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@AlexMeuer
Created February 7, 2018 11:15
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Utility class for performing common color animations on Views. (Use of `MoreObjects` can be replaced with a turnary if you really hate Guava.)
package foo.bar.baz;
import android.animation.ArgbEvaluator;
import android.animation.ObjectAnimator;
import android.animation.TimeInterpolator;
import android.animation.ValueAnimator;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.support.annotation.ColorInt;
import android.support.annotation.FloatRange;
import android.support.annotation.NonNull;
import android.view.View;
import android.view.ViewPropertyAnimator;
import android.widget.ImageView;
import android.widget.TextView;
import com.google.common.base.MoreObjects;
public final class ViewUtil {
private static ColorMatrixColorFilter greyscaleFilter;
private ViewUtil() { /* Instantiation is not allowed. */ }
/**
* Changes the transparency of a view over time.
* If setting to min opacity, sets visibility to GONE at the end, otherwise sets visibility to
* VISIBLE at the start.
* @param view The view to animate.
* @param alpha The new alpha value.
* @return The animation that was created.
*/
@NonNull
public static ViewPropertyAnimator animateAlpha(@NonNull final View view, @FloatRange(from=0.0f, to=1.0f) float alpha,
long duration, @NonNull TimeInterpolator interpolator) {
final ViewPropertyAnimator animator = view.animate()
.alpha(alpha)
.setDuration(duration)
.setInterpolator(interpolator);
if (alpha <= 0.f) {
animator.withEndAction(new Runnable() {
@Override public void run() {
view.setVisibility(View.GONE);
}
});
} else {
animator.withStartAction(new Runnable() {
@Override public void run() {
view.setVisibility(View.VISIBLE);
}
});
}
return animator;
}
public static void animateTextViewColor(@NonNull TextView view, @ColorInt int newColor,
long duration, @NonNull TimeInterpolator interpolator) {
final @ColorInt int oldColor = view.getCurrentTextColor();
final ObjectAnimator animator = ObjectAnimator.ofInt(view, "textColor",
oldColor, newColor);
animator.setEvaluator(new ArgbEvaluator());
animator.setDuration(duration);
animator.setInterpolator(interpolator);
animator.start();
}
public static void animateImageViewColor(@NonNull final ImageView view, @ColorInt int newColor,
long duration, @NonNull TimeInterpolator interpolator) {
final ValueAnimator animator = ValueAnimator.ofObject(
new ArgbEvaluator(),
MoreObjects.firstNonNull(view.getTag(), 0xFFFFFFFF), // Default to white if no tag set
newColor
);
animator.setDuration(duration);
animator.setInterpolator(interpolator);
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
final int newColor = (int) animation.getAnimatedValue();
view.setColorFilter(newColor);
view.setTag(newColor);
}
});
animator.start();
}
public static synchronized ColorMatrixColorFilter getGrayscaleColorFilter() {
if (null == greyscaleFilter) {
final ColorMatrix matrix = new ColorMatrix();
matrix.setSaturation(0);
greyscaleFilter = new ColorMatrixColorFilter(matrix);
}
return greyscaleFilter;
}
/**
* Disables an image view and applies a monochrome color filter to it.
* @param view The view to disable.
*/
public static void disableAndGrayOut(@NonNull ImageView view) {
view.setEnabled(false);
view.setColorFilter(ViewUtil.getGrayscaleColorFilter());
}
/**
* Enables an image view and clears any color filter applied to it.
* @param view The view to enable.
*/
public static void enableAndClearFilter(@NonNull ImageView view) {
view.setEnabled(true);
view.clearColorFilter();
}
public static void setGrayAndDisable(@NonNull ImageView view, boolean disabled) {
if (disabled) {
disableAndGrayOut(view);
} else {
enableAndClearFilter(view);
}
}
}
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