Wyświetl wskaźnik pager Jake Wharton

Question

Korzystam z przykładu Jake'a Whartona do wyświetlania wskaźnika strony podglądu. www.viewpagerindicator.com

Używam wskaźnika koła przyciągania.

Czy ktoś może mi powiedzieć, jak zwiększyć szerokość między okręgami?

Jaki parametr należy zmienić?

Answer 1

Możesz znaleźć wszystkie parametry w pliku res/values ​​/ vpi_attrs.xml. Styl związane z CirclePageIndicator określone: ​​

<!-- Radius of the circles. This is also the spacing between circles. --> 
<attr name="radius" format="dimension" /> 

To nie jest możliwe, aby zmienić odstęp między dwoma okręgu. Musisz podklasy CirclePageIndicator:

• tworzyć YourCirclePageIndicator w projekcie
• dodać nowy Attribut gapCircle
• przesłanianie OnDraw metody i zmienić obliczeniową shortOffset/longOffset

Answer 2

Musimy zwiększyć " threeRadius "parametr do wyższej wartości. Dzięki.

Answer 3

połączeń CirclePageIndicator.setRadius()

Answer 4

wiem, jest to stara sprawa, ale dla innych, którzy mogą napotkasz tego problemu w przyszłości, myślałem, że lepiej dodawać go.
Po prostu zwiększenie parametru "threeRadius" do wyższej wartości nie spowoduje, ponieważ spowoduje to centrowanie okręgów.

Więc tutaj jest zmodyfikowaną wersją CirclePageIndicator klasy:

import android.content.Context; 
import android.content.res.Resources; 
import android.content.res.TypedArray; 
import android.graphics.Canvas; 
import android.graphics.Paint; 
import android.graphics.Paint.Style; 
import android.graphics.drawable.Drawable; 
import android.os.Parcel; 
import android.os.Parcelable; 
import android.support.v4.view.MotionEventCompat; 
import android.support.v4.view.ViewConfigurationCompat; 
import android.support.v4.view.ViewPager; 
import android.util.AttributeSet; 
import android.view.MotionEvent; 
import android.view.View; 
import android.view.ViewConfiguration; 

import com.viewpagerindicator.PageIndicator; 

import static android.graphics.Paint.ANTI_ALIAS_FLAG; 
import static android.widget.LinearLayout.HORIZONTAL; 
import static android.widget.LinearLayout.VERTICAL; 


/** 
* Draws circles (one for each view). The current view position is filled and 
* others are only stroked. 
*/ 
public class CirclePageIndicator extends View implements PageIndicator { 
    private static final int INVALID_POINTER = -1; 

    private float mRadius; 
    private final Paint mPaintPageFill = new Paint(ANTI_ALIAS_FLAG); 
    private final Paint mPaintStroke = new Paint(ANTI_ALIAS_FLAG); 
    private final Paint mPaintFill = new Paint(ANTI_ALIAS_FLAG); 
    private ViewPager mViewPager; 
    private ViewPager.OnPageChangeListener mListener; 
    private int mCurrentPage; 
    private int mSnapPage; 
    private float mPageOffset; 
    private int mScrollState; 
    private int mOrientation; 
    private boolean mCentered; 
    private boolean mSnap; 

    private int mTouchSlop; 
    private float mLastMotionX = -1; 
    private int mActivePointerId = INVALID_POINTER; 
    private boolean mIsDragging; 
    private int distanceBetweenCircles = 20; 


    public CirclePageIndicator(Context context) { 
     this(context, null); 
    } 

    public CirclePageIndicator(Context context, AttributeSet attrs) { 
     this(context, attrs, R.attr.vpiCirclePageIndicatorStyle); 
    } 

    public CirclePageIndicator(Context context, AttributeSet attrs, int defStyle) { 
     super(context, attrs, defStyle); 
     if (isInEditMode()) return; 

