带有底部点的Android ViewPager

Question

我想在我的ViewPager中添加3个底部点,就像这样.

我使用FragmentActivity并支持库ViewPager.

Answer 1

不需要那么多代码.

你可以做到这一切的东西,而只用编码这么多viewpager用tablayout.

你的主要布局:

<RelativeLayout
   xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   android:layout_width="match_parent"
   android:layout_height="wrap_content">

   <android.support.v4.view.ViewPager
       android:id="@+id/pager"
       android:layout_width="match_parent"
       android:layout_height="match_parent">

   </android.support.v4.view.ViewPager>
   <android.support.design.widget.TabLayout
       android:id="@+id/tabDots"
       android:layout_alignParentBottom="true"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       app:tabBackground="@drawable/tab_selector"
       app:tabGravity="center"
       app:tabIndicatorHeight="0dp"/>
</RelativeLayout>

在活动或片段中连接UI元素,如下所示:

Java代码:

mImageViewPager = (ViewPager) findViewById(R.id.pager);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabDots);
tabLayout.setupWithViewPager(mImageViewPager, true);

就是这样,你很高兴.

您需要在drawable文件夹中创建以下xml资源文件.

tab_indicator_selected.xml

<?xml version="1.0" encoding="utf-8"?>
<shape
    android:innerRadius="0dp"
    android:shape="oval"
    android:thickness="4dp"
    android:useLevel="false"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <solid android:color="@color/colorAccent"/>
</shape>

tab_indicator_default.xml

<?xml version="1.0" encoding="utf-8"?>
    <shape xmlns:android="http://schemas.android.com/apk/res/android"
            android:innerRadius="0dp"
            android:shape="oval"
            android:thickness="2dp"
            android:useLevel="false">
            <solid android:color="@android:color/darker_gray"/>
    </shape>

tab_selector.xml

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

    <item android:drawable="@drawable/tab_indicator_selected"
          android:state_selected="true"/>

    <item android:drawable="@drawable/tab_indicator_default"/>
</selector>

感觉像我一样懒惰？好吧,以上所有代码都转换成了一个库!

用法

在您的gradle中添加以下内容:

<com.chabbal.slidingdotsplash.SlidingSplashView
        android:id="@+id/splash"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:imageResources="@array/img_id_arr"/>

将以下内容添加到"活动"或"片段"布局中.

<integer-array name="img_id_arr">
   <item>@drawable/img1</item>
   <item>@drawable/img2</item>
   <item>@drawable/img3</item>
   <item>@drawable/img4</item>
</integer-array>

在implementation 'com.chabbal:slidingdotsplash:1.0.2'例如中创建一个整数数组

<RelativeLayout
   xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   android:layout_width="match_parent"
   android:layout_height="wrap_content">

   <android.support.v4.view.ViewPager
       android:id="@+id/pager"
       android:layout_width="match_parent"
       android:layout_height="match_parent">

   </android.support.v4.view.ViewPager>
   <android.support.design.widget.TabLayout
       android:id="@+id/tabDots"
       android:layout_alignParentBottom="true"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       app:tabBackground="@drawable/tab_selector"
       app:tabGravity="center"
       app:tabIndicatorHeight="0dp"/>
</RelativeLayout>

完成!

额外以便收听页面更改使用strings.xml

Github 链接.

Answer 2

viewPager.addOnPageChangeListener(new OnPageChangeListener() {
            @Override
            public void onPageSelected(int position) {

                switch (position) {
    case 0:
        img_page1.setImageResource(R.drawable.dot_selected);
        img_page2.setImageResource(R.drawable.dot);
        img_page3.setImageResource(R.drawable.dot);
        img_page4.setImageResource(R.drawable.dot);
        break;

    case 1:
        img_page1.setImageResource(R.drawable.dot);
        img_page2.setImageResource(R.drawable.dot_selected);
        img_page3.setImageResource(R.drawable.dot);
        img_page4.setImageResource(R.drawable.dot);
        break;

    case 2:
        img_page1.setImageResource(R.drawable.dot);
        img_page2.setImageResource(R.drawable.dot);
        img_page3.setImageResource(R.drawable.dot_selected);
        img_page4.setImageResource(R.drawable.dot);
        break;

    case 3:
        img_page1.setImageResource(R.drawable.dot);
        img_page2.setImageResource(R.drawable.dot);
        img_page3.setImageResource(R.drawable.dot);
        img_page4.setImageResource(R.drawable.dot_selected);
        break;

    default:
        break;
    }


            }

            @Override
            public void onPageScrolled(int arg0, float arg1, int arg2) {

            }

            @Override
            public void onPageScrollStateChanged(int arg0) {

            }
        });

Answer 3

我手工解决方案:

在布局中:

<LinearLayout
        android:orientation="horizontal"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/dots"
        />

并在活动中

private final static int NUM_PAGES = 5;
private ViewPager mViewPager;
private List<ImageView> dots;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // ...
    addDots();
}

public void addDots() {
    dots = new ArrayList<>();
    LinearLayout dotsLayout = (LinearLayout)findViewById(R.id.dots);

    for(int i = 0; i < NUM_PAGES; i++) {
        ImageView dot = new ImageView(this);
        dot.setImageDrawable(getResources().getDrawable(R.drawable.pager_dot_not_selected));

