android - 异步任务内存不足错误 : bitmap size exceeds VM budget

Question

必须将所有 SD 卡图像加载到交错 View 中。当我将计数设置为 100 时，它显示交错 View 中的图像，但对于许多没有图像(例如 700/800)我使用 AsyncTask 但它显示 doinbackground 错误请帮助我来解决这个问题。

import android.content.Context;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.os.AsyncTask;
import android.os.Bundle;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity
 {
  private StaggeredGridLayoutManager staggeredGridLayoutManager;
  MyAdapter myAdapter;
  List<ItemData> grid_view_item = new ArrayList<>();
   @Override
   protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
    recyclerView.setHasFixedSize(true);

 staggeredGridLayoutManager = new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL);
 recyclerView.setLayoutManager(staggeredGridLayoutManager);
            //call the LoadImage
            new LoadImage().execute();
            myAdapter = new MyAdapter(MainActivity.this, grid_view_item);
            recyclerView.setAdapter(myAdapter);

       }

这是 AsncTask 类。

class LoadImage extends AsyncTask<Void,Void,Void>
        {
            private int count;
            private Bitmap[] thumbnails;
            private boolean[] thumbnailsselection;
            private String[] arrPath;

            @Override
            protected Void doInBackground(Void... params)
            {
                //load gallery iamges
                final String[] columns = {MediaStore.Images.Media.DATA, MediaStore.Images.Media._ID};
                final String orderBy = MediaStore.Images.Media._ID;
                Cursor imagecursor = managedQuery(
                        MediaStore.Images.Media.EXTERNAL_CONTENT_URI, columns, null,
                        null, orderBy);
                int image_column_index = imagecursor.getColumnIndex(MediaStore.Images.Media._ID);
                Log.e("COUNT ", "" + image_column_index);
                this.count = imagecursor.getCount();
                Log.e("COUNT ", "" + count);
                this.thumbnails = new Bitmap[this.count];
                Log.e("COUNT ", "" + thumbnails);
                this.arrPath = new String[this.count];
                Log.e("COUNT ", "" + arrPath);
                this.thumbnailsselection = new boolean[this.count];
                Log.e("COUNT ", "" + thumbnailsselection);
                for (int i = 0; i < this.count; i++) {
                    imagecursor.moveToPosition(i);
                    int id = imagecursor.getInt(image_column_index);
                    int dataColumnIndex = imagecursor.getColumnIndex(MediaStore.Images.Media.DATA);
                    thumbnails[i] = MediaStore.Images.Thumbnails.getThumbnail(
                            getApplicationContext().getContentResolver(), id,
                            MediaStore.Images.Thumbnails.MINI_KIND, null);
                    arrPath[i] = imagecursor.getString(dataColumnIndex);
                    grid_view_item.add(new ItemData(thumbnails[i]));
                }

                return null;
            }
        }

这是适配器类。

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder>
{
            private List<ItemData> itemsData;
            private Context context;

    public MyAdapter(Context context, List<ItemData> itemsData)
    {
                this.itemsData = itemsData;
                this.context = context;
    }

    @Override
            public int getItemCount() {
                return this.itemsData.size();
            }

            @Override
            public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,
                                                           int viewType) {
                // create a new view
                View itemLayoutView = LayoutInflater.from(parent.getContext())
                        .inflate(R.layout.staggered_view_image, null);

                // create ViewHolder

                ViewHolder viewHolder = new ViewHolder(itemLayoutView);
                return viewHolder;
            }

            // Replace the contents of a view (invoked by the layout manager)
            @Override
            public void onBindViewHolder(ViewHolder viewHolder, final int position) {

                viewHolder.img.setImageBitmap(itemsData.get(position).getImage());

            }


            // inner class to hold a reference to each item of RecyclerView
            public class ViewHolder extends RecyclerView.ViewHolder {
                public ImageView img;

                public ViewHolder(View itemLayoutView) {
                    super(itemLayoutView);
                    img = (ImageView) itemLayoutView.findViewById(R.id.gallery_photo);
                }
            }
}
}

LogCat.

