android.view.ViewConfiguration#get ( )源码实例Demo

/**
 * Apps should use ViewDragHelper.create() to get a new instance.
 * This will allow VDH to use internal compatibility implementations for different
 * platform versions.
 *
 * @param context Context to initialize config-dependent params from
 * @param forParent Parent view to monitor
 */
private ViewDragHelper(Context context, ViewGroup forParent, Callback cb) {
    if (forParent == null) {
        throw new IllegalArgumentException("Parent view may not be null");
    }
    if (cb == null) {
        throw new IllegalArgumentException("Callback may not be null");
    }

    mParentView = forParent;
    mCallback = cb;

    final ViewConfiguration vc = ViewConfiguration.get(context);
    final float density = context.getResources().getDisplayMetrics().density;
    mEdgeSize = (int) (EDGE_SIZE * density + 0.5f);

    mTouchSlop = vc.getScaledTouchSlop();
    mMaxVelocity = vc.getScaledMaximumFlingVelocity();
    mMinVelocity = vc.getScaledMinimumFlingVelocity();
    mScroller = ScrollerCompat.create(context, sInterpolator);
}
 

public InboxLayoutBase(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    ViewConfiguration config = ViewConfiguration.get(context);
    mTouchSlop = config.getScaledTouchSlop();
    closeDistance = dp2px(60);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
        this.setLayerType(View.LAYER_TYPE_HARDWARE, null);
    }
    mHeightAnimator = ObjectAnimator.ofInt(this, aHeight, 0, 0);
    mScrollYAnimator = ObjectAnimator.ofInt(this, aScrollY, 0, 0);
    mHeightAnimator.setDuration(ANIMDURA);
    mScrollYAnimator.setDuration(ANIMDURA);
    animatorSet.playTogether(mHeightAnimator, mScrollYAnimator);
    animatorSet.setInterpolator(mInterpolator);

    mDragableView = createDragableView(context, attrs);
    addDragableView(mDragableView);

}
 

private void init(Context context) {
    if (context == null) {
        throw new IllegalArgumentException("Context must not be null");
    }
    if (mListener == null) {
        throw new IllegalArgumentException("OnGestureListener must not be null");
    }
    mIsLongpressEnabled = true;

    final ViewConfiguration configuration = ViewConfiguration.get(context);
    final int touchSlop = configuration.getScaledTouchSlop();
    final int doubleTapSlop = configuration.getScaledDoubleTapSlop();
    mMinimumFlingVelocity = configuration.getScaledMinimumFlingVelocity();
    mMaximumFlingVelocity = configuration.getScaledMaximumFlingVelocity();

    mTouchSlopSquare = touchSlop * touchSlop;
    mDoubleTapSlopSquare = doubleTapSlop * doubleTapSlop;
}
 

public void init(Context context) {
	setOnItemLongClickListener(mOnItemLongClickListener);
	setOnScrollListener(mScrollListener);
	DisplayMetrics metrics = context.getResources().getDisplayMetrics();
	mSmoothScrollAmountAtEdge = (int) (SMOOTH_SCROLL_AMOUNT_AT_EDGE / metrics.density);
	ViewConfiguration vc = ViewConfiguration.get(getContext());
	mSlop = vc.getScaledTouchSlop();
}
 

public CustWebView(Context arg0, AttributeSet arg1, int arg2) {
    super(arg0, arg1, arg2);
    disableZoomController();

    ViewConfiguration configuration = ViewConfiguration.get(getContext());
    mTouchSlop = configuration.getScaledTouchSlop();
}
 

protected void initMethods() {
    ViewConfiguration configuration = ViewConfiguration.get(mContext);
    mMaximumVelocity = configuration.getScaledMaximumFlingVelocity() * 100;
    mIdealMargin = Converter.dpAsPixels(this, 4);
    setImeOptions(EditorInfo.IME_FLAG_NO_EXTRACT_UI);
    setOnKeyListener(this);
}
 

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

    final Resources res = getResources();

    //Load defaults from resources
    final boolean defaultFades = res.getBoolean(R.bool.default_underline_indicator_fades);
    final int defaultFadeDelay = res.getInteger(R.integer.default_underline_indicator_fade_delay);
    final int defaultFadeLength = res.getInteger(R.integer.default_underline_indicator_fade_length);
    final int defaultSelectedColor = res.getColor(R.color.default_underline_indicator_selected_color);

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

    setFades(a.getBoolean(R.styleable.UnderlinePageIndicator_fades, defaultFades));
    setSelectedColor(a.getColor(R.styleable.UnderlinePageIndicator_selectedColor, defaultSelectedColor));
    setFadeDelay(a.getInteger(R.styleable.UnderlinePageIndicator_fadeDelay, defaultFadeDelay));
    setFadeLength(a.getInteger(R.styleable.UnderlinePageIndicator_fadeLength, defaultFadeLength));

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

    a.recycle();

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

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

    final Resources res = getResources();