        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.WRAP_CONTENT,
                LinearLayout.LayoutParams.WRAP_CONTENT
        );
        dotsLayout.addView(dot, params);

        dots.add(dot);
    }

    mViewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
        }

        @Override
        public void onPageSelected(int position) {
            selectDot(position);
        }

        @Override
        public void onPageScrollStateChanged(int state) {
        }
    });
}

public void selectDot(int idx) {
    Resources res = getResources();
    for(int i = 0; i < NUM_PAGES; i++) {
        int drawableId = (i==idx)?(R.drawable.pager_dot_selected):(R.drawable.pager_dot_not_selected);
        Drawable drawable = res.getDrawable(drawableId);
        dots.get(i).setImageDrawable(drawable);
    }
}

Answer 4

我创建了一个库来满足ViewPager中页面指示器的需求.我的库包含一个名为DotIndicator的视图.要使用我的库,请添加compile 'com.matthew-tamlin:sliding-intro-screen:3.2.0'到gradle构建文件.

可以通过添加以下内容将视图添加到您的布局中:

    <com.matthewtamlin.sliding_intro_screen_library.indicators.DotIndicator
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:numberOfDots=YOUR_INT_HERE
            app:selectedDotIndex=YOUR_INT_HERE/>

上面的代码完美地复制了Google Launcher主屏幕上的点的功能,但是如果您想进一步自定义它,则可以添加以下属性:

• app:unselectedDotDiameter并app:selectedDotDiameter设置点的直径
• app:unselectedDotColor并app:selectedDotColor设置点的颜色
• app:spacingBetweenDots 改变点之间的距离
• app:dotTransitionDuration 设置动画从小到大(和后面)动画的时间

此外,可以使用以下命令以编程方式创建视图:

DotIndicator indicator = new DotIndicator(context);

存在修改属性的方法,类似于属性.要更新指示器以显示所选的其他页面,只需indicator.setSelectedItem(int, true)从内部调用方法ViewPager.OnPageChangeListener.onPageSelected(int).

这是一个使用它的例子:

如果您有兴趣,该库实际上是为了制作如上面的gif所示的介绍屏幕.

Github源代码来自:https://github.com/MatthewTamlin/SlidingIntroScreen

Answer 5

ViewPagerIndicator 自2012年以来没有更新,并得到了一些从未修复的错误.

我终于找到了一个替代这个光库,显示了漂亮的点viewpager,这里是链接:

https://github.com/ongakuer/CircleIndicator

易于实施!

Answer 6

我想为上述问题发布一个更简单的解决方案,并且只需更改一个变量值即可动态更改指标数字dotCounts=x.

1)在drawable文件夹中为名为"item_selected"的页面选择指示器创建一个xml文件.

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval" android:useLevel="true"
    android:dither="true">
    <size android:height="8dp" android:width="8dp"/>
    <solid android:color="@color/image_item_selected_for_dots"/>
</shape>

2)为名为"item_unselected"的未选择指示符再创建一个xml文件

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

    <size android:height="8dp" android:width="8dp"/>

    <solid android:color="@color/image_item_unselected_for_dots"/>
</shape>

3)现在添加将此部分代码添加到要viewPager在Layout XML文件中显示以下指示符的位置.

 <RelativeLayout
        android:id="@+id/viewPagerIndicator"
        android:layout_width="match_parent"
        android:layout_below="@+id/banner_pager"
        android:layout_height="wrap_content"
        android:gravity="center">

        <LinearLayout
            android:id="@+id/viewPagerCountDots"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_centerHorizontal="true"
            android:gravity="center"
            android:orientation="horizontal" />
        </RelativeLayout>

4)在您的布局膨胀或与上述xml文件相关的活动文件文件的顶部添加此功能

private int dotsCount=5;    //No of tabs or images
private ImageView[] dots;
LinearLayout linearLayout;

private void drawPageSelectionIndicators(int mPosition){
    if(linearLayout!=null) {
        linearLayout.removeAllViews();
    }
    linearLayout=(LinearLayout)findViewById(R.id.viewPagerCountDots);
    dots = new ImageView[dotsCount];
    for (int i = 0; i < dotsCount; i++) {
        dots[i] = new ImageView(context);
        if(i==mPosition)
            dots[i].setImageDrawable(getResources().getDrawable(R.drawable.item_selected));
        else
            dots[i].setImageDrawable(getResources().getDrawable(R.drawable.item_unselected));

        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.WRAP_CONTENT,
                LinearLayout.LayoutParams.WRAP_CONTENT
        );

        params.setMargins(4, 0, 4, 0);
        linearLayout.addView(dots[i], params);
    }
}

5)最后在onCreate方法中添加以下代码以引用布局并处理页面选择的位置

drawPageSelectionIndicators(0);
mPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
    }

    @Override
    public void onPageSelected(int position) {
        drawPageSelectionIndicators(position);
    }

    @Override
    public void onPageScrollStateChanged(int state) {
    }
});

Answer 7

你可以试试Jake Wharton的图书馆 - https://github.com/JakeWharton/Android-ViewPagerIndicator

Answer 8

以下是我提出的解决方案.

