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ElevationAnimationDemoFragment.java
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ElevationAnimationDemoFragment.java
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/*
* Copyright 2019 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 io.material.catalog.elevation;
import io.material.catalog.R;
import android.animation.ValueAnimator;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.annotation.Nullable;
import androidx.core.view.ViewCompat;
import com.google.android.material.shape.MaterialShapeDrawable;
import io.material.catalog.feature.DemoFragment;
/** A fragment that displays the Elevation animation demo for the Catalog app. */
public class ElevationAnimationDemoFragment extends DemoFragment {
private static final long ANIMATION_DURATION_MILLIS = 2000;
private static final long ANIMATION_START_DELAY_MILLIS = 1000;
@Override
public View onCreateDemoView(
LayoutInflater layoutInflater, @Nullable ViewGroup viewGroup, @Nullable Bundle bundle) {
View view =
layoutInflater.inflate(
R.layout.cat_elevation_animation_fragment, viewGroup, false /* attachToRoot */);
TextView translationZLabelView = view.findViewById(R.id.translation_z_label);
float maxTranslationZ = getResources().getDimension(R.dimen.cat_elevation_max_translation_z);
int maxTranslationZDp = (int) (maxTranslationZ / getResources().getDisplayMetrics().density);
translationZLabelView.setText(
getString(R.string.cat_elevation_animation_label, maxTranslationZDp));
MaterialShapeDrawable materialShapeDrawable =
MaterialShapeDrawable.createWithElevationOverlay(view.getContext());
ViewCompat.setBackground(view, materialShapeDrawable);
setTranslationZ(view, materialShapeDrawable, maxTranslationZ);
startTranslationZAnimation(view, materialShapeDrawable, maxTranslationZ);
return view;
}
private void startTranslationZAnimation(
View view, MaterialShapeDrawable materialShapeDrawable, float maxTranslationZ) {
ValueAnimator animator = ValueAnimator.ofFloat(0, maxTranslationZ);
animator.setDuration(ANIMATION_DURATION_MILLIS);
animator.setStartDelay(ANIMATION_START_DELAY_MILLIS);
animator.setRepeatMode(ValueAnimator.RESTART);
animator.setRepeatCount(ValueAnimator.INFINITE);
animator.addUpdateListener(
animation ->
setTranslationZ(view, materialShapeDrawable, (float) animation.getAnimatedValue()));
animator.start();
}
private void setTranslationZ(
View view, MaterialShapeDrawable materialShapeDrawable, float translationZ) {
materialShapeDrawable.setTranslationZ(translationZ);
ViewCompat.setTranslationZ(view, translationZ);
}
}