Question

我使用Listview / customcursoradapter创建了一个食谱列表。自定义布局包含配方的照片，现在我在查看和滚动ListView时遇到了一些问题，尽管它只有10条记录（目标是150）。有时我会收到此错误java.lang.OutOfMemoryError: bitmap size exceeds VM budget，我已尝试实施AsyncTask，但我没有做到。有什么办法可以解决这个问题吗？

非常感谢您的帮助!!

这是我的getView方法

public View getView(int position, View convertView, ViewGroup parent) {
    View row = super.getView(position, convertView, parent);
    Cursor cursbbn  = getCursor();
    if (row == null)
    {
        LayoutInflater inflater = (LayoutInflater) localContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        row = inflater.inflate(R.layout.listtype, null);
    }

    String Title = cursbbn.getString(2);
    String SandID=cursbbn.getString(1);
    String Readyin = cursbbn.getString(4);
    String Faovoites=cursbbn.getString(8);

    TextView titler=(TextView)row.findViewById(R.id.listmaintitle);
    TextView readyinr=(TextView)row.findViewById(R.id.listreadyin);

    int colorPos = position % colors.length;
    row.setBackgroundColor(colors[colorPos]);

    titler.setText(Title);
    readyinr.setText(Readyin);

    ImageView picture = (ImageView) row.findViewById(R.id.imageView1);

    Bitmap bitImg1 = BitmapFactory.decodeResource(localContext.getResources(), R.drawable.rec0001);
    Bitmap bitImg2 = BitmapFactory.decodeResource(localContext.getResources(), R.drawable.rec0002);
    Bitmap bitImg3 = BitmapFactory.decodeResource(localContext.getResources(), R.drawable.rec0003);
    Bitmap bitImg4 = BitmapFactory.decodeResource(localContext.getResources(), R.drawable.rec0004);
    Bitmap bitImg5 = BitmapFactory.decodeResource(localContext.getResources(), R.drawable.rec0005);
    Bitmap bitImg6 = BitmapFactory.decodeResource(localContext.getResources(), R.drawable.rec0006);
    Bitmap bitImg7 = BitmapFactory.decodeResource(localContext.getResources(), R.drawable.rec0007);
    Bitmap bitImg8 = BitmapFactory.decodeResource(localContext.getResources(), R.drawable.rec0008);
    Bitmap bitImg9 = BitmapFactory.decodeResource(localContext.getResources(), R.drawable.rec0009);
    Bitmap bitImg10 = BitmapFactory.decodeResource(localContext.getResources(), R.drawable.rec0010);

    if(SandID.contentEquals("0001"))
        picture.setImageBitmap(getRoundedCornerImage(bitImg1));

    if(SandID.contentEquals("0002"))
        picture.setImageBitmap(getRoundedCornerImage(bitImg2));

    if(SandID.contentEquals("0003"))
        picture.setImageBitmap(getRoundedCornerImage(bitImg3));

    if(SandID.contentEquals("0004"))
        picture.setImageBitmap(getRoundedCornerImage(bitImg4));

    if(SandID.contentEquals("0005"))
        picture.setImageBitmap(getRoundedCornerImage(bitImg5));

    if(SandID.contentEquals("0006"))
        picture.setImageBitmap(getRoundedCornerImage(bitImg6));
    if(SandID.contentEquals("0007"))
        picture.setImageBitmap(getRoundedCornerImage(bitImg7));
    if(SandID.contentEquals("0008"))
        picture.setImageBitmap(getRoundedCornerImage(bitImg8));
    if(SandID.contentEquals("0009"))
        picture.setImageBitmap(getRoundedCornerImage(bitImg9));

    if(SandID.contentEquals("0010"))
        picture.setImageBitmap(getRoundedCornerImage(bitImg10));

