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feat: Adding SnapshotDemoActivity. (#433)
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‎ApiDemos/kotlin/app/src/gms/AndroidManifest.xml‎

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<activity android:name=".RawMapViewDemoActivity" />
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<activity android:name=".RetainMapDemoActivity" />
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<activity android:name=".SaveStateDemoActivity" />
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<activity android:name=".SnapshotDemoActivity" />
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<activity android:name=".SplitStreetViewPanoramaAndMapDemoActivity" />
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<activity android:name=".StreetViewPanoramaBasicDemoActivity" />
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<activity android:name=".StreetViewPanoramaEventsDemoActivity" />

‎ApiDemos/kotlin/app/src/gms/java/com/example/kotlindemos/DemoDetailsList.kt‎

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DemoDetails(R.string.save_state_demo_label,
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R.string.save_state_demo_description,
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SaveStateDemoActivity::class.java),
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DemoDetails(R.string.snapshot_demo_label,
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R.string.snapshot_demo_description,
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SnapshotDemoActivity::class.java),
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DemoDetails(R.string.street_view_panorama_basic_demo_label,
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R.string.street_view_panorama_basic_demo_details,
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StreetViewPanoramaBasicDemoActivity::class.java),

‎ApiDemos/kotlin/app/src/gms/java/com/example/kotlindemos/SnapshotDemoActivity.kt‎

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// Copyright 2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package com.example.kotlindemos
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import android.os.Bundle
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import android.view.View
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import android.widget.Button
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import android.widget.CheckBox
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import android.widget.ImageView
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import androidx.appcompat.app.AppCompatActivity
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import androidx.lifecycle.lifecycleScope
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import com.google.android.gms.maps.GoogleMap
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import com.google.android.gms.maps.GoogleMap.SnapshotReadyCallback
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import com.google.android.gms.maps.SupportMapFragment
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import com.google.maps.android.ktx.awaitMap
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/**
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* This shows how to take a snapshot of the map.
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*/
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class SnapshotDemoActivity : AppCompatActivity() {
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/**
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* Note that this may be null if the Google Play services APK is not available.
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*/
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private lateinit var map: GoogleMap
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private lateinit var waitForMapLoadCheckBox: CheckBox
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private lateinit var snapshotHolder: ImageView
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override fun onCreate(savedInstanceState: Bundle?) {
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super.onCreate(savedInstanceState)
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setContentView(R.layout.snapshot_demo)
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waitForMapLoadCheckBox = findViewById(R.id.wait_for_map_load)
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snapshotHolder = findViewById(R.id.snapshot_holder)
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val mapFragment = supportFragmentManager.findFragmentById(R.id.map) as SupportMapFragment
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lifecycleScope.launchWhenCreated {
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map = mapFragment.awaitMap()
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attachButtonListeners()
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}
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}
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private fun attachButtonListeners() {
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findViewById<Button>(R.id.button_take_snapshot).setOnClickListener {
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takeSnapshot()
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}
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findViewById<Button>(R.id.button_clear_snapshot).setOnClickListener {
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clearSnapshot()
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}
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}
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private fun takeSnapshot() {
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val callback =
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SnapshotReadyCallback { snapshot -> // Callback is called from the main thread, so we can modify the ImageView safely.
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snapshotHolder.setImageBitmap(snapshot)
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}
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if (waitForMapLoadCheckBox.isChecked) {
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map.setOnMapLoadedCallback { map.snapshot(callback) }
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} else {
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map.snapshot(callback)
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}
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}
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/**
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* Called when the clear button is clicked.
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*/
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private fun clearSnapshot() {
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snapshotHolder.setImageDrawable(null)
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}
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}

‎ApiDemos/kotlin/app/src/gms/res/layout-land/snapshot_demo.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<!--
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Copyright 2020 Google LLC
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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android:orientation="vertical">
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<LinearLayout
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android:layout_width="match_parent"
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android:layout_height="0dp"
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android:layout_weight="1"
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android:orientation="horizontal">
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<fragment
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android:id="@+id/map"
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android:layout_width="0dp"
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android:layout_weight="1"
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android:layout_height="match_parent"
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class="com.google.android.gms.maps.SupportMapFragment" />
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<ImageView
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android:id="@+id/snapshot_holder"
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android:layout_width="0dp"
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android:layout_weight="1"
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android:layout_height="match_parent"
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android:contentDescription="@string/snapshot_holder_description" />
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</LinearLayout>
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<CheckBox
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android:id="@+id/wait_for_map_load"
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android:layout_width="match_parent"
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android:layout_height="wrap_content"
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android:checked="true"
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android:text="@string/wait_for_map_load" />
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<LinearLayout
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:orientation="horizontal">
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<Button
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android:id="@+id/button_take_snapshot"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="@string/snapshot_take_button" />
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<Button
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android:id="@+id/button_clear_snapshot"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="@string/snapshot_clear_button" />
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</LinearLayout>
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</LinearLayout>

‎ApiDemos/kotlin/app/src/gms/res/layout/snapshot_demo.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<!--
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Copyright (C) 2012 The Android Open Source Project
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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android:orientation="vertical">
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<LinearLayout
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android:layout_width="match_parent"
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android:layout_height="0dp"
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android:layout_weight="1"
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android:orientation="vertical">
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<fragment
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android:id="@+id/map"
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android:layout_width="match_parent"
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android:layout_weight="1"
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android:layout_height="0dp"
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class="com.google.android.gms.maps.SupportMapFragment" />
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<ImageView
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android:id="@+id/snapshot_holder"
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android:layout_width="match_parent"
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android:layout_weight="1"
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android:layout_height="0dp"
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android:contentDescription="@string/snapshot_holder_description" />
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</LinearLayout>
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<CheckBox
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android:id="@+id/wait_for_map_load"
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android:layout_width="match_parent"
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android:layout_height="wrap_content"
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android:checked="true"
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android:text="@string/wait_for_map_load" />
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<LinearLayout
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:orientation="horizontal">
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<Button
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android:id="@+id/button_take_snapshot"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="@string/snapshot_take_button" />
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<Button
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android:id="@+id/button_clear_snapshot"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="@string/snapshot_clear_button" />
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</LinearLayout>
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</LinearLayout>

‎ApiDemos/kotlin/app/src/main/res/values/strings.xml‎

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<string name="save_state_demo_description">Demonstrates how to save the state of a MapFragment upon rotation of the device.</string>
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<string name="save_state_instructions">Drag the marker, tap on it to change its color and rotate the device to check that the state of the map is preserved.</string>
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<!-- Snapshot -->
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<string name="snapshot_clear_button">Clear</string>
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<string name="snapshot_demo_label">Snapshot</string>
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<string name="snapshot_demo_description">Demonstrates how to take a snapshot of the map.</string>
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<string name="snapshot_holder_description">Area for the map snapshot.</string>
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<string name="snapshot_take_button">Take snapshot</string>
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<string name="wait_for_map_load">Wait for Map Load</string>
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</resources>

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