1
12-30 08:49:50.329 2902-2935/com.staggeredgridview E/COUNT: 775
12-30 08:49:50.329 2902-2935/com.staggeredgridview E/COUNT: [Landroid.graphics.Bitmap;@40513478
12-30 08:49:50.329 2902-2935/com.staggeredgridview E/COUNT: [Ljava.lang.String;@405187f8
12-30 08:49:50.329 2902-2935/com.staggeredgridview E/COUNT: [Z@4053aa88
12-30 08:50:24.319 2902-2935/com.staggeredgridview E/dalvikvm-heap: 153600-byte external allocation too large for this process.
12-30 08:50:24.369 2902-2935/com.staggeredgridview E/GraphicsJNI: VM won't let us allocate 153600 bytes
12-30 08:50:24.369 2902-2935/com.staggeredgridview D/skia: libjpeg error 105 <  Ss=%d, Se=%d, Ah=%d, Al=%d> from allocPixelRef [320 240]
12-30 08:50:24.369 2902-2935/com.staggeredgridview D/skia: --- decoder->decode returned false
12-30 08:50:24.369 2902-2935/com.staggeredgridview E/MediaStore: failed to allocate memory for thumbnail content://media/external/images/thumbnails/615; java.lang.OutOfMemoryError: bitmap size exceeds VM budget
12-30 08:50:24.539 2902-2935/com.staggeredgridview E/dalvikvm-heap: 153600-byte external allocation too large for this process.
12-30 08:50:24.589 2902-2935/com.staggeredgridview E/GraphicsJNI: VM won't let us allocate 153600 bytes
12-30 08:50:24.589 2902-2935/com.staggeredgridview D/skia: libjpeg error 105 <  Ss=%d, Se=%d, Ah=%d, Al=%d> from allocPixelRef [320 240]
12-30 08:50:24.589 2902-2935/com.staggeredgridview D/skia: --- decoder->decode returned false
12-30 08:50:24.589 2902-2935/com.staggeredgridview E/MediaStore: failed to allocate memory for thumbnail content://media/external/images/thumbnails/615; java.lang.OutOfMemoryError: bitmap size exceeds VM budget
12-30 08:50:24.599 2902-2935/com.staggeredgridview V/MediaStore: Create the thumbnail in memory: origId=639, kind=1, isVideo=false
12-30 08:50:24.749 2902-2935/com.staggeredgridview E/dalvikvm-heap: 307200-byte external allocation too large for this process.
12-30 08:50:24.799 2902-2935/com.staggeredgridview E/GraphicsJNI: VM won't let us allocate 307200 bytes
12-30 08:50:24.799 2902-2935/com.staggeredgridview D/skia: libjpeg error 105 <  Ss=%d, Se=%d, Ah=%d, Al=%d> from allocPixelRef [320 240]
12-30 08:50:24.799 2902-2935/com.staggeredgridview D/skia: --- decoder->decode returned false
12-30 08:50:24.809 2902-2935/com.staggeredgridview W/dalvikvm: threadid=9: thread exiting with uncaught exception (group=0x40018578)
12-30 08:50:24.829 2902-2935/com.staggeredgridview E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
12-30 08:50:24.829 2902-2935/com.staggeredgridview E/AndroidRuntime: java.lang.RuntimeException: An error occured while executing doInBackground()
12-30 08:50:24.829 2902-2935/com.staggeredgridview E/AndroidRuntime:     at android.os.AsyncTask$3.done(AsyncTask.java:200)
12-30 08:50:24.829 2902-2935/com.staggeredgridview E/AndroidRuntime:     at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274)
12-30 08:50:24.829 2902-2935/com.staggeredgridview E/AndroidRuntime:     at java.util.concurrent.FutureTask.setException(FutureTask.java:125)
12-30 08:50:24.829 2902-2935/com.staggeredgridview E/AndroidRuntime:     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308)
