android - 内存不足错误 ImageView 问题

Question

我是 Android 编程新手，我收到一条错误消息，提示我的应用程序内存不足，这个示例是我从一本书中复制的，它使用的是小图片分辨率，但是当我添加了几张带有出现更大的分辨率内存不足错误，可能是我做错了什么或者只是不知道我应该使用图像的所有内容，如果有人知道我应该更改什么以便不会再次出现此错误，请帮助。谢谢期待!

源代码:

public class ImageViewsActivity extends Activity {
//the images to display
Integer[] imageIDs={
        R.drawable.pic1,
        R.drawable.pic2,
        R.drawable.pic3,
        R.drawable.pic4,
        R.drawable.pic5
};  
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    final ImageView iv=(ImageView) findViewById(R.id.image1);

    Gallery gallery=(Gallery) findViewById(R.id.gallery);
    gallery.setAdapter(new ImageAdapter(this));
  gallery.setOnItemClickListener(new OnItemClickListener(){
        public void onItemClick(AdapterView<?> parent, View v, int position, long id){
            Toast.makeText(getBaseContext(), "pic"+(position+1)+" selected", Toast.LENGTH_SHORT).show();

            //display the image selected
            try{iv.setScaleType(ImageView.ScaleType.FIT_CENTER);
              iv.setImageResource(imageIDs[position]);}catch(OutOfMemoryError e){
                     iv.setImageBitmap(null);
                }
        }
    });


}

public class ImageAdapter extends BaseAdapter{
    private Context context;
    private int itemBackground;

    public ImageAdapter(Context c){
        context=c;
        //setting the style
        TypedArray a = obtainStyledAttributes(R.styleable.Gallery1);
        itemBackground = a.getResourceId(R.styleable.Gallery1_android_galleryItemBackground, 0);
        a.recycle();
    }

    //returns the number of images
    public int getCount() {
        // TODO Auto-generated method stub
        return imageIDs.length;
    }

    //returns the ID of an item
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    //returns the ID of an item
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    //returns an ImageView view
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        ImageView iv= new ImageView(context);
        iv.setImageResource(imageIDs[position]);
        iv.setScaleType(ImageView.ScaleType.FIT_XY);
        iv.setLayoutParams(new Gallery.LayoutParams(150,120));
        iv.setBackgroundResource(itemBackground);

        return iv;
    }
}}

此处出现错误:

04-18 10:38:31.661: D/dalvikvm(10152): Debugger has detached; object registry had 442 entries
04-18 10:38:31.661: D/AndroidRuntime(10152): Shutting down VM
04-18 10:38:31.661: W/dalvikvm(10152): threadid=1: thread exiting with uncaught exception (group=0x4001d820)
04-18 10:38:31.691: E/AndroidRuntime(10152): FATAL EXCEPTION: main
04-18 10:38:31.691: E/AndroidRuntime(10152): java.lang.OutOfMemoryError: bitmap size exceeds VM budget
04-18 10:38:31.691: E/AndroidRuntime(10152):    at android.graphics.Bitmap.nativeCreate(Native Method)
04-18 10:38:31.691: E/AndroidRuntime(10152):    at android.graphics.Bitmap.createBitmap(Bitmap.java:499)
04-18 10:38:31.691: E/AndroidRuntime(10152):    at android.graphics.Bitmap.createBitmap(Bitmap.java:466)
04-18 10:38:31.691: E/AndroidRuntime(10152):    at android.graphics.Bitmap.createScaledBitmap(Bitmap.java:371)
04-18 10:38:31.691: E/AndroidRuntime(10152):    at android.graphics.BitmapFactory.finishDecode(BitmapFactory.java:539)
04-18 10:38:31.691: E/AndroidRuntime(10152):    at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:508)
04-18 10:38:31.691: E/AndroidRuntime(10152):    at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:365)
04-18 10:38:31.691: E/AndroidRuntime(10152):    at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:728)
04-18 10:38:31.691: E/AndroidRuntime(10152):    at android.content.res.Resources.loadDrawable(Resources.java:1740)
04-18 10:38:31.691: E/AndroidRuntime(10152):    at android.content.res.Resources.getDrawable(Resources.java:612)
04-18 10:38:31.691: E/AndroidRuntime(10152):    at android.widget.ImageView.resolveUri(ImageView.java:520)
04-18 10:38:31.691: E/AndroidRuntime(10152):    at android.widget.ImageView.setImageResource(ImageView.java:305)
04-18 10:38:31.691: E/AndroidRuntime(10152):    at image.view.GalleryView$ImageAdapter.getView(GalleryView.java:95)
04-18 10:38:31.691: E/AndroidRuntime(10152):    at android.widget.Gallery.makeAndAddView(Gallery.java:776)
04-18 10:38:31.691: E/AndroidRuntime(10152):    at android.widget.Gallery.fillToGalleryLeft(Gallery.java:695)
04-18 10:38:31.691: E/AndroidRuntime(10152):    at android.widget.Gallery.trackMotionScroll(Gallery.java:406)
04-18 10:38:31.691: E/AndroidRuntime(10152):    at android.widget.Gallery$FlingRunnable.run(Gallery.java:1397)
04-18 10:38:31.691: E/AndroidRuntime(10152):    at android.os.Handler.handleCallback(Handler.java:618)
04-18 10:38:31.691: E/AndroidRuntime(10152):    at android.os.Handler.dispatchMessage(Handler.java:123)
04-18 10:38:31.691: E/AndroidRuntime(10152):    at android.os.Looper.loop(Looper.java:154)
04-18 10:38:31.691: E/AndroidRuntime(10152):    at android.app.ActivityThread.main(ActivityThread.java:4668)
04-18 10:38:31.691: E/AndroidRuntime(10152):    at java.lang.reflect.Method.invokeNative(Native Method)
04-18 10:38:31.691: E/AndroidRuntime(10152):    at java.lang.reflect.Method.invoke(Method.java:552)
04-18 10:38:31.691: E/AndroidRuntime(10152):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:917)
04-18 10:38:31.691: E/AndroidRuntime(10152):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:674)
04-18 10:38:31.691: E/AndroidRuntime(10152):    at dalvik.system.NativeStart.main(Native Method)

Answer 1

要添加 Ken 的答案，这是一段可靠的代码，我想我会在他设置后将其击倒:

    if(imageView != null) {
        ((BitmapDrawable)imageView.getDrawable()).getBitmap().recycle();
    }
    imageView = (ImageView) view.findViewById(R.id.imageView);
    imageView.setImageResource(resID);

注意:如果您尝试交换已回收的图像，这将不起作用。你会在 LOGCAT 中得到类似的东西

Canvas: trying to use a recycled bitmap

所以如果我不必异步加载一堆不同的图像，我现在要做的就是在处理 fragment 和大背景图像时将它放在 onDestroy 中:

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

    imageView.setImageDrawable(null);
}