Создать Настроить Скользящие вкладки

Question

Я новичок в разработке android. В моем проекте я хочу создать скользящие вкладки. Я провел некоторое исследование скользящих вкладок, но не понял, как его настроить. Мои закладки будут выглядеть следующим образом:

Так пожалуйста, вы можете помочь мне о том, как я могу добиться этого?

Answer 1

Сначала вам понадобится «логика» SlidingTabLayout. Вы можете взять его из официальной документации, также я поставлю его здесь. Этот класс должен использоваться внутри ViewPager.

/* 
* Copyright (C) 2013 The Android Open Source Project 
* 
* Licensed under the Apache License, Version 2.0 (the "License"); 
* you may not use this file except in compliance with the License. 
* You may obtain a copy of the License at 
* 
*  http://www.apache.org/licenses/LICENSE-2.0 
* 
* Unless required by applicable law or agreed to in writing, software 
* distributed under the License is distributed on an "AS IS" BASIS, 
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
* See the License for the specific language governing permissions and 
* limitations under the License. 
*/ 


/** 
* 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...)} and {@link #setDividerColors(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); 

    /** 
    * @return return the color of the divider drawn to the right of {@code position}. 
    */ 
    int getDividerColor(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 ViewPager mViewPager; 
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...)} and {@link #setDividerColors(int...)} to achieve 
* similar effects. 
*/ 
public void setCustomTabColorizer(TabColorizer tabColorizer) { 
    mTabStrip.setCustomTabColorizer(tabColorizer); 
} 

/** 
* 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); 
} 

/** 
* Sets the colors to be used for tab dividers. These colors are treated as a circular array. 
* Providing one color will mean that all tabs are indicated with the same color. 
*/ 
public void setDividerColors(int... colors) { 
    mTabStrip.setDividerColors(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); 

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) { 
     // If we're running on Honeycomb or newer, then we can use the Theme's 
     // selectableItemBackground to ensure that the View has a pressed state 
     TypedValue outValue = new TypedValue(); 
     getContext().getTheme().resolveAttribute(android.R.attr.selectableItemBackground, 
       outValue, true); 
     textView.setBackgroundResource(outValue.resourceId); 
    } 

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) { 
     // If we're running on ICS or newer, enable all-caps to match the Action Bar tab style 
     textView.setAllCaps(true); 
    } 

    int padding = (int) (TAB_VIEW_PADDING_DIPS * getResources().getDisplayMetrics().density); 
    textView.setPadding(padding, padding, padding, padding); 
    textView.setTextColor(Color.WHITE); 
    textView.setTextSize(TypedValue.COMPLEX_UNIT_SP, 35); 

    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; 
     } 

     tabTitleView.setText(adapter.getPageTitle(i)); 
     tabView.setOnClickListener(tabClickListener); 

     mTabStrip.addView(tabView); 
    } 
} 

@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); 
     } 

     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; 
      } 
     } 
    } 
} 

}

После этого вам будет нужен еще один класс, который будет определять, как она выглядит ее интерфейс. Это тот класс, который вы должны изменить, чтобы изменить стиль.

/** 
    * Copyright (C) 2013 The Android Open Source Project 
    * 
    * Licensed under the Apache License, Version 2.0 (the "License"); 
    * you may not use this file except in compliance with the License. 
    * You may obtain a copy of the License at 
    * 
    *  http://www.apache.org/licenses/LICENSE-2.0 
    * 
    * Unless required by applicable law or agreed to in writing, software 
    * distributed under the License is distributed on an "AS IS" BASIS, 
    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
    * See the License for the specific language governing permissions and 
    * limitations under the License. 
    */ 



class SlidingTabStrip extends LinearLayout { 

private static final int DEFAULT_BOTTOM_BORDER_THICKNESS_DIPS = 2; 
private static final byte DEFAULT_BOTTOM_BORDER_COLOR_ALPHA = 0x26; 
private static final int SELECTED_INDICATOR_THICKNESS_DIPS = 8; 
private static final int DEFAULT_SELECTED_INDICATOR_COLOR = 0xFF33B5E5; 

private static final int DEFAULT_DIVIDER_THICKNESS_DIPS = 1; 
private static final byte DEFAULT_DIVIDER_COLOR_ALPHA = 0x20; 
private static final float DEFAULT_DIVIDER_HEIGHT = 0.5f; 

private final int mBottomBorderThickness; 
private final Paint mBottomBorderPaint; 

private final int mSelectedIndicatorThickness; 
private final Paint mSelectedIndicatorPaint; 

private final int mDefaultBottomBorderColor; 

private final Paint mDividerPaint; 
private final float mDividerHeight; 

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(R.attr.colorForeground, outValue, true); 
    final int themeForegroundColor = outValue.data; 

    mDefaultBottomBorderColor = setColorAlpha(themeForegroundColor, 
      DEFAULT_BOTTOM_BORDER_COLOR_ALPHA); 

    mDefaultTabColorizer = new SimpleTabColorizer(); 
    mDefaultTabColorizer.setIndicatorColors(DEFAULT_SELECTED_INDICATOR_COLOR); 
    mDefaultTabColorizer.setDividerColors(setColorAlpha(themeForegroundColor, 
      DEFAULT_DIVIDER_COLOR_ALPHA)); 

    mBottomBorderThickness = (int) (DEFAULT_BOTTOM_BORDER_THICKNESS_DIPS * density); 
    mBottomBorderPaint = new Paint(); 
    mBottomBorderPaint.setColor(mDefaultBottomBorderColor); 

    mSelectedIndicatorThickness = (int) (SELECTED_INDICATOR_THICKNESS_DIPS * density); 
    mSelectedIndicatorPaint = new Paint(); 

    mDividerHeight = DEFAULT_DIVIDER_HEIGHT; 
    mDividerPaint = new Paint(); 
    mDividerPaint.setStrokeWidth((int) (DEFAULT_DIVIDER_THICKNESS_DIPS * density)); 
} 

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 setDividerColors(int... colors) { 
    // Make sure that the custom colorizer is removed 
    mCustomTabColorizer = null; 
    mDefaultTabColorizer.setDividerColors(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 int dividerHeightPx = (int) (Math.min(Math.max(0f, mDividerHeight), 1f) * height); 
    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); 

    // Vertical separators between the titles 
    int separatorTop = (height - dividerHeightPx)/2; 
    for (int i = 0; i < childCount - 1; i++) { 
     View child = getChildAt(i); 
     mDividerPaint.setColor(tabColorizer.getDividerColor(i)); 
     canvas.drawLine(child.getRight(), separatorTop, child.getRight(), 
       separatorTop + dividerHeightPx, mDividerPaint); 
    } 
} 

/** 
* 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; 
    private int[] mDividerColors; 

    @Override 
    public final int getIndicatorColor(int position) { 
     return mIndicatorColors[position % mIndicatorColors.length]; 
    } 

    @Override 
    public final int getDividerColor(int position) { 
     return mDividerColors[position % mDividerColors.length]; 
    } 

    void setIndicatorColors(int... colors) { 
     mIndicatorColors = colors; 
    } 

    void setDividerColors(int... colors) { 
     mDividerColors = colors; 
    } 
} 

}