12-30 08:50:24.829 2902-2935/com.staggeredgridview E/AndroidRuntime:     at java.util.concurrent.FutureTask.run(FutureTask.java:138)
12-30 08:50:24.829 2902-2935/com.staggeredgridview E/AndroidRuntime:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
12-30 08:50:24.829 2902-2935/com.staggeredgridview E/AndroidRuntime:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
12-30 08:50:24.829 2902-2935/com.staggeredgridview E/AndroidRuntime:     at java.lang.Thread.run(Thread.java:1019)
12-30 08:50:24.829 2902-2935/com.staggeredgridview E/AndroidRuntime:  Caused by: java.lang.OutOfMemoryError: bitmap size exceeds VM budget
12-30 08:50:24.829 2902-2935/com.staggeredgridview E/AndroidRuntime:     at android.graphics.BitmapFactory.nativeDecodeByteArray(Native Method)
12-30 08:50:24.829 2902-2935/com.staggeredgridview E/AndroidRuntime:     at android.graphics.BitmapFactory.decodeByteArray(BitmapFactory.java:508)
12-30 08:50:24.829 2902-2935/com.staggeredgridview E/AndroidRuntime:     at android.media.ThumbnailUtils.createThumbnailFromEXIF(ThumbnailUtils.java:489)
12-30 08:50:24.829 2902-2935/com.staggeredgridview E/AndroidRuntime:     at android.media.ThumbnailUtils.createImageThumbnail(ThumbnailUtils.java:102)
12-30 08:50:24.829 2902-2935/com.staggeredgridview E/AndroidRuntime:     at android.provider.MediaStore$InternalThumbnails.getThumbnail(MediaStore.java:455)
12-30 08:50:24.829 2902-2935/com.staggeredgridview E/AndroidRuntime:     at android.provider.MediaStore$Images$Thumbnails.getThumbnail(MediaStore.java:791)
12-30 08:50:24.829 2902-2935/com.staggeredgridview E/AndroidRuntime:     at com.staggeredgridview.MainActivity$LoadImage.doInBackground(MainActivity.java:73)
12-30 08:50:24.829 2902-2935/com.staggeredgridview E/AndroidRuntime:     at com.staggeredgridview.MainActivity$LoadImage.doInBackground(MainActivity.java:42)
12-30 08:50:24.829 2902-2935/com.staggeredgridview E/AndroidRuntime:     at android.os.AsyncTask$2.call(AsyncTask.java:185)
12-30 08:50:24.829 2902-2935/com.staggeredgridview E/AndroidRuntime:     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
12-30 08:50:24.829 2902-2935/com.staggeredgridview E/AndroidRuntime:     at java.util.concurrent.FutureTask.run(FutureTask.java:138) 
12-30 08:50:24.829 2902-2935/com.staggeredgridview E/AndroidRuntime:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088) 
12-30 08:50:24.829 2902-2935/com.staggeredgridview E/AndroidRuntime:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581) 
12-30 08:50:24.829 2902-2935/com.staggeredgridview E/AndroidRuntime:     at java.lang.Thread.run(Thread.java:1019) 

Answer 1

正如我评论的那样，您收到错误是因为 android 系统在为应用程序提供内存方面存在一些限制。如果您想要比分配的内存更多的内存，请在 list 文件中将 largeHeap 设置为 true。这样操作系统将根据需要分配更多内存。但这并不总是最佳做法。如果无论如何都可以减少内存消耗，那是最好的选择。或者它会杀死在后台运行的其他应用程序。所以你的 list 将如下所示

    <application
            android:icon="@mipmap/ic_launcher"
            android:largeHeap="true"
            android:theme="@style/AppTheme" >
            <activity
              .....
              ....../>
              ....
              ...
<application/>