我是Android编程和谷歌地图v2的新手。我正在尝试使用谷歌地图v2在我的Android应用程序中绘制路线。问题是，每当我运行代码时，它都会给出膨胀异常。我无法弄清楚导致这个问题的原因。我关注这个网站 http://wptrafficanalyzer.in/blog/gps-and-google-map-in-android-applications-series/。 以下是我的代码：
public class MainActivity extends FragmentActivity implements LocationListener {
GoogleMap mGoogleMap;
ArrayList<LatLng> mMarkerPoints;
double mLatitude=0;
double mLongitude=0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Getting Google Play availability status
int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getBaseContext());
if(status!=ConnectionResult.SUCCESS){ // Google Play Services are not available
int requestCode = 10;
Dialog dialog = GooglePlayServicesUtil.getErrorDialog(status, this, requestCode);
dialog.show();
}else { // Google Play Services are available
// Initializing
mMarkerPoints = new ArrayList<LatLng>();
// Getting reference to SupportMapFragment of the activity_main
SupportMapFragment fm = (SupportMapFragment)getSupportFragmentManager().findFragmentById(R.id.map);
// Getting Map for the SupportMapFragment
mGoogleMap = fm.getMap();
// Enable MyLocation Button in the Map
mGoogleMap.setMyLocationEnabled(true);
// Getting LocationManager object from System Service LOCATION_SERVICE
LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
// Creating a criteria object to retrieve provider
Criteria criteria = new Criteria();
// Getting the name of the best provider
String provider = locationManager.getBestProvider(criteria, true);
// Getting Current Location From GPS
Location location = locationManager.getLastKnownLocation(provider);
if(location!=null){
onLocationChanged(location);
}
locationManager.requestLocationUpdates(provider, 20000, 0, this);
// Setting onclick event listener for the map
mGoogleMap.setOnMapClickListener(new OnMapClickListener() {
@Override
public void onMapClick(LatLng point) {
// Already map contain destination location
if(mMarkerPoints.size()>1){
FragmentManager fm = getSupportFragmentManager();
mMarkerPoints.clear();
mGoogleMap.clear();
LatLng startPoint = new LatLng(mLatitude, mLongitude);
drawMarker(startPoint);
}
drawMarker(point);
// Checks, whether start and end locations are captured
if(mMarkerPoints.size() >= 2){
LatLng origin = mMarkerPoints.get(0);
LatLng dest = mMarkerPoints.get(1);
// Getting URL to the Google Directions API
String url = getDirectionsUrl(origin, dest);
DownloadTask downloadTask = new DownloadTask();
// Start downloading json data from Google Directions API
downloadTask.execute(url);
}
}
});
}
}
private String getDirectionsUrl(LatLng origin,LatLng dest){
// Origin of route
String str_origin = "origin="+origin.latitude+","+origin.longitude;
// Destination of route
String str_dest = "destination="+dest.latitude+","+dest.longitude;
// Sensor enabled
String sensor = "sensor=false";
// Building the parameters to the web service
String parameters = str_origin+"&"+str_dest+"&"+sensor;
// Output format
String output = "json";
// Building the url to the web service
String url = "https://maps.googleapis.com/maps/api/directions/"+output+"?"+parameters;
return url;
}
/** A method to download json data from url */
private String downloadUrl(String strUrl) throws IOException{
String data = "";
InputStream iStream = null;
HttpURLConnection urlConnection = null;
try{
URL url = new URL(strUrl);
// Creating an http connection to communicate with url
urlConnection = (HttpURLConnection) url.openConnection();
// Connecting to url
urlConnection.connect();
// Reading data from url
iStream = urlConnection.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(iStream));
StringBuffer sb = new StringBuffer();
String line = "";
while( ( line = br.readLine()) != null){
sb.append(line);
}
data = sb.toString();
br.close();
}catch(Exception e){
Log.d("Exception while downloading url", e.toString());
}finally{
iStream.close();
urlConnection.disconnect();
}
return data;
}
/** A class to download data from Google Directions URL */
private class DownloadTask extends AsyncTask<String, Void, String>{
// Downloading data in non-ui thread
@Override
protected String doInBackground(String... url) {
// For storing data from web service
String data = "";
try{
// Fetching the data from web service
data = downloadUrl(url[0]);
}catch(Exception e){
Log.d("Background Task",e.toString());
}
return data;
}
// Executes in UI thread, after the execution of
// doInBackground()
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
ParserTask parserTask = new ParserTask();
// Invokes the thread for parsing the JSON data
