Comment créez-vous un Android View Pager avec un indicateur de points?

Question

Beaucoup d’entre vous (comme moi) ont probablement du mal à créer ViewPager avec des points en bas, comme ceci:

Comment créez-vous un tel ViewPager Android?

Answer 1

Tout ce dont nous avons besoin est: ViewPager , TabLayout et 2 tirables pour les points sélectionnés et par défaut.

Tout d’abord, nous devons ajouter TabLayout à notre disposition d’écran et le connecter avec ViewPager. Nous pouvons le faire de deux manières:

---

TabLayout imbriqué dans ViewPager

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

    <Android.support.design.widget.TabLayout
        Android:layout_width="match_parent"
        Android:layout_height="wrap_content"/>
</Android.support.v4.view.ViewPager>

Dans ce cas, TabLayout sera automatiquement connecté à ViewPager, mais TabLayout sera adjacent à ViewPager et non au-dessus.

---

Séparer TabLayout

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

<Android.support.design.widget.TabLayout
    Android:id="@+id/tab_layout"
    Android:layout_width="match_parent"
    Android:layout_height="wrap_content"/>

Dans ce cas, nous pouvons mettre TabLayout n'importe où, mais nous devons connecter TabLayout avec ViewPager par programme

ViewPager pager = (ViewPager) view.findViewById(R.id.photos_viewpager);
PagerAdapter adapter = new PhotosAdapter(getChildFragmentManager(), photosUrl);
pager.setAdapter(adapter);

TabLayout tabLayout = (TabLayout) view.findViewById(R.id.tab_layout);
tabLayout.setupWithViewPager(pager, true);

Une fois que nous avons créé notre mise en page, nous devons préparer nos points. Nous créons donc trois fichiers: selected_dot.xml, default_dot.xml et tab_selector.xml.

---

selected_dot.xml

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

---

default_dot.xml

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

---

tab_selector.xml

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

    <item Android:drawable="@drawable/selected_dot"
          Android:state_selected="true"/>

    <item Android:drawable="@drawable/default_dot"/>
</selector>

---

Nous devons maintenant n’ajouter que 3 lignes de code à TabLayout dans notre structure XML.

app:tabBackground="@drawable/tab_selector"
app:tabGravity="center"
app:tabIndicatorHeight="0dp"

Answer 2

Commencez par créer une mise en page, qui donne un LinerLayout for Dots qui apparaît sur votre View Pager

<RelativeLayout
    Android:layout_width="match_parent"
    Android:layout_height="wrap_content">

    <Android.support.v4.view.ViewPager
        Android:id="@+id/view_pager"
        Android:layout_width="match_parent"
        Android:layout_height="wrap_content"/>


    <LinearLayout
        Android:id="@+id/pager_dots"
        Android:layout_width="match_parent"
        Android:layout_height="wrap_content"
        Android:layout_alignParentBottom="true"
        Android:layout_marginBottom="10dp"
        Android:background="@Android:color/transparent"
        Android:gravity="center_horizontal"
        Android:orientation="horizontal">
    </LinearLayout>

</RelativeLayout>

Après cela créer 2 drawables

1. Non sélectionné Drawable

<?xml version="1.0" encoding="utf-8"?>
<shape Android:shape="oval" xmlns:Android="http://schemas.Android.com/apk/res/Android">
    <solid Android:color="@Android:color/transparent"/>
    <size Android:width="12dp" Android:height="12dp"/>

    <stroke Android:width="1dp" Android:color="#ffffff"/>
</shape>

2. Sélectionnable

<?xml version="1.0" encoding="utf-8"?>
<shape Android:shape="oval" xmlns:Android="http://schemas.Android.com/apk/res/Android">
    <solid Android:color="@Android:color/transparent"/>
    <size Android:width="12dp" Android:height="12dp"/>

    <stroke Android:width="1dp" Android:color="#000000"/>
</shape>

Après que set adaptateur

private LinearLayout llPagerDots;
private ViewPager viewPager;
private ArrayList<String> eventImagesUrl;
private HomeViewPagerAdapter homeViewPagerAdapter;
private ImageView[] ivArrayDotsPager;

public void setUpViewPager() {
    viewPager = (ViewPager) findViewById(R.id.view_pager);
    llPagerDots = (LinearLayout) findViewById(R.id.pager_dots);

    homeViewPagerAdapter = new HomeViewPagerAdapter(mContext, eventImagesUrl);

    viewPager.setAdapter(homeViewPagerAdapter);

    setupPagerIndidcatorDots();

    ivArrayDotsPager[0].setImageResource(R.drawable.page_indicator_selected);

    viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

        }

        @Override
        public void onPageSelected(int position) {
            for (int i = 0; i < ivArrayDotsPager.length; i++) {
                ivArrayDotsPager[i].setImageResource(R.drawable.page_indicator_unselected);
            }
            ivArrayDotsPager[position].setImageResource(R.drawable.page_indicator_selected);
        }

