是否可以将内容加载到一项活动的不同选项卡中？
我见过很多例子，其他用户只是在单独的文件中加载活动。我已经尝试过这种方法，但对我不起作用......
我正在尝试制作一个位置跟踪应用程序。我设法让地图显示在一个选项卡中，但我尝试在另一个选项卡中加载其他内容，但无法正常工作。我的应用程序崩溃了。
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
initMapView();
initMyLocation();
TabHost.TabSpec spec;
TabHost th = (TabHost)findViewById(R.id.tabhost);
th.setup();
spec = th.newTabSpec("tag1");
spec.setContent(R.id.mapTab);
spec.setIndicator("Map");
th.addTab(spec);
spec = th.newTabSpec("tag2");
spec.setContent(R.id.logTab);
spec.setIndicator("Log");
th.addTab(spec);
spec = th.newTabSpec("tag3");
spec.setContent(R.id.detailsTab);
spec.setIndicator("Details");
th.addTab(spec);
}
@Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
//Zoom In/Out Controls
private void initMapView() {
map = (MapView) findViewById(R.id.mvMain);
controller = map.getController();
map.setSatellite(true);
//map.setStreetView(true);
map.setBuiltInZoomControls(true);
}
//Creates an Overlay that marks current position
private void initMyLocation() {
final MyLocationOverlay overlay = new MyLocationOverlay(this, map);
overlay.enableMyLocation();
overlay.enableCompass();
overlay.runOnFirstFix(new Runnable() {
public void run() {
controller.setZoom(17);
controller.animateTo(overlay.getMyLocation());
map.getOverlays().add(overlay);
}
});
}
//Experiment
public class detailsTab extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.id.detailsTab);
LocationManager locationManager;
String context = Context.LOCATION_SERVICE;
locationManager = (LocationManager)getSystemService(context);
String provider = LocationManager.GPS_PROVIDER;
Location location = locationManager.getLastKnownLocation(provider);
updateWithNewLocation(location);
}
private void updateWithNewLocation(Location location) {
String latLongString;
TextView myLocationText;
myLocationText = (TextView)findViewById(R.id.detailsText);
if(location != null){
double lat = location.getLatitude();
double lng = location.getLongitude();
latLongString = "Lat:" + lat + "\nLong" + lng;
}
else {
latLongString = "No Location Found";
}
myLocationText.setText("Your current position is: \n" + latLongString);
}
}
public class NewOverlay extends Overlay {
@Override
public void draw(Canvas canvas, MapView mapView, boolean shadow) {
Projection projection = mapView.getProjection();
Double lat = lati *1E6;
Double lng = longi *1E6;
GeoPoint geoPoint = new GeoPoint(lat.intValue(), lng.intValue());
if (shadow == false) {
Point myPoint = new Point();
projection.toPixels(geoPoint, myPoint);
//Creating and setting up the paint brush
Paint paint = new Paint();
paint.setARGB(250, 255, 0, 0);
paint.setAntiAlias(true);
paint.setFakeBoldText(true);
//Create circle
int rad = 25;
RectF oval = new RectF(myPoint.x-rad, myPoint.y-rad, myPoint.x+rad, myPoint.y+rad);
canvas.drawOval(oval, paint);
canvas.drawText("Red Circle", myPoint.x+rad, myPoint.y, paint);
}
}
}
}