HorizontalScrollView 一屏显示多个页面

布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.lib.demo.viewpagedemo.MyScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <LinearLayout
            android:id="@+id/container"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="#333333"
            android:orientation="horizontal"
            android:paddingLeft="15dp"
            android:paddingRight="15dp">
        </LinearLayout>
    </com.lib.demo.viewpagedemo.MyScrollView>
</LinearLayout>

重写HorizontalScrollView

package com.lib.demo.viewpagedemo;

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.HorizontalScrollView;

import java.util.ArrayList;

/**
 * Created by CHENGC on 2018/1/18.
 */

public class MyScrollView extends HorizontalScrollView {
    private int subChildCount = 0;
    private ViewGroup firstChild = null;
    private int downX = 0;
    private int currentPage = 0;
    private ArrayList<Integer> pointList = new ArrayList<Integer>();

    public MyScrollView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }


    public MyScrollView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public MyScrollView(Context context) {
        super(context);
        init();
    }

    private void init() {
        setHorizontalScrollBarEnabled(false);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        receiveChildInfo();
    }

    public void receiveChildInfo() {
        firstChild = (ViewGroup) getChildAt(0);
        if (firstChild != null) {
            subChildCount = firstChild.getChildCount();
            for (int i = 0; i < subChildCount; i++) {
                if (((View) firstChild.getChildAt(i)).getWidth() > 0) {
                    pointList.add(((View) firstChild.getChildAt(i)).getLeft() - firstChild.getPaddingLeft());
                }
            }
        }

    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        switch (ev.getAction()) {
            case MotionEvent.ACTION_DOWN:
                downX = (int) ev.getX();
                break;
            case MotionEvent.ACTION_MOVE: {

            }
            break;
            case MotionEvent.ACTION_UP:
            case MotionEvent.ACTION_CANCEL: {
                if (Math.abs((ev.getX() - downX)) > getWidth() / 10) {
                    if (ev.getX() - downX > 0) {
                        smoothScrollToPrePage();
                    } else {
                        smoothScrollToNextPage();
                    }
                } else {
                    smoothScrollToCurrent();
                }
                return true;
            }
        }
        return super.onTouchEvent(ev);
    }

    private void smoothScrollToCurrent() {
        smoothScrollTo(pointList.get(currentPage), 0);
    }

    private void smoothScrollToNextPage() {
        if (currentPage < subChildCount - 1) {
            currentPage++;
            smoothScrollTo(pointList.get(currentPage), 0);
        }
    }

    private void smoothScrollToPrePage() {
        if (currentPage > 0) {
            currentPage--;
            smoothScrollTo(pointList.get(currentPage), 0);
        }
    }

    /**
     * 下一页
     */
    public void nextPage() {
        smoothScrollToNextPage();
    }

    /**
     * 上一页
     */
    public void prePage() {
        smoothScrollToPrePage();
    }

    /**
     * 跳转到指定的页面
     *
     * @param page
     * @return
     */
    public boolean gotoPage(int page) {
        if (page > 0 && page < subChildCount - 1) {
            smoothScrollTo(pointList.get(page), 0);
            currentPage = page;
            return true;
        }
        return false;
    }
}

使用：

package com.lib.demo.viewpagedemo;

import android.content.Context;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.DisplayMetrics;
import android.util.TypedValue;
import android.widget.ImageView;
import android.widget.LinearLayout;

public class HorizontalScrollViewActivity extends AppCompatActivity {

    private LinearLayout mContainer = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_horizontal_scroll_view);

        mContainer = (LinearLayout) findViewById(R.id.container);

        int def = (getWinWidth() - dip2px(this, 30) - dip2px(this, 10)) / 2;
        int w = def;
        int h = (def / 4) * 3;
        int num = 3;
        for (int i = 0; i < num; i++) {
            LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(w, h);
            if (i == num - 1) {
                params.rightMargin = 0;
            } else {
                params.rightMargin = dip2px(this, 10);
            }
            ImageView imageView1 = new ImageView(this);
            imageView1.setLayoutParams(params);
            imageView1.setImageResource(R.drawable.t02);
            imageView1.setScaleType(ImageView.ScaleType.CENTER);
            mContainer.addView(imageView1);
        }
    }

    @Override
    protected void onResume() {
        //        ((MyScrollView)mContainer.getParent()).init();
        super.onResume();
    }

    private int getWinWidth() {
        DisplayMetrics dm = new DisplayMetrics();
        //获取屏幕信息
        getWindowManager().getDefaultDisplay().getMetrics(dm);
        return dm.widthPixels;
    }

    private int getWinHeight() {
        DisplayMetrics dm = new DisplayMetrics();
        //获取屏幕信息
        getWindowManager().getDefaultDisplay().getMetrics(dm);
        return dm.heightPixels;
    }

    public static int dip2px(Context context, float dpValue) {
        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dpValue, context
                .getResources().getDisplayMetrics());
    }
}