Tutorial Membuat Sliding Tab Layout Android Studio

Hallo berjumpa lagi di tutorial android untuk pemula. Pada kesempatan kali ini Jember Developer akan membahasa tentang Sliding Tab Layout, kebanyakan aplikasi android sudah menerapkan sliding tab layout ini seperti aplikasi Facebook, Blackberry Messangger, Whatsapp dan masih banyak yang lain juga. Sliding tab layout memudahkan pengguna untuk berpindah dari suatu tampilan.Baiklah kita langsung saja ke tutorialnya.
  1. Buka projek yang sudah kita buat sebelumnya! Silahkan baca posting tentang Tutorial Material Design dan Tutorial Toolbar.
  2. Buat class baru caranya klik kanan pada package name > New > Java Class.
  3. Berinama dengan SlidingTabLayout, lalu salin kode di bawah ini.
  4.  import android.content.Context;
    import android.graphics.Typeface;
    import android.support.v4.view.PagerAdapter;
    import android.support.v4.view.ViewPager;
    import android.util.AttributeSet;
    import android.util.SparseArray;
    import android.util.TypedValue;
    import android.view.Gravity;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.HorizontalScrollView;
    import android.widget.LinearLayout;
    import android.widget.TextView;
    
    /**
     * To be used with ViewPager to provide a tab indicator component which give constant feedback as to
     * the user's scroll progress.
     * <p>
     * To use the component, simply add it to your view hierarchy. Then in your
     * {@link android.app.Activity} or {@link android.support.v4.app.Fragment} call
     * {@link #setViewPager(ViewPager)} providing it the ViewPager this layout is being used for.
     * <p>
     * The colors can be customized in two ways. The first and simplest is to provide an array of colors
     * via {@link #setSelectedIndicatorColors(int...)}. The
     * alternative is via the {@link TabColorizer} interface which provides you complete control over
     * which color is used for any individual position.
     * <p>
     * The views used as tabs can be customized by calling {@link #setCustomTabView(int, int)},
     * providing the layout ID of your custom layout.
     */
    public class SlidingTabLayout extends HorizontalScrollView {
        /**
         * Allows complete control over the colors drawn in the tab layout. Set with
         * {@link #setCustomTabColorizer(TabColorizer)}.
         */
        public interface TabColorizer {
    
            /**
             * @return return the color of the indicator used when {@code position} is selected.
             */
            int getIndicatorColor(int position);
    
        }
    
        private static final int TITLE_OFFSET_DIPS = 24;
        private static final int TAB_VIEW_PADDING_DIPS = 16;
        private static final int TAB_VIEW_TEXT_SIZE_SP = 12;
    
        private int mTitleOffset;
    
        private int mTabViewLayoutId;
        private int mTabViewTextViewId;
        private boolean mDistributeEvenly;
    
        private ViewPager mViewPager;
        private SparseArray<String> mContentDescriptions = new SparseArray<String>();
        private ViewPager.OnPageChangeListener mViewPagerPageChangeListener;
    
        private final SlidingTabStrip mTabStrip;
    
        public SlidingTabLayout(Context context) {
            this(context, null);
        }
    
        public SlidingTabLayout(Context context, AttributeSet attrs) {
            this(context, attrs, 0);
        }
    
        public SlidingTabLayout(Context context, AttributeSet attrs, int defStyle) {
            super(context, attrs, defStyle);
    
            // Disable the Scroll Bar
            setHorizontalScrollBarEnabled(false);
            // Make sure that the Tab Strips fills this View
            setFillViewport(true);
    
            mTitleOffset = (int) (TITLE_OFFSET_DIPS * getResources().getDisplayMetrics().density);
    
            mTabStrip = new SlidingTabStrip(context);
            addView(mTabStrip, LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
        }
    
        /**
         * Set the custom {@link TabColorizer} to be used.
         *
         * If you only require simple custmisation then you can use
         * {@link #setSelectedIndicatorColors(int...)} to achieve
         * similar effects.
         */
        public void setCustomTabColorizer(TabColorizer tabColorizer) {
            mTabStrip.setCustomTabColorizer(tabColorizer);
        }
    
        public void setDistributeEvenly(boolean distributeEvenly) {
            mDistributeEvenly = distributeEvenly;
        }
    
        /**
         * Sets the colors to be used for indicating the selected tab. These colors are treated as a
         * circular array. Providing one color will mean that all tabs are indicated with the same color.
         */
        public void setSelectedIndicatorColors(int... colors) {
            mTabStrip.setSelectedIndicatorColors(colors);
        }
    
