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如何在android中的范围搜索栏中设置两个拇指之间的范围?

作者:互联网

我在我的应用程序中使用范围搜索栏.它工作正常但我的要求是设置两个拇指之间的范围.默认情况下,两个拇指在我的情况下相互重叠拇指彼此不重叠.

如何在范围搜索条中设置两个拇指之间的范围?

下面是我的范围搜索栏类.在我的情况下,两个拇指之间的差异是3.如果两个拇指差异是3,拇指是不能重叠的.如何设置拇指之间的范围?

这是我用过的课程

public class RangeSeekBar<T extends Number> extends ImageView {
    private final Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
    private final Bitmap thumbImage = BitmapFactory.decodeResource(getResources(), R.drawable.seekcircle_blue);
    private final Bitmap thumbPressedImage = BitmapFactory.decodeResource(getResources(), R.drawable.seekcircle_red);
    private final float thumbWidth = thumbImage.getWidth();
    private final float thumbHalfWidth = 0.5f * thumbWidth;
    private final float thumbHalfHeight = 0.5f * thumbImage.getHeight();
    private final float lineHeight = 0.8f * thumbHalfHeight;
    private final float padding = thumbHalfWidth;
    private final T absoluteMinValue, absoluteMaxValue;
    private final NumberType numberType;
    private final double absoluteMinValuePrim, absoluteMaxValuePrim;
    private double normalizedMinValue = 0d;
    private double normalizedMaxValue = 1d;
    private Thumb pressedThumb = null;
    private boolean notifyWhileDragging = false;
    private OnRangeSeekBarChangeListener<T> listener;

    /**
     * Default color of a {@link RangeSeekBar}, #FF33B5E5. This is also known as "Ice Cream Sandwich" blue.
     */
    public static final int DEFAULT_COLOR = Color.argb(0xFF, 0, 0, 0);

    /**
     * An invalid pointer id.
     */
    public static final int INVALID_POINTER_ID = 255;

    // Localized constants from MotionEvent for compatibility
    // with API < 8 "Froyo".
    public static final int ACTION_POINTER_UP = 0x6, ACTION_POINTER_INDEX_MASK = 0x0000ff00, ACTION_POINTER_INDEX_SHIFT = 8;

    private float mDownMotionX;
    private int mActivePointerId = INVALID_POINTER_ID;

    /**
     * On touch, this offset plus the scaled value from the position of the touch will form the progress value. Usually 0.
     */
    float mTouchProgressOffset;

    private int mScaledTouchSlop;
    private boolean mIsDragging;

    /**
     * Creates a new RangeSeekBar.
     * 
     * @param absoluteMinValue
     *            The minimum value of the selectable range.
     * @param absoluteMaxValue
     *            The maximum value of the selectable range.
     * @param context
     * @throws IllegalArgumentException
     *             Will be thrown if min/max value type is not one of Long, Double, Integer, Float, Short, Byte or BigDecimal.
     */
    public RangeSeekBar(T absoluteMinValue, T absoluteMaxValue, Context context) throws IllegalArgumentException {
            super(context);
            this.absoluteMinValue = absoluteMinValue;
            this.absoluteMaxValue = absoluteMaxValue;
            absoluteMinValuePrim = absoluteMinValue.doubleValue();
            absoluteMaxValuePrim = absoluteMaxValue.doubleValue();
            numberType = NumberType.fromNumber(absoluteMinValue);

            // make RangeSeekBar focusable. This solves focus handling issues in case EditText widgets are being used along with the RangeSeekBar within ScollViews.
            setFocusable(true);
            setFocusableInTouchMode(true);
            init();
    }

    private final void init() {
            mScaledTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop();
    }

    public boolean isNotifyWhileDragging() {
            return notifyWhileDragging;
    }

    /**
     * Should the widget notify the listener callback while the user is still dragging a thumb? Default is false.
     * 
     * @param flag
     */
    public void setNotifyWhileDragging(boolean flag) {
            this.notifyWhileDragging = flag;
    }

    /**
     * Returns the absolute minimum value of the range that has been set at construction time.
     * 
     * @return The absolute minimum value of the range.
     */
    public T getAbsoluteMinValue() {
            return absoluteMinValue;
    }

    /**
     * Returns the absolute maximum value of the range that has been set at construction time.
     * 
     * @return The absolute maximum value of the range.
     */
    public T getAbsoluteMaxValue() {
            return absoluteMaxValue;
    }

