android - 缩放图库中的选定图像

Question

我如何缩放图库中选定的图像，我试过了，但效果不是很好。 `

public void  onItemSelected  (AdapterView<?>  parent, View  v, int position, long id) 
{
    Animation grow = AnimationUtils.loadAnimation(DetailTvShow.this, R.anim.grow);

            Button btn = (Button)findViewById(R.id.button1);
            btn.setText("saison "+(position+1));
            View sideView = v.findViewById(position + 1);
            View sideView1 = v.findViewById(position - 1);

           if ((sideView != null)||(sideView1 != null)){
               ((ImageView)sideView).setLayoutParams(new Gallery.LayoutParams(80, 115));

               ((ImageView)sideView1).setLayoutParams(new `enter code here`Gallery.LayoutParams(80, 115));

           }

      /*      sideView = parent.findViewById(position + 1);
          if (sideView != null)
               ((ImageView)sideView).setLayoutParams(new Gallery.LayoutParams(80, 115));  */

            v.startAnimation(grow);
            v.setLayoutParams(new Gallery.LayoutParams(105, 140));
        }`

Answer 1

我遇到了同样的问题，有一个与我将在此处介绍的堆栈溢出解决方案类似的解决方案，但它无法正常工作，尽管 View 会缩放，但它们最终会停止恢复到原始大小。

这是我为自己找到的修改后的修复程序，到目前为止似乎工作正常并且不会导致任何问题。

在 res/anim 中创建一个 grow.xml 文件将缩放大小更改为适合您的大小

<?xml version="1.0" encoding="utf-8"?>
<scale xmlns:android="http://schemas.android.com/apk/res/android"
       android:fromXScale="1.0"
       android:toXScale="1.075"
       android:fromYScale="1.0"
       android:toYScale="1.075"
       android:duration="150"
       android:pivotX="50%"
       android:pivotY="50%"
       android:interpolator="@android:anim/accelerate_decelerate_interpolator"
       android:fillAfter="true"> 
</scale>

复制这个类并将其放在您继承的图库中或放在您的 Activity 中

    private class SelectListener implements AdapterView.OnItemSelectedListener {

        private Animation grow     = null;
        private View      lastView = null; 

        public SelectListener(Context c) {
             grow = AnimationUtils.loadAnimation(c, R.anim.grow);
        }

        public void  onItemSelected(AdapterView<?>  parent, View  v, int position, long id)         {

            // Shrink the view that was zoomed 
            try { if (null != lastView) lastView.clearAnimation();
            } catch (Exception clear) { }

            // Zoom the new selected view
            try { v.startAnimation(grow); } catch (Exception animate) {}

            // Set the last view so we can clear the animation 
            lastView = v;
        }

        public void onNothingSelected(AdapterView<?>  parent) {
        }

   }

然后在您创建图库类并附加适配器调用之后

yourGalleryName.setOnItemSelectedListener(new SelectListener(this));  

这对我有用，如果对你也有用，请告诉我。