitmap(Bitmap.java:551)
09-08 14:13:21.567: I/dalvikvm(16536):   at android.graphics.Bitmap.createScaledBitmap(Bitmap.java:437)
09-08 14:13:21.567: I/dalvikvm(16536):   at android.graphics.BitmapFactory.finishDecode(BitmapFactory.java:530)
09-08 14:13:21.567: I/dalvikvm(16536):   at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:505)
09-08 14:13:21.567: I/dalvikvm(16536):   at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:357)
09-08 14:13:21.567: I/dalvikvm(16536):   at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:777)
09-08 14:13:21.567: I/dalvikvm(16536):   at android.content.res.Resources.loadDrawable(Resources.java:1940)
09-08 14:13:21.567: I/dalvikvm(16536):   at android.content.res.TypedArray.getDrawable(TypedArray.java:601)
09-08 14:13:21.567: I/dalvikvm(16536):   at android.view.View.<init>(View.java:2844)
09-08 14:13:21.567: I/dalvikvm(16536):   at android.view.View.<init>(View.java:2781)
09-08 14:13:21.567: I/dalvikvm(16536):   at android.view.ViewGroup.<init>(ViewGroup.java:412)
09-08 14:13:21.577: I/dalvikvm(16536):   at android.widget.RelativeLayout.<init>(RelativeLayout.java:179)
09-08 14:13:21.577: I/dalvikvm(16536):   at java.lang.reflect.Constructor.constructNative(Native Method)
09-08 14:13:21.577: I/dalvikvm(16536):   at java.lang.reflect.Constructor.newInstance(Constructor.java:417)
09-08 14:13:21.577: I/dalvikvm(16536):   at android.view.LayoutInflater.createView(LayoutInflater.java:586)
09-08 14:13:21.577: I/dalvikvm(16536):   at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56)
09-08 14:13:21.577: I/dalvikvm(16536):   at android.view.LayoutInflater.onCreateView(LayoutInflater.java:653)
09-08 14:13:21.577: I/dalvikvm(16536):   at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:678)
09-08 14:13:21.577: I/dalvikvm(16536):   at android.view.LayoutInflater.inflate(LayoutInflater.java:466)
09-08 14:13:21.577: I/dalvikvm(16536):   at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
09-08 14:13:21.577: I/dalvikvm(16536):   at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
09-08 14:13:21.577: I/dalvikvm(16536):   at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:255)
09-08 14:13:21.577: I/dalvikvm(16536):   at android.app.Activity.setContentView(Activity.java:1835)
09-08 14:13:21.577: I/dalvikvm(16536):   at com.test.IndexActivity.onCreate(IndexActivity.java:58)
09-08 14:13:21.577: I/dalvikvm(16536):   at android.app.Activity.performCreate(Activity.java:4465)
09-08 14:13:21.577: I/dalvikvm(16536):   at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
09-08 14:13:21.577: I/dalvikvm(16536):   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1931)
09-08 14:13:21.577: I/dalvikvm(16536):   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1992)
09-08 14:13:21.577: I/dalvikvm(16536):   at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3371)
09-08 14:13:21.577: I/dalvikvm(16536):   at android.app.ActivityThread.access$700(ActivityThread.java:127)
09-08 14:13:21.577: I/dalvikvm(16536):   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1162)
09-08 14:13:21.577: I/dalvikvm(16536):   at android.os.Handler.dispatchMessage(Handler.java:99)
09-08 14:13:21.577: I/dalvikvm(16536):   at android.os.Looper.loop(Looper.java:137)
09-08 14:13:21.577: I/dalvikvm(16536):   at android.app.ActivityThread.main(ActivityThread.java:4441)
09-08 14:13:21.577: I/dalvikvm(16536):   at java.lang.reflect.Method.invokeNative(Native Method)
09-08 14:13:21.577: I/dalvikvm(16536):   at java.lang.reflect.Method.invoke(Method.java:511)
09-08 14:13:21.577: I/dalvikvm(16536):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:823)
09-08 14:13:21.577: I/dalvikvm(16536):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590)
09-08 14:13:21.577: I/dalvikvm(16536):   at dalvik.system.NativeStart.main(Native Method)
09-08 14:13:21.577: D/AndroidRuntime(16536): Shutting down VM
09-08 14:13:21.577: W/dalvikvm(16536): threadid=1: thread exiting with uncaught exception (group=0x40ad1210)
09-08 14:13:21.597: E/AndroidRuntime(16536): FATAL EXCEPTION: main
09-08 14:13:21.597: E/AndroidRuntime(16536): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test/com.test.IndexActivity}: android.view.InflateException: Binary XML file line #1: Error inflating class <unknown>
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1967)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1992)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3371)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.app.ActivityThread.access$700(ActivityThread.java:127)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1162)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.os.Handler.dispatchMessage(Handler.java:99)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.os.Looper.loop(Looper.java:137)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.app.ActivityThread.main(ActivityThread.java:4441)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at java.lang.reflect.Method.invokeNative(Native Method)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at java.lang.reflect.Method.invoke(Method.java:511)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:823)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at dalvik.system.NativeStart.main(Native Method)
09-08 14:13:21.597: E/AndroidRuntime(16536): Caused by: android.view.InflateException: Binary XML file line #1: Error inflating class <unknown>
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.view.LayoutInflater.createView(LayoutInflater.java:606)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.view.LayoutInflater.onCreateView(LayoutInflater.java:653)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:678)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.view.LayoutInflater.inflate(LayoutInflater.java:466)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:255)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.app.Activity.setContentView(Activity.java:1835)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at com.rahpou.android.parnian.IndexActivity.onCreate(IndexActivity.java:58)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.app.Activity.performCreate(Activity.java:4465)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1931)
09-08 14:13:21.597: E/AndroidRuntime(16536):    ... 12 more
09-08 14:13:21.597: E/AndroidRuntime(16536): Caused by: java.lang.reflect.InvocationTargetException
09-08 14:13:21.597: E/AndroidRuntime(16536):    at java.lang.reflect.Constructor.constructNative(Native Method)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at java.lang.reflect.Constructor.newInstance(Constructor.java:417)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.view.LayoutInflater.createView(LayoutInflater.java:586)
09-08 14:13:21.597: E/AndroidRuntime(16536):    ... 24 more
09-08 14:13:21.597: E/AndroidRuntime(16536): Caused by: java.lang.OutOfMemoryError
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.graphics.Bitmap.nativeCreate(Native Method)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.graphics.Bitmap.createBitmap(Bitmap.java:605)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.graphics.Bitmap.createBitmap(Bitmap.java:551)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.graphics.Bitmap.createScaledBitmap(Bitmap.java:437)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.graphics.BitmapFactory.finishDecode(BitmapFactory.java:530)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:505)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:357)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:777)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.content.res.Resources.loadDrawable(Resources.java:1940)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.content.res.TypedArray.getDrawable(TypedArray.java:601)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.view.View.<init>(View.java:2844)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.view.View.<init>(View.java:2781)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.view.ViewGroup.<init>(ViewGroup.java:412)
09-08 14:13:21.597: E/AndroidRuntime(16536):    at android.widget.RelativeLayout.<init>(RelativeLayout.java:179)
09-08 14:13:21.597: E/AndroidRuntime(16536):    ... 27 more