    /**
     * Returns the currently selected min value.
     * 
     * @return The currently selected min value.
     */
    public T getSelectedMinValue() {
            return normalizedToValue(normalizedMinValue);
    }

    /**
     * Sets the currently selected minimum value. The widget will be invalidated and redrawn.
     * 
     * @param value
     *            The Number value to set the minimum value to. Will be clamped to given absolute minimum/maximum range.
     */
    public void setSelectedMinValue(T value) {
            // in case absoluteMinValue == absoluteMaxValue, avoid division by zero when normalizing.
            if (0 == (absoluteMaxValuePrim - absoluteMinValuePrim)) {
                    setNormalizedMinValue(0d);
            }
            else {
                    setNormalizedMinValue(valueToNormalized(value));
            }
    }

    /**
     * Returns the currently selected max value.
     * 
     * @return The currently selected max value.
     */
    public T getSelectedMaxValue() {
            return normalizedToValue(normalizedMaxValue);
    }

    /**
     * Sets the currently selected maximum value. The widget will be invalidated and redrawn.
     * 
     * @param value
     *            The Number value to set the maximum value to. Will be clamped to given absolute minimum/maximum range.
     */
    public void setSelectedMaxValue(T value) {
            // in case absoluteMinValue == absoluteMaxValue, avoid division by zero when normalizing.
            if (0 == (absoluteMaxValuePrim - absoluteMinValuePrim)) {
                    setNormalizedMaxValue(1d);
            }
            else {
                    setNormalizedMaxValue(valueToNormalized(value));
            }
    }

    /**
     * Registers given listener callback to notify about changed selected values.
     * 
     * @param listener
     *            The listener to notify about changed selected values.
     */
    public void setOnRangeSeekBarChangeListener(OnRangeSeekBarChangeListener<T> listener) {
            this.listener = listener;
    }

    /**
     * Handles thumb selection and movement. Notifies listener callback on certain events.
     */
    @Override
    public boolean onTouchEvent(MotionEvent event) {

            if (!isEnabled())
                    return false;

            int pointerIndex;

            final int action = event.getAction();
            switch (action & MotionEvent.ACTION_MASK) {

            case MotionEvent.ACTION_DOWN:
                    // Remember where the motion event started
                    mActivePointerId = event.getPointerId(event.getPointerCount() - 1);
                    pointerIndex = event.findPointerIndex(mActivePointerId);
                    mDownMotionX = event.getX(pointerIndex);

                    pressedThumb = evalPressedThumb(mDownMotionX);

                    // Only handle thumb presses.
                    if (pressedThumb == null)
                            return super.onTouchEvent(event);

                    setPressed(true);
                    invalidate();
                    onStartTrackingTouch();
                    trackTouchEvent(event);
                    attemptClaimDrag();

                    break;
            case MotionEvent.ACTION_MOVE:
                    if (pressedThumb != null) {

                            if (mIsDragging) {
                                    trackTouchEvent(event);
                            }
                            else {
                                    // Scroll to follow the motion event
                                    pointerIndex = event.findPointerIndex(mActivePointerId);
                                    final float x = event.getX(pointerIndex);

                                    if (Math.abs(x - mDownMotionX) > mScaledTouchSlop) {
                                            setPressed(true);
                                            invalidate();
                                            onStartTrackingTouch();
                                            trackTouchEvent(event);
                                            attemptClaimDrag();
                                    }
                            }

                            if (listener != null) {
                                    listener.onRangeSeekBarValuesChanged(this, getSelectedMinValue(), getSelectedMaxValue());
                            }
                    }
                    break;
            case MotionEvent.ACTION_UP:
                    if (mIsDragging) {
                            trackTouchEvent(event);
                            onStopTrackingTouch();
                            setPressed(false);
                    }
                    else {
                            // Touch up when we never crossed the touch slop threshold
                            // should be interpreted as a tap-seek to that location.
                            onStartTrackingTouch();
                            trackTouchEvent(event);
                            onStopTrackingTouch();
                    }