        @Override
        public void onPageScrollStateChanged(int state) {

        }
    });
}

Créer une méthode setupPagerIndidcatorDots ():

private void setupPagerIndidcatorDots() {
    ivArrayDotsPager = new ImageView[eventImagesUrl.size()];
    for (int i = 0; i < ivArrayDotsPager.length; i++) {
        ivArrayDotsPager[i] = new ImageView(getActivity());
        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
        params.setMargins(5, 0, 5, 0);
        ivArrayDotsPager[i].setLayoutParams(params);
        ivArrayDotsPager[i].setImageResource(R.drawable.page_indicator_unselected);
        //ivArrayDotsPager[i].setAlpha(0.4f);
        ivArrayDotsPager[i].setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                view.setAlpha(1);
            }
        });
        llPagerDots.addView(ivArrayDotsPager[i]);
        llPagerDots.bringToFront();
    }

Answer 3

Vous pouvez consulter ma bibliothèque pour traiter votre demande: https://github.com/tommybuonomo/dotsindicator

Dans votre mise en page XML

  <com.tbuonomo.viewpagerdotsindicator.DotsIndicator
      Android:id="@+id/dots_indicator"
      Android:layout_width="wrap_content"
      Android:layout_height="wrap_content"
      Android:layout_centerHorizontal="true"
      app:dotsColor="@color/colorPrimary"
      app:dotsSize="16dp"
      app:dotsWidthFactor="3"
      />

Dans votre code Java

dotsIndicator = (DotsIndicator) findViewById(R.id.dots_indicator);
viewPager = (ViewPager) findViewById(R.id.view_pager);
adapter = new ViewPagerAdapter();
viewPager.setAdapter(adapter);
dotsIndicator.setViewPager(viewPager);

Answer 4

<Android.support.v4.view.ViewPager
      Android:id="@+id/vpImage"
      Android:layout_width="match_parent"
      Android:layout_height="@dimen/_120sdp" />


<Android.support.design.widget.TabLayout
      Android:id="@+id/tlImage"
      Android:layout_width="match_parent"
      Android:layout_height="wrap_content"
      app:tabBackground="@drawable/selector_product_image"
      app:tabGravity="center"
      app:tabIndicatorHeight="0dp"
      app:tabMaxWidth="12dp"
      app:tabRippleColor="@null" />

---

ImageAdapter imageAdapter = new ImageAdapter(context, arrayList);
vpImage.setOffscreenPageLimit(1);
vpImage.setAdapter(imageAdapter);
tlImage.setupWithViewPager(vpImage);

selector_product_image.xml

<selector xmlns:Android="http://schemas.Android.com/apk/res/Android">

    <item Android:drawable="@drawable/image_selected" Android:state_selected="true" />
    <item Android:drawable="@drawable/image_unselected" />

</selector>

image_selected.xml

<layer-list xmlns:Android="http://schemas.Android.com/apk/res/Android">
    <item>
        <shape
            Android:innerRadius="0dp"
            Android:shape="ring"
            Android:thickness="4dp"
            Android:useLevel="false">
            <solid Android:color="@color/colorAccent" />
        </shape>
    </item>
</layer-list>

image_unselected.xml

<layer-list xmlns:Android="http://schemas.Android.com/apk/res/Android">
    <item>
        <shape
            Android:innerRadius="0dp"
            Android:shape="ring"
            Android:thickness="4dp"
            Android:useLevel="false">
            <solid Android:color="@color/colorPrimary" />
        </shape>
    </item>
</layer-list>

ImageAdapter.Java

class ImageAdapter extends PagerAdapter {

  private Context context;
  private ArrayList<ImageModel> arrayList;
  private LayoutInflater layoutInflater;

  public ImageAdapter(Context context, ArrayList<ImageModel> arrayList) {
      this.context = context;
      this.arrayList = arrayList;
      this.layoutInflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
  }

