android - 位图大小超过旧设备上的 VM 预算

Question

我在 BitmapFactory 中遇到异常。我读过其他问题，唯一的解决方案是加载我的图像的缩小版本，但在我的情况下，我需要以全分辨率显示它们并带有缩放系统(图像是包含文本的传单) . 300ko 的图像只有 466x700px，它们显示如下:

Viewpager 类:

@Override
public View instantiateItem(ViewGroup container, int position) {
    ImageView imageView = new ImageView(container.getContext());
    PhotoViewAttacher attacher = new PhotoViewAttacher(imageView);
    try {
        Drawable toRecycle = imageView.getDrawable();
        if (toRecycle != null) {
            ((BitmapDrawable) imageView.getDrawable()).getBitmap().recycle();
        }
        imageView.setImageDrawable(getCat()[position]);
    } catch (IOException e) {
        e.printStackTrace();
    }
    attacher.update();
    container.addView(imageView);
    return imageView;
}

还有 getCat() :

public static Drawable[] getTheme_amiante_s_carreleur(Context ctx) throws IOException {
    ZipResourceFile expansionFile = APKExpansionSupport.getAPKExpansionZipFile(ctx, 2, 1);
    Drawable[] theme_amiante_s_carreleur = {
        Drawable.createFromStream(expansionFile.getInputStream("amiante_carreleur_s_1.png"), "src"),
        Drawable.createFromStream(expansionFile.getInputStream("amiante_carreleur_s_2.png"), "src"),
        Drawable.createFromStream(expansionFile.getInputStream("amiante_carreleur_s_3.png"), "src"),
        Drawable.createFromStream(expansionFile.getInputStream("amiante_carreleur_s_4.png"), "src"),
        Drawable.createFromStream(expansionFile.getInputStream("amiante_carreleur_s_5.png"), "src"), };
    return theme_amiante_s_carreleur;
}

它在我的 Nexus 4 上运行良好，但在 Galaxy S2 或 LG Optimus Black 上，由于内存不足错误，系统很快强制关闭:

java.lang.OutOfMemoryError: bitmap size exceeds VM budget 
at android.graphics.BitmapFactory.nativeDecodeStream(Native Method) 
at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:573) 
at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:439) 
at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:697) 
at android.graphics.drawable.Drawable.createFromStream(Drawable.java:657) 
at com.ctai.iris.ListeImages.getTheme_formation_ce_obligatoires(ListeImages.java:1163) 
at com.ctai.iris.ImageViewLow.getCat(ImageViewLow.java:186) 
at com.ctai.iris.ImageViewLow$SamplePagerAdapter.instantiateItem(ImageViewLow.java:77) 
at com.ctai.iris.ImageViewLow$SamplePagerAdapter.instantiateItem(ImageViewLow.java:1) 
at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:801) 
at android.support.v4.view.ViewPager.populate(ViewPager.java:992) 
at android.support.v4.view.ViewPager.populate(ViewPager.java:881) 
at android.support.v4.view.ViewPager$3.run(ViewPager.java:237) 
at android.os.Handler.handleCallback(Handler.java:587)
at android.os.Handler.dispatchMessage(Handler.java:92) 
at android.os.Looper.loop(Looper.java:130) 
at android.app.ActivityThread.main(ActivityThread.java:3691) 
at java.lang.reflect.Method.invokeNative(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:507) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:907) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:665) 
at dalvik.system.NativeStart.main(Native Method)

知道如何处理这个问题吗？

Answer 1

不使用时回收位图。压缩位图以减少内存使用。看看这个链接。 http://developer.android.com/training/displaying-bitmaps/load-bitmap.html .

使用 MAT 分析器检查位图使用了多少内存。

检查链接。讨论内存管理以及如何使用 MAT 查找内存泄漏。 http://www.youtube.com/watch?v=_CruQY55HOk .

同时删除 Drawables 的静态。我不确定，但请尝试一下。