                    pressedThumb = null;
                    invalidate();
                    if (listener != null) {
                            listener.onRangeSeekBarValuesChanged(this, getSelectedMinValue(), getSelectedMaxValue());
                    }
                    break;
            case MotionEvent.ACTION_POINTER_DOWN: {
                    final int index = event.getPointerCount() - 1;
                    // final int index = ev.getActionIndex();
                    mDownMotionX = event.getX(index);
                    mActivePointerId = event.getPointerId(index);
                    invalidate();
                    break;
            }
            case MotionEvent.ACTION_POINTER_UP:
                    onSecondaryPointerUp(event);
                    invalidate();
                    break;
            case MotionEvent.ACTION_CANCEL:
                    if (mIsDragging) {
                            onStopTrackingTouch();
                            setPressed(false);
                    }
                    invalidate(); // see above explanation
                    break;
            }
            return true;
    }

    private final void onSecondaryPointerUp(MotionEvent ev) {
            final int pointerIndex = (ev.getAction() & ACTION_POINTER_INDEX_MASK) >> ACTION_POINTER_INDEX_SHIFT;

            final int pointerId = ev.getPointerId(pointerIndex);
            if (pointerId == mActivePointerId) {
                    // This was our active pointer going up. Choose
                    // a new active pointer and adjust accordingly.
                    // TODO: Make this decision more intelligent.
                    final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
                    mDownMotionX = ev.getX(newPointerIndex);
                    mActivePointerId = ev.getPointerId(newPointerIndex);
            }
    }

    private final void trackTouchEvent(MotionEvent event) {
            final int pointerIndex = event.findPointerIndex(mActivePointerId);
            final float x = event.getX(pointerIndex);

            if (Thumb.MIN.equals(pressedThumb)) {
                    setNormalizedMinValue(screenToNormalized(x));
            }
            else if (Thumb.MAX.equals(pressedThumb)) {
                    setNormalizedMaxValue(screenToNormalized(x));
            }
    }

    /**
     * Tries to claim the user's drag motion, and requests disallowing any ancestors from stealing events in the drag.
     */
    private void attemptClaimDrag() {
            if (getParent() != null) {
                    getParent().requestDisallowInterceptTouchEvent(true);
            }
    }

    /**
     * This is called when the user has started touching this widget.
     */
    void onStartTrackingTouch() {
            mIsDragging = true;
    }

    /**
     * This is called when the user either releases his touch or the touch is canceled.
     */
    void onStopTrackingTouch() {
            mIsDragging = false;
    }

    /**
     * Ensures correct size of the widget.
     */
    @Override
    protected synchronized void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
            int width = 200;
            if (MeasureSpec.UNSPECIFIED != MeasureSpec.getMode(widthMeasureSpec)) {
                    width = MeasureSpec.getSize(widthMeasureSpec);
            }
            int height = thumbImage.getHeight();
            if (MeasureSpec.UNSPECIFIED != MeasureSpec.getMode(heightMeasureSpec)) {
                    height = Math.min(height, MeasureSpec.getSize(heightMeasureSpec));
            }
            setMeasuredDimension(width, height);
    }

    /**
     * Draws the widget on the given canvas.
     */
    @Override
    protected synchronized void onDraw(Canvas canvas) {
            super.onDraw(canvas);

            // draw seek bar background line
            final RectF rect = new RectF(padding, 0.5f * (getHeight() - lineHeight), getWidth() - padding, 0.5f * (getHeight() + lineHeight));
            paint.setStyle(Style.FILL);
            paint.setColor(Color.GRAY);
            paint.setAntiAlias(true);
            canvas.drawRect(rect, paint);

            // draw seek bar active range line
            rect.left = normalizedToScreen(normalizedMinValue);
            rect.right = normalizedToScreen(normalizedMaxValue);

            // orange color
            paint.setColor(DEFAULT_COLOR);
            canvas.drawRect(rect, paint);

            // draw minimum thumb
            drawThumb(normalizedToScreen(normalizedMinValue), Thumb.MIN.equals(pressedThumb), canvas);

            // draw maximum thumb

            drawThumb_max(normalizedToScreen(normalizedMaxValue), Thumb.MAX.equals(pressedThumb), canvas);
    }

    /**
     * Overridden to save instance state when device orientation changes. This method is called automatically if you assign an id to the RangeSeekBar widget using the {@link #setId(int)} method. Other members of this class than the normalized min and max values don't need to be saved.
     */
    @Override
    protected Parcelable onSaveInstanceState() {
            final Bundle bundle = new Bundle();
            bundle.putParcelable("SUPER", super.onSaveInstanceState());
            bundle.putDouble("MIN", normalizedMinValue);
            bundle.putDouble("MAX", normalizedMaxValue);
            return bundle;
    }

