android实现主流APP无限轮播

作者: 阿跳爱学习 | 来源:发表于2019-04-16 00:51 被阅读0次

直接上代码，代码里边都有注释。
自定义ViewPager，自定义主要是为了处理用户手指按下停止轮播，抬起继续轮播事件。

package com.example.administrator.ximalayademo.view;

import android.content.Context;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;

/**
 * 自定义ViewPage
 */

public class BannerViewPage extends ViewPager {

    private OnBannerViewPageTouchListener mTouchListener;

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

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

    /**
     * 判断触摸事件
     *
     * @param ev
     * @return
     */
    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        switch (ev.getAction()) {
            case MotionEvent.ACTION_DOWN: //手指按下
                setIsTouch(true);
                break;
            case MotionEvent.ACTION_UP: //手指抬起
                setIsTouch(false);
                break;
        }
        return super.onTouchEvent(ev);
    }

    public void setOnBannerViewPageTouchListener(OnBannerViewPageTouchListener listener) {
        mTouchListener = listener;
    }

    public interface OnBannerViewPageTouchListener {
        void onBannerPageTouch(boolean isTouch);
    }

    private void setIsTouch(boolean isTouch) {
        if (mTouchListener != null) {
            mTouchListener.onBannerPageTouch(isTouch);
        }
    }
}

adapter:

package com.example.administrator.ximalayademo.adapter;

import android.support.v4.view.PagerAdapter;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

import java.util.List;

/**
 * Created by Administrator on 2019/4/12.
 */

public class LooperPageAdapter extends PagerAdapter {

    private List<Integer> mImage = null;

    @Override
    public int getCount() {
        if (mImage != null) {
            return Integer.MAX_VALUE;
        }
        return 0;
    }

    @Override
    public boolean isViewFromObject(View view, Object object) {
        return view == object;
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        int rePosition = position % mImage.size();
        //创建ImageView并且设置ImageView的背景图
        ImageView imageView = new ImageView(container.getContext());
        imageView.setImageResource(mImage.get(rePosition));
        imageView.setScaleType(ImageView.ScaleType.FIT_XY);
        //将设置好的ImageView设置到容器中
        container.addView(imageView);
        return imageView;
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        container.removeView((View) object);
    }

    /**
     * 设置数据
     *
     * @param image
     */
    public void setData(List<Integer> image) {
        mImage = image;
    }

    /**
     * 获取数据大小，此方法是用来设置用户往左边滑动时的操作
     *
     * @return
     */
    public int getDataSize() {
        if (mImage != null) {
            return mImage.size();
        }
        return 0;
    }
}

普通shape 文件（指示点，白色）：

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval">

    <size
        android:width="30px"
        android:height="30px" />

    <solid android:color="#FFFFFF" />

</shape>

当前shape文件(指示点，橙色)：

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
   android:shape="oval" >

    <size
        android:width="30px"
        android:height="30px"/>

    <solid android:color="#EE3B3B"/>

</shape>

AndroidManifest：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.administrator.ximalayademo">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">

        <activity android:name=".LooperPageActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>

</manifest>

布局文件：

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

    <!--重写了onTouchEvent的ViewPage-->
    <com.example.administrator.ximalayademo.view.BannerViewPage
        android:id="@+id/looper_page"
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:overScrollMode="never" />

    <!--用户放置指示点的容器-->
    <LinearLayout
        android:id="@+id/linearLayout_point"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/looper_page"
        android:layout_marginTop="-20dp"
        android:gravity="center"
        android:orientation="horizontal" />

</RelativeLayout>

Activity:

package com.example.administrator.ximalayademo;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.support.annotation.Nullable;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.widget.LinearLayout;

import com.example.administrator.ximalayademo.adapter.LooperPageAdapter;
import com.example.administrator.ximalayademo.view.BannerViewPage;

import java.util.ArrayList;
import java.util.List;

/**
 * 轮播Activity
 */

public class LooperPageActivity extends Activity {

    private BannerViewPage mLooperPage;
    private LooperPageAdapter mLooperPageAdapter;
    private static final List<Integer> sImage = new ArrayList<>();
    private boolean mIsTouch = false;
    private LinearLayout linearLayout_point;

