prebuilts/gradle/GridViewPager/Wearable/src/main/java/com/example/android/wearable/gridviewpager/MainActivity.java

/*
 * Copyright (C) 2014 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.example.android.wearable.gridviewpager;

import android.app.Activity;
import android.content.res.Resources;
import android.os.Bundle;
import android.support.wearable.view.GridViewPager;
import android.view.View;
import android.view.View.OnApplyWindowInsetsListener;
import android.view.WindowInsets;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final Resources res = getResources();
        final GridViewPager pager = (GridViewPager) findViewById(R.id.pager);
        pager.setOnApplyWindowInsetsListener(new OnApplyWindowInsetsListener() {
            @Override
            public WindowInsets onApplyWindowInsets(View v, WindowInsets insets) {
                // Adjust page margins:
                //   A little extra horizontal spacing between pages looks a bit
                //   less crowded on a round display.
                final boolean round = insets.isRound();
                int rowMargin = res.getDimensionPixelOffset(R.dimen.page_row_margin);
                int colMargin = res.getDimensionPixelOffset(round ?
                        R.dimen.page_column_margin_round : R.dimen.page_column_margin);
                pager.setPageMargins(rowMargin, colMargin);

                // GridViewPager relies on insets to properly handle
                // layout for round displays. They must be explicitly
                // applied since this listener has taken them over.
                pager.onApplyWindowInsets(insets);
                return insets;
            }
        });
        pager.setAdapter(new SampleGridPagerAdapter(this, getFragmentManager()));
    }
}