    /**
     * Overridden to restore instance state when device orientation changes. This method is called automatically if you assign an id to the RangeSeekBar widget using the {@link #setId(int)} method.
     */
    @Override
    protected void onRestoreInstanceState(Parcelable parcel) {
            final Bundle bundle = (Bundle) parcel;
            super.onRestoreInstanceState(bundle.getParcelable("SUPER"));
            normalizedMinValue = bundle.getDouble("MIN");
            normalizedMaxValue = bundle.getDouble("MAX");
    }

    /**
     * Draws the "normal" resp. "pressed" thumb image on specified x-coordinate.
     * 
     * @param screenCoord
     *            The x-coordinate in screen space where to draw the image.
     * @param pressed
     *            Is the thumb currently in "pressed" state?
     * @param canvas
     *            The canvas to draw upon.
     */
    private void drawThumb(float screenCoord, boolean pressed, Canvas canvas) {
            canvas.drawBitmap(pressed ? thumbImage : thumbImage, screenCoord - thumbHalfWidth, (float) ((0.5f * getHeight()) - thumbHalfHeight), paint);
    }

    private void drawThumb_max(float screenCoord, boolean pressed, Canvas canvas)
    {
            canvas.drawBitmap(pressed ? thumbPressedImage : thumbPressedImage, screenCoord - thumbHalfWidth, (float) ((0.5f * getHeight()) - thumbHalfHeight), paint);
    }

    /**
     * Decides which (if any) thumb is touched by the given x-coordinate.
     * 
     * @param touchX
     *            The x-coordinate of a touch event in screen space.
     * @return The pressed thumb or null if none has been touched.
     */
    private Thumb evalPressedThumb(float touchX) {
            Thumb result = null;
            boolean minThumbPressed = isInThumbRange(touchX, normalizedMinValue);
            boolean maxThumbPressed = isInThumbRange(touchX, normalizedMaxValue);
            if (minThumbPressed && maxThumbPressed) {
                    // if both thumbs are pressed (they lie on top of each other), choose the one with more room to drag. this avoids "stalling" the thumbs in a corner, not being able to drag them apart anymore.
                    result = (touchX / getWidth() > 0.5f) ? Thumb.MIN : Thumb.MAX;
            }
            else if (minThumbPressed) {
                    result = Thumb.MIN;
            }
            else if (maxThumbPressed) {
                    result = Thumb.MAX;
            }
            return result;
    }

    /**
     * Decides if given x-coordinate in screen space needs to be interpreted as "within" the normalized thumb x-coordinate.
     * 
     * @param touchX
     *            The x-coordinate in screen space to check.
     * @param normalizedThumbValue
     *            The normalized x-coordinate of the thumb to check.
     * @return true if x-coordinate is in thumb range, false otherwise.
     */
    private boolean isInThumbRange(float touchX, double normalizedThumbValue) {
            return Math.abs(touchX - normalizedToScreen(normalizedThumbValue)) <= thumbHalfWidth;
    }

    /**
     * Sets normalized min value to value so that 0 <= value <= normalized max value <= 1. The View will get invalidated when calling this method.
     * 
     * @param value
     *            The new normalized min value to set.
     */
    public void setNormalizedMinValue(double value) {
            normalizedMinValue = Math.max(0d, Math.min(1d, Math.min(value, normalizedMaxValue)));
            invalidate();
    }

    /**
     * Sets normalized max value to value so that 0 <= normalized min value <= value <= 1. The View will get invalidated when calling this method.
     * 
     * @param value
     *            The new normalized max value to set.
     */
    public void setNormalizedMaxValue(double value) {
            normalizedMaxValue = Math.max(0d, Math.min(1d, Math.max(value, normalizedMinValue)));
            invalidate();
    }

    /**
     * Converts a normalized value to a Number object in the value space between absolute minimum and maximum.
     * 
     * @param normalized
     * @return
     */
    @SuppressWarnings("unchecked")
    private T normalizedToValue(double normalized) {
            return (T) numberType.toNumber(absoluteMinValuePrim + normalized * (absoluteMaxValuePrim - absoluteMinValuePrim));
    }

    /**
     * Converts the given Number value to a normalized double.
     * 
     * @param value
     *            The Number value to normalize.
     * @return The normalized double.
     */
    private double valueToNormalized(T value) {
            if (0 == absoluteMaxValuePrim - absoluteMinValuePrim) {
                    // prevent division by zero, simply return 0.
                    return 0d;
            }
            return (value.doubleValue() - absoluteMinValuePrim) / (absoluteMaxValuePrim - absoluteMinValuePrim);
    }

