如何将指南针添加到地图视图
创建地图视图时如何让指南针显示在屏幕上。这段代码有什么问题？有什么建议吗？
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.map);
mapView = (MapView) findViewById(R.id.mapview);
mapView.setBuiltInZoomControls(true);
mc = mapView.getController();
myLoc = new MyLocationOverlay(this, mapView);
myLoc.enableCompass();
mapView.getOverlays().add(myLoc);
mapView.postInvalidate();
locManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
How do I get the compass to be shown on the screen when my mapview is created. What is wrong with this code? any suggestions?
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.map);
mapView = (MapView) findViewById(R.id.mapview);
mapView.setBuiltInZoomControls(true);
mc = mapView.getController();
myLoc = new MyLocationOverlay(this, mapView);
myLoc.enableCompass();
mapView.getOverlays().add(myLoc);
mapView.postInvalidate();
locManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
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评论（1）
好吧，我不会在
onCreate()上调用enableCompass()（鉴于 <code>setContentView()，我假设此代码来自于此） > 呼叫）。在onResume()中启用指南针，并在onPause()中禁用它，这样当您的活动不在屏幕上时，您就不会保持传感器处于活动状态。而且您不应该需要postInvalidate()。否则，这看起来不错。请记住，它仅适用于实际硬件。
这是一个在
上启用指南针的示例项目MyLocationOverlay 绝对有效，尽管您需要替换为您自己的 android:apiKey 值。Well, I wouldn't call
enableCompass()ononCreate()(which is where I assume this code comes from, given thesetContentView()call). Enable the compass inonResume()and disable it inonPause(), so you don't keep the sensors alive when your activity is not on-screen. And you should not needpostInvalidate().Otherwise, this seems fine. Bear in mind that it will only work on actual hardware.
Here is a sample project that enables the compass on
MyLocationOverlaythat definitely works, though you will need to substitute in your ownandroid:apiKeyvalue.