parserTask.execute(result);
}
}
/** A class to parse the Google Directions in JSON format */
private class ParserTask extends AsyncTask<String, Integer, List<List<HashMap<String,String>>> >{
// Parsing the data in non-ui thread
@Override
protected List<List<HashMap<String, String>>> doInBackground(String... jsonData) {
JSONObject jObject;
List<List<HashMap<String, String>>> routes = null;
try{
jObject = new JSONObject(jsonData[0]);
DirectionsJSONParser parser = new DirectionsJSONParser();
// Starts parsing data
routes = parser.parse(jObject);
}catch(Exception e){
e.printStackTrace();
}
return routes;
}
// Executes in UI thread, after the parsing process
@Override
protected void onPostExecute(List<List<HashMap<String, String>>> result) {
ArrayList<LatLng> points = null;
PolylineOptions lineOptions = null;
// Traversing through all the routes
for(int i=0;i<result.size();i++){
points = new ArrayList<LatLng>();
lineOptions = new PolylineOptions();
// Fetching i-th route
List<HashMap<String, String>> path = result.get(i);
// Fetching all the points in i-th route
for(int j=0;j<path.size();j++){
HashMap<String,String> point = path.get(j);
double lat = Double.parseDouble(point.get("lat"));
double lng = Double.parseDouble(point.get("lng"));
LatLng position = new LatLng(lat, lng);
points.add(position);
}
// Adding all the points in the route to LineOptions
lineOptions.addAll(points);
lineOptions.width(2);
lineOptions.color(Color.RED);
}
// Drawing polyline in the Google Map for the i-th route
mGoogleMap.addPolyline(lineOptions);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
private void drawMarker(LatLng point){
mMarkerPoints.add(point);
// Creating MarkerOptions
MarkerOptions options = new MarkerOptions();
// Setting the position of the marker
options.position(point);
/**
* For the start location, the color of marker is GREEN and
* for the end location, the color of marker is RED.
*/
if(mMarkerPoints.size()==1){
options.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN));
}else if(mMarkerPoints.size()==2){
options.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED));
}
// Add new marker to the Google Map Android API V2
mGoogleMap.addMarker(options);
}
@Override
public void onLocationChanged(Location location) {
// Draw the marker, if destination location is not set
if(mMarkerPoints.size() < 2){
mLatitude = location.getLatitude();
mLongitude = location.getLongitude();
LatLng point = new LatLng(mLatitude, mLongitude);
mGoogleMap.moveCamera(CameraUpdateFactory.newLatLng(point));
mGoogleMap.animateCamera(CameraUpdateFactory.zoomTo(12));
drawMarker(point);
}
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
}
以下是我的xml文件：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<fragment
android:id="@+id/map"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
class="com.google.android.gms.maps.SupportMapFragment" />
</RelativeLayout>
LOGCAT错误：
10-21 11:14:31.220: I/ActivityThread(2739): Switching default density from 160 to 120
10-21 11:14:31.640: D/AndroidRuntime(2739): Shutting down VM
10-21 11:14:31.650: W/dalvikvm(2739): threadid=1: thread exiting with uncaught exception (group=0x9ceab648)
10-21 11:14:31.660: E/AndroidRuntime(2739): FATAL EXCEPTION: main
10-21 11:14:31.660: E/AndroidRuntime(2739): java.lang.RuntimeException: Unable to start activity ComponentInfo{in.wptrafficanalyzer.locationroutemylocationv2/in.wptrafficanalyzer.locationroutemylocationv2.MainActivity}: android.view.InflateException: Binary XML file line #7: Error inflating class fragment
10-21 11:14:31.660: E/AndroidRuntime(2739): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
10-21 11:14:31.660: E/AndroidRuntime(2739): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
10-21 11:14:31.660: E/AndroidRuntime(2739): at android.app.ActivityThread.access$600(ActivityThread.java:141)
10-21 11:14:31.660: E/AndroidRuntime(2739): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
10-21 11:14:31.660: E/AndroidRuntime(2739): at android.os.Handler.dispatchMessage(Handler.java:99)
10-21 11:14:31.660: E/AndroidRuntime(2739): at android.os.Looper.loop(Looper.java:137)
10-21 11:14:31.660: E/AndroidRuntime(2739): at android.app.ActivityThread.main(ActivityThread.java:5103)
10-21 11:14:31.660: E/AndroidRuntime(2739): at java.lang.reflect.Method.invokeNative(Native Method)
10-21 11:14:31.660: E/AndroidRuntime(2739): at java.lang.reflect.Method.invoke(Method.java:525)
10-21 11:14:31.660: E/AndroidRuntime(2739): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