• 由于我们只需要在视图寻呼机中显示一些图像,因此避免了碎片的繁琐使用.
  • 实现了视图页面指示器(底部点没有任何额外的库或插件)
  • 在触摸视图页面指示符(点)时,页面导航也正在发生.
  • 请不要忘记在资源中添加自己的图像.
  • 随意评论并改进它.

A)以下是我的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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="schneider.carouseladventure.MainActivity">

    <android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/viewpager"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <RelativeLayout
        android:id="@+id/viewPagerIndicator"
        android:layout_width="match_parent"
        android:layout_height="55dp"
        android:layout_alignParentBottom="true"
        android:layout_marginTop="5dp"
        android:gravity="center">

        <LinearLayout
            android:id="@+id/viewPagerCountDots"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_centerHorizontal="true"
            android:gravity="center"
            android:orientation="horizontal" />

    </RelativeLayout>


</RelativeLayout>

B)pager_item.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/imageView" />
</LinearLayout>

C)MainActivity.java

import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.LinearLayout;

public class MainActivity extends AppCompatActivity implements ViewPager.OnPageChangeListener, View.OnClickListener {

    int[] mResources = {R.drawable.nature1, R.drawable.nature2, R.drawable.nature3, R.drawable.nature4,
            R.drawable.nature5, R.drawable.nature6
    };

    ViewPager mViewPager;
    private CustomPagerAdapter mAdapter;
    private LinearLayout pager_indicator;
    private int dotsCount;
    private ImageView[] dots;


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

        mViewPager = (ViewPager) findViewById(R.id.viewpager);
        pager_indicator = (LinearLayout) findViewById(R.id.viewPagerCountDots);
        mAdapter = new CustomPagerAdapter(this, mResources);
        mViewPager.setAdapter(mAdapter);
        mViewPager.setCurrentItem(0);
        mViewPager.setOnPageChangeListener(this);

        setPageViewIndicator();

    }

    private void setPageViewIndicator() {

        Log.d("###setPageViewIndicator", " : called");
        dotsCount = mAdapter.getCount();
        dots = new ImageView[dotsCount];

        for (int i = 0; i < dotsCount; i++) {
            dots[i] = new ImageView(this);
            dots[i].setImageDrawable(getResources().getDrawable(R.drawable.nonselecteditem_dot));

            LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
                    LinearLayout.LayoutParams.WRAP_CONTENT,
                    LinearLayout.LayoutParams.WRAP_CONTENT
            );

            params.setMargins(4, 0, 4, 0);

            final int presentPosition = i;
            dots[presentPosition].setOnTouchListener(new View.OnTouchListener() {

                @Override
                public boolean onTouch(View v, MotionEvent event) {
                    mViewPager.setCurrentItem(presentPosition);
                    return true;
                }

            });


            pager_indicator.addView(dots[i], params);
        }

        dots[0].setImageDrawable(getResources().getDrawable(R.drawable.selecteditem_dot));
    }

    @Override
    public void onClick(View v) {

    }

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

    }

    @Override
    public void onPageSelected(int position) {

        Log.d("###onPageSelected, pos ", String.valueOf(position));
        for (int i = 0; i < dotsCount; i++) {
            dots[i].setImageDrawable(getResources().getDrawable(R.drawable.nonselecteditem_dot));
        }

        dots[position].setImageDrawable(getResources().getDrawable(R.drawable.selecteditem_dot));

        if (position + 1 == dotsCount) {

        } else {

        }
    }

    @Override
    public void onPageScrollStateChanged(int state) {

    }
}

D)CustomPagerAdapter.java

 import android.content.Context;
    import android.support.v4.view.PagerAdapter;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.ImageView;
    import android.widget.LinearLayout;

    public class CustomPagerAdapter extends PagerAdapter {
        private Context mContext;
        LayoutInflater mLayoutInflater;
        private int[] mResources;

        public CustomPagerAdapter(Context context, int[] resources) {
            mContext = context;
            mLayoutInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            mResources = resources;
        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {

            View itemView = mLayoutInflater.inflate(R.layout.pager_item,container,false);
            ImageView imageView = (ImageView) itemView.findViewById(R.id.imageView);
            imageView.setImageResource(mResources[position]);
           /* LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(950, 950);
            imageView.setLayoutParams(layoutParams);*/
            container.addView(itemView);
            return itemView;
        }

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

        @Override
        public int getCount() {
            return mResources.length;
        }

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

E)selecteditem_dot.xml

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

    <size android:height="12dip" android:width="12dip"/>

    <solid android:color="#7e7e7e"/>
</shape>

F)nonselecteditem_dot.xml

 <?xml version="1.0" encoding="utf-8"?>
    <shape xmlns:android="http://schemas.android.com/apk/res/android"
        android:shape="oval" android:useLevel="true"
        android:dither="true">        
        <size android:height="12dip" android:width="12dip"/>        
        <solid android:color="#d3d3d3"/>
    </shape>