//重写ScrollView
public class NotifyingScrollView extends ScrollView {
/**
* @author Cyril Mottier
*/
public interface OnScrollChangedListener {
void onScrollChanged(ScrollView who, int l, int t, int oldl, int oldt);
}
private OnScrollChangedListener mOnScrollChangedListener;
public NotifyingScrollView(Context context) {
super(context);
}
public NotifyingScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public NotifyingScrollView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
protected void onScrollChanged(int l, int t, int oldl, int oldt) {
super.onScrollChanged(l, t, oldl, oldt);
if (mOnScrollChangedListener != null) {
mOnScrollChangedListener.onScrollChanged(this, l, t, oldl, oldt);
}
}
public void setOnScrollChangedListener(OnScrollChangedListener listener) {
mOnScrollChangedListener = listener;
}
}
布局引用重写NotifyingScrollView控件
<你的项目路径.NotifyingScrollView
android:id="@id/sv_personal"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/layout_bg"
android:scrollbars="none" > <LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/layout_bg"
android:orientation="vertical" >
你要显示的内容
</LinearLayout>
</你的项目路径.NotifyingScrollView>
activity使用引用
NotifyingScrollView sv_personal=(NotifyingScrollView)findViewById(R.id.sv_personal);
sv_personal.setOnScrollChangedListener(mOnScrollChangedListener); private NotifyingScrollView.OnScrollChangedListener mOnScrollChangedListener = new NotifyingScrollView.OnScrollChangedListener() {
public void onScrollChanged(ScrollView who, int l, int t, int oldl, int oldt) {
int Height=Utility.dip2px(context, 130);
float ratio =Math.max(Math.min(1, t/Height), 0);
//导航控件
linar_top.setAlpha(ratio* 255);
}
};
int Height=Utility.dip2px(context, 130); 130为要滑动的高度