    return row;
}

这是错误：

05-02 03:11:55.898: E/AndroidRuntime(376): FATAL EXCEPTION: main
05-02 03:11:55.898: E/AndroidRuntime(376): java.lang.OutOfMemoryError: bitmap size exceeds VM budget
05-02 03:11:55.898: E/AndroidRuntime(376):  at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method)
05-02 03:11:55.898: E/AndroidRuntime(376):  at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:460)
05-02 03:11:55.898: E/AndroidRuntime(376):  at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:336)
05-02 03:11:55.898: E/AndroidRuntime(376):  at android.graphics.BitmapFactory.decodeResource(BitmapFactory.java:359)
05-02 03:11:55.898: E/AndroidRuntime(376):  at android.graphics.BitmapFactory.decodeResource(BitmapFactory.java:385)
05-02 03:11:55.898: E/AndroidRuntime(376):  at master.chef.mediamaster.AlternateRowCursorAdapter.getView(AlternateRowCursorAdapter.java:83)
05-02 03:11:55.898: E/AndroidRuntime(376):  at android.widget.AbsListView.obtainView(AbsListView.java:1409)
05-02 03:11:55.898: E/AndroidRuntime(376):  at android.widget.ListView.makeAndAddView(ListView.java:1745)
05-02 03:11:55.898: E/AndroidRuntime(376):  at android.widget.ListView.fillUp(ListView.java:700)
05-02 03:11:55.898: E/AndroidRuntime(376):  at android.widget.ListView.fillGap(ListView.java:646)
05-02 03:11:55.898: E/AndroidRuntime(376):  at android.widget.AbsListView.trackMotionScroll(AbsListView.java:3399)
05-02 03:11:55.898: E/AndroidRuntime(376):  at android.widget.AbsListView.onTouchEvent(AbsListView.java:2233)
05-02 03:11:55.898: E/AndroidRuntime(376):  at android.widget.ListView.onTouchEvent(ListView.java:3446)
05-02 03:11:55.898: E/AndroidRuntime(376):  at android.view.View.dispatchTouchEvent(View.java:3885)
05-02 03:11:55.898: E/AndroidRuntime(376):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:903)
05-02 03:11:55.898: E/AndroidRuntime(376):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
05-02 03:11:55.898: E/AndroidRuntime(376):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
05-02 03:11:55.898: E/AndroidRuntime(376):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
05-02 03:11:55.898: E/AndroidRuntime(376):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
05-02 03:11:55.898: E/AndroidRuntime(376):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
05-02 03:11:55.898: E/AndroidRuntime(376):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
05-02 03:11:55.898: E/AndroidRuntime(376):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
05-02 03:11:55.898: E/AndroidRuntime(376):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
05-02 03:11:55.898: E/AndroidRuntime(376):  at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1691)
05-02 03:11:55.898: E/AndroidRuntime(376):  at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1125)
05-02 03:11:55.898: E/AndroidRuntime(376):  at android.app.Activity.dispatchTouchEvent(Activity.java:2096)
05-02 03:11:55.898: E/AndroidRuntime(376):  at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1675)
05-02 03:11:55.898: E/AndroidRuntime(376):  at android.view.ViewRoot.deliverPointerEvent(ViewRoot.java:2194)
05-02 03:11:55.898: E/AndroidRuntime(376):  at android.view.ViewRoot.handleMessage(ViewRoot.java:1878)
05-02 03:11:55.898: E/AndroidRuntime(376):  at android.os.Handler.dispatchMessage(Handler.java:99)
05-02 03:11:55.898: E/AndroidRuntime(376):  at android.os.Looper.loop(Looper.java:123)
05-02 03:11:55.898: E/AndroidRuntime(376):  at android.app.ActivityThread.main(ActivityThread.java:3683)
05-02 03:11:55.898: E/AndroidRuntime(376):  at java.lang.reflect.Method.invokeNative(Native Method)
05-02 03:11:55.898: E/AndroidRuntime(376):  at java.lang.reflect.Method.invoke(Method.java:507)
05-02 03:11:55.898: E/AndroidRuntime(376):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
05-02 03:11:55.898: E/AndroidRuntime(376):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
05-02 03:11:55.898: E/AndroidRuntime(376):  at dalvik.system.NativeStart.main(Native Method)

Answer 1

首先，你没有使用convertView，你应该这样开始，

View view = convertView;
if (view == null) {
  // inflate
}

这是一篇关于使用convertView的博客文章，

http://android-er.blogspot.com/2010/06/using-convertview-in-getview-to-make.html

其次，您应该只解码您将使用的位图。所以改变你的方法，

if(SandID.contentEquals("0001"))
    Bitmap bitImg1 = BitmapFactory.decodeResource(localContext.getResources(), R.drawable.rec0001);
    picture.setImageBitmap(getRoundedCornerImage(bitImg1));
...

第三，你可以解码一次，并在这种方法之外使用吗？例如，在构造函数中对它们进行一次解码，并将它们作为实例成员存储在适配器类中，然后在getView()中使用它们。

第四，你在回收你的位图吗？位图的分配方式与其他对象的分配方式不同，并且在完成使用后需要调用它们的recycle()方法。如果你可以实现上面的第三项，你可以在大多数情况下避免这种复杂性，虽然你应该在你的活动停止时释放它们，在它们开始时重新分配它们。

关于Bitmap.recycle()的SO有很多很好的信息，我建议你花点时间研究它。解释错综复杂的内容超出了这里的帖子所能完成的内容。这是一篇很好的SO帖子，涵盖了这个主题，

Bitmap, Bitmap.recycle(), WeakReferences, and Garbage Collection

ListView性能缓慢

1 个答案: