Android:java.lang.OutOfMemoryError:

Question

我开发了一个在Android上使用大量图像的应用程序.

可绘制文件夹中有很多图像说超过100,我正在开发图像动画应用程序.我用imageview来显示GIF图像.我已经将Split gif图像的概念用于多个PNG格式图像,然后使用它.

每次用户进入应用程序时,我都可以看到内存越来越多,直到用户获得java.lang.OutOfMemoryError.

那么处理许多图像的最佳/正确方法是什么？

以下是我的代码:

dog_animation.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/DogView"
android:orientation="vertical" >

<ImageView
    android:id="@+id/dog_animation"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_weight="0.19" />

dog_animation.xml(Drawable文件夹)

<?xml version="1.0" encoding="utf-8"?>

<item
    android:drawable="@drawable/image"
    android:duration="50"/>
<item
    android:drawable="@drawable/image1"
    android:duration="50"/>
<item
    android:drawable="@drawable/image2"
    android:duration="50"/>
<item
    android:drawable="@drawable/image3"
    android:duration="50"/>
<item
    android:drawable="@drawable/image4"
    android:duration="50"/>
<item
    android:drawable="@drawable/image5"
    android:duration="50"/>
<item
    android:drawable="@drawable/image6"
    android:duration="50"/>
<item
    android:drawable="@drawable/image7"
    android:duration="50"/>
<item
    android:drawable="@drawable/image8"
    android:duration="50"/>
<item
    android:drawable="@drawable/image9"
    android:duration="50"/>
<item
    android:drawable="@drawable/image10"
    android:duration="50"/>
<item
    android:drawable="@drawable/image11"
    android:duration="50"/>
<item
    android:drawable="@drawable/image12"
    android:duration="50"/>
<item
    android:drawable="@drawable/image13"
    android:duration="50"/>
<item
    android:drawable="@drawable/image14"
    android:duration="50"/>
<item
    android:drawable="@drawable/image15"
    android:duration="50"/>
<item
    android:drawable="@drawable/image16"
    android:duration="50"/>
<item
    android:drawable="@drawable/image17"
    android:duration="50"/>
<item
    android:drawable="@drawable/image18"
    android:duration="50"/>
<item
    android:drawable="@drawable/image19"
    android:duration="50"/>
<item
    android:drawable="@drawable/image20"
    android:duration="50"/>
<item
    android:drawable="@drawable/image21"
    android:duration="50"/>
<item
    android:drawable="@drawable/image22"
    android:duration="50"/>
<item
    android:drawable="@drawable/image23"
    android:duration="50"/>
<item
    android:drawable="@drawable/image24"
    android:duration="50"/>
<item
    android:drawable="@drawable/image25"
    android:duration="50"/>
<item
    android:drawable="@drawable/image26"
    android:duration="50"/>
<item
    android:drawable="@drawable/image27"
    android:duration="50"/>
<item
    android:drawable="@drawable/image28"
    android:duration="50"/>
<item
    android:drawable="@drawable/image29"
    android:duration="50"/>
<item
    android:drawable="@drawable/image30"
    android:duration="50"/>
<item
    android:drawable="@drawable/image31"
    android:duration="50"/>
<item
    android:drawable="@drawable/image32"
    android:duration="50"/>
<item
    android:drawable="@drawable/image33"
    android:duration="50"/>
<item
    android:drawable="@drawable/image34"
    android:duration="50"/>
<item
    android:drawable="@drawable/image35"
    android:duration="50"/>
<item
    android:drawable="@drawable/image36"
    android:duration="50"/>
<item
    android:drawable="@drawable/image37"
    android:duration="50"/>
<item
    android:drawable="@drawable/image38"
    android:duration="50"/>
<item
    android:drawable="@drawable/image39"
    android:duration="50"/>
<item
    android:drawable="@drawable/image40"
    android:duration="50"/>
<item
    android:drawable="@drawable/image41"
    android:duration="50"/>
<item
    android:drawable="@drawable/image42"
    android:duration="50"/>
<item
    android:drawable="@drawable/image43"
    android:duration="50"/>
<item
    android:drawable="@drawable/image44"
    android:duration="50"/>
<item
    android:drawable="@drawable/image45"
    android:duration="50"/>
<item
    android:drawable="@drawable/image46"
    android:duration="50"/>
<item
    android:drawable="@drawable/image47"
    android:duration="50"/>
<item
    android:drawable="@drawable/image48"
    android:duration="50"/>
<item
    android:drawable="@drawable/image49"
    android:duration="50"/>
<item
    android:drawable="@drawable/image50"
    android:duration="50"/>
<item
    android:drawable="@drawable/image51"
    android:duration="50"/>
<item
    android:drawable="@drawable/image52"
    android:duration="50"/>
<item
    android:drawable="@drawable/image53"
    android:duration="50"/>
<item
    android:drawable="@drawable/image54"
    android:duration="50"/>
<item
    android:drawable="@drawable/image55"
    android:duration="50"/>
<item
    android:drawable="@drawable/image56"
    android:duration="50"/>

