圖片放大縮小
第一、可以通過Matrix物件來變換圖像，在選擇的時候放大，在失去焦點的時候，縮小到原來的大小。
double scale = 1.2;
int width = bm.getWidth();
int height = bm.getHeight();
Log.i("size:", width+"");
float scaleWidth = (float)(scale*width);
float scaleHeight = (float)(scale*height);
Log.i("size:", scaleWidth+"");
Matrix matrix = new Matrix();
matrix.postScale(scaleWidth, scaleHeight);
bm = Bitmap.createBitmap(bm, 0, 0, width, height, matrix, true);
第二 、通過動畫
<?xml version="1.0" encoding="utf-8"?>
<scale
xmlns:android="http://schemas.android.com/apk/res/android"
android:interpolator="@android:anim/decelerate_interpolator"
android:fromXScale="1"
android:toXScale="1.1"
android:fromYScale="1"
android:toYScale="1.1"
android:pivotX="50%"
android:pivotY="50%"
android:duration="500">
</scale>
第三、通過setLayoutParams
view.setLayoutParams(new Gallery.LayoutParams(150,150));
int mCounts = g.getCount() - 1;
if(position>0 && (position < mCounts)){
g.getChildAt(position - 1).setLayoutParams(new Gallery.LayoutParams(136, 88));
g.getChildAt(position + 1).setLayoutParams(new Gallery.LayoutParams(136, 88));
}
if(position == 0){
g.getChildAt(position + 1).setLayoutParams(new Gallery.LayoutParams(136, 88));
}
if(position == mCounts){
g.getChildAt(position - 1).setLayoutParams(new Gallery.LayoutParams(136, 88));
}
注釋：其中(136, 88)是gallery中圖片的大小，是在ImageAdapter裡面設置的。(150,150)是選中圖片放大後的大小，可以隨便設置，只要跟(136, 88)區別就行了，是為了觀察變化，我設置的是150而已。
第四 、通過動畫和LayoutParam結合
gallery.setOnItemSelectedListener(new OnItemSelectedListener(){
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
ImageView v = (ImageView)arg1;
if(tempView != null && v.hashCode() != tempView.hashCode()){
tempView.setLayoutParams(new Gallery.LayoutParams(50,50));
}
v.startAnimation(toLarge);
tempView = v;
v.setLayoutParams(new Gallery.LayoutParams(60,60));
//
//v.setLayoutParams(new Gallery.LayoutParams(130,130));
tvName.setText(tempList.get(arg2).getPicName());
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
tvName.setText("Nothing selected .");
}
});