     //Load defaults from resources 
     final Resources res = getResources(); 
     final int defaultPageColor = res.getColor(R.color.default_circle_indicator_page_color); 
     final int defaultFillColor = res.getColor(R.color.default_circle_indicator_fill_color); 
     final int defaultOrientation = res.getInteger(R.integer.default_circle_indicator_orientation); 
     final int defaultStrokeColor = res.getColor(R.color.default_circle_indicator_stroke_color); 
     final float defaultStrokeWidth = res.getDimension(R.dimen.default_circle_indicator_stroke_width); 
     final float defaultRadius = res.getDimension(R.dimen.default_circle_indicator_radius); 
     final boolean defaultCentered = res.getBoolean(R.bool.default_circle_indicator_centered); 
     final boolean defaultSnap = res.getBoolean(R.bool.default_circle_indicator_snap); 

     //Retrieve styles attributes 
     TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CirclePageIndicator, defStyle, 0); 

     mCentered = a.getBoolean(R.styleable.CirclePageIndicator_centered, defaultCentered); 
     mOrientation = a.getInt(R.styleable.CirclePageIndicator_android_orientation, defaultOrientation); 
     mPaintPageFill.setStyle(Style.FILL); 
     mPaintPageFill.setColor(a.getColor(R.styleable.CirclePageIndicator_pageColor, defaultPageColor)); 
     mPaintStroke.setStyle(Style.STROKE); 
     mPaintStroke.setColor(a.getColor(R.styleable.CirclePageIndicator_strokeColor, defaultStrokeColor)); 
     mPaintStroke.setStrokeWidth(a.getDimension(R.styleable.CirclePageIndicator_strokeWidth, defaultStrokeWidth)); 
     mPaintFill.setStyle(Style.FILL); 
     mPaintFill.setColor(a.getColor(R.styleable.CirclePageIndicator_fillColor, defaultFillColor)); 
     mRadius = a.getDimension(R.styleable.CirclePageIndicator_radius, defaultRadius); 
     mSnap = a.getBoolean(R.styleable.CirclePageIndicator_snap, defaultSnap); 

     distanceBetweenCircles = getResources().getDimensionPixelSize(R.dimen._40); 

     Drawable background = a.getDrawable(R.styleable.CirclePageIndicator_android_background); 
     if (background != null) { 
      setBackgroundDrawable(background); 
     } 

     a.recycle(); 

     final ViewConfiguration configuration = ViewConfiguration.get(context); 
     mTouchSlop = ViewConfigurationCompat.getScaledPagingTouchSlop(configuration); 
    } 


    public void setCentered(boolean centered) { 
     mCentered = centered; 
     invalidate(); 
    } 

    public boolean isCentered() { 
     return mCentered; 
    } 

    public void setPageColor(int pageColor) { 
     mPaintPageFill.setColor(pageColor); 
     invalidate(); 
    } 

    public int getPageColor() { 
     return mPaintPageFill.getColor(); 
    } 

    public void setFillColor(int fillColor) { 
     mPaintFill.setColor(fillColor); 
     invalidate(); 
    } 

    public int getFillColor() { 
     return mPaintFill.getColor(); 
    } 

    public void setOrientation(int orientation) { 
     switch (orientation) { 
      case HORIZONTAL: 
      case VERTICAL: 
       mOrientation = orientation; 
       requestLayout(); 
       break; 

      default: 
       throw new IllegalArgumentException("Orientation must be either HORIZONTAL or VERTICAL."); 
     } 
    } 

    public int getOrientation() { 
     return mOrientation; 
    } 

    public void setStrokeColor(int strokeColor) { 
     mPaintStroke.setColor(strokeColor); 
     invalidate(); 
    } 

    public int getStrokeColor() { 
     return mPaintStroke.getColor(); 
    } 

    public void setStrokeWidth(float strokeWidth) { 
     mPaintStroke.setStrokeWidth(strokeWidth); 
     invalidate(); 
    } 

    public float getStrokeWidth() { 
     return mPaintStroke.getStrokeWidth(); 
    } 

    public void setRadius(float radius) { 
     mRadius = radius; 
     invalidate(); 
    } 

    public float getRadius() { 
     return mRadius; 
    } 

    public void setSnap(boolean snap) { 
     mSnap = snap; 
     invalidate(); 
    } 

