android - 如何在我的 android gridview 中显示来自互联网的图像并显示完整图像？

Question

如何在 android 应用程序中显示从互联网到 gridview 的图像。在 gridview 中显示 clicl om 任何图像后，它将在从左向右滑动和向右滑动 tp left 后显示全屏图像。我已经实现了一些代码，但存在一个错误。显示填充图像后如何滑动这些图像。

图像适配器

public class ImageAdapter extends BaseAdapter {
    private Context mContext;

// Keep all Images in array
public Integer[] mThumbIds = {
        R.drawable.img_2, R.drawable.img_3,
        R.drawable.img_4
};

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

@Override
public int getCount() {
    // TODO Auto-generated method stub
    return mThumbIds.length;
}

@Override
public Object getItem(int position) {
    // TODO Auto-generated method stub
     return mThumbIds[position];
}

@Override
public long getItemId(int position) {

    return 0;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    ImageView imageView;
    if (convertView == null) {  
     imageView = new ImageView(mContext);
    //imageView.setImageResource(mThumbIds[position]);
    imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
    imageView.setLayoutParams(new GridView.LayoutParams(70, 70));
    } else {
        imageView = (ImageView) convertView;
    }
    imageView.setImageResource(mThumbIds[position]);
    return imageView;
}
}

全图:

public class FullImageActivity extends Activity {


 private static final String LOGID = "CHECKTHISOUT";

private static final int SWIPE_MIN_DISTANCE = 160;
private static final int SWIPE_MAX_OFF_PATH = 250;
private static final int SWIPE_THRESHOLD_VELOCITY = 200;
private GestureDetector gestureDetector;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.full_image);

     // get intent data
    Intent i = getIntent();

    // Selected image id
    int position = i.getExtras().getInt("id");
    ImageAdapter imageAdapter = new ImageAdapter(this);

    ImageView imageView = (ImageView) findViewById(R.id.full_image_view);
    imageView.setImageResource(imageAdapter.mThumbIds[position]);

    gestureDetector = new GestureDetector(new MyGestureDetector());
}
private class MyGestureDetector extends SimpleOnGestureListener {
    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
                float velocityY) {
        try {
            if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
                return false;
            // right to left swipe
            if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE
                    && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                next();
            } else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE
                    && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                previous();
            }
        } catch (Exception e) {
            // nothing
        }
        return false;
    }
    public void next()
    {

    }
    public void previous()
    {

    }
}
}

Answer 1

您可以在 gridview 中显示图像，然后您可以使用 viewpager 通过滑动显示全屏图像。我建议您重复使用这些图像，而不是每次都从互联网上下载它们。您可以利用可用的库，如 https://github.com/nostra13/Android-Universal-Image-Loader它将为您处理缓存机制。