感谢红橙Darren博主
布局文件中
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="/apk/res/android"xmlns:tools="/tools"android:layout_width="match_parent"android:layout_height="match_parent"xmlns:app="/apk/res-auto"tools:context="com.app.rzm.test.TestSlidingViewActivity"><monlibrary.views.SlidingViewapp:menuPaddingRight="100dp"app:menuParallax="true"android:layout_width="match_parent"android:layout_height="match_parent"><LinearLayoutandroid:orientation="horizontal"android:layout_width="match_parent"android:layout_height="match_parent"><LinearLayoutandroid:background="#ffffff"android:layout_width="match_parent"android:layout_height="match_parent"><TextViewandroid:layout_width="match_parent"android:text="我在侧边位置"android:textSize="50sp"android:layout_height="match_parent" /></LinearLayout><LinearLayoutandroid:layout_width="match_parent"android:background="@color/transparent"android:layout_height="match_parent"><TextViewandroid:layout_width="match_parent"android:text="我在主版位置"android:textSize="50sp"android:layout_height="match_parent" /></LinearLayout></LinearLayout></monlibrary.views.SlidingView></LinearLayout>
package monlibrary.views;import android.content.Context;import android.content.res.Resources;import android.content.res.TypedArray;import android.graphics.Color;import android.util.AttributeSet;import android.util.DisplayMetrics;import android.util.TypedValue;import android.view.GestureDetector;import android.view.MotionEvent;import android.view.View;import android.view.ViewGroup;import android.widget.FrameLayout;import android.widget.HorizontalScrollView;import android.widget.ImageView;import monlibrary.R;import monlibrary.utils.LogUtils;/*** Created by renzhenming on /3/28.** SlidingView继承自HorizontalScrollView，所以在布局中使用的时候，需要设置一个唯一的子View，然后* 往这个子 view中添加侧边栏和主栏*/public class SlidingView extends HorizontalScrollView{private final String TAG = getClass().getSimpleName();//侧滑菜单的宽度private final int mMenuWidth;private final Context mContext;//默认的侧边栏滑出最大位置距离右边屏幕的距离private float mMenuPaddingRight = 100;//侧边菜单布局private View mMenuView;//主页内容布局,包括用户的contentView和我们添加的阴影效果private ViewGroup mContentView;//侧边栏menu是否打开private boolean mMenuOpened;//设置抽屉模式private boolean mParallaxMode;//手势监听器private GestureDetector mGestureDetector;//快速滑动打开收起侧边栏的敏感指数，越大敏感度越小，约不容易打开关闭//不能过大也能过小，private float mSensitivity = 1000;//设置阴影private ImageView mShadowIv;//视差模式下，默认的侧边栏缩进的距离相对于侧边栏宽度的比例private float mTransitionPercent = 0.8f;//阴影透明度能达到的最深颜色值private String mAlphaColor="#99000000";public SlidingView(Context context) {this(context,null);}public SlidingView(Context context, AttributeSet attrs) {this(context, attrs,-1);}public SlidingView(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);mContext = context;TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.SlidingView);mMenuPaddingRight = typedArray.getDimension(R.styleable.SlidingView_menuPaddingRight, dp2px((int) mMenuPaddingRight));mParallaxMode = typedArray.getBoolean(R.styleable.SlidingView_menuParallax, mParallaxMode);//侧边栏的宽度mMenuWidth = (int) (getScreenWidth() - mMenuPaddingRight);typedArray.recycle();mGestureDetector = new GestureDetector(context, new GestureListener());}@Overridepublic boolean onTouchEvent(MotionEvent ev) {//如果需要GestureDetector处理，则由其处理if (mGestureDetector.onTouchEvent(ev)){return mGestureDetector.onTouchEvent(ev);}switch (ev.getAction()){case