2

すべてのSDカード画像をスタガードビューにロードする必要があります。カウントを100に設定すると、画像がスタガードビューに表示されますが、多くの画像（例：700/800）ではAsyncTaskを使用していますが、doinbackgroundエラーが表示されますアウトするのを手伝ってくださいこれ。

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);

       }

これは AsncTask クラスです。

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;
            }
        }

これはアダプタークラスです。

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) 
4

2 に答える 2

1

私がコメントしたように、Android システムにはアプリケーションにメモリを提供するための制限があるため、エラーが発生しています。マニフェストファイルで設定largeHeapした割り当てよりも多くのメモリが必要な場合 。trueそのため、OS は必要に応じてより多くのメモリを割り当てます。ただし、これは常にベスト プラクティスとは限りません。とにかくメモリ消費を減らすことができれば、それが最善の選択肢です。または、バックグラウンドで実行されている他のアプリケーションを強制終了します。したがって、マニフェストは次のようになります

    <application
            android:icon="@mipmap/ic_launcher"
            android:largeHeap="true"
            android:theme="@style/AppTheme" >
            <activity
              .....
              ....../>
              ....
              ...
<application/>
于 2016-01-03T12:55:58.607 に答える
0

この問題を解決するために、Application タグの Android マニフェスト ファイルに追加android:largeHeap="true"しました。問題は解決しますが、アプリケーションにはより多くのヒープ メモリが必要です。他のアプリケーションに影響を与える可能性があり、2 番目に画像の読み込みに時間がかかる可能性があります。

これは Android マニフェスト ファイルです

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.staggeredgridview" >
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:largeHeap="true"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name"
            android:theme="@style/AppTheme.NoActionBar" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

これが最終的なコードです..正常に動作します..

import android.content.Context;
import android.database.Cursor;
import android.graphics.Bitmap;
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 int count;
    private Bitmap[] thumbnails;
    private boolean[] thumbnailsselection;
    private String[] arrPath;
    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(3, StaggeredGridLayoutManager.VERTICAL);
        recyclerView.setLayoutManager(staggeredGridLayoutManager);
        myAdapter = new MyAdapter(MainActivity.this, grid_view_item);
        recyclerView.setAdapter(myAdapter);


        //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]));
        }
    }

    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);
            }
        }
    }
}
于 2015-12-30T09:05:27.437 に答える