    //加载图片资源
    static {
        sImage.add(R.mipmap.banner1);
        sImage.add(R.mipmap.banner2);
        sImage.add(R.mipmap.banner3);
    }

    private Handler mHandler;

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

        //创建一个Handler实现自动轮播
        mHandler = new Handler();
    }

    /**
     * 当界面绑定到窗口
     */
    @Override
    public void onAttachedToWindow() {
        super.onAttachedToWindow();
        mHandler.post(mRunnableTask);
    }

    /**
     * 当界面从窗口解绑
     */
    @Override
    public void onDetachedFromWindow() {
        super.onDetachedFromWindow();
        mHandler.removeCallbacks(mRunnableTask);
    }

    /**
     * 自动轮播线程
     * mIsTouch：如果 = false，表示用户手指没触摸按下，则轮播，如果 = true 表示用户手指触摸按下，停止轮播
     */
    private Runnable mRunnableTask = new Runnable() {
        @Override
        public void run() {
            if (!mIsTouch) {
                int currentItem = mLooperPage.getCurrentItem();
                mLooperPage.setCurrentItem(++currentItem, true);
            }
            mHandler.postDelayed(this, 3000);
        }
    };

    /**
     * 初始化控件
     */
    private void initView() {
        mLooperPage = (BannerViewPage) findViewById(R.id.looper_page);
        mLooperPageAdapter = new LooperPageAdapter();
        mLooperPageAdapter.setData(sImage);
        mLooperPage.setAdapter(mLooperPageAdapter);

        //设置初始位置，最好不要是第一个，如果是第一个将不能向前滑动。
        mLooperPage.setCurrentItem(mLooperPageAdapter.getDataSize() * 100, false);
        //设置自定义接口
        mLooperPage.setOnBannerViewPageTouchListener(OnTouchListener);
        mLooperPage.addOnPageChangeListener(OnPageChangeListener);

        //获取页面的容器控件
        linearLayout_point = (LinearLayout) findViewById(R.id.linearLayout_point);
        insertPoint();
    }

    /**
     * 根据图片的数量动态创建View的数量，然后AddView到页面的容器控件（linearLayout_point）
     */
    private void insertPoint() {
        for (int i = 0; i < sImage.size(); i++) {
            View point = new View(this);
            LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(30, 30);
            point.setBackground(getResources().getDrawable(R.drawable.shape_point_normal));
            params.leftMargin = 20;
            point.setLayoutParams(params);
            linearLayout_point.addView(point);
        }
    }

    /**
     * 捕获到当前显示轮播图位置
     */
    private ViewPager.OnPageChangeListener OnPageChangeListener = new ViewPager.OnPageChangeListener() {

        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

        }

        @Override
        public void onPageSelected(int position) {
            int rePosition;
            if (mLooperPageAdapter.getDataSize() != 0) {
                rePosition = position % mLooperPageAdapter.getDataSize();
            } else {
                rePosition = 0;
            }
            setPosition(rePosition);
        }

        @Override
        public void onPageScrollStateChanged(int state) {

        }
    };


    private void setPosition(int position) {
        for (int i = 0; i < linearLayout_point.getChildCount(); i++) {
            View point = linearLayout_point.getChildAt(i);
            if (i != position) {
                //普通颜色的点
                point.setBackground(getResources().getDrawable(R.drawable.shape_point_normal));
            } else {
                //选中颜色的点
                point.setBackground(getResources().getDrawable(R.drawable.shape_point_selected));
            }
        }
    }

    /**
     * 实现自定义接口
     */
    private BannerViewPage.OnBannerViewPageTouchListener OnTouchListener = new BannerViewPage.OnBannerViewPageTouchListener() {
        @Override
        public void onBannerPageTouch(boolean isTouch) {
            mIsTouch = isTouch;
        }
    };
}

Screenrecorder-2019-04-16-10-18-25-549[1].gif

android实现主流APP无限轮播

相关文章

网友评论

延伸阅读

深度阅读

栏目导航

热点阅读