承接上一篇文章:Android高仿网易新闻客户端之动态添加标签,今天实现侧滑菜单的效果。
关于侧滑菜单,有很多种实现方式:
1. 自定义ViewGroup 请参考:Android实现网易新闻客户端侧滑菜单(二)
2. 使用第三方开源框架 请参考:Android实现网易新闻客户端侧滑菜单(一)
今天用第三种方法,自定义HorizontalScrollView,相比较自定义ViewGroup来说,不需要处理ACTION_MOVE事件了,更简单。
SlidingMenu.java
package com.jackie.neteasenews.view; import android.content.Context; import android.content.res.TypedArray; import android.util.AttributeSet; import android.util.TypedValue; import android.view.MotionEvent; import android.view.ViewGroup; import android.widget.HorizontalScrollView; import android.widget.LinearLayout; import com.jackie.neteasenews.R; /** * Created by Jackie on 2016/1/8. * 侧滑菜单 */ public class SlidingMenu extends HorizontalScrollView { private LinearLayout mWrapperLayout; private ViewGroup mMenuView; private ViewGroup mMainView; private int mScreenWidth; private int mMenuWidth; private int mMenuPaddingRight; private boolean mIsOnce = false; public SlidingMenu(Context context) { this(context, null); } public SlidingMenu(Context context, AttributeSet attrs) { this(context, attrs, 0); } public SlidingMenu(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); mScreenWidth = context.getResources().getDisplayMetrics().widthPixels; TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.SlidingMenu); mMenuPaddingRight = ta.getDimensionPixelSize(R.styleable.SlidingMenu_paddingRight, (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_PX, 50, context.getResources().getDisplayMetrics())); ta.recycle(); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { if (!mIsOnce) { mWrapperLayout = (LinearLayout) getChildAt(0); mMenuView = (ViewGroup) mWrapperLayout.getChildAt(0); mMainView = (ViewGroup) mWrapperLayout.getChildAt(1); mMenuView.getLayoutParams().width = mMenuWidth = mScreenWidth - mMenuPaddingRight; mMainView.getLayoutParams().width = mScreenWidth; mIsOnce = true; } super.onMeasure(widthMeasureSpec, heightMeasureSpec); } @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { super.onLayout(changed, l, t, r, b); if (changed) { scrollTo(mMenuWidth, 0); } } @Override public boolean onTouchEvent(MotionEvent ev) { switch (ev.getAction()) { case MotionEvent.ACTION_UP: if (getScrollX() > mMenuWidth / 2) { scrollTo(mMenuWidth, 0); } else { scrollTo(0, 0); } return true; } return super.onTouchEvent(ev); } }
其中还用到了自定义属性,定义菜单距屏幕的右边距,自定义属性的用法,这里不作介绍,大家可以看代码。
activity_content.xml<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:jackie="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal" > <com.jackie.neteasenews.view.SlidingMenu android:id="@+id/menu" android:layout_width="match_parent" android:layout_height="match_parent" jackie:paddingRight="200px"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <include layout="@layout/activity_menu"/> <include layout="@layout/activity_main"/> </LinearLayout> </com.jackie.neteasenews.view.SlidingMenu> </LinearLayout>由于我仿网易客户端的时候用到了ViewPager,滑动事件与侧滑菜单有冲突,所以,我自定义ViewPager将滑动事件禁用掉了。
CustomViewPager.java
package com.jackie.neteasenews.view; import android.content.Context; import android.support.v4.view.ViewPager; import android.util.AttributeSet; import android.view.MotionEvent; /** * Created by Jackie on 2016/1/8. * 提供禁止滑动的接口 */ public class CustomViewPager extends ViewPager { private boolean mIsPagingEnabled = true; public CustomViewPager(Context context) { this(context, null); } public CustomViewPager(Context context, AttributeSet attrs) { super(context, attrs); } @Override public boolean onTouchEvent(MotionEvent event) { return mIsPagingEnabled && super.onTouchEvent(event); } @Override public boolean onInterceptTouchEvent(MotionEvent event) { return mIsPagingEnabled && super.onInterceptTouchEvent(event); } public void setIsPagingEnabled(boolean isPagingEnabled) { this.mIsPagingEnabled = isPagingEnabled; } }然后调用setIsPagingEnable(false)就OK了。
效果图如下:
附上代码地址:
https://github.com/shineflower/NeteaseNews.git