    //Load defaults from resources
    final int defaultSelectedColor = res.getColor(R.color.default_line_indicator_selected_color);
    final int defaultUnselectedColor = res.getColor(R.color.default_line_indicator_unselected_color);
    final float defaultLineWidth = res.getDimension(R.dimen.default_line_indicator_line_width);
    final float defaultGapWidth = res.getDimension(R.dimen.default_line_indicator_gap_width);
    final float defaultStrokeWidth = res.getDimension(R.dimen.default_line_indicator_stroke_width);
    final boolean defaultCentered = res.getBoolean(R.bool.default_line_indicator_centered);

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

    mCentered = a.getBoolean(R.styleable.LinePageIndicator_centered, defaultCentered);
    mLineWidth = a.getDimension(R.styleable.LinePageIndicator_lineWidth, defaultLineWidth);
    mGapWidth = a.getDimension(R.styleable.LinePageIndicator_gapWidth, defaultGapWidth);
    setStrokeWidth(a.getDimension(R.styleable.LinePageIndicator_strokeWidth, defaultStrokeWidth));
    mPaintUnselected.setColor(a.getColor(R.styleable.LinePageIndicator_unselectedColor, defaultUnselectedColor));
    mPaintSelected.setColor(a.getColor(R.styleable.LinePageIndicator_selectedColor, defaultSelectedColor));

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

    a.recycle();

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

/**
 * Constructs a new swipe-to-dismiss touch listener for the given list view.
 *
 * @param recyclerView  The list view whose items should be dismissable.
 * @param callbacks The callback to trigger when the user has indicated that she would like to
 *                  dismiss one or more list items.
 */
public SwipeToDismissTouchListener(SomeCollectionView recyclerView,
                                   DismissCallbacks<SomeCollectionView> callbacks) {
    ViewConfiguration vc = ViewConfiguration.get(recyclerView.getContext());
    mSlop = vc.getScaledTouchSlop();
    mMinFlingVelocity = vc.getScaledMinimumFlingVelocity() * 16;
    mMaxFlingVelocity = vc.getScaledMaximumFlingVelocity();
    mAnimationTime = recyclerView.getContext().getResources().getInteger(
            android.R.integer.config_shortAnimTime);
    mRecyclerView = recyclerView;
    mCallbacks = callbacks;
    mHandler = new Handler();
}
 

/**
 * Set action bar overflow showing always, avoid it's not showing on some phones.
 */
private void setOverflowShowingAlways() {
    try {
        ViewConfiguration config = ViewConfiguration.get(this);
        Field menuKeyField = ViewConfiguration.class.getDeclaredField("sHasPermanentMenuKey");
        menuKeyField.setAccessible(true);
        menuKeyField.setBoolean(config, false);
    } catch (Exception e) {
        // ignore
    }
}
 

LongPressDetector(Context context, LongPressDelegate delegate) {
    mLongPressDelegate = delegate;
    mLongPressHandler = new LongPressHandler();
    final ViewConfiguration configuration = ViewConfiguration.get(context);
    int touchSlop = configuration.getScaledTouchSlop();
    mTouchSlopSquare = touchSlop * touchSlop;
}
 

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);

    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);
}
 

void initViewPager() {
    setWillNotDraw(false);
    setDescendantFocusability(FOCUS_AFTER_DESCENDANTS);
    setFocusable(true);
    final Context context = getContext();
    mScroller = new Scroller(context, sInterpolator);
    final ViewConfiguration configuration = ViewConfiguration.get(context);
    final float density = context.getResources().getDisplayMetrics().density;

    mTouchSlop = ViewConfigurationCompat.getScaledPagingTouchSlop(configuration);
    mMinimumVelocity = (int) (MIN_FLING_VELOCITY * density);
    mMaximumVelocity = configuration.getScaledMaximumFlingVelocity();
    mLeftEdge = new EdgeEffectCompat(context);
    mRightEdge = new EdgeEffectCompat(context);

    mFlingDistance = (int) (MIN_DISTANCE_FOR_FLING * density);
    mCloseEnough = (int) (CLOSE_ENOUGH * density);
    mDefaultGutterSize = (int) (DEFAULT_GUTTER_SIZE * density);

    ViewCompat.setAccessibilityDelegate(this, new MyAccessibilityDelegate());

    if (ViewCompat.getImportantForAccessibility(this)
            == ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_AUTO) {
        ViewCompat.setImportantForAccessibility(this,
                ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_YES);
    }
}
 

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

    final Resources res = getResources();

    //Load defaults from resources
    final int defaultSelectedColor = res.getColor(R.color.default_line_indicator_selected_color);
    final int defaultUnselectedColor = res.getColor(R.color.default_line_indicator_unselected_color);
    final float defaultLineWidth = res.getDimension(R.dimen.default_line_indicator_line_width);
    final float defaultGapWidth = res.getDimension(R.dimen.default_line_indicator_gap_width);
    final float defaultStrokeWidth = res.getDimension(R.dimen.default_line_indicator_stroke_width);
    final boolean defaultCentered = res.getBoolean(R.bool.default_line_indicator_centered);

