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：

Android高仿网易新闻客户端之侧滑菜单_ide

附上代码地址：

​​https://github.com/shineflower/NeteaseNews.git​​