Pageranzeige anzeigen Jake Wharton

Question

Ich benutze das Beispiel von Jake Wharton, um den Anzeigepager anzuzeigen. www.viewpagerindicator.com

Ich verwende Snap-Kreis-Indikator.

Kann mir bitte jemand sagen, wie man die Breite zwischen den Kreisen erhöht?

Welcher Parameter sollte geändert werden?

Answer 1

Sie können alle Parameter in der Datei res/values ​​/ vpi_attrs.xml finden. Der Stil des CirclePageIndicator assoziiert angegeben:

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

Es ist nicht möglich, Lücke zwischen zwei Kreis zu ändern. Sie müssen CirclePageIndicator Unterklasse:

• erstellen YourCirclePageIndicator in Ihrem Projekt
• fügen Sie eine neue Ausprägungs gapCircle
• Überschreibung OnDraw-Methode und ändern Sie die Rechen von shortOffset/longOffset

Answer 2

Wir brauchen die "zu erhöhen threeRadius "Parameter auf höheren Wert. Vielen Dank.

Answer 3

Anruf CirclePageIndicator.setRadius()

Answer 4

Ich weiß, dass dies eine alte Frage, aber für andere, die in dieses Problem in der Zukunft führen könnten, ich dachte, dass ich es besser schreiben würde.
Das Erhöhen des Parameters "threeRadius" auf einen höheren Wert ist nicht möglich, da die Zentrierung der Kreise dadurch gestört wird.

So, hier ist eine modifizierte Version von CirclePageIndicator Klasse:

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]; 
      } 
     }; 
    } 
} 

Beachten Sie die Linie

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

den Abstand zu ändern, einfach den Wert vondistanceBetweenCircles ändern. Ich habe es fest programmiert, weil ich in all meinen Ansichten immer die gleiche Distanz brauchte.

Answer 5

Verwenden benutzerdefinierte Eigenschaft 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"/> 

Vergessen Sie nicht xmlns:app="http://schemas.android.com/apk/res-auto" zu Ihren Eltern Layout hinzuzufügen.