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

    mCentered = a.getBoolean(R.styleable.LinePageIndicator_centered, defaultCentered);
    mLineWidth = a.getDimension(R.styleable.LinePageIndicator_lineWidth, defaultLineWidth);
    mGapWidth = a.getDimension(R.styleable.LinePageIndicator_gapWidth, defaultGapWidth);
    setStrokeWidth(a.getDimension(R.styleable.LinePageIndicator_strokeWidth, defaultStrokeWidth));
    mPaintUnselected.setColor(a.getColor(R.styleable.LinePageIndicator_unselectedColor, defaultUnselectedColor));
    mPaintSelected.setColor(a.getColor(R.styleable.LinePageIndicator_selectedColor, defaultSelectedColor));

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

    a.recycle();

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

private void initTwoDScrollView() {
    mScroller = new Scroller(getContext());
    setFocusable(true);
    setDescendantFocusability(FOCUS_AFTER_DESCENDANTS);
    setWillNotDraw(false);
    final ViewConfiguration configuration = ViewConfiguration.get(getContext());
    mTouchSlop = configuration.getScaledTouchSlop();
    mMinimumVelocity = configuration.getScaledMinimumFlingVelocity();
    mMaximumVelocity = configuration.getScaledMaximumFlingVelocity();
}
 

/**
 * Constructs a new swipe-to-dismiss touch listener for the given list view.
 *
 * @param listView
 *            The list view whose items should be dismissable.
 * @param callback
 *            The callback to trigger when the user has indicated that she
 *            would like to dismiss one or more list items.
 */
public SwipeDismissListViewTouchListener(final AbsListView listView, final OnDismissCallback callback, final SwipeOnScrollListener onScroll) {
    ViewConfiguration vc = ViewConfiguration.get(listView.getContext());
    mSlop = vc.getScaledTouchSlop();
    mMinFlingVelocity = vc.getScaledMinimumFlingVelocity() * MIN_FLING_VELOCITY_FACTOR;
    mMaxFlingVelocity = vc.getScaledMaximumFlingVelocity();
    mAnimationTime = listView.getContext().getResources().getInteger(android.R.integer.config_shortAnimTime);
    mListView = listView;
    mCallback = callback;

    onScroll.setTouchListener(this);
    mListView.setOnScrollListener(onScroll);
}
 

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);

    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 RadialPickerLayout(Context context, AttributeSet attrs) {
    super(context, attrs);

    setOnTouchListener(this);
    ViewConfiguration vc = ViewConfiguration.get(context);
    TOUCH_SLOP = vc.getScaledTouchSlop();
    TAP_TIMEOUT = ViewConfiguration.getTapTimeout();
    mDoingMove = false;

    mCircleView = new CircleView(context);
    addView(mCircleView);

    mAmPmCirclesView = new AmPmCirclesView(context);
    addView(mAmPmCirclesView);

    mHourRadialTextsView = new RadialTextsView(context);
    addView(mHourRadialTextsView);
    mMinuteRadialTextsView = new RadialTextsView(context);
    addView(mMinuteRadialTextsView);

    mHourRadialSelectorView = new RadialSelectorView(context);
    addView(mHourRadialSelectorView);
    mMinuteRadialSelectorView = new RadialSelectorView(context);
    addView(mMinuteRadialSelectorView);

    // Prepare mapping to snap touchable degrees to selectable degrees.
    preparePrefer30sMap();

    mVibrator = (Vibrator) context.getSystemService(Service.VIBRATOR_SERVICE);
    mLastVibrate = 0;
    mLastValueSelected = -1;

    mInputEnabled = true;
    mGrayBox = new View(context);
    mGrayBox.setLayoutParams(new ViewGroup.LayoutParams(
            ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
    mGrayBox.setBackgroundColor(getResources().getColor(R.color.transparent_black));
    mGrayBox.setVisibility(View.INVISIBLE);
    addView(mGrayBox);

    mAccessibilityManager = (AccessibilityManager) context.getSystemService(Context.ACCESSIBILITY_SERVICE);

    mTimeInitialized = false;
}
 

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

    //Load defaults from resources
    Resources res = getResources();
    final int defaultPageColor = ContextCompat.getColor(getContext(), R.color.default_circle_indicator_page_color);
    final int defaultFillColor = ContextCompat.getColor(getContext(), R.color.default_circle_indicator_fill_color);
    final int defaultOrientation = res.getInteger(R.integer.default_circle_indicator_orientation);
    final int defaultStrokeColor = ContextCompat.getColor(getContext(), R.color.default_circle_indicator_stroke_color);
    final float defaultExtraSpacing = res.getDimension(R.dimen.default_circle_indicator_extra_spacing);
    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);
    mExtraSpacing = a.getDimension(R.styleable.CirclePageIndicator_extraSpacing, defaultExtraSpacing);

    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);
}
 

/**
 * Sets the sensitivity of the dragger.
 *
 * @param context     The application context.
 * @param sensitivity value between 0 and 1, the final value for touchSlop =
 *                    ViewConfiguration.getScaledTouchSlop * (1 / s);
 */
public void setSensitivity(Context context, float sensitivity) {
    float s = Math.max(0f, Math.min(1.0f, sensitivity));
    ViewConfiguration viewConfiguration = ViewConfiguration.get(context);
    mTouchSlop = (int) (viewConfiguration.getScaledTouchSlop() * (1 / s));
}