        /**
         * Set the {@link ViewPager.OnPageChangeListener}. When using {@link SlidingTabLayout} you are
         * required to set any {@link ViewPager.OnPageChangeListener} through this method. This is so
         * that the layout can update it's scroll position correctly.
         *
         * @see ViewPager#setOnPageChangeListener(ViewPager.OnPageChangeListener)
         */
        public void setOnPageChangeListener(ViewPager.OnPageChangeListener listener) {
            mViewPagerPageChangeListener = listener;
        }
    
        /**
         * Set the custom layout to be inflated for the tab views.
         *
         * @param layoutResId Layout id to be inflated
         * @param textViewId id of the {@link TextView} in the inflated view
         */
        public void setCustomTabView(int layoutResId, int textViewId) {
            mTabViewLayoutId = layoutResId;
            mTabViewTextViewId = textViewId;
        }
    
        /**
         * Sets the associated view pager. Note that the assumption here is that the pager content
         * (number of tabs and tab titles) does not change after this call has been made.
         */
        public void setViewPager(ViewPager viewPager) {
            mTabStrip.removeAllViews();
    
            mViewPager = viewPager;
            if (viewPager != null) {
                viewPager.setOnPageChangeListener(new InternalViewPagerListener());
                populateTabStrip();
            }
        }
    
        /**
         * Create a default view to be used for tabs. This is called if a custom tab view is not set via
         * {@link #setCustomTabView(int, int)}.
         */
        protected TextView createDefaultTabView(Context context) {
            TextView textView = new TextView(context);
            textView.setGravity(Gravity.CENTER);
            textView.setTextSize(TypedValue.COMPLEX_UNIT_SP, TAB_VIEW_TEXT_SIZE_SP);
            textView.setTypeface(Typeface.DEFAULT_BOLD);
            textView.setLayoutParams(new LinearLayout.LayoutParams(
                    ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
    
            TypedValue outValue = new TypedValue();
            getContext().getTheme().resolveAttribute(android.R.attr.selectableItemBackground,
                    outValue, true);
            textView.setBackgroundResource(outValue.resourceId);
            textView.setAllCaps(true);
    
            int padding = (int) (TAB_VIEW_PADDING_DIPS * getResources().getDisplayMetrics().density);
            textView.setPadding(padding, padding, padding, padding);
    
            return textView;
        }
    
        private void populateTabStrip() {
            final PagerAdapter adapter = mViewPager.getAdapter();
            final View.OnClickListener tabClickListener = new TabClickListener();
    
            for (int i = 0; i < adapter.getCount(); i++) {
                View tabView = null;
                TextView tabTitleView = null;
    
                if (mTabViewLayoutId != 0) {
                    // If there is a custom tab view layout id set, try and inflate it
                    tabView = LayoutInflater.from(getContext()).inflate(mTabViewLayoutId, mTabStrip,
                            false);
                    tabTitleView = (TextView) tabView.findViewById(mTabViewTextViewId);
                }
    
                if (tabView == null) {
                    tabView = createDefaultTabView(getContext());
                }
    
                if (tabTitleView == null && TextView.class.isInstance(tabView)) {
                    tabTitleView = (TextView) tabView;
                }
    
                if (mDistributeEvenly) {
                    LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) tabView.getLayoutParams();
                    lp.width = 0;
                    lp.weight = 1;
                }
    
                tabTitleView.setText(adapter.getPageTitle(i));
                tabView.setOnClickListener(tabClickListener);
                String desc = mContentDescriptions.get(i, null);
                if (desc != null) {
                    tabView.setContentDescription(desc);
                }
    
                mTabStrip.addView(tabView);
                if (i == mViewPager.getCurrentItem()) {
                    tabView.setSelected(true);
                }
            }
        }
    
        public void setContentDescription(int i, String desc) {
            mContentDescriptions.put(i, desc);
        }
    
        @Override
        protected void onAttachedToWindow() {
            super.onAttachedToWindow();
    
            if (mViewPager != null) {
                scrollToTab(mViewPager.getCurrentItem(), 0);
            }
        }
    
        private void scrollToTab(int tabIndex, int positionOffset) {
            final int tabStripChildCount = mTabStrip.getChildCount();
            if (tabStripChildCount == 0 || tabIndex < 0 || tabIndex >= tabStripChildCount) {
                return;
            }
    
