Android: GridView 滚动时出现内存不足异常？

Question

我创建了一个 GridView 如下

    <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/content_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="application.example.com.fragment_practice.MainActivity"
    tools:showIn="@layout/app_bar_main">

    <GridView xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/image_grid_view"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:columnWidth="@dimen/grid_view_width"
        android:gravity="center"
        android:horizontalSpacing="10dp"
        android:numColumns="auto_fit"
        android:stretchMode="columnWidth"
        android:verticalSpacing="@dimen/dp_10" />
</RelativeLayout>

以下是我的MainActivity.javaclass

 public class MainActivity extends Activity {
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);

      GridView gridview = (GridView) findViewById(R.id.gridview);
      gridview.setAdapter(new ImageAdapter(this));
   }
}

以下是ImageAdapter.javaclass

   public class ImageAdapter extends BaseAdapter {
    private Context mContext;

    // Constructor
    public ImageAdapter(Context c) {
        mContext = c;
    }

    public int getCount() {
        return mThumbIds.length;
    }

    public Object getItem(int position) {
        return null;
    }

    public long getItemId(int position) {
        return 0;
    }

    // create a new ImageView for each item referenced by the Adapter
    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView imageView;

        if (convertView == null) {
            imageView = new ImageView(mContext);
            imageView.setLayoutParams(new GridView.LayoutParams(180, 180));
            imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
            imageView.setPadding(15, 15, 15, 15);
        }
        else
        {
            imageView = (ImageView) convertView;
        }
        imageView.setImageResource(mThumbIds[position]);
        return imageView;
    }

    // Keep all Images in array
    public Integer[] mThumbIds = {
            R.drawable.sample_1, R.drawable.sample_2,
            R.drawable.sample_3, R.drawable.sample_4,
            R.drawable.sample_5, R.drawable.sample_6,
            R.drawable.sample_7, R.drawable.sample_8,
            R.drawable.sample_13, R.drawable.sample_9,
            R.drawable.sample_10, R.drawable.sample_11,
            R.drawable.sample_12, R.drawable.sample_13,
            R.drawable.sample_14, R.drawable.sample_16,
            R.drawable.sample_16, R.drawable.sample_17,
            R.drawable.sample_18, R.drawable.sample_19,
            R.drawable.sample_20, R.drawable.sample_21,
            R.drawable.sample_22, R.drawable.sample_23
    };
}

在我滚动之前，一切都很完美。以下是我上下滚动 GridView 3-4 次的异常。

FATAL EXCEPTION: mai
Process: application.example.com.fragment_practice, PID: 18917 java.lang.OutOfMemoryError: Failed to allocate a 4915212 byte allocation with 2666656 free bytes and 2MB until OOM at dalvik.system.VMRuntime.newNonMovableArray(Native Method) at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method) at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:856) at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:675) at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:2230) at android.content.res.Resources.loadDrawableForCookie(Resources.java:4284) at android.content.res.Resources.loadDrawable(Resources.java:4158) at android.content.res.Resources.getDrawable(Resources.java:2043) at android.content.res.Resources.getDrawable(Resources.java:2025) at android.content.Context.getDrawable(Context.java:464) at android.widget.ImageView.resolveUri(ImageView.java:827) at android.widget.ImageView.setImageResource(ImageView.java:434) at application.example.com.fragment_practice.ImageAdapter.getView(ImageAdapter.java:48) at android.widget.AbsListView.obtainView(AbsListView.java:2937) at android.widget.GridView.makeAndAddView(GridView.java:1463) at android.widget.GridView.makeRow(GridView.java:366) at android.widget.GridView.fillUp(GridView.java:407) at android.widget.GridView.fillGap(GridView.java:282) at android.widget.AbsListView.trackMotionScroll(AbsListView.java:7307) at android.widget.AbsListView.scrollIfNeeded(AbsListView.java:4400) at android.widget.AbsListView.onTouchMove(AbsListView.java:5796) at android.widget.AbsListView.onTouchEvent(AbsListView.java:5624) at android.view.View.dispatchTouchEvent(View.java:10011) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2833) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2504) at android.widget.AbsListView.dispatchTouchEvent(AbsListView.java:5561) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2844) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2519) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2844) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2519) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2844) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2519) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2844) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2519) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2844) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2519) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2844) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2519) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2844) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2519) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2844) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2519) at com.android.internal.policy.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2840) at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1853) at android.app.Activity.dispatchTouchEvent(Activity.java:3061) at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:63) at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:63) at com.android.internal.policy.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2801) at android.view.View.dispatchPointerEvent(View.java:10246) at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:5447) at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:5283) at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4721) at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.

编辑 1： 任何人请解释为什么我在上下滚动 3-4 次网格视图时遇到此问题而不是在加载时？

Answer 1

使用Glide加载图片：-

在你的gradle

中添加依赖

compile 'com.github.bumptech.glide:glide:3.7.0'

加载图像：-

Glide.with(mContext).load(mThumbIds[position]).placeholder(R.drawable.user_placeholder).into(imageView);

如果这行不通，试试这个，在 android 块

内添加您应用的 build.gradle

dexOptions {
    incremental true
    javaMaxHeapSize "4g"
    jumboMode = true
}

Answer 2

我建议您使用名为 Glide 的库，要使用此库，请在您的 gradle 文件中添加以下内容

dependencies {
  compile 'com.github.bumptech.glide:glide:3.7.0'
}

然后在您的 res 文件夹中创建一个名为 drawable-nodpi 的文件夹。将所有图像放在那里，不要忘记从 drawable-hdpi 和其他可绘制文件夹中删除图像。确保图像仅存在于 drawable-nodpi 文件夹中。然后代替 imageView.setImageResource(mThumbIds[position]); this ，执行以下操作

Glide.with(mContext)
     .load(mThumbIds[position])
     .diskCacheStrategy( DiskCacheStrategy.NONE )
     .skipMemoryCache( true )
     .int‌o(imageView);

让我知道它是否有效。

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