關於gallery點擊圖片放大

思路:
第一種可以在gallery監聽,跳轉到另外一個activity裏面,設置image。點擊imageview時關閉掉這個activity。
第二、可以通過Matrix對象來變換圖像,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);
第三、通過動畫
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″>
第四、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));
}
註釋:其中(136, 88)是gallery中圖片的大小,是在ImageAdapter裏面設置的。(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,是爲了觀察變化,我設置的是150而已。
第五、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 .”);
}
});


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