            View selectedChild = mTabStrip.getChildAt(tabIndex);
            if (selectedChild != null) {
                int targetScrollX = selectedChild.getLeft() + positionOffset;
    
                if (tabIndex > 0 || positionOffset > 0) {
                    // If we're not at the first child and are mid-scroll, make sure we obey the offset
                    targetScrollX -= mTitleOffset;
                }
    
                scrollTo(targetScrollX, 0);
            }
        }
    
        private class InternalViewPagerListener implements ViewPager.OnPageChangeListener {
            private int mScrollState;
    
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
                int tabStripChildCount = mTabStrip.getChildCount();
                if ((tabStripChildCount == 0) || (position < 0) || (position >= tabStripChildCount)) {
                    return;
                }
    
                mTabStrip.onViewPagerPageChanged(position, positionOffset);
    
                View selectedTitle = mTabStrip.getChildAt(position);
                int extraOffset = (selectedTitle != null)
                        ? (int) (positionOffset * selectedTitle.getWidth())
                        : 0;
                scrollToTab(position, extraOffset);
    
                if (mViewPagerPageChangeListener != null) {
                    mViewPagerPageChangeListener.onPageScrolled(position, positionOffset,
                            positionOffsetPixels);
                }
            }
    
            @Override
            public void onPageScrollStateChanged(int state) {
                mScrollState = state;
    
                if (mViewPagerPageChangeListener != null) {
                    mViewPagerPageChangeListener.onPageScrollStateChanged(state);
                }
            }
    
            @Override
            public void onPageSelected(int position) {
                if (mScrollState == ViewPager.SCROLL_STATE_IDLE) {
                    mTabStrip.onViewPagerPageChanged(position, 0f);
                    scrollToTab(position, 0);
                }
                for (int i = 0; i < mTabStrip.getChildCount(); i++) {
                    mTabStrip.getChildAt(i).setSelected(position == i);
                }
                if (mViewPagerPageChangeListener != null) {
                    mViewPagerPageChangeListener.onPageSelected(position);
                }
            }
    
        }
    
        private class TabClickListener implements View.OnClickListener {
            @Override
            public void onClick(View v) {
                for (int i = 0; i < mTabStrip.getChildCount(); i++) {
                    if (v == mTabStrip.getChildAt(i)) {
                        mViewPager.setCurrentItem(i);
                        return;
                    }
                }
            }
        }
    
    } 
  5. Buat class baru lagi, berinama dengan SlidingTabStrip lalu salin kode berikut ini.
  6.  import android.content.Context;
    import android.graphics.Canvas;
    import android.graphics.Color;
    import android.graphics.Paint;
    import android.util.AttributeSet;
    import android.util.TypedValue;
    import android.view.View;
    import android.widget.LinearLayout;
    
    class SlidingTabStrip extends LinearLayout {
    
        private static final int DEFAULT_BOTTOM_BORDER_THICKNESS_DIPS = 0;
        private static final byte DEFAULT_BOTTOM_BORDER_COLOR_ALPHA = 0x26;
        private static final int SELECTED_INDICATOR_THICKNESS_DIPS = 3;
        private static final int DEFAULT_SELECTED_INDICATOR_COLOR = 0xFF33B5E5;
    
        private final int mBottomBorderThickness;
        private final Paint mBottomBorderPaint;
    
        private final int mSelectedIndicatorThickness;
        private final Paint mSelectedIndicatorPaint;
    
        private int mSelectedPosition;
        private float mSelectionOffset;
    
        private SlidingTabLayout.TabColorizer mCustomTabColorizer;
        private final SimpleTabColorizer mDefaultTabColorizer;
    
        SlidingTabStrip(Context context) {
            this(context, null);
        }
    
        SlidingTabStrip(Context context, AttributeSet attrs) {
            super(context, attrs);
            setWillNotDraw(false);
    
            final float density = getResources().getDisplayMetrics().density;
    
            TypedValue outValue = new TypedValue();
            context.getTheme().resolveAttribute(android.R.attr.colorForeground, outValue, true);
            final int themeForegroundColor =  outValue.data;
    
            int defaultBottomBorderColor = setColorAlpha(themeForegroundColor,
                    DEFAULT_BOTTOM_BORDER_COLOR_ALPHA);
    
            mDefaultTabColorizer = new SimpleTabColorizer();
            mDefaultTabColorizer.setIndicatorColors(DEFAULT_SELECTED_INDICATOR_COLOR);
    
            mBottomBorderThickness = (int) (DEFAULT_BOTTOM_BORDER_THICKNESS_DIPS * density);
            mBottomBorderPaint = new Paint();
            mBottomBorderPaint.setColor(defaultBottomBorderColor);
    