    public boolean isSnap() { 
     return mSnap; 
    } 

    @Override 
    protected void onDraw(Canvas canvas) { 
     super.onDraw(canvas); 

     if (mViewPager == null) { 
      return; 
     } 
     final int count = mViewPager.getAdapter().getCount(); 
     if (count == 0) { 
      return; 
     } 

     if (mCurrentPage >= count) { 
      setCurrentItem(count - 1); 
      return; 
     } 

     int longSize; 
     int shortPaddingBefore; 
     if (mOrientation == HORIZONTAL) { 
      longSize = getWidth(); 
      shortPaddingBefore = getPaddingTop(); 
     } else { 
      longSize = getHeight(); 
      shortPaddingBefore = getPaddingLeft(); 
     } 

     final float neededSpaceForCircles = (mRadius * 2 * count + distanceBetweenCircles * (count - 1)); 
     final float startX = (longSize - neededSpaceForCircles)/2f + mRadius; 
     final float shortOffset = shortPaddingBefore + mRadius; 

     float dX; 
     float dY; 

     float pageFillRadius = mRadius; 
     if (mPaintStroke.getStrokeWidth() > 0) { 
      pageFillRadius -= mPaintStroke.getStrokeWidth()/2.0f; 
     } 

     //Draw stroked circles 
     for (int iLoop = 0; iLoop < count; iLoop++) { 
      float drawLong = startX + iLoop * (distanceBetweenCircles + 2 * mRadius); 

      if (mOrientation == HORIZONTAL) { 
       dX = drawLong; 
       dY = shortOffset; 
      } else { 
       dX = shortOffset; 
       dY = drawLong; 
      } 
      // Only paint fill if not completely transparent 
      if (mPaintPageFill.getAlpha() > 0) { 
       canvas.drawCircle(dX, dY, pageFillRadius, mPaintPageFill); 
      } 

      // Only paint stroke if a stroke width was non-zero 
      if (pageFillRadius != mRadius) { 
       canvas.drawCircle(dX, dY, mRadius, mPaintStroke); 
      } 
     } 

     //Draw the filled circle according to the current scroll 
     float cx = (mSnap ? mSnapPage : mCurrentPage) * (distanceBetweenCircles + 2 * mRadius); 
     if (!mSnap) { 
      cx += mPageOffset * distanceBetweenCircles; 
     } 
     if (mOrientation == HORIZONTAL) { 
      dX = startX + cx; 
      dY = shortOffset; 
     } else { 
      dX = shortOffset; 
      dY = startX + cx; 
     } 

     canvas.drawCircle(dX, dY, mRadius, mPaintFill); 
    } 

    public boolean onTouchEvent(android.view.MotionEvent ev) { 
     if (super.onTouchEvent(ev)) { 
      return true; 
     } 
     if ((mViewPager == null) || (mViewPager.getAdapter().getCount() == 0)) { 
      return false; 
     } 

     final int action = ev.getAction() & MotionEventCompat.ACTION_MASK; 
     switch (action) { 
      case MotionEvent.ACTION_DOWN: 
       mActivePointerId = MotionEventCompat.getPointerId(ev, 0); 
       mLastMotionX = ev.getX(); 
       break; 

      case MotionEvent.ACTION_MOVE: { 
       final int activePointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId); 
       final float x = MotionEventCompat.getX(ev, activePointerIndex); 
       final float deltaX = x - mLastMotionX; 

       if (!mIsDragging) { 
        if (Math.abs(deltaX) > mTouchSlop) { 
         mIsDragging = true; 
        } 
       } 

       if (mIsDragging) { 
        mLastMotionX = x; 
        if (mViewPager.isFakeDragging() || mViewPager.beginFakeDrag()) { 
         mViewPager.fakeDragBy(deltaX); 
        } 
       } 

       break; 
      } 

      case MotionEvent.ACTION_CANCEL: 
      case MotionEvent.ACTION_UP: 
       if (!mIsDragging) { 
        final int count = mViewPager.getAdapter().getCount(); 
        final int width = getWidth(); 
        final float halfWidth = width/2f; 
        final float sixthWidth = width/6f; 

        if ((mCurrentPage > 0) && (ev.getX() < halfWidth - sixthWidth)) { 
         if (action != MotionEvent.ACTION_CANCEL) { 
          mViewPager.setCurrentItem(mCurrentPage - 1); 
         } 
         return true; 
        } else if ((mCurrentPage < count - 1) && (ev.getX() > halfWidth + sixthWidth)) { 
         if (action != MotionEvent.ACTION_CANCEL) { 
          mViewPager.setCurrentItem(mCurrentPage + 1); 
         } 
         return true; 
        } 
       } 

       mIsDragging = false; 
       mActivePointerId = INVALID_POINTER; 
       if (mViewPager.isFakeDragging()) mViewPager.endFakeDrag(); 
       break; 

      case MotionEventCompat.ACTION_POINTER_DOWN: { 
       final int index = MotionEventCompat.getActionIndex(ev); 
       mLastMotionX = MotionEventCompat.getX(ev, index); 
       mActivePointerId = MotionEventCompat.getPointerId(ev, index); 
       break; 
      } 

      case MotionEventCompat.ACTION_POINTER_UP: 
       final int pointerIndex = MotionEventCompat.getActionIndex(ev); 
       final int pointerId = MotionEventCompat.getPointerId(ev, pointerIndex); 
       if (pointerId == mActivePointerId) { 
        final int newPointerIndex = pointerIndex == 0 ? 1 : 0; 
        mActivePointerId = MotionEventCompat.getPointerId(ev, newPointerIndex); 
       } 
       mLastMotionX = MotionEventCompat.getX(ev, MotionEventCompat.findPointerIndex(ev, mActivePointerId)); 
       break; 
     } 

     return true; 
    } 

    @Override 
    public void setViewPager(ViewPager view) { 
     if (mViewPager == view) { 
      return; 
     } 
     if (mViewPager != null) { 
      mViewPager.setOnPageChangeListener(null); 
     } 
     if (view.getAdapter() == null) { 
      throw new IllegalStateException("ViewPager does not have adapter instance."); 
     } 
     mViewPager = view; 
     mViewPager.setOnPageChangeListener(this); 
     invalidate(); 
    } 

    @Override 
    public void setViewPager(ViewPager view, int initialPosition) { 
     setViewPager(view); 
     setCurrentItem(initialPosition); 
    } 

    @Override 
    public void setCurrentItem(int item) { 
     if (mViewPager == null) { 
      throw new IllegalStateException("ViewPager has not been bound."); 
     } 
     mViewPager.setCurrentItem(item); 
     mCurrentPage = item; 
     invalidate(); 
    } 

    @Override 
    public void notifyDataSetChanged() { 
     invalidate(); 
    } 

    @Override 
    public void onPageScrollStateChanged(int state) { 
     mScrollState = state; 

     if (mListener != null) { 
      mListener.onPageScrollStateChanged(state); 
     } 
    } 

    @Override 
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { 
     mCurrentPage = position; 
     mPageOffset = positionOffset; 
     invalidate(); 

     if (mListener != null) { 
      mListener.onPageScrolled(position, positionOffset, positionOffsetPixels); 
     } 
    } 

    @Override 
    public void onPageSelected(int position) { 
     if (mSnap || mScrollState == ViewPager.SCROLL_STATE_IDLE) { 
      mCurrentPage = position; 
      mSnapPage = position; 
      invalidate(); 
     } 

     if (mListener != null) { 
      mListener.onPageSelected(position); 
     } 
    } 

    @Override 
    public void setOnPageChangeListener(ViewPager.OnPageChangeListener listener) { 
     mListener = listener; 
    } 

    /* 
    * (non-Javadoc) 
    * 
    * @see android.view.View#onMeasure(int, int) 
    */ 
    @Override 
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 
     if (mOrientation == HORIZONTAL) { 
      setMeasuredDimension(measureLong(widthMeasureSpec), measureShort(heightMeasureSpec)); 
     } else { 
      setMeasuredDimension(measureShort(widthMeasureSpec), measureLong(heightMeasureSpec)); 
     } 
    } 