10-21 11:14:31.660: E/AndroidRuntime(2739): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
10-21 11:14:31.660: E/AndroidRuntime(2739): at dalvik.system.NativeStart.main(Native Method)
10-21 11:14:31.660: E/AndroidRuntime(2739): Caused by: android.view.InflateException: Binary XML file line #7: Error inflating class fragment
10-21 11:14:31.660: E/AndroidRuntime(2739): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:713)
10-21 11:14:31.660: E/AndroidRuntime(2739): at android.view.LayoutInflater.rInflate(LayoutInflater.java:755)
10-21 11:14:31.660: E/AndroidRuntime(2739): at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
10-21 11:14:31.660: E/AndroidRuntime(2739): at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
10-21 11:14:31.660: E/AndroidRuntime(2739): at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
10-21 11:14:31.660: E/AndroidRuntime(2739): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:267)
10-21 11:14:31.660: E/AndroidRuntime(2739): at android.app.Activity.setContentView(Activity.java:1895)
10-21 11:14:31.660: E/AndroidRuntime(2739): at in.wptrafficanalyzer.locationroutemylocationv2.MainActivity.onCreate(MainActivity.java:50)
10-21 11:14:31.660: E/AndroidRuntime(2739): at android.app.Activity.performCreate(Activity.java:5133)
10-21 11:14:31.660: E/AndroidRuntime(2739): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
10-21 11:14:31.660: E/AndroidRuntime(2739): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)
10-21 11:14:31.660: E/AndroidRuntime(2739): ... 11 more
10-21 11:14:31.660: E/AndroidRuntime(2739): Caused by: java.lang.IllegalStateException: The meta-data tag in your app's AndroidManifest.xml does not have the right value. Expected 5089000 but found 0. You must have the following declaration within the <application> element: <meta-data android:name="com.google.android.gms.version" android:value="@integer/google_play_services_version" />
10-21 11:14:31.660: E/AndroidRuntime(2739): at com.google.android.gms.common.GooglePlayServicesUtil.A(Unknown Source)
10-21 11:14:31.660: E/AndroidRuntime(2739): at com.google.android.gms.common.GooglePlayServicesUtil.isGooglePlayServicesAvailable(Unknown Source)
10-21 11:14:31.660: E/AndroidRuntime(2739): at com.google.android.gms.maps.internal.u.I(Unknown Source)
10-21 11:14:31.660: E/AndroidRuntime(2739): at com.google.android.gms.maps.internal.u.H(Unknown Source)
10-21 11:14:31.660: E/AndroidRuntime(2739): at com.google.android.gms.maps.MapsInitializer.initialize(Unknown Source)
10-21 11:14:31.660: E/AndroidRuntime(2739): at com.google.android.gms.maps.SupportMapFragment$b.jz(Unknown Source)
10-21 11:14:31.660: E/AndroidRuntime(2739): at com.google.android.gms.maps.SupportMapFragment$b.a(Unknown Source)
10-21 11:14:31.660: E/AndroidRuntime(2739): at com.google.android.gms.dynamic.a.a(Unknown Source)
10-21 11:14:31.660: E/AndroidRuntime(2739): at com.google.android.gms.dynamic.a.onInflate(Unknown Source)
10-21 11:14:31.660: E/AndroidRuntime(2739): at com.google.android.gms.maps.SupportMapFragment.onInflate(Unknown Source)
10-21 11:14:31.660: E/AndroidRuntime(2739): at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:279)
10-21 11:14:31.660: E/AndroidRuntime(2739): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:685)
10-21 11:14:31.660: E/AndroidRuntime(2739): ... 21 more
10-21 11:19:32.260: I/Process(2739): Sending signal. PID: 2739 SIG: 9
答案 0 :(得分：1)
你的logcat清楚地说：
Caused by: java.lang.IllegalStateException: The meta-data tag in your app's AndroidManifest.xml does not have the right value. Expected 5089000 but found 0. You must have the following declaration within the element: 10-21 11:14:31.660: E/AndroidRuntime(2739): at
您需要在<meta-data>
<application>标记下添加Google Play服务版本manifest.xml标记
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
.......
......
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="API_Key" />
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
</application>
答案 1 :(得分：0)
试试这个。这对我有用。
<fragment
android:id="@+id/map"
android:name="com.google.android.gms.maps.MapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent" />
宣言文件：
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="key is here" />
答案 2 :(得分：0)
在AndroidManifest.xml中也使用以下用户权限
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<!--
The following two permissions are not required to use
Google Maps Android API v2, but are recommended.
-->
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />