java.lang.OutOfMemoryError 在列表视图中

Question

我有一个listView和images的问题，当set images in a moment make me a java.lang.OutOfMemoryError，这是我在getview

中实现的ArrayAdapter

 @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        ViewHolder viewHolder; // view lookup cache stored in tag
        if(convertView == null) {
            viewHolder = new ViewHolder();
            LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = inflater.inflate(R.layout.category_list_item, parent, false);
            viewHolder.image = (ImageView) convertView.findViewById(R.id.Icon);
            viewHolder.name = (TextView) convertView.findViewById(R.id.nombreCategoriaTextView);
            viewHolder.name.setText(categories.getCategories(position).getName());
            try {
                DataBaseImageManager manager = new DataBaseImageManager(context);
                Bitmap mIcon11 = manager.getListByName(categories.getCategories(position).getURLImage());
                if (mIcon11 == null)
                    new DownloadImageTask(viewHolder.image, context)
                            .execute(categories.getCategories(position).getURLImage());
                else {
                    (viewHolder.image).setImageBitmap(mIcon11);
                }
            }catch (Exception e){}
            convertView.setTag(viewHolder);
        }else{
            viewHolder = (ViewHolder)convertView.getTag();
        }
        return convertView;
    }

我将我的图像放在 sqlIte 中，我从 ByteArray 解码了位图，接下来是实现

public Bitmap getListByName(String name) {
        Bitmap bmp = null;
        try {
            DataSource.open();
            List<DatosImage> datos = DataSource.obtenerRegistros(name);
            for (DatosImage dato : datos) {
                 bmp = BitmapFactory.decodeByteArray(dato.getValue(), 0, dato.getValue().length);
            }
            DataSource.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return bmp;
    }

哪个可以解决我的问题或者我的代码有什么问题？

the error is the nextFATAL EXCEPTION: main
11-07 12:31:24.490 19660-19660/? E/AndroidRuntime: Process: mx.com.sithec.cic, PID: 19660
11-07 12:31:24.490 19660-19660/? E/AndroidRuntime: java.lang.OutOfMemoryError
11-07 12:31:24.490 19660-19660/? E/AndroidRuntime:     at android.graphics.BitmapFactory.nativeDecodeByteArray(Native Method)
11-07 12:31:24.490 19660-19660/? E/AndroidRuntime:     at android.graphics.BitmapFactory.decodeByteArray(BitmapFactory.java:500)
11-07 12:31:24.490 19660-19660/? E/AndroidRuntime:     at android.graphics.BitmapFactory.decodeByteArray(BitmapFactory.java:523)
11-07 12:31:24.490 19660-19660/? E/AndroidRuntime:     at mx.com.sithec.cic.ImageHelper.DataBaseImageManager.getListByName(DataBaseImageManager.java:31)
11-07 12:31:24.490 19660-19660/? E/AndroidRuntime:     at mx.com.sithec.cic.Adapters.CompanyAdapter.getView(CompanyAdapter.java:102)
11-07 12:31:24.490 19660-19660/? E/AndroidRuntime:     at android.widget.AbsListView.obtainView(AbsListView.java:2283)
11-07 12:31:24.490 19660-19660/? E/AndroidRuntime:     at android.widget.ListView.makeAndAddView(ListView.java:1790)
11-07 12:31:24.490 19660-19660/? E/AndroidRuntime:     at android.widget.ListView.fillUp(ListView.java:725)
11-07 12:31:24.490 19660-19660/? E/AndroidRuntime:     at android.widget.ListView.fillGap(ListView.java:664)
11-07 12:31:24.490 19660-19660/? E/AndroidRuntime:     at android.widget.AbsListView.trackMotionScroll(AbsListView.java:5423)
11-07 12:31:24.490 19660-19660/? E/AndroidRuntime:     at android.widget.AbsListView$FlingRunnable.run(AbsListView.java:4534)
11-07 12:31:24.490 19660-19660/? E/AndroidRuntime:     at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
11-07 12:31:24.490 19660-19660/? E/AndroidRuntime:     at android.view.Choreographer.doCallbacks(Choreographer.java:574)
11-07 12:31:24.490 19660-19660/? E/AndroidRuntime:     at android.view.Choreographer.doFrame(Choreographer.java:543)
11-07 12:31:24.490 19660-19660/? E/AndroidRuntime:     at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
11-07 12:31:24.490 19660-19660/? E/AndroidRuntime:     at android.os.Handler.handleCallback(Handler.java:733)
11-07 12:31:24.490 19660-19660/? E/AndroidRuntime:     at android.os.Handler.dispatchMessage(Handler.java:95)
11-07 12:31:24.490 19660-19660/? E/AndroidRuntime:     at android.os.Looper.loop(Looper.java:136)
11-07 12:31:24.490 19660-19660/? E/AndroidRuntime:     at android.app.ActivityThread.main(ActivityThread.java:5070)
11-07 12:31:24.490 19660-19660/? E/AndroidRuntime:     at java.lang.reflect.Method.invokeNative(Native Method)
11-07 12:31:24.490 19660-19660/? E/AndroidRuntime:     at java.lang.reflect.Method.invoke(Method.java:515)
11-07 12:31:24.490 19660-19660/? E/AndroidRuntime:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
11-07 12:31:24.490 19660-19660/? E/AndroidRuntime:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605)
11-07 12:31:24.490 19660-19660/? E/AndroidRuntime:     at dalvik.system.NativeStart.main(Native Method)

Answer 1

getListByName() 中的 for 循环看起来很奇怪。您可能正在创建多个位图（如果您在单个运行中有多个位图，仅此一项就可能导致 OutOfMemoryError 异常）但只返回一个。

你可能应该做的是：

public Bitmap getListByName(String name) {
    try {
        DataSource.open();
        List<DatosImage> datos = DataSource.obtenerRegistros(name);
        for (DatosImage dato : datos) {
             Bitmap bmp = BitmapFactory.decodeByteArray(dato.getValue(), 0, dato.getValue().length);
             if (bmp != null) {
                 DataSource.close();
                 return bmp;
             }
        }
        DataSource.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

Answer 2

事实上，问题可能在于您正在为列表中的每一行创建 Bitmap 对象。这是非常耗内存的操作，尤其是当位图又大又多时。

我认为解决这个问题的最简单方法是简单地使用一个已经存在的库来处理这种情况（从 URL 加载图像到图像视图）。让我举几个例子

Picasso

非常好用，加进去就可以了build.gradle

compile 'com.squareup.picasso:picasso:2.5.2'

然后在您的代码中：

Picasso.with(context).load("http://i.imgur.com/DvpvklR.png").into(imageView);

如果您仍想将图像缓存在数据库中，您可以使用 Picasso：

Picasso.with(this).load("url").into(new Target()
{
    @Override
    public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from)
    {
        image.setImageBitmap(bitmap);
        //Code for DB save
    }
    @Override
    public void onBitmapFailed(Drawable errorDrawable)
    {
        image.setImageDrawable(errorDrawable);
    }
    @Override
    public void onPrepareLoad(Drawable placeHolderDrawable)
    {
        image.setImageDrawable(placeHolderDrawable);
    }
});

您可能还想看看 Fresco or Glide

java.lang.OutOfMemoryError 在列表视图中

java.lang.OutOfMemoryError In ListView

android

listview

bitmap

out-of-memory

android-arrayadapter

Picasso