    /**
     * Converts a normalized value into screen space.
     * 
     * @param normalizedCoord
     *            The normalized value to convert.
     * @return The converted value in screen space.
     */
    private float normalizedToScreen(double normalizedCoord) {
            return (float) (padding + normalizedCoord * (getWidth() - 2 * padding));
    }

    /**
     * Converts screen space x-coordinates into normalized values.
     * 
     * @param screenCoord
     *            The x-coordinate in screen space to convert.
     * @return The normalized value.
     */
    private double screenToNormalized(float screenCoord) {
            int width = getWidth();
            if (width <= 2 * padding) {
                    // prevent division by zero, simply return 0.
                    return 0d;
            }
            else {
                    double result = (screenCoord - padding) / (width - 2 * padding);
                    return Math.min(1d, Math.max(0d, result));
            }
    }

    /**
     * Callback listener interface to notify about changed range values.
     * 
     * @author Stephan Tittel (stephan.tittel@kom.tu-darmstadt.de)
     * 
     * @param <T>
     *            The Number type the RangeSeekBar has been declared with.
     */
    public interface OnRangeSeekBarChangeListener<T> {
            public void onRangeSeekBarValuesChanged(RangeSeekBar<?> bar, T minValue, T maxValue);
    }

    /**
     * Thumb constants (min and max).
     */
    private static enum Thumb {
            MIN, MAX
    };

    /**
     * Utility enumaration used to convert between Numbers and doubles.
     * 
     * @author Stephan Tittel (stephan.tittel@kom.tu-darmstadt.de)
     * 
     */
    private static enum NumberType {
            LONG, DOUBLE, INTEGER, FLOAT, SHORT, BYTE, BIG_DECIMAL;

            public static <E extends Number> NumberType fromNumber(E value) throws IllegalArgumentException {
                    if (value instanceof Long) {
                            return LONG;
                    }
                    if (value instanceof Double) {
                            return DOUBLE;
                    }
                    if (value instanceof Integer) {
                            return INTEGER;
                    }
                    if (value instanceof Float) {
                            return FLOAT;
                    }
                    if (value instanceof Short) {
                            return SHORT;
                    }
                    if (value instanceof Byte) {
                            return BYTE;
                    }
                    if (value instanceof BigDecimal) {
                            return BIG_DECIMAL;
                    }
                    throw new IllegalArgumentException("Number class '" + value.getClass().getName() + "' is not supported");
            }

            public Number toNumber(double value) {
                    switch (this) {
                    case LONG:
                            return new Long((long) value);
                    case DOUBLE:
                            return value;
                    case INTEGER:
                            return new Integer((int) value);
                    case FLOAT:
                            return new Float(value);
                    case SHORT:
                            return new Short((short) value);
                    case BYTE:
                            return new Byte((byte) value);
                    case BIG_DECIMAL:
                            return new BigDecimal(value);
                    }
                    throw new InstantiationError("can't convert " + this + " to a Number object");
            }
    }}

enter image description here

编辑:Java类代码

// create RangeSeekBar as Integer range between 20 and 75
    final RangeSeekBar<Integer> seekBar = new RangeSeekBar<Integer>(0, 35, this);
    seekBar.setSelectedMinValue(5);
   seekBar.setSelectedMaxValue(8);
    seekBar.setOnRangeSeekBarChangeListener(new RangeSeekBar.OnRangeSeekBarChangeListener<Integer>() {
            @Override
            public void onRangeSeekBarValuesChanged(RangeSeekBar<?> bar, Integer minValue, Integer maxValue) {
                    // handle changed range values
                    Log.i(TAG, "User selected new range values: MIN=" + minValue + ", MAX=" + maxValue);



                int diff=maxValue-minValue;
                if(diff==4)
                {




                }



            }
    });

    // add RangeSeekBar to pre-defined layout
    ViewGroup layout = (ViewGroup) findViewById(R.id.layout);
    layout.addView(seekBar);

解决方法:

当差异为4时,用于停止拇指的运动.您可以使用

if(diff==4) {
    bar.setEnabled(false);
}

为了更清楚,请转到我们的blog并查看如何在RangedSeekBar部分中拖动时禁用拇指.

标签:android,range,android-seekbar
来源: https://codeday.me/bug/20190628/1312224.html