MotionEvent.ACTION_UP://这个位置指的是，当前这个view和手机屏幕左边届交点距离view最左侧的距离，这里最小为0，不会为负//当侧边栏滑出的过程中，scrollX呈递减的趋势，直到=0int scrollX = getScrollX();LogUtils.d(TAG,"scrollX:"+scrollX);if (scrollX > mMenuWidth/2){//滑出了一部分，但是还没有到宽度的1／2closeMenu();}else{openMenu();}return false;}return super.onTouchEvent(ev);}/*** 打开侧边栏*/private void openMenu() {smoothScrollTo(0,0);mMenuOpened = true;}/*** 关闭侧边栏*/private void closeMenu() {smoothScrollTo(mMenuWidth,0);mMenuOpened = false;}@Overrideprotected void onLayout(boolean changed, int l, int t, int r, int b) {super.onLayout(changed, l, t, r, b);//默认设置侧滑菜单隐藏if (changed){//scrollTo 让当前屏幕左边界滑动到（mMenuWidth，0）这个坐标位置scrollTo(mMenuWidth, 0);}}@Overrideprotected void onFinishInflate() {super.onFinishInflate();//获取根viewViewGroup rootView = (ViewGroup) getChildAt(0);int childCount = rootView.getChildCount();if (childCount > 2){throw new IllegalStateException("you should add two child view at most");}//获取两个布局mMenuView = rootView.getChildAt(0);//给内容添加阴影效果mContentView = new FrameLayout(mContext);ViewGroup.LayoutParams contentParams = new ViewGroup.LayoutParams( ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.MATCH_PARENT);mContentView.setLayoutParams(contentParams);//获取原来的内容布局，并把原来的内容布局从LinearLayout中异常View oldContentView = rootView.getChildAt(1);rootView.removeView(oldContentView);//把原来的内容View 和 阴影加到我们新创建的内容布局中mContentView.addView(oldContentView);//创建阴影mShadowIv = new ImageView(mContext);mShadowIv.setBackgroundColor(Color.parseColor(mAlphaColor));mContentView.addView(mShadowIv);//把包含阴影的新的内容View 添加到 LinearLayout中rootView.addView(mContentView);//设置二者宽度mMenuView.getLayoutParams().width = mMenuWidth;mContentView.getLayoutParams().width = getScreenWidth();}private float dp2px(int dp){return TypedValue.applyDimension(PLEX_UNIT_DIP,dp,getResources().getDisplayMetrics());}/*** 屏幕宽度* @return*/public int getScreenWidth(){Resources resources = getResources();DisplayMetrics metrics = resources.getDisplayMetrics();return metrics.widthPixels;}private class GestureListener extends GestureDetector.SimpleOnGestureListener{// 处理手势快速滑动@Overridepublic boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {//velocityX，velocityY都是朝坐标系正方向滑动为正，负方向为负，表示正方向上单位时间的速度//velocityX为正，表示单位时间内，LogUtils.d(TAG,"velocityX:"+velocityX+",velocityY:"+velocityY);if (mMenuOpened){if (velocityX < -mSensitivity){toggleMenu();return true;}}else{if (velocityX>mSensitivity){toggleMenu();return true;}}return super.onFling(e1, e2, velocityX, velocityY);}}/*** 切换菜单的状态*/private void toggleMenu() {if(mMenuOpened){closeMenu();LogUtils.d(TAG,"close");}else{openMenu();LogUtils.d(TAG,"open");}}@Overrideprotected void onScrollChanged(int l, int t, int oldl, int oldt) {super.onScrollChanged(l, t, oldl, oldt);// l 是 当前滚动的x距离 指的是当前view和屏幕左侧边界相交点距离view最左侧的距离LogUtils.e(TAG,"onScrollChanged：l===="+l);if (mParallaxMode) {//在onLayout中，默认会将这个SlidingView向左移动一个侧边栏宽度//这个时候onScrollChanged会被调用，这时候会执行这行代码，将侧边栏向x轴正方向移动一定比例的l宽度，实际上//也此时，侧边栏已经被放在了主也contentView的下边，此时，滑动contentView的时候，会达到一种视觉差异效果mMenuView.setTranslationX(l * mTransitionPercent);}//给内容添加阴影效果 - 计算梯度值float gradientValue = l * 1f / mMenuWidth;LogUtils.e(TAG,"gradientValue:"+gradientValue);//这是 1 - 0 变化的值//给内容添加阴影效果 - 给阴影的View指定透明度 0 - 1 变化的值float shadowAlpha = 1 - gradientValue;LogUtils.e(TAG,"shadowAlpha:"+shadowAlpha);mShadowIv.setAlpha(shadowAlpha);}}
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