Question

我想调整imageview的大小，但我的代码不起作用。这是代码：

private class ImagePagerAdapter extends PagerAdapter {


  private int[] mImages = new int[] {
    R.drawable.kuhpps,
    R.drawable.kuhpps,
    R.drawable.kuhpps  
};

错误代码的一部分：

@Override
public Object instantiateItem(ViewGroup container, int position){
  Context context = MainActivity.this;
  ImageView imageView = new ImageView(context);

  int padding = context.getResources().getDimensionPixelSize(
      R.dimen.padding_medium);
  imageView.setPadding(padding, padding, padding, padding);
  imageView.getLayoutParams().height = 30;
  imageView.getLayoutParams().width = 30;     
  imageView.setImageResource(mImages[position]);

  ((ViewPager) container).addView(imageView, 0);
  return imageView;
}

Answer 1

您需要设置Layout Params的高度和重量。您正在更新LayoutParams getLayoutParams实例，但不会更改视图。

这样做是为了更改ImageView Layout size。

ViewGroup.LayoutParams layoutParams = new ViewGroup.LayoutParams(300,300);
imageView.setLayoutParams(layoutParams);

Answer 2

在viewpager的适配器中：

@Override
    public Object instantiateItem(ViewGroup container, int position) {

        Context context = ActivityGallery.this;

        ImageView imageView = new ImageView(context);
        imageView.setLayoutParams(new ViewGroup.LayoutParams(mScreenWidth, ViewGroup.LayoutParams.WRAP_CONTENT));
        imageView.setAdjustViewBounds(true);
        imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);             

        Drawable drawable = Drawable.createFromPath(Environment.getExternalStorageDirectory() + "/Android/data/" + getPackageName() + 
                "/"+....+".jpg");           
        if(drawable != null)                
            imageView.setImageDrawable(drawable);

        ((ViewPager) container).addView(imageView, 0);
        return imageView;
    }

mScreenWidth是之前提取的当前屏幕宽度。

如何以编程方式在viewpager中设置imageview的大小？

2 个答案: