Android 位图 imageview 内存泄漏-移动开发问题

Android bitmap imageview memory leak(Android 位图 imageview 内存泄漏)

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问题描述

我将 4x4 imageView 放到一个活动(BoardActivity)中，用户可以通过单击它们来更改图像.使用 HTC Desire (Android 2.2.2)，我在大约 30 分钟的密集使用中得到了 OOM(内存不足)-此活动的第 16 次开始-，但没有其他设备产生这种情况(android2.1 和安卓 2.2.1).是否有可能，我在位图/图像视图的使用上犯了一些错误，导致了这个错误?首先，我将所有资源 ID 加载到地图中:

I put 4x4 imageView to an activity(BoardActivity), and user can change the images by clicking them. With HTC Desire (Android 2.2.2), I got OOM(Out Of Memory) in about 30 minutes of intensive useage - 16th start of this activity-, but no other devices produces this (android 2.1, and android 2.2.1). Is it possible, that I made some mistake with the bitmap/imageview useage and that causes this error? First, I load all resource ID into a map:

private Map<String, Integer> imageResourceMap;
imageResourceMap = new HashMap<String, Integer>();
        imageResourceMap.put("a", R.drawable.a);
        imageResourceMap.put("b", R.drawable.b);
        imageResourceMap.put("c", R.drawable.c);
//... I store 55 drawable's resourceId in this map

然后我调整每个图像的大小并将其保存到位图中，以 Map 表示:

Then I resize and save every image into bitmap, represented in Map:

private static Map<String, Bitmap> imageBitmap;

    private void loadBitmaps(int imagesSize) {

    for (String s : imageResourceMap.keySet()) {
        Bitmap tmp = getBitmapFromRes(imageResourceMap.get(s), imagesSize);
        imageBitmap.put(s, tmp);
    }
}

private Bitmap getBitmapFromRes(int resId, int imageSize) {
    Bitmap b = null;
    try {
        // Decode image size
        BitmapFactory.Options o = new BitmapFactory.Options();
        o.inJustDecodeBounds = true;

        InputStream fis = getResources().openRawResource(resId);
        BitmapFactory.decodeStream(fis, null, o);
        fis.close();

        int scale = 1;
        if (o.outHeight > imageSize || o.outWidth > imageSize) {
            scale = (int) Math.pow(2, (int) Math.round(Math.log(imageSize / (double) Math.max(o.outHeight, o.outWidth)) / Math.log(0.5)));
        }

        // Decode with inSampleSize
        BitmapFactory.Options o2 = new BitmapFactory.Options();
        o2.inSampleSize = scale;
        fis = getResources().openRawResource(resId);
        b = BitmapFactory.decodeStream(fis, null, o2);
        fis.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return b;
}

我将图像视图保存在一个数组中，并使用此函数初始化所有图像:

I keep the imageViews in an array, and init all images with this function:

private static ImageView[][] imageViews;

private ImageView getImage(String name) {
        MyImageView item = new MyImageView(this, i, j, c + "");
        item.setImageBitmap(imageBitmap.get(name));
        item.setAdjustViewBounds(true);
        return item;
    }

当我需要更改图像时，我只需更改其资源:

When I need to change an image, I simple change its resource:

imageViews[i][j].setImageBitmap(imageBitmap.get("a"));

在我完成活动之前，我回收位图:

And right before I finish the activity, I recycle the bitmap map:

private void recycleImageBitmaps() {
    for (Bitmap b : imageBitmap.values()) {
        if (b != null) {
            b.recycle();
        }
    }

}

在 AndroidManifest.xml 我声明了这个活动singleTask":

In AndroidManifest.xml I declared this activity "singleTask":

<activity android:name=".game.board.BoardActivity" android:launchMode="singleTask">
    </activity>

在此应用程序(游戏)中，我们多次重新打开此活动...我做错了什么?这会导致 Out Of Memory 错误吗?

In this application(game), we reopen this activity a several times... What did I wrong? Can this cause the Out Of Memory error?

更正像这样更正了 getBitmapFromRes:

CORRECTION Corrected the getBitmapFromRes like this:

private Bitmap getBitmapFromRes(int resId, int imageSize) {
    Bitmap tmp = null;
    Bitmap b = null;
    try {
        // Decode image size
        BitmapFactory.Options o = new BitmapFactory.Options();
        o.inJustDecodeBounds = true;

        InputStream fis = getResources().openRawResource(resId);
        tmp = BitmapFactory.decodeStream(fis, null, o);
        fis.close();

        int scale = 1;
        if (o.outHeight > imageSize || o.outWidth > imageSize) {
            scale = (int) Math.pow(2, (int) Math.round(Math.log(imageSize / (double) Math.max(o.outHeight, o.outWidth)) / Math.log(0.5)));
        }

        // Decode with inSampleSize
        BitmapFactory.Options o2 = new BitmapFactory.Options();
        o2.inSampleSize = scale;
        fis = getResources().openRawResource(resId);
        b = BitmapFactory.decodeStream(fis, null, o2);
        fis.close();
    } catch (IOException e) {
        e.printStackTrace();
    }finally{
        if(tmp != null){
            tmp.recycle();
            tmp = null;
        }
    }
    return b;
}

HTC 在第 11 次活动开始时仍然崩溃.

HTC still crashed at the 11th start of this activity.

此活动(BoardActivity)从具有 4 个 imageButton 的 Activity(MenuActivity)启动，并且位于 Tabhost 活动中.imageButtons 声明如下所示:

This activity(BoardActivity) launch from an Activity(MenuActivity), which have 4 imageButton, and is in a Tabhost activity. The imageButtons declarations look like this:

<ImageButton
    android:id="@+id/game_menu_CreateButton"
    android:layout_width="120dip" 
    android:layout_height="120dip"
    android:layout_alignRight="@+id/textView1"
    android:layout_alignTop="@+id/textView1"
    android:background="@drawable/create" 
    android:layout_marginRight="1sp"
    android:layout_marginTop="10sp"
     />

当我从 MenuActivity 启动 BoardActivity 时，我不会在 MenuActivity 调用 finish()，而当我在 BoardActivity 调用 finish() 时，我不会't 开始一个新的意图，所以它只是返回到已经打开的 MenuActivity.而这16轮，我就OOM了.

When I start the BoardActivity from MenuActivity, I don't call finish() at MenuActivity, and when I call finish() at the BoardActivity, I don't start a new intent, so it just return to the already opened MenuActivity. And the 16 round of this, I got the OOM.

Android 位图 imageview 内存泄漏

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