28 自定义View侧滑栏

ScrollMenuView.java

package com.qf.sxy.customview03.widget;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.widget.HorizontalScrollView;
import android.widget.LinearLayout;

/**
 * Created by sxy on 2016/9/29.
 * 侧滑菜单   左右滚动
 */
public class ScrollMenuView extends HorizontalScrollView {

    //ScrollView容器  菜单  内容
    private LinearLayout container;
    //菜单
    private LinearLayout menuLayout;
    //内容
    private LinearLayout contentLayout;

    //获取屏幕宽度
    private int mScreenWidth =0;
    //菜单展示出来  距离右边屏幕的距离
    private int menuRightPadding = 200;
    //计算出菜单的宽度
    private int menuWidth = 0;

    //标记  是否测量过宽度   测量过 不用再次去测
    private boolean isMeasure = false;

    private boolean isOpen = false;


    public ScrollMenuView(Context context) {
        super(context);
    }

    public ScrollMenuView(Context context, AttributeSet attrs) {
        super(context, attrs);
        //获取整个屏幕宽度
        mScreenWidth = getResources().getDisplayMetrics().widthPixels;
    }


    /**
     * 测量自身容器大小
     * @param widthMeasureSpec
     * @param heightMeasureSpec
     */
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        if(!isMeasure){

            //获取第一个子元素  容器Layout
            container = (LinearLayout) getChildAt(0);
            //获取菜单
            menuLayout = (LinearLayout) container.getChildAt(0);
            //获取 内容
            contentLayout = (LinearLayout) container.getChildAt(1);
            //得到菜单的宽度
            menuWidth = mScreenWidth-menuRightPadding;
            //设置菜单的宽度
            menuLayout.getLayoutParams().width = menuWidth;
            //设置内容宽度大小
            contentLayout.getLayoutParams().width = mScreenWidth;
            //标记测量过了
            isMeasure = true;
        }



    }

    /**
     * 子View的位置
     */
    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        super.onLayout(changed, l, t, r, b);
        //如果改变让ScrollView进行滑动   默认状态  隐藏
        if(changed){
            scrollTo(menuWidth,0);
        }

    }


    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        switch (ev.getAction()){
            case MotionEvent.ACTION_UP://抬起

                //ScrollView滑动距离
                int scrollX = getScrollX();

                //x轴滑动的距离 大于菜单宽度1/2 关闭菜单
                if(scrollX>menuWidth/2){
                    smoothScrollTo(menuWidth,0);
                    Log.e("fmy","关闭");
                    isOpen = true;
                }else{
                    //x轴滑动的距离 小于菜单宽度1/2  打开菜单
                    smoothScrollTo(0,0);
                    Log.e("fmy","开启");
                    isOpen = false;
                }
                //Up事件自身处理
                return true;
        }
        //Down   move的事件
        //交给父类处理
        return super.onTouchEvent(ev);
    }

    //开关
    public void toggle(){
        Log.e("AAA","==>"+isOpen);
        if(isOpen){
             closeContent();
        }else{
            openContent();
        }

    }

    //打开内容
    private void openContent() {
        if(isOpen){
            return;
        }
        Log.e("fmy","关闭");
        smoothScrollTo(menuWidth,0);
        isOpen = true;
    }

    //打开菜单
    private void closeContent() {
        if(!isOpen){
            return;
        }
        Log.e("fmy","开启");
        smoothScrollTo(0,0);
        isOpen = false;
    }
}

MainActivity.java

package com.qf.sxy.customview03;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;

import com.qf.sxy.customview03.widget.ScrollMenuView;

public class MainActivity extends AppCompatActivity {

    private ScrollMenuView scrollMenuView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        scrollMenuView = ((ScrollMenuView) findViewById(R.id.scrollMenuView));

    }

    //开关
    public void Myclick(View view) {
        scrollMenuView.toggle();
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.qf.sxy.customview03.MainActivity">

    <com.qf.sxy.customview03.widget.ScrollMenuView
        android:id="@+id/scrollMenuView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"

       >
      "<!--  android:scrollbars="none-->
        <LinearLayout
            android:id="@+id/container"
            android:orientation="horizontal"
            android:layout_width="match_parent"
            android:layout_height="match_parent">
            <!--菜单-->
            <LinearLayout
                android:id="@+id/menu_layout"
                android:layout_width="wrap_content"
                android:orientation="vertical"
                android:background="@mipmap/img_frame_background"
                android:layout_height="match_parent">

            </LinearLayout>
            <!--内容-->
            <LinearLayout
                android:id="@+id/content_layout"
                android:orientation="vertical"
                android:background="@mipmap/qq"
                android:layout_width="wrap_content"
                android:layout_height="match_parent">
                <Button
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="开关"
                    android:onClick="Myclick"/>

            </LinearLayout>

        </LinearLayout>


    </com.qf.sxy.customview03.widget.ScrollMenuView>
</RelativeLayout>