            mSelectedIndicatorThickness = (int) (SELECTED_INDICATOR_THICKNESS_DIPS * density);
            mSelectedIndicatorPaint = new Paint();
        }
    
        void setCustomTabColorizer(SlidingTabLayout.TabColorizer customTabColorizer) {
            mCustomTabColorizer = customTabColorizer;
            invalidate();
        }
    
        void setSelectedIndicatorColors(int... colors) {
            // Make sure that the custom colorizer is removed
            mCustomTabColorizer = null;
            mDefaultTabColorizer.setIndicatorColors(colors);
            invalidate();
        }
    
        void onViewPagerPageChanged(int position, float positionOffset) {
            mSelectedPosition = position;
            mSelectionOffset = positionOffset;
            invalidate();
        }
    
        @Override
        protected void onDraw(Canvas canvas) {
            final int height = getHeight();
            final int childCount = getChildCount();
            final SlidingTabLayout.TabColorizer tabColorizer = mCustomTabColorizer != null
                    ? mCustomTabColorizer
                    : mDefaultTabColorizer;
    
            // Thick colored underline below the current selection
            if (childCount > 0) {
                View selectedTitle = getChildAt(mSelectedPosition);
                int left = selectedTitle.getLeft();
                int right = selectedTitle.getRight();
                int color = tabColorizer.getIndicatorColor(mSelectedPosition);
    
                if (mSelectionOffset > 0f && mSelectedPosition < (getChildCount() - 1)) {
                    int nextColor = tabColorizer.getIndicatorColor(mSelectedPosition + 1);
                    if (color != nextColor) {
                        color = blendColors(nextColor, color, mSelectionOffset);
                    }
    
                    // Draw the selection partway between the tabs
                    View nextTitle = getChildAt(mSelectedPosition + 1);
                    left = (int) (mSelectionOffset * nextTitle.getLeft() +
                            (1.0f - mSelectionOffset) * left);
                    right = (int) (mSelectionOffset * nextTitle.getRight() +
                            (1.0f - mSelectionOffset) * right);
                }
    
                mSelectedIndicatorPaint.setColor(color);
    
                canvas.drawRect(left, height - mSelectedIndicatorThickness, right,
                        height, mSelectedIndicatorPaint);
            }
    
            // Thin underline along the entire bottom edge
            canvas.drawRect(0, height - mBottomBorderThickness, getWidth(), height, mBottomBorderPaint);
        }
    
        /**
         * Set the alpha value of the {@code color} to be the given {@code alpha} value.
         */
        private static int setColorAlpha(int color, byte alpha) {
            return Color.argb(alpha, Color.red(color), Color.green(color), Color.blue(color));
        }
    
        /**
         * Blend {@code color1} and {@code color2} using the given ratio.
         *
         * @param ratio of which to blend. 1.0 will return {@code color1}, 0.5 will give an even blend,
         *              0.0 will return {@code color2}.
         */
        private static int blendColors(int color1, int color2, float ratio) {
            final float inverseRation = 1f - ratio;
            float r = (Color.red(color1) * ratio) + (Color.red(color2) * inverseRation);
            float g = (Color.green(color1) * ratio) + (Color.green(color2) * inverseRation);
            float b = (Color.blue(color1) * ratio) + (Color.blue(color2) * inverseRation);
            return Color.rgb((int) r, (int) g, (int) b);
        }
    
        private static class SimpleTabColorizer implements SlidingTabLayout.TabColorizer {
            private int[] mIndicatorColors;
    
            @Override
            public final int getIndicatorColor(int position) {
                return mIndicatorColors[position % mIndicatorColors.length];
            }
    
            void setIndicatorColors(int... colors) {
                mIndicatorColors = colors;
            }
        }
    }
     
  7. Setelah itu buka activity_satu.xml lalu tambahkan kode berikut di bawah kode Toolbar.
  8.  <com.developer.jember.jdapps.Tabs.SlidingTabLayout
            android:id="@+id/tabs"
            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="0dp"
            android:layout_weight="1"/> 
    Ubah com.developer.jember.jdapps.Tabs.SlidingTabLayout sesuai dengan nama package sobat. 
  9. Buka ActivitySatu.java lalu tambahkan kode berikut ini di bawah kode private Toolbar toolbar.
  10.  private ViewPager mPager;
    private SlidingTabLayout mTabs; 
  11. Masih di ActivitySatu.java tambahkan kode Sliding Tab berikut kedalam onCreate method.
  12.  @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_satu);
        //toolbar
        toolbar= (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
    
