Image Slider Android
-----------activity_main.xml---------------------
--------SliderPagerAdapter.java------------------------
-----------activity_main.xml---------------------
<RelativeLayoutandroid:layout_width="match_parent"android:layout_height="200dp"><android.support.v4.view.ViewPagerandroid:id="@+id/vp_slider"android:layout_width="match_parent"android:layout_height="match_parent" /><LinearLayoutandroid:id="@+id/ll_dots"android:layout_width="match_parent"android:layout_height="30dp"android:layout_alignParentBottom="true"android:layout_marginBottom="20dp"android:gravity="center"android:orientation="horizontal"></LinearLayout></RelativeLayout> public class SliderPagerAdapter extends PagerAdapter {private LayoutInflater layoutInflater; Activity activity; ArrayList<String> image_arraylist; public SliderPagerAdapter(Activity activity, ArrayList<String> image_arraylist) { this.activity = activity; this.image_arraylist = image_arraylist; } @Override public Object instantiateItem(ViewGroup container, int position) { layoutInflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE); View view = layoutInflater.inflate(R.layout.layout_slider, container, false); ImageView im_slider = (ImageView) view.findViewById(R.id.im_slider); Picasso.with(activity.getApplicationContext()) .load(image_arraylist.get(position)) .placeholder(R.mipmap.ic_launcher) // optional .error(R.mipmap.ic_launcher) // optional .into(im_slider); container.addView(view); return view; } @Override public int getCount() { return image_arraylist.size(); } @Override public boolean isViewFromObject(View view, Object obj) { return view == obj; } @Override public void destroyItem(ViewGroup container, int position, Object object) { View view = (View) object; container.removeView(view); }} ----------------layout_slider.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:id="@+id/im_slider" android:layout_width="match_parent" android:layout_height="match_parent" android:scaleType="centerCrop"/></LinearLayout> ----------------MainActivity.java----------------public class MainActivity extends AppCompatActivity{ private ViewPager vp_slider; private LinearLayout ll_dots; SliderPagerAdapter sliderPagerAdapter; ArrayList<String> slider_image_list; private TextView[] dots; int page_position = 0; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); setContentView(R.layout.activity_main);// method for initialisation init();// method for adding indicators addBottomDots(0); final Handler handler = new Handler(); final Runnable update = new Runnable() { public void run() { if (page_position == slider_image_list.size()) { page_position = 0; } else { page_position = page_position + 1; } vp_slider.setCurrentItem(page_position, true); } }; new Timer().schedule(new TimerTask() { @Override public void run() { handler.post(update); } }, 100, 5000); } private void init() { setSupportActionBar((Toolbar) findViewById(R.id.toolbar)); getSupportActionBar().hide(); vp_slider = (ViewPager) findViewById(R.id.vp_slider); ll_dots = (LinearLayout) findViewById(R.id.ll_dots); slider_image_list = new ArrayList<>();//Add few items to slider_image_list ,this should contain url of images which should be displayed in slider// here i am adding few sample image links, you can add your own slider_image_list.add("http://images.all-free-download.com/images/graphiclarge/mountain_bongo_animal_mammal_220289.jpg"); slider_image_list.add("http://images.all-free-download.com/images/graphiclarge/bird_mountain_bird_animal_226401.jpg"); slider_image_list.add("http://images.all-free-download.com/images/graphiclarge/mountain_bongo_animal_mammal_220289.jpg"); slider_image_list.add("http://images.all-free-download.com/images/graphiclarge/bird_mountain_bird_animal_226401.jpg"); sliderPagerAdapter = new SliderPagerAdapter(MainActivity.this, slider_image_list); vp_slider.setAdapter(sliderPagerAdapter); vp_slider.setOnPageChangeListener(new ViewPager.OnPageChangeListener() { @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { } @Override public void onPageSelected(int position) { addBottomDots(position); } @Override public void onPageScrollStateChanged(int state) { } }); } private void addBottomDots(int currentPage) { dots = new TextView[slider_image_list.size()]; ll_dots.removeAllViews(); for (int i = 0; i < dots.length; i++) { dots[i] = new TextView(this); dots[i].setText(Html.fromHtml("•")); dots[i].setTextSize(35); dots[i].setTextColor(Color.parseColor("#000000")); ll_dots.addView(dots[i]); } if (dots.length > 0) dots[currentPage].setTextColor(Color.parseColor("#FFFFFF")); }} ------------------build.gradle file------------------ compile 'com.squareup.picasso:picasso:2.3.3' 
