下列程式碼範例說明如何呼叫 addPolygon 方法，在 3D 空間中新增 3D 多邊形並放置。如要使用這個程式碼範例，請按照「設定」和「在應用程式中加入 3D 地圖」中的操作說明，在 Android Studio 專案中設定基本 3D 地圖。接著，將下列程式碼新增至 MainActivity.kt 檔案：
// Add imports and define variables
import com.google.android.gms.maps3d.model.LatLngAltitude
import com.google.android.gms.maps3d.model.polygonOptions
val zooOutline = """
39.7508987, -104.9565381
39.7502883, -104.9565489
39.7501976, -104.9563557
39.7501481, -104.955594
39.7499171, -104.9553043
39.7495872, -104.9551648
39.7492407, -104.954961
39.7489685, -104.9548859
39.7484488, -104.9548966
39.7481189, -104.9548859
39.7479539, -104.9547679
39.7479209, -104.9544567
39.7476487, -104.9535341
39.7475085, -104.9525792
39.7474095, -104.9519247
39.747525, -104.9513776
39.7476734, -104.9511844
39.7478137, -104.9506265
39.7477559, -104.9496395
39.7477477, -104.9486203
39.7478467, -104.9475796
39.7482344, -104.9465818
39.7486138, -104.9457878
39.7491005, -104.9454874
39.7495789, -104.945938
39.7500491, -104.9466998
39.7503213, -104.9474615
39.7505358, -104.9486954
39.7505111, -104.950648
39.7511215, -104.9506587
39.7511173, -104.9527187
39.7511091, -104.9546445
39.7508987, -104.9565381""".trimIndent()
.split("\n")
.map { line -> line.split(",").map { it.trim().toDouble() } }
.map { coords ->
latLngAltitude {
latitude = coords[0]
longitude = coords[1]
altitude = 0.0
}
}
val zooPolygonOptions = polygonOptions {
outerCoordinates = zooOutline
fillColor = Color.argb(70, 255, 255, 0)
strokeColor = Color.GREEN
strokeWidth = 3.0
altitudeMode = AltitudeMode.CLAMP_TO_GROUND
}
val zooPolygon = googleMap3D.addPolygon(zooPolygonOptions)
...
// Add to the onMap3DViewReady method, after the googleMap3D object has been initialized
googleMap3D.setCamera(
camera {
center = latLngAltitude {
latitude = 39.748477
longitude = -104.947575
altitude = 1610.0
}
heading = 290.0
tilt = 47.0
range = 2251.0
}
)
監聽多邊形點擊事件
如要監聽多邊形的點擊事件，請在多邊形物件上呼叫 setClickListener。以下範例說明如何在多邊形上設定點擊事件監聽器：
polygon.setClickListener {
lifecycleScope.launch(Dispatchers.Main) {
Toast.makeText(this@PolygonsActivity, "Check out the Museum!", Toast.LENGTH_SHORT).show()
}
}
請注意，點擊處理常式不會在主 (或 UI) 執行緒上執行。如要變更 UI (例如顯示 Toast 訊息)，請務必切換至 Main 執行緒。如果是 Kotlin，您可以使用 lifecycleScope.launch(Dispatchers.Main) 達成此效果。