    /** 
    * Determines the width of this view 
    * 
    * @param measureSpec A measureSpec packed into an int 
    * @return The width of the view, honoring constraints from measureSpec 
    */ 
    private int measureLong(int measureSpec) { 
     int result; 
     int specMode = MeasureSpec.getMode(measureSpec); 
     int specSize = MeasureSpec.getSize(measureSpec); 

     if ((specMode == MeasureSpec.EXACTLY) || (mViewPager == null)) { 
      //We were told how big to be 
      result = specSize; 
     } else { 
      //Calculate the width according the views count 
      final int count = mViewPager.getAdapter().getCount(); 
      result = (int) (getPaddingLeft() + getPaddingRight() 
        + (count * 2 * mRadius) + (count - 1) * mRadius + 1); 
      //Respect AT_MOST value if that was what is called for by measureSpec 
      if (specMode == MeasureSpec.AT_MOST) { 
       result = Math.min(result, specSize); 
      } 
     } 
     return result; 
    } 

    /** 
    * Determines the height of this view 
    * 
    * @param measureSpec A measureSpec packed into an int 
    * @return The height of the view, honoring constraints from measureSpec 
    */ 
    private int measureShort(int measureSpec) { 
     int result; 
     int specMode = MeasureSpec.getMode(measureSpec); 
     int specSize = MeasureSpec.getSize(measureSpec); 

     if (specMode == MeasureSpec.EXACTLY) { 
      //We were told how big to be 
      result = specSize; 
     } else { 
      //Measure the height 
      result = (int) (2 * mRadius + getPaddingTop() + getPaddingBottom() + 1); 
      //Respect AT_MOST value if that was what is called for by measureSpec 
      if (specMode == MeasureSpec.AT_MOST) { 
       result = Math.min(result, specSize); 
      } 
     } 
     return result; 
    } 

    @Override 
    public void onRestoreInstanceState(Parcelable state) { 
     SavedState savedState = (SavedState) state; 
     super.onRestoreInstanceState(savedState.getSuperState()); 
     mCurrentPage = savedState.currentPage; 
     mSnapPage = savedState.currentPage; 
     requestLayout(); 
    } 

    @Override 
    public Parcelable onSaveInstanceState() { 
     Parcelable superState = super.onSaveInstanceState(); 
     SavedState savedState = new SavedState(superState); 
     savedState.currentPage = mCurrentPage; 
     return savedState; 
    } 

    static class SavedState extends BaseSavedState { 
     int currentPage; 

     public SavedState(Parcelable superState) { 
      super(superState); 
     } 

     private SavedState(Parcel in) { 
      super(in); 
      currentPage = in.readInt(); 
     } 

     @Override 
     public void writeToParcel(Parcel dest, int flags) { 
      super.writeToParcel(dest, flags); 
      dest.writeInt(currentPage); 
     } 

     @SuppressWarnings("UnusedDeclaration") 
     public static final Parcelable.Creator<SavedState> CREATOR = new Parcelable.Creator<SavedState>() { 
      @Override 
      public SavedState createFromParcel(Parcel in) { 
       return new SavedState(in); 
      } 

      @Override 
      public SavedState[] newArray(int size) { 
       return new SavedState[size]; 
      } 
     }; 
    } 
} 

Wskazówka linia

distanceBetweenCircles = getResources().getDimensionPixelSize(R.dimen._40); 

Aby zmienić odległość, wystarczy zmienić wartość distanceBetweenCircles. Naprawiłem go, ponieważ zawsze potrzebowałem tej samej odległości we wszystkich moich poglądach.

Answer 5

Wykorzystanie niestandardowych nieruchomość gapWidth

<com.viewpagerindicator.CirclePageIndicator 
    android:id="@+id/indicator" 
    android:padding="@dimen/activity_padding" 
    android:layout_gravity="center_horizontal|bottom" 
    android:layout_margin="@dimen/tutorial_indicator_margin" 
    android:layout_height="wrap_content" 
    android:layout_width="wrap_content" 
    android:background="#00000000" 
    app:gapWidth="24dp"/> 

Nie zapomnij dodać xmlns:app="http://schemas.android.com/apk/res-auto" do układu nadrzędnego.