16571536字节分配的内存不足

Question

基本上我是为Android 4.4.2锁屏背景添加一个壁纸选择器,当图像设置后我关闭屏幕然后重新开启以查看锁屏我的屏幕变黑并且logcat给我一个内存不足分配错误.到目前为止,我已经尝试使用Bitmap decodeFile(String pathName),我也重新使用Bitmap decodeFile(String pathName,Options opts),但结果是每次都相同...

以下是用于设置图像的原始方法:

private static final String WALLPAPER_IMAGE_PATH =
        "/data/data/com.android.settings/files/lockscreen_wallpaper.png";

private KeyguardUpdateMonitorCallback mBackgroundChanger = new KeyguardUpdateMonitorCallback() {
    @Override
    public void onSetBackground(Bitmap bmp) {
        if (bmp != null) {
            mKeyguardHost.setCustomBackground(
                    new BitmapDrawable(mContext.getResources(), bmp));
        }
        else {
            File file = new File(WALLPAPER_IMAGE_PATH);
            if (file.exists()) {
                mKeyguardHost.setCustomBackground(
                        new BitmapDrawable(mContext.getResources(), WALLPAPER_IMAGE_PATH));
            }
            else {
                mKeyguardHost.setCustomBackground(null);
            }
        }
        updateShowWallpaper(bmp == null);
    }
};

这是从案例1中调用的:

    public void setCustomBackground(Drawable d) {
        if (!mAudioManager.isMusicActive()) { 

            int mBackgroundStyle = Settings.System.getInt(mContext.getContentResolver(),
                    Settings.System.LOCKSCREEN_BACKGROUND_STYLE, 2);
            int mBackgroundColor = Settings.System.getInt(mContext.getContentResolver(),
                    Settings.System.LOCKSCREEN_BACKGROUND_COLOR, 0x00000000);
            switch (mBackgroundStyle) {
                case 0:
                    d = new ColorDrawable(mBackgroundColor);
                    d.setColorFilter(BACKGROUND_COLOR, PorterDuff.Mode.SRC_OVER);
                    mCustomBackground = d;
                    break;
                case 1:
                    KeyguardUpdateMonitor.getInstance(getContext()).dispatchSetBackground(null);
                    break;
                case 2:
                default:
                    mCustomBackground = d;
            }
            computeCustomBackgroundBounds(mCustomBackground);
            setBackground(mBackgroundDrawable);
        }

        if (!ActivityManager.isHighEndGfx()) {
            mCustomBackground = d;
            if (d != null) {
                d.setColorFilter(BACKGROUND_COLOR, PorterDuff.Mode.SRC_OVER);
            }
            computeCustomBackgroundBounds(mCustomBackground);
            invalidate();
        } else {
            if (getWidth() == 0 || getHeight() == 0) {
                d = null;
            }
            if (d == null) {
                mCustomBackground = null;
                setBackground(mBackgroundDrawable);
                return;
            }
            Drawable old = mCustomBackground;
            if (old == null) {
                old = new ColorDrawable(0);
                computeCustomBackgroundBounds(old);
            }

            d.setColorFilter(BACKGROUND_COLOR, PorterDuff.Mode.SRC_OVER);
            mCustomBackground = d;
            computeCustomBackgroundBounds(d);
            Bitmap b = Bitmap.createBitmap(getWidth(), getHeight(), Bitmap.Config.ARGB_8888);
            Canvas c = new Canvas(b);
            mBackgroundDrawable.draw(c);

            Drawable dd = new BitmapDrawable(b);

            mTransitionBackground = new TransitionDrawable(new Drawable[]{old, dd});
            mTransitionBackground.setCrossFadeEnabled(true);
            setBackground(mTransitionBackground);

            mTransitionBackground.startTransition(200);

            mCustomBackground = dd;
            invalidate();
        }

        if (d != null) {
            d.setColorFilter(BACKGROUND_COLOR, PorterDuff.Mode.SRC_OVER);
        }
        computeCustomBackgroundBounds(mCustomBackground);
        invalidate();
    }

这是我的logcat输出:

