缩放图库中选定的图像

Question

我如何缩放图库中选定的图像，我尝试过这个，但效果不太好。 `

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，有一个与我将在这里介绍的堆栈溢出类似的解决方案，但它无法正常工作，尽管视图会缩放，但它们最终会停止返回到原始大小。

这是我自己发现的修改后的修复程序，到目前为止似乎工作正常并且不会引起任何问题。

在res/anim中创建一个grow.xml文件将缩放尺寸更改为适合您的任何尺寸

<?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>

复制此类并将其放入继承的图库中或直接放在您的活动中

    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) {
        }

   }

然后在创建图库类之后附上适配器调用

yourGalleryName.setOnItemSelectedListener(new SelectListener(this));  

这对我有用，请告诉我它是否也对您有用。

Answer 2

也许这会帮助你走上正轨：

public class bitmaptest extends Activity {
@Override
public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    LinearLayout linLayout = new LinearLayout(this);

    // load the origial BitMap (500 x 500 px)
    Bitmap bitmapOrg = BitmapFactory.decodeResource(getResources(), 
           R.drawable.android);

    int width = bitmapOrg.width();
    int height = bitmapOrg.height();
    int newWidth = 200;
    int newHeight = 200;

    // calculate the scale - in this case = 0.4f
    float scaleWidth = ((float) newWidth) / width;
    float scaleHeight = ((float) newHeight) / height;

    // createa matrix for the manipulation
    Matrix matrix = new Matrix();
    // resize the bit map
    matrix.postScale(scaleWidth, scaleHeight);
    // rotate the Bitmap
    matrix.postRotate(45);

    // recreate the new Bitmap
    Bitmap resizedBitmap = Bitmap.createBitmap(bitmapOrg, 0, 0, 
                      width, height, matrix, true); 

    // make a Drawable from Bitmap to allow to set the BitMap 
    // to the ImageView, ImageButton or what ever
    BitmapDrawable bmd = new BitmapDrawable(resizedBitmap);

    ImageView imageView = new ImageView(this);

    // set the Drawable on the ImageView
    imageView.setImageDrawable(bmd);

    // center the Image
    imageView.setScaleType(ScaleType.CENTER);

    // add ImageView to the Layout
    linLayout.addView(imageView, 
            new LinearLayout.LayoutParams(
                  LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT
            )
    );

    // set LinearLayout as ContentView
    setContentView(linLayout);
}

}