似乎加载另一个 drawable 的成本太高了，但我看到很多应用程序使用大而多样的图形和壁纸并且没有问题。那么，我该如何防止这种内存泄漏并帮助 android 回收/销毁以前的背景可绘制对象以避免 OutOfMemory？!

如果这很重要，我的手机屏幕和壁纸具有高清 (720p) 分辨率，并且两个壁纸(港口和陆地)的大小都约为 100 KB。

编辑:我尝试了第一个答案并在我的代码中修改了它，因为我有一个 ScrollView 作为 Root View 并且壁纸设置为其背景可绘制。

@Override
public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);            

    ScrollView root = (ScrollView)findViewById(R.id.root);
    // this line causes NullPointerException:
    BitmapDrawable drawable = (BitmapDrawable) root.getBackground();
    Bitmap bitmap = drawable.getBitmap();
    if (bitmap != null)
    {
    bitmap.recycle();
    }
}

但事情变得更糟，我在代码中指定的行的第一次方向更改时遇到了 NullPointerException。

另外一个问题是，为什么创建高清位图需要分配 16 MB 内存？!!我认为 1280px x 800px x 8(字节/像素)= 8 MB 那么为什么需要 16 MB？!! (我指的是 LogCat 的第一行，其中显示“16384016 字节分配内存不足。”和 16384016 字节 ~ 16 MB。

最佳答案

使用下面的代码。

@Override
public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);            

    myImage = findViewById(R.id.myImage);
    BitmapDrawable drawable = (BitmapDrawable) myImage.getDrawable();
    Bitmap bitmap = drawable.getBitmap();
    if (bitmap != null)
    {
        bitmap.recycle();
    }       
}

在 list 中:

<activity
  ...
    android:configChanges="keyboardHidden|orientation"
  ...
>
</activity>

关于android - 方向更改时应用程序崩溃(就在我为纵向和横向模式设置 2 个不同的背景时)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/12330322/

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