  @Override
  public int getCount() {
      return arrayList.size();
  }

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

  @Override
  public Object instantiateItem(ViewGroup container, int position) {
      View view = layoutInflater.inflate(R.layout.row_slider_image, container, false);

      AppCompatImageView ivProductImage = view.findViewById(R.id.ivProductImage);

      if (!TextUtils.isEmpty(arrayList.get(position).getImage())) {
          Glide.with(context)
                  .load(arrayList.get(position).getImage())
                  .apply(new RequestOptions().placeholder(R.drawable.no_image).error(R.drawable.no_image))
                  .into(ivProductImage);
      }

      container.addView(view);
      return view;
  }

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

row_slider_image.xml

<Android.support.v7.widget.LinearLayoutCompat xmlns:Android="http://schemas.Android.com/apk/res/Android"
    Android:layout_width="match_parent"
    Android:layout_height="match_parent"
    Android:orientation="vertical">

    <Android.support.v7.widget.AppCompatImageView
        Android:id="@+id/ivProductImage"
        Android:layout_width="match_parent"
        Android:layout_height="match_parent"
        Android:src="@drawable/no_image" />

</Android.support.v7.widget.LinearLayoutCompat>

Answer 5

Votre xml

  <RelativeLayout
                Android:id="@+id/rl_speed"
                Android:layout_width="match_parent"
                Android:layout_height="wrap_content"
                Android:layout_above="@+id/ll_dashboard_buttons"
                Android:layout_below="@+id/ib_menu">

                <com.smart.gps.speedometer.app.utils.SmartViewPager
                    Android:id="@+id/view_pager"
                    Android:layout_width="match_parent"
                    Android:layout_height="match_parent" 
                   app:layout_behavior="@string/appbar_scrolling_view_behavior">
                   </com.smart.gps.speedometer.app.utils.SmartViewPager>

                   <Android.support.design.widget.TabLayout
                    Android:id="@+id/sliding_tabs"
                    Android:layout_alignParentBottom="true"
                    Android:layout_width="match_parent"
                    Android:layout_height="wrap_content"
                    app:tabBackground="@drawable/tab_selector"
                    app:tabIndicatorHeight="0dp"
                    app:tabGravity="center"
                    />

créer un drawable. clic droit sur drawable -> new -> Drawable file resourcename ce fichier

tab_selector.xml

<item Android:drawable="@drawable/selected_tab"
    Android:state_selected="true"/>

<item Android:drawable="@drawable/unselected_tab"/>

Maintenant, il y a deux autres fichiers XML. créer deux autres fichiers XML avec un nom respecté. ce sont l'indicateur de sélection et l'indicateur non sélectionné

selected_tab.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:Android="http://schemas.Android.com/apk/res/Android">
    <item>
        <shape
            Android:innerRadius="0dp"
            Android:shape="ring"
            Android:thickness="4dp"
            Android:useLevel="false">
            <solid Android:color="@color/highspeed"/>
        </shape>
    </item>
</layer-list>

unselected_tab.xml

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

Answer 6

Placez ViewFlipper et viewFlipper_linear_dot_lay (Linearlayout) sur la même ligne de base et suivez les instructions ci-dessous.

viewFlipper_linear_dot_lay= (LinearLayout) findViewById(R.id.dots_lay);
setupDotsOnViewPager(images_viewFlipper);
    for (int i = 0; i < images_viewFlipper.size(); i++) {
    //Add Images to ViewFlipper 
    }



private void setupDotsOnViewPager(ArrayList images_viewFlipper) {
                    images_linear = new ImageView[images_viewFlipper.size()];
                    for (int i = 0; i < images_linear.length; i++) {
                        images_linear[i] = new ImageView(this);
                        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
                        params.setMargins(5, 0, 5, 0);
                        params.gravity = Gravity.BOTTOM | Gravity.CENTER;
                        images_linear[i].setLayoutParams(params);
                        images_linear[i].setImageResource(R.drawable.unselected);
                        viewFlipper_linear_dot_lay.addView(images_linear[i]);
                        viewFlipper_linear_dot_lay.bringToFront();
                    }
                }

Et OnRight & OnLeft getsures place le code ci-dessous 

for (int i = 0; i < images_linear.length; i++) {
 images_linear[i].setImageResource(R.drawable.unselected);
 }
images_linear[viewFlipper.getDisplayedChild()].setImageResource(R.drawable.selected);