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/*
* Copyright (C) 2015 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.android.settings.fingerprint;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ValueAnimator;
import android.annotation.Nullable;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.View;
import android.view.animation.AnimationUtils;
import android.view.animation.Interpolator;
import com.android.settings.R;
/**
* View which plays an animation to indicate where the sensor is on the device.
*/
public class FingerprintLocationAnimationView extends View {
private static final float MAX_PULSE_ALPHA = 0.15f;
private static final long DELAY_BETWEEN_PHASE = 1000;
private final Interpolator mLinearOutSlowInInterpolator;
private final Interpolator mFastOutSlowInInterpolator;
private final int mDotRadius;
private final int mMaxPulseRadius;
private final float mFractionCenterX;
private final float mFractionCenterY;
private final Paint mDotPaint = new Paint();
private final Paint mPulsePaint = new Paint();
private float mPulseRadius;
private ValueAnimator mRadiusAnimator;
private ValueAnimator mAlphaAnimator;
public FingerprintLocationAnimationView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
mDotRadius = getResources().getDimensionPixelSize(R.dimen.fingerprint_dot_radius);
mMaxPulseRadius = getResources().getDimensionPixelSize(R.dimen.fingerprint_pulse_radius);
mFractionCenterX = getResources().getFraction(
R.fraction.fingerprint_sensor_location_fraction_x, 1, 1);
mFractionCenterY = getResources().getFraction(
R.fraction.fingerprint_sensor_location_fraction_y, 1, 1);
TypedValue typedValue = new TypedValue();
context.getTheme().resolveAttribute(android.R.attr.colorAccent, typedValue, true);
int color = getResources().getColor(typedValue.resourceId, null);
mDotPaint.setAntiAlias(true);
mPulsePaint.setAntiAlias(true);
mDotPaint.setColor(color);
mPulsePaint.setColor(color);
mLinearOutSlowInInterpolator = AnimationUtils.loadInterpolator(context,
android.R.interpolator.linear_out_slow_in);
mFastOutSlowInInterpolator = AnimationUtils.loadInterpolator(context,
android.R.interpolator.linear_out_slow_in);
}
@Override
protected void onDraw(Canvas canvas) {
drawPulse(canvas);
drawDot(canvas);
}
private void drawDot(Canvas canvas) {
canvas.drawCircle(getCenterX(), getCenterY(), mDotRadius, mDotPaint);
}
private void drawPulse(Canvas canvas) {
canvas.drawCircle(getCenterX(), getCenterY(), mPulseRadius, mPulsePaint);
}
private float getCenterX() {
return getWidth() * mFractionCenterX;
}
private float getCenterY() {
return getHeight() * mFractionCenterY;
}
public void startAnimation() {
startPhase();
}
public void stopAnimation() {
removeCallbacks(mStartPhaseRunnable);
if (mRadiusAnimator != null) {
mRadiusAnimator.cancel();
}
if (mAlphaAnimator != null) {
mAlphaAnimator.cancel();
}
}
private void startPhase() {
startRadiusAnimation();
startAlphaAnimation();
}
private void startRadiusAnimation() {
ValueAnimator animator = ValueAnimator.ofFloat(0, mMaxPulseRadius);
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
mPulseRadius = (float) animation.getAnimatedValue();
invalidate();
}
});
animator.addListener(new AnimatorListenerAdapter() {
boolean mCancelled;
@Override
public void onAnimationCancel(Animator animation) {
mCancelled = true;
}
@Override
public void onAnimationEnd(Animator animation) {
mRadiusAnimator = null;
if (!mCancelled) {
postDelayed(mStartPhaseRunnable, DELAY_BETWEEN_PHASE);
}
}
});
animator.setDuration(1000);
animator.setInterpolator(mLinearOutSlowInInterpolator);
animator.start();
mRadiusAnimator = animator;
}
private void startAlphaAnimation() {
mPulsePaint.setAlpha((int) (255f * MAX_PULSE_ALPHA));
ValueAnimator animator = ValueAnimator.ofFloat(MAX_PULSE_ALPHA, 0f);
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
mPulsePaint.setAlpha((int) (255f * (float) animation.getAnimatedValue()));
invalidate();
}
});
animator.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
mAlphaAnimator = null;
}
});
animator.setDuration(750);
animator.setInterpolator(mFastOutSlowInInterpolator);
animator.setStartDelay(250);
animator.start();
mAlphaAnimator = animator;
}
private final Runnable mStartPhaseRunnable = new Runnable() {
@Override
public void run() {
startPhase();
}
};
}
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