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Android：将图像加载到位图对象时出现奇怪的内存不足问题

我开发了将文件解码为位图的应用程序。我完成了以下代码，但它总是抛出内存异常

private Bitmap decodeFile(File f) {
            Bitmap bmp = null;
    FileInputStream fis = null;
    try {
        // decode image size
        BitmapFactory.Options o = new BitmapFactory.Options();
        o.inTempStorage = new byte[16*1024];
        o.inJustDecodeBounds = true;
        o.inPurgeable=true;
        //if(!f.exists()) f.createNewFile();

        if(!f.exists()) f.createNewFile();

        fis = new FileInputStream(f);
        BitmapFactory.decodeStream(fis, null, o);
        try {
            fis.close();
        } catch (IOException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
        fis = null;
        // Find the correct scale value. It should be the power of 2.
        final int REQUIRED_SIZE = 70;
        int width_tmp = o.outWidth, height_tmp = o.outHeight;
        int scale = 1;
        while (true) {
            if (width_tmp / 2 < REQUIRED_SIZE
                    || height_tmp / 2 < REQUIRED_SIZE)
                break;
            width_tmp /= 2;
            height_tmp /= 2;
            scale *= 2;
        }

        // decode with inSampleSize
        BitmapFactory.Options o2 = new BitmapFactory.Options();
        o2.inTempStorage = new byte[16*1024];
        o2.inSampleSize = scale;            
        o2.inPurgeable=true;
        o2.inTempStorage = new byte[16*1024];

        fis = new FileInputStream(f);
        bmp = BitmapFactory.decodeStream(fis);
        if (fis != null)
            fis.close();
        fis = null;
        return bmp;
        // return BitmapFactory.decodeFile(f.getAbsolutePath(), o2);
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } finally {

        System.gc();
        try {
            if (fis != null)
                fis.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
    }
        fis = null;

    }
          return null;
}

添加了日志猫

12-03 12:03:05.070: E/AndroidRuntime(30696): FATAL EXCEPTION: main
12-03 12:03:05.070: E/AndroidRuntime(30696): java.lang.OutOfMemoryError
12-03 12:03:05.070: E/AndroidRuntime(30696):    at  android.graphics.BitmapFactory.nativeDecodeStream(Native Method)
12-03 12:03:05.070: E/AndroidRuntime(30696):    at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:527)
12-03 12:03:05.070: E/AndroidRuntime(30696):    at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:301)
12-03 12:03:05.070: E/AndroidRuntime(30696):    at com.dexterity.iPinion.RootActivity.readFromSDCard(RootActivity.java:1984)
12-03 12:03:05.070: E/AndroidRuntime(30696):    at com.dexterity.iPinion.RootActivity.setBrandingImage(RootActivity.java:285)
12-03 12:03:05.070: E/AndroidRuntime(30696):    at com.dexterity.iPinion.RootActivity.access$0(RootActivity.java:252)
12-03 12:03:05.070: E/AndroidRuntime(30696):    at com.dexterity.iPinion.RootActivity$1.handleMessage(RootActivity.java:515)
12-03 12:03:05.070: E/AndroidRuntime(30696):    at android.os.Handler.dispatchMessage(Handler.java:99)
12-03 12:03:05.070: E/AndroidRuntime(30696):    at android.os.Looper.loop(Looper.java:137)
12-03 12:03:05.070: E/AndroidRuntime(30696):    at  android.app.ActivityThread.main(ActivityThread.java:4745)
12-03 12:03:05.070: E/AndroidRuntime(30696):    at java.lang.reflect.Method.invokeNative(Native Method)
12-03 12:03:05.070: E/AndroidRuntime(30696):    at java.lang.reflect.Method.invoke(Method.java:511)
12-03 12:03:05.070: E/AndroidRuntime(30696):    at  com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
12-03 12:03:05.070: E/AndroidRuntime(30696):    at   com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
12-03 12:03:05.070: E/AndroidRuntime(30696):    at dalvik.system.NativeStart.main(Native   Method)
4

2 回答 2

2

您正在设置 BitmapFactory.Options，但您没有将它们传递给您的 BitmapFactory.decodeStream。

你有：

BitmapFactory.decodeStream(fis);

应该：

BitmapFactory.decodeStream(fis, o2);

另请阅读Android 的显示位图

此外，根据您的设备，您可能只有很少的运行时内存。对于 24MB 或更少的旧设备来说尤其如此，大多数较新的设备是 64MB 或更大。你可以检查

Runtime.getRuntime().maxMemory()

此外，您可以通过将 'android:largeHeap="true" ' 添加到 AndroidManifest.xml 文件来强制使用大堆。在我的 Galaxy Nexus 上将我的堆推到 254MB。

于 2012-12-03T06:28:48.183 回答
2

Android内存非常低约14mb

要在您的应用程序中使用位图，请使用此链接，使用 bitmpas 的官方 android 链接

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

于 2012-12-03T06:29:36.287 回答