android - 简单静态图库的内存不足异常

Question

我正在使用一个简单的静态图片库，我在其中加载了至少 28 张不同大小的图片，每张图片都在 150kb 以下。

我注意到这里有两个问题:

1) 慢速滚动 2) 当我去这个 Activity 两次三次时出现内存不足异常。

谁能指导我这里的问题是什么以及如何解决？

任何帮助将不胜感激

日志猫:

03-15 15:32:55.899: E/AndroidRuntime(14662): java.lang.OutOfMemoryError: bitmap size exceeds VM budget
03-15 15:32:55.899: E/AndroidRuntime(14662):    at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:563)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:439)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:697)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at android.content.res.Resources.loadDrawable(Resources.java:1709)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at android.content.res.Resources.getDrawable(Resources.java:581)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at android.widget.ImageView.resolveUri(ImageView.java:501)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at android.widget.ImageView.setImageResource(ImageView.java:280)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at com.tackfu.Art$ImageAdapter.getView(Art.java:84)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at android.widget.AbsListView.obtainView(AbsListView.java:1515)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at android.widget.GridView.makeAndAddView(GridView.java:1269)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at android.widget.GridView.makeRow(GridView.java:315)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at android.widget.GridView.fillDown(GridView.java:268)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at android.widget.GridView.fillGap(GridView.java:235)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at android.widget.AbsListView.trackMotionScroll(AbsListView.java:4063)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at android.widget.AbsListView.onTouchEvent(AbsListView.java:2471)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at android.view.View.dispatchTouchEvent(View.java:3885)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:903)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1750)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1135)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at android.app.Activity.dispatchTouchEvent(Activity.java:2096)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1734)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at android.view.ViewRoot.deliverPointerEvent(ViewRoot.java:2216)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at android.view.ViewRoot.handleMessage(ViewRoot.java:1887)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at android.os.Handler.dispatchMessage(Handler.java:99)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at android.os.Looper.loop(Looper.java:130)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at android.app.ActivityThread.main(ActivityThread.java:3687)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at java.lang.reflect.Method.invokeNative(Native Method)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at java.lang.reflect.Method.invoke(Method.java:507)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
03-15 15:32:55.899: E/AndroidRuntime(14662):    at dalvik.system.NativeStart.main(Native Method)

Activity 代码:

 @Override
        public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);
            setContentView(R.layout.art);

 GridView gridview = (GridView) findViewById(R.id.gridv
 gridview.setAdapter(new ImageAdapter(this));

}

 public class ImageAdapter extends BaseAdapter {
            private Context mContext;

            public ImageAdapter(Context c) {
                mContext = c;
            }

            public int getCount() {
                return mThumbIds.length;
            }

            public Object getItem(int position) {
                return null;
            }

            public long getItemId(int position) {
                return 0;
            }

            // create a new ImageView for each item referenced by the Adapter
            public View getView(int position, View convertView, ViewGroup parent) {
                ImageView imageView;
                if (convertView == null) {  // if it's not recycled, initialize some attributes
                    imageView = new ImageView(mContext);
                    imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
                    imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
                    imageView.setPadding(8, 8, 8, 8);
                } else {
                    imageView = (ImageView) convertView;
                }

                imageView.setImageResource(mThumbIds[position]);
                return imageView;
            }

            // references to our images
            private Integer[] mThumbIds = {
                    R.drawable.i1, R.drawable.i2,
                    R.drawable.i3, R.drawable.i4,
                    R.drawable.i5, R.drawable.i6,
                    R.drawable.i7, R.drawable.i8,
                    R.drawable.i9, R.drawable.i10,
                    R.drawable.i11, R.drawable.i12,
                    R.drawable.i13,R.drawable.i14,
                    R.drawable.i15,R.drawable.i16,
                    R.drawable.i17,R.drawable.i18,
                    R.drawable.i19,R.drawable.i20,
                    R.drawable.i21, R.drawable.i22,
                    R.drawable.i23, R.drawable.i24,
                    R.drawable.i26, R.drawable.i28,
                    R.drawable.i29, R.drawable.i30
            };
        }

Answer 1

不使用时回收位图。使用 view holder 以获得更好的性能。 http://www.youtube.com/watch?v=wDBM6wVEO70 .我建议你看看链接。适用于 listview 的任何内容也适用于 gridview，视频中对此进行了讨论。该视频还有一个关于 view holder 的演讲，这正是您应该用来避免内存泄漏的内容。

在 http://android-developers.blogspot.de/2009/01/avoiding-memory-leaks.html 也有关于避免内存泄漏的讨论。 .

http://developer.android.com/training/displaying-bitmaps/load-bitmap.html .请参阅将按比例缩小的版本加载到内存中

部分

使用 MAT 分析器检查内存泄漏。 http://www.youtube.com/watch?v=_CruQY55HOk .

请引用 http://developer.android.com/training/articles/perf-tips.html 中的一些提示.