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...我给它测试了一些朋友，他们说我的应用程序在GridView上崩溃..应用程序崩溃或者他们必须滚动在它真的很仔细。有些朋友说GridView没问题（也是我的 - HTC Wildfire，三星Galaxy Mini），但我的三星Galaxy S3，S4的朋友说它崩溃了。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);

                }
            });

ImageAdapter：

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，它将我的GridView元素的大小调整为2列，并在多个屏幕上看起来很好：

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）

这会在 UI线程上进行位图读取和解码，这会导致延迟打嗝。如果这是一个问题，请考虑使用setImageDrawable（android.graphics.drawable.Drawable）或setImageBitmap（android.graphics.Bitmap）和BitmapFactory。

我强烈建议您使用Picasso库来显示图片。在getView()：

中的函数中将库添加到项目调用之后

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

就是这样。

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; 
    }
}

Android GridView在某些设备上崩溃或速度很慢（三星Galaxy S4，S3）

1 个答案: