Java tutorial
/* * Copyright (C) 2012 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. */ package com.klinker.deskclock.widget.multiwaveview; import android.animation.Animator; import android.animation.Animator.AnimatorListener; import android.animation.AnimatorListenerAdapter; import android.animation.TimeInterpolator; import android.animation.ValueAnimator; import android.animation.ValueAnimator.AnimatorUpdateListener; import android.content.ComponentName; import android.content.Context; import android.content.pm.PackageManager; import android.content.pm.PackageManager.NameNotFoundException; import android.content.res.Resources; import android.content.res.TypedArray; import android.graphics.Canvas; import android.graphics.drawable.Drawable; import android.os.Build; import android.os.Bundle; import android.os.Vibrator; import android.support.v4.view.accessibility.AccessibilityRecordCompat; import android.text.TextUtils; import android.util.AttributeSet; import android.util.Log; import android.util.TypedValue; import android.view.Gravity; import android.view.MotionEvent; import android.view.View; import android.view.accessibility.AccessibilityEvent; import android.view.accessibility.AccessibilityManager; import com.klinker.deskclock.R; import java.util.ArrayList; /** * This is a copy of com.android.internal.widget.multiwaveview.GlowPadView with minor changes * to remove dependencies on private api's. * * Contains changes up to If296b60af2421bfa1a9a082e608ba77b2392a218 * * A re-usable widget containing a center, outer ring and wave animation. */ public class GlowPadView extends View { private static final String TAG = "GlowPadView"; private static final boolean DEBUG = false; // Wave state machine private static final int STATE_IDLE = 0; private static final int STATE_START = 1; private static final int STATE_FIRST_TOUCH = 2; private static final int STATE_TRACKING = 3; private static final int STATE_SNAP = 4; private static final int STATE_FINISH = 5; // Animation properties. private static final float SNAP_MARGIN_DEFAULT = 20.0f; // distance to ring before we snap to it public interface OnTriggerListener { int NO_HANDLE = 0; int CENTER_HANDLE = 1; public void onGrabbed(View v, int handle); public void onReleased(View v, int handle); public void onTrigger(View v, int target); public void onGrabbedStateChange(View v, int handle); public void onFinishFinalAnimation(); } // Tuneable parameters for animation private static final int WAVE_ANIMATION_DURATION = 1350; private static final int RETURN_TO_HOME_DELAY = 1200; private static final int RETURN_TO_HOME_DURATION = 200; private static final int HIDE_ANIMATION_DELAY = 200; private static final int HIDE_ANIMATION_DURATION = 200; private static final int SHOW_ANIMATION_DURATION = 200; private static final int SHOW_ANIMATION_DELAY = 50; private static final int INITIAL_SHOW_HANDLE_DURATION = 200; private static final int REVEAL_GLOW_DELAY = 0; private static final int REVEAL_GLOW_DURATION = 0; private static final float TAP_RADIUS_SCALE_ACCESSIBILITY_ENABLED = 1.3f; private static final float TARGET_SCALE_EXPANDED = 1.0f; private static final float TARGET_SCALE_COLLAPSED = 0.8f; private static final float RING_SCALE_EXPANDED = 1.0f; private static final float RING_SCALE_COLLAPSED = 0.5f; private ArrayList<TargetDrawable> mTargetDrawables = new ArrayList<TargetDrawable>(); private AnimationBundle mWaveAnimations = new AnimationBundle(); private AnimationBundle mTargetAnimations = new AnimationBundle(); private AnimationBundle mGlowAnimations = new AnimationBundle(); private ArrayList<String> mTargetDescriptions; private ArrayList<String> mDirectionDescriptions; private OnTriggerListener mOnTriggerListener; private TargetDrawable mHandleDrawable; private TargetDrawable mOuterRing; private Vibrator mVibrator; private int mFeedbackCount = 3; private int mVibrationDuration = 0; private int mGrabbedState; private int mActiveTarget = -1; private float mGlowRadius; private float mWaveCenterX; private float mWaveCenterY; private int mMaxTargetHeight; private int mMaxTargetWidth; private float mOuterRadius = 0.0f; private float mSnapMargin = 0.0f; private boolean mDragging; private int mNewTargetResources; private class AnimationBundle extends ArrayList<Tweener> { private static final long serialVersionUID = 0xA84D78726F127468L; private boolean mSuspended; public void start() { if (mSuspended) return; // ignore attempts to start animations final int count = size(); for (int i = 0; i < count; i++) { Tweener anim = get(i); anim.animator.start(); } } public void cancel() { final int count = size(); for (int i = 0; i < count; i++) { Tweener anim = get(i); anim.animator.cancel(); } clear(); } public void stop() { final int count = size(); for (int i = 0; i < count; i++) { Tweener anim = get(i); anim.animator.end(); } clear(); } public void setSuspended(boolean suspend) { mSuspended = suspend; } }; private AnimatorListener mResetListener = new AnimatorListenerAdapter() { public void onAnimationEnd(Animator animator) { switchToState(STATE_IDLE, mWaveCenterX, mWaveCenterY); dispatchOnFinishFinalAnimation(); } }; private AnimatorListener mResetListenerWithPing = new AnimatorListenerAdapter() { public void onAnimationEnd(Animator animator) { ping(); switchToState(STATE_IDLE, mWaveCenterX, mWaveCenterY); dispatchOnFinishFinalAnimation(); } }; private AnimatorUpdateListener mUpdateListener = new AnimatorUpdateListener() { public void onAnimationUpdate(ValueAnimator animation) { invalidate(); } }; private boolean mAnimatingTargets; private AnimatorListener mTargetUpdateListener = new AnimatorListenerAdapter() { public void onAnimationEnd(Animator animator) { if (mNewTargetResources != 0) { internalSetTargetResources(mNewTargetResources); mNewTargetResources = 0; hideTargets(false, false); } mAnimatingTargets = false; } }; private int mTargetResourceId; private int mTargetDescriptionsResourceId; private int mDirectionDescriptionsResourceId; private boolean mAlwaysTrackFinger; private int mHorizontalInset; private int mVerticalInset; private int mGravity = Gravity.TOP; private boolean mInitialLayout = true; private Tweener mBackgroundAnimator; private PointCloud mPointCloud; private float mInnerRadius; private int mPointerId; public GlowPadView(Context context) { this(context, null); } public GlowPadView(Context context, AttributeSet attrs) { super(context, attrs); Resources res = context.getResources(); TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.GlowPadView); mInnerRadius = a.getDimension(R.styleable.GlowPadView_innerRadius, mInnerRadius); mOuterRadius = a.getDimension(R.styleable.GlowPadView_outerRadius, mOuterRadius); mSnapMargin = a.getDimension(R.styleable.GlowPadView_snapMargin, mSnapMargin); mVibrationDuration = a.getInt(R.styleable.GlowPadView_vibrationDuration, mVibrationDuration); mFeedbackCount = a.getInt(R.styleable.GlowPadView_feedbackCount, mFeedbackCount); TypedValue handle = a.peekValue(R.styleable.GlowPadView_handleDrawable); mHandleDrawable = new TargetDrawable(res, handle != null ? handle.resourceId : 0, 2); mHandleDrawable.setState(TargetDrawable.STATE_INACTIVE); mOuterRing = new TargetDrawable(res, getResourceId(a, R.styleable.GlowPadView_outerRingDrawable), 1); mAlwaysTrackFinger = a.getBoolean(R.styleable.GlowPadView_alwaysTrackFinger, false); int pointId = getResourceId(a, R.styleable.GlowPadView_pointDrawable); Drawable pointDrawable = pointId != 0 ? res.getDrawable(pointId) : null; mGlowRadius = a.getDimension(R.styleable.GlowPadView_glowRadius, 0.0f); TypedValue outValue = new TypedValue(); // Read array of target drawables if (a.getValue(R.styleable.GlowPadView_targetDrawables, outValue)) { internalSetTargetResources(outValue.resourceId); } if (mTargetDrawables == null || mTargetDrawables.size() == 0) { throw new IllegalStateException("Must specify at least one target drawable"); } // Read array of target descriptions if (a.getValue(R.styleable.GlowPadView_targetDescriptions, outValue)) { final int resourceId = outValue.resourceId; if (resourceId == 0) { throw new IllegalStateException("Must specify target descriptions"); } setTargetDescriptionsResourceId(resourceId); } // Read array of direction descriptions if (a.getValue(R.styleable.GlowPadView_directionDescriptions, outValue)) { final int resourceId = outValue.resourceId; if (resourceId == 0) { throw new IllegalStateException("Must specify direction descriptions"); } setDirectionDescriptionsResourceId(resourceId); } a.recycle(); // Use gravity attribute from LinearLayout //a = context.obtainStyledAttributes(attrs, R.styleable.LinearLayout); mGravity = a.getInt(R.styleable.GlowPadView_android_gravity, Gravity.TOP); a.recycle(); setVibrateEnabled(mVibrationDuration > 0); assignDefaultsIfNeeded(); mPointCloud = new PointCloud(pointDrawable); mPointCloud.makePointCloud(mInnerRadius, mOuterRadius); mPointCloud.glowManager.setRadius(mGlowRadius); } private int getResourceId(TypedArray a, int id) { TypedValue tv = a.peekValue(id); return tv == null ? 0 : tv.resourceId; } private void dump() { Log.v(TAG, "Outer Radius = " + mOuterRadius); Log.v(TAG, "SnapMargin = " + mSnapMargin); Log.v(TAG, "FeedbackCount = " + mFeedbackCount); Log.v(TAG, "VibrationDuration = " + mVibrationDuration); Log.v(TAG, "GlowRadius = " + mGlowRadius); Log.v(TAG, "WaveCenterX = " + mWaveCenterX); Log.v(TAG, "WaveCenterY = " + mWaveCenterY); } public void suspendAnimations() { mWaveAnimations.setSuspended(true); mTargetAnimations.setSuspended(true); mGlowAnimations.setSuspended(true); } public void resumeAnimations() { mWaveAnimations.setSuspended(false); mTargetAnimations.setSuspended(false); mGlowAnimations.setSuspended(false); mWaveAnimations.start(); mTargetAnimations.start(); mGlowAnimations.start(); } @Override protected int getSuggestedMinimumWidth() { // View should be large enough to contain the background + handle and // target drawable on either edge. return (int) (Math.max(mOuterRing.getWidth(), 2 * mOuterRadius) + mMaxTargetWidth); } @Override protected int getSuggestedMinimumHeight() { // View should be large enough to contain the unlock ring + target and // target drawable on either edge return (int) (Math.max(mOuterRing.getHeight(), 2 * mOuterRadius) + mMaxTargetHeight); } private int resolveMeasured(int measureSpec, int desired) { int result = 0; int specSize = MeasureSpec.getSize(measureSpec); switch (MeasureSpec.getMode(measureSpec)) { case MeasureSpec.UNSPECIFIED: result = desired; break; case MeasureSpec.AT_MOST: result = Math.min(specSize, desired); break; case MeasureSpec.EXACTLY: default: result = specSize; } return result; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { final int minimumWidth = getSuggestedMinimumWidth(); final int minimumHeight = getSuggestedMinimumHeight(); int computedWidth = resolveMeasured(widthMeasureSpec, minimumWidth); int computedHeight = resolveMeasured(heightMeasureSpec, minimumHeight); computeInsets((computedWidth - minimumWidth), (computedHeight - minimumHeight)); setMeasuredDimension(computedWidth, computedHeight); } private void switchToState(int state, float x, float y) { switch (state) { case STATE_IDLE: deactivateTargets(); hideGlow(0, 0, 0.0f, null); startBackgroundAnimation(0, 0.0f); mHandleDrawable.setState(TargetDrawable.STATE_INACTIVE); mHandleDrawable.setAlpha(1.0f); break; case STATE_START: startBackgroundAnimation(0, 0.0f); break; case STATE_FIRST_TOUCH: mHandleDrawable.setAlpha(0.0f); deactivateTargets(); showTargets(true); startBackgroundAnimation(INITIAL_SHOW_HANDLE_DURATION, 1.0f); setGrabbedState(OnTriggerListener.CENTER_HANDLE); final AccessibilityManager accessibilityManager = (AccessibilityManager) getContext() .getSystemService(Context.ACCESSIBILITY_SERVICE); if (accessibilityManager.isEnabled()) { announceTargets(); } break; case STATE_TRACKING: mHandleDrawable.setAlpha(0.0f); showGlow(REVEAL_GLOW_DURATION, REVEAL_GLOW_DELAY, 1.0f, null); break; case STATE_SNAP: // TODO: Add transition states (see list_selector_background_transition.xml) mHandleDrawable.setAlpha(0.0f); showGlow(REVEAL_GLOW_DURATION, REVEAL_GLOW_DELAY, 0.0f, null); break; case STATE_FINISH: doFinish(); break; } } private void showGlow(int duration, int delay, float finalAlpha, AnimatorListener finishListener) { mGlowAnimations.cancel(); mGlowAnimations.add(Tweener.to(mPointCloud.glowManager, duration, "ease", Ease.Cubic.easeIn, "delay", delay, "alpha", finalAlpha, "onUpdate", mUpdateListener, "onComplete", finishListener)); mGlowAnimations.start(); } private void hideGlow(int duration, int delay, float finalAlpha, AnimatorListener finishListener) { mGlowAnimations.cancel(); mGlowAnimations.add(Tweener.to(mPointCloud.glowManager, duration, "ease", Ease.Quart.easeOut, "delay", delay, "alpha", finalAlpha, "x", 0.0f, "y", 0.0f, "onUpdate", mUpdateListener, "onComplete", finishListener)); mGlowAnimations.start(); } private void deactivateTargets() { final int count = mTargetDrawables.size(); for (int i = 0; i < count; i++) { TargetDrawable target = mTargetDrawables.get(i); target.setState(TargetDrawable.STATE_INACTIVE); } mActiveTarget = -1; } /** * Dispatches a trigger event to listener. Ignored if a listener is not set. * @param whichTarget the target that was triggered. */ private void dispatchTriggerEvent(int whichTarget) { vibrate(); if (mOnTriggerListener != null) { mOnTriggerListener.onTrigger(this, whichTarget); } } private void dispatchOnFinishFinalAnimation() { if (mOnTriggerListener != null) { mOnTriggerListener.onFinishFinalAnimation(); } } private void doFinish() { final int activeTarget = mActiveTarget; final boolean targetHit = activeTarget != -1; if (targetHit) { if (DEBUG) Log.v(TAG, "Finish with target hit = " + targetHit); highlightSelected(activeTarget); // Inform listener of any active targets. Typically only one will be active. hideGlow(RETURN_TO_HOME_DURATION, RETURN_TO_HOME_DELAY, 0.0f, mResetListener); dispatchTriggerEvent(activeTarget); if (!mAlwaysTrackFinger) { // Force ring and targets to finish animation to final expanded state mTargetAnimations.stop(); } } else { // Animate handle back to the center based on current state. hideGlow(HIDE_ANIMATION_DURATION, 