/
ElevationOverlayDemoActivity.java
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/
ElevationOverlayDemoActivity.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.os.Bundle;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.core.view.ViewCompat;
import com.google.android.material.elevation.ElevationOverlayProvider;
import com.google.android.material.internal.ViewUtils;
import io.material.catalog.feature.DemoActivity;
import java.util.Locale;
/** A fragment that displays the Elevation Overlay demo for the Catalog app. */
public class ElevationOverlayDemoActivity extends DemoActivity {
@Override
public View onCreateDemoView(
LayoutInflater layoutInflater, @Nullable ViewGroup viewGroup, @Nullable Bundle bundle) {
View view =
layoutInflater.inflate(
R.layout.cat_elevation_overlay_activity, viewGroup, /* attachToRoot= */ false);
RecyclerView recyclerView = view.findViewById(R.id.recycler_view);
recyclerView.setAdapter(new Adapter(getElevationDpValues()));
recyclerView.setLayoutManager(
new LinearLayoutManager(this, RecyclerView.VERTICAL, /* reverseLayout= */ false));
return view;
}
@Override
public int getDemoTitleResId() {
return R.string.cat_elevation_overlay_title;
}
protected int[] getElevationDpValues() {
return new int[] {1, 2, 3, 4, 6, 8, 12, 16, 24};
}
private class Adapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private final int[] elevationDpValues;
public Adapter(int[] elevationDpValues) {
this.elevationDpValues = elevationDpValues;
}
@NonNull
@Override
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
View view =
inflater.inflate(R.layout.cat_elevation_overlay_item, parent, /* attachToRoot= */ false);
return new ItemViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder viewHolder, int position) {
((ItemViewHolder) viewHolder).bind(elevationDpValues[position]);
}
@Override
public int getItemCount() {
return elevationDpValues.length;
}
private class ItemViewHolder extends RecyclerView.ViewHolder {
private final ElevationOverlayProvider overlayProvider;
private final TextView dpLabelView;
private final TextView alphaLabelView;
private ItemViewHolder(View itemView) {
super(itemView);
overlayProvider = new ElevationOverlayProvider(itemView.getContext());
dpLabelView = itemView.findViewById(R.id.elevation_overlay_dp_label);
alphaLabelView = itemView.findViewById(R.id.elevation_overlay_alpha_label);
}
@SuppressWarnings("RestrictTo")
private void bind(int elevationDp) {
float elevation = ViewUtils.dpToPx(ElevationOverlayDemoActivity.this, elevationDp);
int color = overlayProvider.compositeOverlayWithThemeSurfaceColorIfNeeded(elevation);
int alphaPercent =
Math.round(overlayProvider.calculateOverlayAlphaFraction(elevation) * 100);
ViewCompat.setElevation(itemView, elevation);
itemView.setBackgroundColor(color);
dpLabelView.setText(String.format(Locale.getDefault(), "%02d dp", elevationDp));
alphaLabelView.setText(String.format(Locale.getDefault(), "%d%% On Surface", alphaPercent));
}
}
}
}