Dog_Animation.java

public class Dog_Animation extends Activity {

Timer timer = new Timer();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);
    setContentView(R.layout.dog_animation);

    ImageView img = (ImageView) findViewById(R.id.dog_animation);
    img.setBackgroundResource(R.drawable.dog_animation);
    AnimationDrawable frameAnimation = (AnimationDrawable) img
            .getBackground();
    frameAnimation.start();

    timer.schedule(new TimerTask() {
        public void run() {
            Intent intent = new Intent(Dog_Animation.this,
                    Man_Animation.class);
            startActivity(intent);
        }
    }, 10000);
}
}

现在的问题是,当我尝试从一个活动移动到另一个活动时,它有相同的其他图像来动画它给我的错误java.lang.OutOfMemory.

我尝试过这么多不同的解决方案

@Override
protected void onDestroy() {
    super.onDestroy();

    unbindDrawables(findViewById(R.id.DogView));
    System.gc();
}

private void unbindDrawables(View view) {
    if (view.getBackground() != null) {
        view.getBackground().setCallback(null);
    }
    if (view instanceof ViewGroup) {
        for (int i = 0; i < ((ViewGroup) view).getChildCount(); i++) {
            unbindDrawables(((ViewGroup) view).getChildAt(i));
        }
        ((ViewGroup) view).removeAllViews();
    }
}

所以其他的,但任何解决方案都不适合我.请帮我解决这个问题.甚至我已经提到http://androidactivity.wordpress.com/2011/09/24/solution-for-outofmemoryerror-bitmap-size-exceeds-vm-budget/这个链接但没有解决问题.

Answer 1

在你的AndroidManifest.xml中保留这个内部应用程序标记,添加如下的largeHeap:

<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:largeHeap="true"/>

Answer 2

代替：

img.setBackgroundResource(R.drawable.dog_animation);

经过：

img.setImageBitmap(decodeSampleBitmapFromResource(R.drawable.dog_animation, width, height));
//dont forget to replace width and heigh by your imageview dimension

补充一句：

public static int calculateInSampleSize(
            BitmapFactory.Options options, int reqWidth, int reqHeight) {

    final int height = options.outHeight;
    final int width = options.outWidth;
    int inSampleSize = 1;

    if (height > reqHeight || width > reqWidth) {

        final int heightRatio = Math.round((float) height / (float) reqHeight);
        final int widthRatio = Math.round((float) width / (float) reqWidth);

        inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
    }

    return inSampleSize;
}

和

public static Bitmap decodeSampledBitmapFromResource(Resources res, int resId,
        int reqWidth, int reqHeight) {

    final BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeResource(res, resId, options);

    options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);

    options.inJustDecodeBounds = false;
    return BitmapFactory.decodeResource(res, resId, options);
}

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