位图工厂和 ListAdapter 中的视图出现 OutOfMemory 错误

Question

我的代码遇到错误，java.lang.OutOfMemory at

xxx.adapter.FeedListAdapter.getImageBitmap(FeedListAdapter.java) 和 xxx.adapter.FeedListAdapter.getView(FeedListAdapter.java) 用于代码中的以下行：

mholder.imgImageView.setImageBitmap(getImageBitMap(mfeeds.getImageByte()));
return (_imagebyte==null?null:BitmapFactory.decodeByteArray(_imagebyte, 0, _imagebyte.length));

带有行的整个类遇到错误：

public class FeedsListAdapter extends BaseAdapter {
private Context mContext;
private List<SportFeed> mFeedsModels;

public FeedsListAdapter(Context context,List<SportFeed> list) {
    this.mContext = context;
    this.mFeedsModels = list;
}

private class ViewHolder{
    FrameLayout imgLayout;
    ImageView imgImageView;
    TextView txtTitle;
    TextView txtDesc; 
    TextView txtDateTime;
    LinearLayout ly_content;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    ViewHolder mholder = null;
    LayoutInflater minflater = (LayoutInflater)mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    if(convertView == null){ 
        convertView = minflater.inflate(R.layout.feeds_listing_row, null);
        mholder = new ViewHolder();
        mholder.ly_content = (LinearLayout)convertView.findViewById(R.id.flr_content_layout);
        mholder.imgLayout = (FrameLayout)convertView.findViewById(R.id.flr_img_layout);
        mholder.imgImageView = (ImageView)convertView.findViewById(R.id.flr_img);
        mholder.txtTitle = (TextView)convertView.findViewById(R.id.flr_textTitle);
        mholder.txtDesc = (TextView)convertView.findViewById(R.id.flr_desc);
        mholder.txtDateTime = (TextView)convertView.findViewById(R.id.flr_datetime);

    }else{
        mholder = (ViewHolder)convertView.getTag();
    }

    SportFeed mfeeds = (SportFeed)getItem(position);
    mholder.txtTitle.setText(mfeeds.getTitle());
    String shortDesc = mfeeds.getContentString();
    mholder.txtDesc.setText((shortDesc.length()>0?mfeeds.getContentString():""));
    RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams)mholder.ly_content.getLayoutParams();
    if(mfeeds.getImageUrl().trim().equals("")){
        mholder.imgLayout.setVisibility(View.GONE);
        params.addRule(RelativeLayout.ALIGN_PARENT_LEFT, RelativeLayout.TRUE);
    }else{
        mholder.imgLayout.setVisibility(View.VISIBLE);
---->   mholder.imgImageView.setImageBitmap(getImageBitMap(mfeeds.getImageByte())); //this line hits error
        params.addRule(RelativeLayout.ALIGN_PARENT_LEFT, 0);
    }
    mholder.txtDateTime.setText(StringUtils.postDateStringConverter(mContext,mfeeds.getPostDate()));
    return convertView;
}

private Bitmap getImageBitMap(byte[] _imagebyte){

----> return (_imagebyte==null?null:BitmapFactory.decodeByteArray(_imagebyte, 0, _imagebyte.length)); //this line hits error
}

LogCat：

08-14 03:00:40.384: E/AndroidRuntime(1506): FATAL EXCEPTION: main
08-14 03:00:40.384: E/AndroidRuntime(1506): Process: org.diebao.rbbb, PID: 1506
08-14 03:00:40.384: E/AndroidRuntime(1506): java.lang.OutOfMemoryError
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.graphics.BitmapFactory.nativeDecodeByteArray(Native Method)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.graphics.BitmapFactory.decodeByteArray(BitmapFactory.java:500)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.graphics.BitmapFactory.decodeByteArray(BitmapFactory.java:523)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at org.diebao.rbbb.adapter.FeedsListAdapter.getImageBitMap(FeedsListAdapter.java:84)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at org.diebao.rbbb.adapter.FeedsListAdapter.getView(FeedsListAdapter.java:74)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.widget.AbsListView.obtainView(AbsListView.java:2240)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.widget.ListView.measureHeightOfChildren(ListView.java:1263)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.widget.ListView.onMeasure(ListView.java:1175)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.view.View.measure(View.java:16497)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)            
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.widget.LinearLayout.onMeasure(LinearLayout.java:588) 
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.view.View.measure(View.java:16497)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:719)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:455)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.view.View.measure(View.java:16497)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.view.View.measure(View.java:16497)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at com.android.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:327)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.view.View.measure(View.java:16497)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2291)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.view.View.measure(View.java:16497)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1916)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1113)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1295)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1000)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5670)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.view.Choreographer.doCallbacks(Choreographer.java:574)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.view.Choreographer.doFrame(Choreographer.java:544)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.os.Handler.handleCallback(Handler.java:733)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.os.Handler.dispatchMessage(Handler.java:95)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.os.Looper.loop(Looper.java:136)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at android.app.ActivityThread.main(ActivityThread.java:5017)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at java.lang.reflect.Method.invokeNative(Native Method)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at java.lang.reflect.Method.invoke(Method.java:515)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
08-14 03:00:40.384: E/AndroidRuntime(1506):     at dalvik.system.NativeStart.main(Native Method)
08-14 03:00:40.574: W/ActivityManager(383):   Force finishing activity org.diebao.rbbb/.activity.FeedListing
08-14 03:00:40.614: W/ActivityManager(383):   Force finishing activity org.diebao.rbbb/.activity.CategoryListing

注意：我已经搜索过类似的问题，但我找不到一个非常相似或非常接近的问题。因此，功能实现没有错，因为它适用于许多设备没有问题，只是某些Android设备遇到了错误。也许我需要更改编码的某些部分以使其流畅并使应用程序广泛可靠。

感谢您的帮助。

Answer 1

位图处理在 Android 中并非易事。不可能指向一行代码并告诉您只需更改它即可。有很多方面需要注意。

Android 文档很好地概述了需要考虑的事项。有几点是：

• Bitmap Caching with LRU cache
• Load and display bitmpas downscaled
• Manage Bitmap Memory

使用android:largeHeap is really discouraged 的提示，因为它是一种黑客行为，除了最极端的情况外，几乎在所有情况下都被认为是不好的做法。通常你应该对你的应用程序的内存效率进行编码，而不是仅仅使用更多的内存。

对于大多数此类问题的简单实施，我建议查看Picasso，它会为您处理加载、缩减和缓存，只需一行代码。