        //Sliding Tab
        mPager = (ViewPager) findViewById(R.id.pager);
        mPager.setAdapter(new MyAdapter(getSupportFragmentManager(),this));
    
        mTabs= (SlidingTabLayout) findViewById(R.id.tabs);
        mTabs.setDistributeEvenly(true);
        mTabs.setCustomTabView(R.layout.tab_view, R.id.tabTeks);
        mTabs.setBackgroundColor(getResources().getColor(R.color.colorPrimary));
        mTabs.setSelectedIndicatorColors(getResources().getColor(R.color.colorAccent));
        mTabs.setViewPager(mPager);
    }
     
  13. Buta class baru dengan nama MyAdapter lalu salin kode berikut ini.
  14.  import android.content.Context;
    import android.graphics.drawable.Drawable;
    import android.os.Bundle;
    import android.support.v4.app.Fragment;
    import android.support.v4.app.FragmentManager;
    import android.support.v4.app.FragmentPagerAdapter;
    import android.text.SpannableString;
    import android.text.Spanned;
    import android.text.style.ImageSpan;
    
    public class MyAdapter extends FragmentPagerAdapter {
        private Context mContext;
        private String[] titles={"OVERVIEW","PORTOFOLIO","TEAM"};
        int[] icons= new int[]{R.mipmap.ic_info_white_48dp,R.mipmap.ic_perm_contact_cal_white_48dp,R.mipmap.ic_account_child_white_48dp};
        private int heightIcon;
    
        public MyAdapter(FragmentManager fm, Context c) {
            super(fm);
            mContext=c;
            double scale=c.getResources().getDisplayMetrics().density;
            heightIcon=(int)(26*scale+0.5f);
        }
    
        @Override
        public Fragment getItem(int position) {
            Fragment frag=null;
            if (position==0){
                frag=new OverviewFragment();
            } else if (position==1){
                frag=new PortofolioFragment();
            } else if (position==2){
                frag=new TeamFragment();
            }
    
            Bundle b = new Bundle();
            b.putInt("position",position);
            frag.setArguments(b);
            return frag;
        }
    
        @Override
        public int getCount() {
            return titles.length;
        }
    
        @Override
        public CharSequence getPageTitle(int position) {
            Drawable d = mContext.getResources().getDrawable(icons[position]);
            d.setBounds(0,0,heightIcon,heightIcon);
    
            ImageSpan is = new ImageSpan(d);
    
            SpannableString sp = new SpannableString(" ");
            sp.setSpan(is,0,sp.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
    
            return (sp);
        }
    } 
    R.mipmap.ic_info_white_48dp,R.mipmap.ic_perm_contact_cal_white_48dp,R.mipmap.ic_account_child_white_48dp adalah kode untuk icon.
  15. Langkah selanjutnya buat tiga fragment. Caranya klik kanan di package name > New  > Fragment > Fragment (Blank). Jangan lupa uncheck Include fragment factory methods dan include interface callbacks.
    Tutorial Membuat Sliding Tab Layout Android Studio #Part 3
  16. Buka semua fragment lalu ubah kode import android.app.Fragment menjadi seperti berikut ini.
  17.  import android.support.v4.app.Fragment; 
  18. Sekarang kita tambahkan ripple effect ketik mengklik tab. Klik kanan di direktori drawable > New > Drawable resource file dan berinama tab_bg. Salin kode berikut ini.
  19.  <?xml version="1.0" encoding="utf-8"?>
    <selector xmlns:android="http://schemas.android.com/apk/res/android">
        <item android:state_pressed="true">
            <shape>
                <solid android:color="@color/colorHighlight"></solid>
            </shape>
        </item>
        <item>
            <shape>
                <solid android:color="@color/colorPrimary"/>
            </shape>
        </item>
    </selector> 
  20. Lakukan lagi klik kanan di direktori drawable > New > Drawable resource file dan berinama tab_bg pada Directory name ubah menjadi drawable-v21. Lalu salin kode berikut ini.
  21.  <?xml version="1.0" encoding="utf-8"?>
    <ripple xmlns:android="http://schemas.android.com/apk/res/android"
        android:color="?android:attr/colorControlHighlight">
        <item
            android:id="@android:id/mask"
            android:drawable="@android:color/white"></item>
    </ripple> 
  22. Sekarang coba jalankan aplikasinya.
    Tutorial Membuat Sliding Tab Layout Android Studio #Part 3

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