0, 0.0f, mResetListenerWithPing); hideTargets(true, false); } setGrabbedState(OnTriggerListener.NO_HANDLE); } private void highlightSelected(int activeTarget) { // Highlight the given target and fade others mTargetDrawables.get(activeTarget).setState(TargetDrawable.STATE_ACTIVE); hideUnselected(activeTarget); } private void hideUnselected(int active) { for (int i = 0; i < mTargetDrawables.size(); i++) { if (i != active) { mTargetDrawables.get(i).setAlpha(0.0f); } } } private void hideTargets(boolean animate, boolean expanded) { mTargetAnimations.cancel(); // Note: these animations should complete at the same time so that we can swap out // the target assets asynchronously from the setTargetResources() call. mAnimatingTargets = animate; final int duration = animate ? HIDE_ANIMATION_DURATION : 0; final int delay = animate ? HIDE_ANIMATION_DELAY : 0; final float targetScale = expanded ? TARGET_SCALE_EXPANDED : TARGET_SCALE_COLLAPSED; final int length = mTargetDrawables.size(); final TimeInterpolator interpolator = Ease.Cubic.easeOut; for (int i = 0; i < length; i++) { TargetDrawable target = mTargetDrawables.get(i); target.setState(TargetDrawable.STATE_INACTIVE); mTargetAnimations.add(Tweener.to(target, duration, "ease", interpolator, "alpha", 0.0f, "scaleX", targetScale, "scaleY", targetScale, "delay", delay, "onUpdate", mUpdateListener)); } final float ringScaleTarget = expanded ? RING_SCALE_EXPANDED : RING_SCALE_COLLAPSED; mTargetAnimations.add(Tweener.to(mOuterRing, duration, "ease", interpolator, "alpha", 0.0f, "scaleX", ringScaleTarget, "scaleY", ringScaleTarget, "delay", delay, "onUpdate", mUpdateListener, "onComplete", mTargetUpdateListener)); mTargetAnimations.start(); } private void showTargets(boolean animate) { mTargetAnimations.stop(); mAnimatingTargets = animate; final int delay = animate ? SHOW_ANIMATION_DELAY : 0; final int duration = animate ? SHOW_ANIMATION_DURATION : 0; final int length = mTargetDrawables.size(); for (int i = 0; i < length; i++) { TargetDrawable target = mTargetDrawables.get(i); target.setState(TargetDrawable.STATE_INACTIVE); mTargetAnimations.add(Tweener.to(target, duration, "ease", Ease.Cubic.easeOut, "alpha", 1.0f, "scaleX", 1.0f, "scaleY", 1.0f, "delay", delay, "onUpdate", mUpdateListener)); } mTargetAnimations.add(Tweener.to(mOuterRing, duration, "ease", Ease.Cubic.easeOut, "alpha", 1.0f, "scaleX", 1.0f, "scaleY", 1.0f, "delay", delay, "onUpdate", mUpdateListener, "onComplete", mTargetUpdateListener)); mTargetAnimations.start(); } private void vibrate() { if (mVibrator != null) { mVibrator.vibrate(mVibrationDuration); } } private ArrayList<TargetDrawable> loadDrawableArray(int resourceId) { Resources res = getContext().getResources(); TypedArray array = res.obtainTypedArray(resourceId); final int count = array.length(); ArrayList<TargetDrawable> drawables = new ArrayList<TargetDrawable>(count); for (int i = 0; i < count; i++) { TypedValue value = array.peekValue(i); TargetDrawable target = new TargetDrawable(res, value != null ? value.resourceId : 0, 3); drawables.add(target); } array.recycle(); return drawables; } private void internalSetTargetResources(int resourceId) { final ArrayList<TargetDrawable> targets = loadDrawableArray(resourceId); mTargetDrawables = targets; mTargetResourceId = resourceId; int maxWidth = mHandleDrawable.getWidth(); int maxHeight = mHandleDrawable.getHeight(); final int count = targets.size(); for (int i = 0; i < count; i++) { TargetDrawable target = targets.get(i); maxWidth = Math.max(maxWidth, target.getWidth()); maxHeight = Math.max(maxHeight, target.getHeight()); } if (mMaxTargetWidth != maxWidth || mMaxTargetHeight != maxHeight) { mMaxTargetWidth = maxWidth; mMaxTargetHeight = maxHeight; requestLayout(); // required to resize layout and call updateTargetPositions() } else { updateTargetPositions(mWaveCenterX, mWaveCenterY); updatePointCloudPosition(mWaveCenterX, mWaveCenterY); } } /** * Loads an array of drawables from the given resourceId. * * @param resourceId */ public void setTargetResources(int resourceId) { if (mAnimatingTargets) { // postpone this change until we return to the initial state mNewTargetResources = resourceId; } else { internalSetTargetResources(resourceId); } } public int getTargetResourceId() { return mTargetResourceId; } /** * Sets the resource id specifying the target descriptions for accessibility. * * @param resourceId The resource id. */ public void setTargetDescriptionsResourceId(int resourceId) { mTargetDescriptionsResourceId = resourceId; if (mTargetDescriptions != null) { mTargetDescriptions.clear(); } } /** * Gets the resource id specifying the target descriptions for accessibility. * * @return The resource id. */ public int