首先，我使用 Fragment Activity 创建了选项卡。当我点击第一个选项卡时，它应该显示谷歌地图当前位置。请帮助我获取此代码。我的主要活动如下
public class MainTabActivity extends FragmentActivity {
private FragmentTabHost mTabHost;
static String TAB_A = "First Tab";
static String TAB_B = "Second Tab";
static String TAB_C= "Third Tab";
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.bottom_tabs);
mTabHost = (FragmentTabHost) findViewById(android.R.id.tabhost);
mTabHost.setup(this, getSupportFragmentManager(), R.id.realtabcontent);
mTabHost.addTab(
mTabHost.newTabSpec("first").setIndicator(createTabView(TAB_A, R.drawable.ic_tab_dialer)),
MainActivity.class, null);
mTabHost.addTab(
mTabHost.newTabSpec("second").setIndicator(createTabView(TAB_A, R.drawable.ic_tab_dialer)),
Fragment1.class, null);
mTabHost.addTab(
mTabHost.newTabSpec("third").setIndicator(createTabView(TAB_A, R.drawable.ic_tab_dialer)),
Fragment1.class, null);
}
private View createTabView(final String text, final int id)
{
View view = LayoutInflater.from(this).inflate(R.layout.tabs_icon, null);
ImageView imageView = (ImageView) view.findViewById(R.id.tab_icon);
imageView.setImageDrawable(getResources().getDrawable(id));((TextView) view.findViewById(R.id.tab_text)).setText(text);
return view;
}
Map类如下
public class MainActivity extends FragmentActivity {
GoogleMap googleMap;
MarkerOptions markerOptions;
LatLng latLng;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SupportMapFragment supportMapFragment = (SupportMapFragment)
getSupportFragmentManager().findFragmentById(R.id.map);
// Getting a reference to the map
googleMap = supportMapFragment.getMap();
// Getting reference to btn_find of the layout activity_main
Button btn_find = (Button) findViewById(R.id.btn_find);
// Defining button click event listener for the find button
OnClickListener findClickListener = new OnClickListener() {
@Override
public void onClick(View v) {
// Getting reference to EditText to get the user input location
EditText etLocation = (EditText) findViewById(R.id.et_location);
// Getting user input location
String location = etLocation.getText().toString();
if(location!=null && !location.equals("")){
new GeocoderTask().execute(location);
}
}
};
// Setting button click event listener for the find button
btn_find.setOnClickListener(findClickListener);
}
// An AsyncTask class for accessing the GeoCoding Web Service
private class GeocoderTask extends AsyncTask<String, Void, List<Address>>{
@Override
protected List<Address> doInBackground(String... locationName) {
// Creating an instance of Geocoder class
Geocoder geocoder = new Geocoder(getBaseContext());
List<Address> addresses = null;
try {
// Getting a maximum of 3 Address that matches the input text
addresses = geocoder.getFromLocationName(locationName[0], 3);
} catch (IOException e) {
e.printStackTrace();
}
return addresses;
}
@Override
protected void onPostExecute(List<Address> addresses) {
if(addresses==null || addresses.size()==0){
Toast.makeText(getBaseContext(), "No Location found", Toast.LENGTH_SHORT).show();
}
// Clears all the existing markers on the map
googleMap.clear();
// Adding Markers on Google Map for each matching address
for(int i=0;i<addresses.size();i++){
Address address = (Address) addresses.get(i);
// Creating an instance of GeoPoint, to display in Google Map
latLng = new LatLng(address.getLatitude(), address.getLongitude());
String addressText = String.format("%s, %s",
address.getMaxAddressLineIndex() > 0 ? address.getAddressLine(0) : "",
address.getCountryName());
markerOptions = new MarkerOptions();
markerOptions.position(latLng);
markerOptions.title(addressText);
googleMap.addMarker(markerOptions);
// Locate the first location
if(i==0)
googleMap.animateCamera(CameraUpdateFactory.newLatLng(latLng));
}
}
}
我收到如下错误
10-30 06:44:20.128: E/Trace(4500): error opening trace file: No such file or directory (2)
10-30 06:44:20.908: D/AndroidRuntime(4500): Shutting down VM
10-30 06:44:20.908: W/dalvikvm(4500): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
10-30 06:44:20.928: E/AndroidRuntime(4500): FATAL EXCEPTION: main
10-30 06:44:20.928: E/AndroidRuntime(4500): java.lang.ClassCastException: com.example.mapexampleapp.MainActivity cannot be cast to android.support.v4.app.Fragment
10-30 06:44:20.928: E/AndroidRuntime(4500): at android.support.v4.app.Fragment.instantiate(Fragment.java:402)
10-30 06:44:20.928: E/AndroidRuntime(4500): at android.support.v4.app.FragmentTabHost.doTabChanged(FragmentTabHost.java:339)
10-30 06:44:20.928: E/AndroidRuntime(4500): at android.support.v4.app.FragmentTabHost.onAttachedToWindow(FragmentTabHost.java:276)
10-30 06:44:20.928: E/AndroidRuntime(4500): at android.view.View.dispatchAttachedToWindow(View.java:11937)
10-30 06:44:20.928: E/AndroidRuntime(4500): at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2415)
10-30 06:44:20.928: E/AndroidRuntime(4500): at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2422)
10-30 06:44:20.928: E/AndroidRuntime(4500): at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2422)
10-30 06:44:20.928: E/AndroidRuntime(4500): at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2422)
10-30 06:44:20.928: E/AndroidRuntime(4500): at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2422)
10-30 06:44:20.928: E/AndroidRuntime(4500): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1192)
10-30 06:44:20.928: E/AndroidRuntime(4500): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)
10-30 06:44:20.928: E/AndroidRuntime(4500): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)
10-30 06:44:20.928: E/AndroidRuntime(4500): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
10-30 06:44:20.928: E/AndroidRuntime(4500): at android.view.Choreographer.doCallbacks(Choreographer.java:562)
10-30 06:44:20.928: E/AndroidRuntime(4500): at android.view.Choreographer.doFrame(Choreographer.java:532)
10-30 06:44:20.928: E/AndroidRuntime(4500): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
10-30 06:44:20.928: E/AndroidRuntime(4500): at android.os.Handler.handleCallback(Handler.java:725)
10-30 06:44:20.928: E/AndroidRuntime(4500): at android.os.Handler.dispatchMessage(Handler.java:92)
10-30 06:44:20.928: E/AndroidRuntime(4500): at android.os.Looper.loop(Looper.java:137)
10-30 06:44:20.928: E/AndroidRuntime(4500): at android.app.ActivityThread.main(ActivityThread.java:5041)
10-30 06:44:20.928: E/AndroidRuntime(4500): at java.lang.reflect.Method.invokeNative(Native Method)
10-30 06:44:20.928: E/AndroidRuntime(4500): at java.lang.reflect.Method.invoke(Method.java:511)
10-30 06:44:20.928: E/AndroidRuntime(4500): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
10-30 06:44:20.928: E/AndroidRuntime(4500): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
10-30 06:44:20.928: E/AndroidRuntime(4500): at dalvik.system.NativeStart.main(Native Method)