1、创建 ScrollListener 接口监听滑动距离
public interface ScrollListener {void onScrollChanged(ScrollListenerView scrollView, int x, int y, int oldX, int oldY);
}
view阴影属性
android:elevation="4dp"
2、重写 ScrollView 自定义 ScrollListenerView
public class ScrollListenerView extends ScrollView {private ScrollListener scrollViewListener = null;public ScrollListenerView(Context context) {super(context);}public ScrollListenerView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);}public ScrollListenerView(Context context, AttributeSet attrs) {super(context, attrs);}public void setScrollListener(ScrollListener scrollViewListener) {this.scrollViewListener = scrollViewListener;}@Overrideprotected void onScrollChanged(int x, int y, int oldX, int oldY) {super.onScrollChanged(x, y, oldX, oldY);if (scrollViewListener != null) {scrollViewListener.onScrollChanged(this, x, y, oldX, oldY);}}
}
判断scrollView是否滚动到底部方法
@Override
protected void onScrollChanged(int x, int y, int oldX, int oldY) {super.onScrollChanged(x, y, oldX, oldY);if (scrollViewListener != null) {scrollViewListener.onScrollChanged(this, x, y, oldX, oldY);}if (getScrollY() + getHeight() >= computeVerticalScrollRange()) {Log.d("lgq", "------滚动到最下方------");} else {Log.d("Lgq", "没有到最下方");}
}
3、在layout xml文件使用ScrollListenerView
<com.tianxinyw.mapclient.views.ScrollListenerViewandroid:id="@+id/slv"android:layout_width="match_parent"android:layout_height="match_parent"android:scrollbars="none"><RelativeLayoutandroid:layout_width="match_parent"android:layout_height="match_parent"></RelativeLayout></com.tianxinyw.mapclient.views.ScrollListenerView>上下层标题渐变色布局，titlelitwo是下层
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:id="@+id/activity_popup"android:orientation="vertical"><LinearLayoutandroid:id="@+id/titlelitwo"android:layout_width="match_parent"android:layout_height="38dp"android:background="@color/homeiconokc"android:gravity="center"android:orientation="horizontal"><TextViewandroid:id="@+id/titletetwo"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="天鑫计费2"android:textColor="@color/white"android:textSize="16dp"android:textStyle="bold"/></LinearLayout><LinearLayoutandroid:id="@+id/lishititleli"android:layout_width="match_parent"android:layout_height="38dp"android:background="@color/homeiconokc"android:gravity="center"android:orientation="horizontal"><TextViewandroid:id="@+id/lishititlete"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="天鑫计费"android:textColor="@color/white"android:textSize="16dp"android:textStyle="bold"/></LinearLayout>
4、Activity 实现滑动距离监听接口
public class HomeFragment extends BaseFragment implements ScrollListener{
初始化
@BindView(R.id.slv)
ScrollListenerView slv;设置监听
slv.setScrollListener(this);
实现方法：
@Override
public void onScrollChanged(ScrollListenerView scrollView, int x, int y, int oldX, int oldY) {if (y - oldY > 0&&y>0) {float f = (y + 0f) / 400;//滑动距离350pxif (f > 1) {f = 1f;}if (f < 0) {f = 0;}if (f > 0 && f < 0.3) {f = (float) 0.333;}Log.i("lgq", "......向上滑。。。" + f + ".......y====" + y);lishititleli.setBackgroundColor(Utils.changeAlpha(ContextCompat.getColor(getActivity(), R.color.homeiconokc), (int) (1 - f * 1 * 0xff)));lishititlete.setTextColor(Utils.changeAlpha(ContextCompat.getColor(getActivity(), R.color.white), (int) (1 - f * 1 * 0xff)));titlelitwo.setBackgroundColor(Utils.changeAlpha(ContextCompat.getColor(getActivity(), R.color.homeiconokc), (int) (f * 1 * 0xff)));titletetwo.setTextColor(Utils.changeAlpha(ContextCompat.getColor(getActivity(), R.color.white), (int) (f * 1 * 0xff)));} else if (y-oldY<0&&y>=0){float f = (y + 0f) / 400;//滑动距离350pxif (f > 1) {f = 1f;}if (f < 0) {f = 0;}Log.e("lgq", "......向xia滑。。。" + f + ".......y====" + y + "......zhi====" + (1 - f * 1 * 0xff) + ".....yy===" + f * 1 * 0xff);if (y <= 0||f<0.01) {lishititleli.setBackgroundColor(Utils.changeAlpha(ContextCompat.getColor(getActivity(), R.color.homeiconokc), (int) (1 * 1 * 0xff)));lishititlete.setTextColor(Utils.changeAlpha(ContextCompat.getColor(getActivity(), R.color.white), (int) (1 * 1 * 0xff)));return;}lishititleli.setBackgroundColor(Utils.changeAlpha(ContextCompat.getColor(getActivity(), R.color.homeiconokc), (int) (1 - f * 1 * 0xff)));lishititlete.setTextColor(Utils.changeAlpha(ContextCompat.getColor(getActivity(), R.color.white), (int) (1 - f * 1 * 0xff)));titlelitwo.setBackgroundColor(Utils.changeAlpha(ContextCompat.getColor(getActivity(), R.color.homeiconokc), (int) (f * 1 * 0xff)));titletetwo.setTextColor(Utils.changeAlpha(ContextCompat.getColor(getActivity(), R.color.white), (int) (f * 1 * 0xff)));}}
工具方法：
/*** 修改颜色透明度* @param color* @param alpha* @return*/
public static int changeAlpha(int color, int alpha) {int red = Color.red(color);int green = Color.green(color);int blue = Color.blue(color);return Color.argb(alpha, red, green, blue);
}实现效果:向上滑动渐变颜色，显示隐藏view
demo链接：https://download.csdn.net/download/meixi_android/10966003
附：左滑右滑手势
//渐变色float x1 = 0;float x2 = 0;private int nowpersion = 0;@Overridepublic boolean dispatchTouchEvent(MotionEvent ev) {if (ev.getAction() == MotionEvent.ACTION_DOWN) {
// Log.i("lgq","ssssMainActivity_dispatchTouchEvent==="+ev.getX());x1 = ev.getX();}return super.dispatchTouchEvent(ev);}@Overridepublic boolean onTouch(View v, MotionEvent event) {if (event.getAction() == MotionEvent.ACTION_MOVE) {x2 = event.getX();float h = x1 - x2;// Log.i("lgq","eee==滑动距离aaa===="+(h)+"......"+nowpersion+"...."+x1);float f = (h + 0f) / 640;//滑动距离350pxif (f > 1) {f = 1f;}if (f < 0) {f = 0;}if (nowpersion == 0 && h < 0) {return false;} else if (nowpersion == 0 && h > 0) {if (f < 0.4) {return false;}TextView textView = tabLayout.getTabAt(1).getCustomView().findViewById(R.id.tab_iv);TextView textView0 = tabLayout.getTabAt(0).getCustomView().findViewById(R.id.tab_iv);textView.setTextColor(changeAlpha(ContextCompat.getColor(MainActivity.this, R.color.textlan), (int) (f * 1 * 0xff)));textView0.setTextColor(changeAlpha(ContextCompat.getColor(MainActivity.this, R.color.texthui), (int) (f * 1 * 0xff)));}}return false;}/*** 修改颜色透明度* @param color* @param alpha* @return*/public int changeAlpha(int color, int alpha) {int red = Color.red(color);int green = Color.green(color);int blue = Color.blue(color);return Color.argb(alpha, red, green, blue);}
使用，getArguments(),)