getTargetDescriptionsResourceId() { return mTargetDescriptionsResourceId; } /** * Sets the resource id specifying the target direction descriptions for accessibility. * * @param resourceId The resource id. */ public void setDirectionDescriptionsResourceId(int resourceId) { mDirectionDescriptionsResourceId = resourceId; if (mDirectionDescriptions != null) { mDirectionDescriptions.clear(); } } /** * Gets the resource id specifying the target direction descriptions. * * @return The resource id. */ public int getDirectionDescriptionsResourceId() { return mDirectionDescriptionsResourceId; } /** * Enable or disable vibrate on touch. * * @param enabled */ public void setVibrateEnabled(boolean enabled) { if (enabled && mVibrator == null) { mVibrator = (Vibrator) getContext().getSystemService(Context.VIBRATOR_SERVICE); } else { mVibrator = null; } } /** * Starts wave animation. * */ public void ping() { if (mFeedbackCount > 0) { boolean doWaveAnimation = true; final AnimationBundle waveAnimations = mWaveAnimations; // Don't do a wave if there's already one in progress if (waveAnimations.size() > 0 && waveAnimations.get(0).animator.isRunning()) { long t = waveAnimations.get(0).animator.getCurrentPlayTime(); if (t < WAVE_ANIMATION_DURATION / 2) { doWaveAnimation = false; } } if (doWaveAnimation) { startWaveAnimation(); } } } private void stopAndHideWaveAnimation() { mWaveAnimations.cancel(); mPointCloud.waveManager.setAlpha(0.0f); } private void startWaveAnimation() { mWaveAnimations.cancel(); mPointCloud.waveManager.setAlpha(1.0f); mPointCloud.waveManager.setRadius(mHandleDrawable.getWidth() / 2.0f); mWaveAnimations.add(Tweener.to(mPointCloud.waveManager, WAVE_ANIMATION_DURATION, "ease", Ease.Quad.easeOut, "delay", 0, "radius", 2.0f * mOuterRadius, "onUpdate", mUpdateListener, "onComplete", new AnimatorListenerAdapter() { public void onAnimationEnd(Animator animator) { mPointCloud.waveManager.setRadius(0.0f); mPointCloud.waveManager.setAlpha(0.0f); } })); mWaveAnimations.start(); } /** * Resets the widget to default state and cancels all animation. If animate is 'true', will * animate objects into place. Otherwise, objects will snap back to place. * * @param animate */ public void reset(boolean animate) { mGlowAnimations.stop(); mTargetAnimations.stop(); startBackgroundAnimation(0, 0.0f); stopAndHideWaveAnimation(); hideTargets(animate, false); hideGlow(0, 0, 0.0f, null); Tweener.reset(); } private void startBackgroundAnimation(int duration, float alpha) { final Drawable background = getBackground(); if (mAlwaysTrackFinger && background != null) { if (mBackgroundAnimator != null) { mBackgroundAnimator.animator.cancel(); } mBackgroundAnimator = Tweener.to(background, duration, "ease", Ease.Cubic.easeIn, "alpha", (int) (255.0f * alpha), "delay", SHOW_ANIMATION_DELAY); mBackgroundAnimator.animator.start(); } } @Override public boolean onTouchEvent(MotionEvent event) { final int action = event.getActionMasked(); boolean handled = false; switch (action) { case MotionEvent.ACTION_POINTER_DOWN: case MotionEvent.ACTION_DOWN: if (DEBUG) Log.v(TAG, "*** DOWN ***"); handleDown(event); handleMove(event); handled = true; break; case MotionEvent.ACTION_MOVE: if (DEBUG) Log.v(TAG, "*** MOVE ***"); handleMove(event); handled = true; break; case MotionEvent.ACTION_POINTER_UP: case MotionEvent.ACTION_UP: if (DEBUG) Log.v(TAG, "*** UP ***"); handleMove(event); handleUp(event); handled = true; break; case MotionEvent.ACTION_CANCEL: if (DEBUG) Log.v(TAG, "*** CANCEL ***"); handleMove(event); handleCancel(event); handled = true; break; } invalidate(); return handled ? true : super.onTouchEvent(event); } private void updateGlowPosition(float x, float y) { mPointCloud.glowManager.setX(x); mPointCloud.glowManager.setY(y); } private void handleDown(MotionEvent event) { int actionIndex = event.getActionIndex(); float eventX = event.getX(actionIndex); float eventY = event.getY(actionIndex); switchToState(STATE_START, eventX, eventY); if (!trySwitchToFirstTouchState(eventX, eventY)) { mDragging = false; } else { mPointerId = event.getPointerId(actionIndex); updateGlowPosition(eventX, eventY); } } private void handleUp(MotionEvent event) { if (DEBUG && mDragging) Log.v(TAG, "** Handle RELEASE"); int actionIndex = event.getActionIndex(); if (event.getPointerId(actionIndex) == mPointerId) { switchToState(STATE_FINISH, event.getX(actionIndex), event.getY(actionIndex)); } } private void handleCancel(MotionEvent event) { if (DEBUG && mDragging) Log.v(TAG, "** Handle CANCEL"); // We should drop the active target here but it interferes with // moving off the screen in the direction of the navigation bar. At some point we may // want to revisit how we handle this. For now we'll allow a canceled event to // activate the current target. // mActiveTarget = -1; // Drop the active target if canceled. int actionIndex = event.findPointerIndex(mPointerId); actionIndex = actionIndex == -1 ? 0 : actionIndex; switchToState(STATE_FINISH, event.getX(actionIndex), event.getY(actionIndex)); } private void handleMove(MotionEvent event) { int activeTarget = -1; final int historySize = event.getHistorySize(); ArrayList<TargetDrawable> targets = mTargetDrawables; int ntargets = targets.size(); float x = 0.0f; float y = 0.0f; int actionIndex = event.findPointerIndex(mPointerId); if (actionIndex == -1) { return; // no data for this pointer } for (int k = 0; k < historySize + 1; k++) { float eventX = k < historySize ? event.getHistoricalX(actionIndex, k) : event.getX(actionIndex); float eventY = k < historySize ? event.getHistoricalY(actionIndex, k) : event.getY(actionIndex); // tx and ty are relative to wave center float tx = eventX - mWaveCenterX; float ty = eventY - mWaveCenterY; float touchRadius = (float) Math.sqrt(dist2(tx, ty)); final float scale = touchRadius > mOuterRadius ? mOuterRadius / touchRadius : 1.0f; float limitX = tx * scale; float limitY = ty * scale; double angleRad = Math.atan2(-ty, tx); if (!mDragging) { trySwitchToFirstTouchState(eventX, eventY); } if (mDragging) { // For multiple targets, snap to the one that matches final float snapRadius = mOuterRadius - mSnapMargin; final float snapDistance2 = snapRadius * snapRadius; // Find first target in range for (int i = 0; i < ntargets; i++) { TargetDrawable target = targets.get(i); double targetMinRad = (i - 0.5) * 2 * Math.PI / ntargets; double targetMaxRad = (i + 0.5) * 2 * Math.PI / ntargets; if (target.isEnabled()) { boolean angleMatches = (angleRad > targetMinRad && angleRad <= targetMaxRad) || (angleRad + 2 * Math.PI > targetMinRad && angleRad + 2 * Math.PI <= targetMaxRad); if (angleMatches && (dist2(tx, ty) > snapDistance2)) { activeTarget = i; } } } } x = limitX; y = limitY; } if (!mDragging) { return; } if (activeTarget != -1) { switchToState(STATE_SNAP, x, y); updateGlowPosition(x, y); } else { switchToState(STATE_TRACKING, x, y); updateGlowPosition(x, y); } if (mActiveTarget != activeTarget) { // Defocus the old target if (mActiveTarget != -1) { TargetDrawable target = targets.get(mActiveTarget); target.setState(TargetDrawable.STATE_INACTIVE); } // Focus the new target if (activeTarget != -1) { TargetDrawable target = targets.get(activeTarget); target.setState(TargetDrawable.STATE_FOCUSED); final AccessibilityManager accessibilityManager = (AccessibilityManager) getContext() .getSystemService(Context.ACCESSIBILITY_SERVICE); if (accessibilityManager.isEnabled()) { String targetContentDescription = getTargetDescription(activeTarget); if (Build.VERSION.SDK_INT >= 16) { announceForAccessibility(targetContentDescription); } else { AccessibilityEvent acc_event = AccessibilityEvent .obtain(AccessibilityEvent.TYPE_NOTIFICATION_STATE_CHANGED); AccessibilityRecordCompat arc = new AccessibilityRecordCompat(acc_event); arc.setSource(this); acc_event.setClassName(this.getClass().getName()); acc_event.setPackageName(this.getContext().getPackageName()); acc_event.setEnabled(this.isEnabled()); acc_event.getText().add(targetContentDescription); accessibilityManager.sendAccessibilityEvent(acc_event); } } } } mActiveTarget = activeTarget; } @Override public boolean onHoverEvent(MotionEvent event) { final AccessibilityManager accessibilityManager = (AccessibilityManager) getContext() .getSystemService(Context.ACCESSIBILITY_SERVICE); if (accessibilityManager.isTouchExplorationEnabled()) { final int action = event.getAction(); switch (action) { case MotionEvent.ACTION_HOVER_ENTER: event.setAction(MotionEvent.ACTION_DOWN); break; case MotionEvent.ACTION_HOVER_MOVE: event.setAction(MotionEvent.ACTION_MOVE); break; case MotionEvent.ACTION_HOVER_EXIT: event.setAction(MotionEvent.ACTION_UP); break; } onTouchEvent(event); event.setAction(action); } super.onHoverEvent(event); return true; } /** * Sets the current grabbed state, and dispatches a grabbed state change * event to our listener. */ private void setGrabbedState(int newState) { if (newState != mGrabbedState) { if (newState != OnTriggerListener.NO_HANDLE) { vibrate(); } mGrabbedState = newState; if (mOnTriggerListener != null) { if (newState == OnTriggerListener.NO_HANDLE) { mOnTriggerListener.onReleased(this, OnTriggerListener.CENTER_HANDLE); } else { mOnTriggerListener.onGrabbed(this, OnTriggerListener.CENTER_HANDLE); } mOnTriggerListener.onGrabbedStateChange(this, newState); } } } private boolean trySwitchToFirstTouchState(float x, float y) { final float tx = x - mWaveCenterX; final float ty = y - mWaveCenterY; if (mAlwaysTrackFinger || dist2(tx, ty) <= getScaledGlowRadiusSquared()) { if (DEBUG) Log.v(TAG, "** Handle HIT"); switchToState(STATE_FIRST_TOUCH, x, y); updateGlowPosition(tx, ty); mDragging = true; return true; } return false; } private void assignDefaultsIfNeeded() { if (mOuterRadius == 0.0f) { mOuterRadius = Math.max(mOuterRing.getWidth(), mOuterRing.getHeight()) / 2.0f; } if (mSnapMargin == 0.0f) { mSnapMargin = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, SNAP_MARGIN_DEFAULT, getContext().getResources().getDisplayMetrics()); } if (mInnerRadius == 0.0f) { mInnerRadius = mHandleDrawable.getWidth() / 10.0f; } } private void computeInsets(int dx, int dy) { final int layoutDirection = getLayoutDirection(); final int absoluteGravity = Gravity.getAbsoluteGravity(mGravity, layoutDirection); switch (absoluteGravity & Gravity.HORIZONTAL_GRAVITY_MASK) { case Gravity.LEFT: mHorizontalInset = 0; break; case Gravity.RIGHT: mHorizontalInset = dx; break; case Gravity.CENTER_HORIZONTAL: default: mHorizontalInset = dx / 2; break; } switch (absoluteGravity & Gravity.VERTICAL_GRAVITY_MASK) { case Gravity.TOP: mVerticalInset = 0; break; case Gravity.BOTTOM: mVerticalInset = dy; break; case Gravity.CENTER_VERTICAL: default: mVerticalInset = dy / 2; break; } } @Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) { super.onLayout(changed, left, top, right, bottom); final int width = right - left; final int height = bottom - top; // Target placement width/height. This puts the targets on the greater of the ring // width or the specified outer radius. final float placementWidth = Math.max(mOuterRing.getWidth(), 2 * mOuterRadius); final float placementHeight = Math.max(mOuterRing.getHeight(), 2 * mOuterRadius); float newWaveCenterX = mHorizontalInset + Math.max(width, mMaxTargetWidth + placementWidth) / 2; float newWaveCenterY = mVerticalInset + Math.max(height, +mMaxTargetHeight + placementHeight) / 2; if (mInitialLayout) { stopAndHideWaveAnimation(); hideTargets(false, false); mInitialLayout = false; } mOuterRing.setPositionX(newWaveCenterX); mOuterRing.setPositionY(newWaveCenterY); mHandleDrawable.setPositionX(newWaveCenterX); mHandleDrawable.setPositionY(newWaveCenterY); updateTargetPositions(newWaveCenterX, newWaveCenterY); updatePointCloudPosition(newWaveCenterX, newWaveCenterY); updateGlowPosition(newWaveCenterX, newWaveCenterY); mWaveCenterX = newWaveCenterX; mWaveCenterY = newWaveCenterY; if (DEBUG) dump(); } private void updateTargetPositions(float centerX, float centerY) { // Reposition the target drawables if the view changed. ArrayList<TargetDrawable> targets = mTargetDrawables; final int size = targets.size(); final float alpha = (float) (-2.0f * Math.PI / size); for (int i = 0; i < size; i++) { final TargetDrawable targetIcon = targets.get(i); final float angle = alpha * i; targetIcon.setPositionX(centerX); targetIcon.setPositionY(centerY); targetIcon.setX(mOuterRadius * (float) Math.cos(angle)); targetIcon.setY(mOuterRadius * (float) Math.sin(angle)); } } private void updatePointCloudPosition(float centerX, float centerY) { mPointCloud.setCenter(centerX, centerY); } @Override protected void onDraw(Canvas canvas) { mPointCloud.draw(canvas); mOuterRing.draw(canvas); final int ntargets = mTargetDrawables.size(); for (int i = 0; i < ntargets; i++) { TargetDrawable target = mTargetDrawables.get(i); if (target != null) { target.draw(canvas); } } mHandleDrawable.draw(canvas); } public void setOnTriggerListener(OnTriggerListener listener) { mOnTriggerListener = listener; } private float square(float d) { return d * d; } private float dist2(float dx, float dy) { return dx * dx + dy * dy; } private float getScaledGlowRadiusSquared() { final float scaledTapRadius; final AccessibilityManager accessibilityManager = (AccessibilityManager) getContext() .getSystemService(Context.ACCESSIBILITY_SERVICE); if (accessibilityManager.isEnabled()) { scaledTapRadius = TAP_RADIUS_SCALE_ACCESSIBILITY_ENABLED * mGlowRadius; } else { scaledTapRadius = mGlowRadius; } return square(scaledTapRadius); } private void announceTargets() { StringBuilder utterance = new StringBuilder(); final int targetCount = mTargetDrawables.size(); for (int i = 0; i < targetCount; i++) { String targetDescription = getTargetDescription(i); String directionDescription = getDirectionDescription(i); if (!TextUtils.isEmpty(targetDescription) && !TextUtils.isEmpty(directionDescription)) { String text = String.format(directionDescription, targetDescription); utterance.append(text); } } if (utterance.length() > 0) { final AccessibilityManager accessibilityManager = (AccessibilityManager) getContext() .getSystemService(Context.ACCESSIBILITY_SERVICE); if (accessibilityManager.isEnabled()) { if (Build.VERSION.SDK_INT >= 16) { announceForAccessibility(utterance.toString()); } else { AccessibilityEvent acc_event = AccessibilityEvent .obtain(AccessibilityEvent.TYPE_NOTIFICATION_STATE_CHANGED); AccessibilityRecordCompat arc = new AccessibilityRecordCompat(acc_event); arc.setSource(this); acc_event.setClassName(this.getClass().getName()); acc_event.setPackageName(this.getContext().getPackageName()); acc_event.setEnabled(this.isEnabled()); acc_event.getText().add(utterance.toString()); accessibilityManager.sendAccessibilityEvent(acc_event); } } } } private String getTargetDescription(int index) { if (mTargetDescriptions == null || mTargetDescriptions.isEmpty()) { mTargetDescriptions = loadDescriptions(mTargetDescriptionsResourceId); if (mTargetDrawables.size() != mTargetDescriptions.size()) { Log.w(TAG, "The number of target drawables must be" + " equal to the number of target descriptions."); return null; } } return mTargetDescriptions.get(index); } private String getDirectionDescription(int index) { if (mDirectionDescriptions == null || mDirectionDescriptions.isEmpty()) { mDirectionDescriptions = loadDescriptions(mDirectionDescriptionsResourceId); if (mTargetDrawables.size() != mDirectionDescriptions.size()) { Log.w(TAG, "The number of target drawables must be" + " equal to the number of direction descriptions."); return null; } } return mDirectionDescriptions.get(index); } private ArrayList<String> loadDescriptions(int resourceId) { TypedArray array = getContext().getResources().obtainTypedArray(resourceId); final int count = array.length(); ArrayList<String> targetContentDescriptions = new ArrayList<String>(count); for (int i = 0; i < count; i++) { String contentDescription = array.getString(i); targetContentDescriptions.add(contentDescription); } array.recycle(); return targetContentDescriptions; } public int getResourceIdForTarget(int index) { final TargetDrawable drawable = mTargetDrawables.get(index); return drawable == null ? 0 : drawable.getResourceId(); } public void setEnableTarget(int resourceId, boolean enabled) { for (int i = 0; i < mTargetDrawables.size(); i++) { final TargetDrawable target = mTargetDrawables.get(i); if (target.getResourceId() == resourceId) { target.setEnabled(enabled); break; // should never be more than one match } } } /** * Gets the position of a target in the array that matches the given resource. * @param resourceId * @return the index or -1 if not found */ public int getTargetPosition(int resourceId) { for (int i = 0; i < mTargetDrawables.size(); i++) { final TargetDrawable target = mTargetDrawables.get(i); if (target.getResourceId() == resourceId) { return i; // should never be more than one match } } return -1; } private boolean replaceTargetDrawables(Resources res, int existingResourceId, int newResourceId) { if (existingResourceId == 0 || newResourceId == 0) { return false; } boolean result = false; final ArrayList<TargetDrawable> drawables = mTargetDrawables; final int size = drawables.size(); for (int i = 0; i < size; i++) { final TargetDrawable target = drawables.get(i); if (target != null && target.getResourceId() == existingResourceId) { target.setDrawable(res, newResourceId); result = true; } } if (result) { requestLayout(); // in case any given drawable's size changes } return result; } /** * Searches the given package for a resource to use to replace the Drawable on the * target with the given resource id * @param component of the .apk that contains the resource * @param name of the metadata in the .apk * @param existingResId the resource id of the target to search for * @return true if found in the given package and replaced at least one target Drawables */ public boolean replaceTargetDrawablesIfPresent(ComponentName component, String name, int existingResId) { if (existingResId == 0) return false; boolean replaced = false; if (component != null) { try { PackageManager packageManager = getContext().getPackageManager(); // Look for the search icon specified in the activity meta-data Bundle metaData = packageManager.getActivityInfo(component, PackageManager.GET_META_DATA).metaData; if (metaData != null) { int iconResId = metaData.getInt(name); if (iconResId != 0) { Resources res = packageManager.getResourcesForActivity(component); replaced = replaceTargetDrawables(res, existingResId, iconResId); } } } catch (NameNotFoundException e) { Log.w(TAG, "Failed to swap drawable; " + component.flattenToShortString() + " not found", e); } catch (Resources.NotFoundException nfe) { Log.w(TAG, "Failed to swap drawable from " + component.flattenToShortString(), nfe); } } if (!replaced) { // Restore the original drawable replaceTargetDrawables(getContext().getResources(), existingResId, existingResId); } return replaced; } }