I/dalvikvm-heap(13100): Forcing collection of SoftReferences for 16571536-byte allocation
E/dalvikvm-heap(13100): Out of memory on a 16571536-byte allocation.
I/dalvikvm(13100): "main" prio=5 tid=1 RUNNABLE
I/dalvikvm(13100):   | group="main" sCount=0 dsCount=0 obj=0x4159fe40 self=0x414d4548
I/dalvikvm(13100):   | sysTid=13100 nice=0 sched=0/0 cgrp=apps handle=1074098536
I/dalvikvm(13100):   | state=R schedstat=( 0 0 0 ) utm=877 stm=93 core=1
I/dalvikvm(13100):   at android.graphics.BitmapFactory.nativeDecodeStream(Native Method)
I/dalvikvm(13100):   at android.graphics.BitmapFactory.decodeStreamInternal(BitmapFactory.java:613)
I/dalvikvm(13100):   at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:589)
I/dalvikvm(13100):   at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:369)
I/dalvikvm(13100):   at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:395)
I/dalvikvm(13100):   at com.android.keyguard.KeyguardViewManager$1.onSetBackground(KeyguardViewManager.java:127)
I/dalvikvm(13100):   at com.android.keyguard.KeyguardUpdateMonitor.dispatchSetBackground(KeyguardUpdateMonitor.java:452)
I/dalvikvm(13100):   at com.android.keyguard.KeyguardViewManager$ViewManagerHost.setCustomBackground(KeyguardViewManager.java:302)

没有我曾经尝试过的任何工作,任何想法？

EDITED

进一步澄清这是设置中的图像设置:

        } else if (requestCode == REQUEST_PICK_WALLPAPER) {
            FileOutputStream wallpaperStream = null;
            try {
                wallpaperStream = getActivity().openFileOutput(WALLPAPER_NAME,
                        Context.MODE_WORLD_READABLE);

            } catch (FileNotFoundException e) {
                return; // NOOOOO
            }
            Uri selectedImageUri = getLockscreenExternalUri();
            Bitmap bitmap;
            if (data != null) {
                Uri mUri = data.getData();
                try {
                    bitmap = MediaStore.Images.Media.getBitmap(getActivity().getContentResolver(),
                            mUri);
                    bitmap.compress(Bitmap.CompressFormat.PNG, 100, wallpaperStream);

                    Toast.makeText(getActivity(), getResources().getString(R.string.
                            background_result_successful), Toast.LENGTH_LONG).show();
                    Settings.System.putInt(getContentResolver(),
                            Settings.System.LOCKSCREEN_BACKGROUND_STYLE, 1);
                    updateVisiblePreferences();

                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            } else {
                try {
                    bitmap = BitmapFactory.decodeFile(selectedImageUri.getPath());
                    bitmap.compress(Bitmap.CompressFormat.PNG, 100, wallpaperStream);
                } catch (NullPointerException npe) {
                    Log.e(TAG, "SeletedImageUri was null.");
                    Toast.makeText(getActivity(), getResources().getString(R.string.
                            background_result_not_successful), Toast.LENGTH_LONG).show();
                    super.onActivityResult(requestCode, resultCode, data);
                    return;
                }
            }

        }

Answer 1

由于您没有仔细处理图像,因此内存不足.请查看以下问题/答案,以便更好地了解尝试加载图像时会发生什么:将图像加载到Bitmap对象时出现奇怪的内存不足问题

如果您是新开发人员,那么我建议您只使用任何为您加载部分的好库,否则加载图像将非常困难.

Android-Universal-Image-Loader:广泛使用的库https://github.com/nostra13/Android-Universal-Image-Loader

替代毕加索图书馆:一行代码为您完成工作:http://square.github.io/picasso/

更新:

位图占用了大量内存,特别是对于像照片这样的丰富图像.例如,Galaxy Nexus上的相机拍摄的照片最高可达2592x1936像素(5百万像素).如果使用的位图配置是ARGB_8888(默认情况下从Android 2.3开始),则将此图像加载到内存中需要大约19MB的内存(2592*1936*4字节),这会立即耗尽某些设备上的每个应用程序限制.

http://developer.android.com/training/displaying-bitmaps/index.html