Android GridView 在某些设备(三星 Galaxy S4、S3)上崩溃或速度非常慢

Question

我的应用程序中有一个 GridView，它在几乎所有设备上都非常棒，但是...我用它来测试一些 friend ，他们说我的应用程序在 GridView 上崩溃了..应用程序崩溃了或者他们必须滚动真的很仔细地在里面。有些 friend 说 GridView 还可以(还有我的 - HTC Wildfire、三星 Galaxy Mini)，但我拥有三星 Galaxy S3、S4 的 friend 说它崩溃了。我的 GridView :

public static List<Item> items = new ArrayList<Item>();

...

GridView gridView = (GridView) findViewById(R.id.gridview);
        items.clear();
//add all items to list

    gridView.setAdapter(new ImageAdapter(this, items));
            gridView.setOnItemClickListener(new OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> parent, View v,
                        int position, long id) {
                    Intent i = new Intent(getApplicationContext(), SecondActivity.class);
                    i.putExtra("id", position);
                    startActivity(i);

                }
            });

图像适配器:

public class ImageAdapter extends BaseAdapter {

    private List<Item> items = new ArrayList<Item>();
    private LayoutInflater inflater;

    public ImageAdapter(Context context, List<Item> items) {
        inflater = LayoutInflater.from(context);
        this.items = items;
    }

    @Override
    public int getCount() {
        return items.size();
    }

    @Override
    public Object getItem(int i) {
        return items.get(i);
    }

    @Override
    public long getItemId(int i) {
        return items.get(i).drawable;
    }

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        View v = view;
        ImageView picture;
        TextView name;

        if (v == null) {
            v = inflater.inflate(R.layout.squareimageview, viewGroup, false);
            v.setTag(R.id.picture, v.findViewById(R.id.picture));
            v.setTag(R.id.text, v.findViewById(R.id.text));
        }

        picture = (ImageView) v.getTag(R.id.picture);
        name = (TextView) v.getTag(R.id.text);

        Item item = (Item) items.get(i);

        picture.setImageResource(item.getDrawable());
        name.setText(item.name);

        return v;

    }

}

我的 SquareImageView 类，它将 GridView 元素的大小调整为 2 列，并在多个屏幕上看起来不错:

public class SquareImageView extends ImageView {
    public SquareImageView(Context context) {
        super(context);
    }

    public SquareImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public SquareImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        setMeasuredDimension(getMeasuredWidth(), getMeasuredWidth()); //Snap to width
    }

}

Answer 1

来自 setImageResource() 的文档。 (强调是我的)

This does Bitmap reading and decoding on the UI thread, which can cause a latency hiccup. If that's a concern, consider using setImageDrawable(android.graphics.drawable.Drawable) or setImageBitmap(android.graphics.Bitmap) and BitmapFactory instead.

我强烈建议您使用Picasso用于显示图像的库。将库添加到项目后，在 getView() 中调用以下函数:

Picasso.with(context).load(item.getDrawable()).into(picture);

就是这样。

<小时/>

public class ImageAdapter extends BaseAdapter {

    private List<Item> items = new ArrayList<Item>();
    private LayoutInflater inflater;

    private Context context; 

    public ImageAdapter(Context context, List<Item> items) {
        inflater = LayoutInflater.from(context);
        this.items = items;
        this.context = context;
    }
    .
    .
    .
    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        View v = view;
        ImageView picture;
        TextView name;

        if (v == null) {
            v = inflater.inflate(R.layout.squareimageview, viewGroup, false);
            v.setTag(R.id.picture, v.findViewById(R.id.picture));
            v.setTag(R.id.text, v.findViewById(R.id.text));
        }

        picture = (ImageView) v.getTag(R.id.picture);
        name = (TextView) v.getTag(R.id.text);

        Item item = (Item) items.get(i);

        Picasso.with(context).load(item.getDrawable()).into(picture);
        name.setText(item.name);

        return v; 
    }
}