android 根据滑动隐藏或显示导航类似手机QQ好友个人信息

//重写ScrollViewpublic 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;    }}

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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>

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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);}};

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int Height=Utility.dip2px(context, 130); 130为要滑动的高度

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