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android - 使用 Camera Intent 后对照片进行地理标记

转载 作者:太空宇宙 更新时间:2023-11-03 10:50:50 24 4
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我有一个使用 Android Camera Intent 拍照的应用程序,拍照后我试图将一些 gps 数据添加到图像的 Exif 数据中。但是,我的应用在到达 double longitude = location.getLongitude();

时一直崩溃

这是我的代码:

         public void onCreate(Bundle savedInstanceState) 
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);


File folder = new File(Environment.getExternalStorageDirectory() + "/SApp");
if(folder.exists() == false){
folder.mkdirs();
}

setCamera();

}


private void setCamera(){
Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT,Uri.fromFile(new File(Environment.getExternalStorageDirectory(),"/SApp/Attachment" + ".jpg")));
startActivityForResult(cameraIntent, 1001);
}

protected void onActivityResult(int requestCode, int resultCode, Intent data){

if(resultCode == RESULT_OK){

LocationManager lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
Location location = (Location) lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);

double longitude = location.getLongitude();
double latitude = location.getLatitude();
File f = new File(Environment.getExternalStorageDirectory(),"/SApp/Attachment" + ".jpg");
geoTag(f.getAbsolutePath(),latitude,longitude);

}
}


public void geoTag(String filename, double latitude, double longitude){
ExifInterface exif;

try {
exif = new ExifInterface(filename);
int num1Lat = (int)Math.floor(latitude);
int num2Lat = (int)Math.floor((latitude - num1Lat) * 60);
double num3Lat = (latitude - ((double)num1Lat+((double)num2Lat/60))) * 3600000;

int num1Lon = (int)Math.floor(longitude);
int num2Lon = (int)Math.floor((longitude - num1Lon) * 60);
double num3Lon = (longitude - ((double)num1Lon+((double)num2Lon/60))) * 3600000;

exif.setAttribute(ExifInterface.TAG_GPS_LATITUDE, num1Lat+"/1,"+num2Lat+"/1,"+num3Lat+"/1000");
exif.setAttribute(ExifInterface.TAG_GPS_LONGITUDE, num1Lon+"/1,"+num2Lon+"/1,"+num3Lon+"/1000");


if (latitude > 0) {
exif.setAttribute(ExifInterface.TAG_GPS_LATITUDE_REF, "N");
} else {
exif.setAttribute(ExifInterface.TAG_GPS_LATITUDE_REF, "S");
}

if (longitude > 0) {
exif.setAttribute(ExifInterface.TAG_GPS_LONGITUDE_REF, "E");
} else {
exif.setAttribute(ExifInterface.TAG_GPS_LONGITUDE_REF, "W");
}

exif.saveAttributes();
} catch (IOException e) {
Log.e("PictureActivity", e.getLocalizedMessage());
}

}

错误跟踪:

11-27 10:17:25.865: E/AndroidRuntime(27201): FATAL EXCEPTION: main
11-27 10:17:25.865: E/AndroidRuntime(27201): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1001, result=-1, data=null} to activity {serverbased.app/serverbased.app.ServerAppActivity}: java.lang.NullPointerException
11-27 10:17:25.865: E/AndroidRuntime(27201): at android.app.ActivityThread.deliverResults(ActivityThread.java:2994)
11-27 10:17:25.865: E/AndroidRuntime(27201): at android.app.ActivityThread.handleSendResult(ActivityThread.java:3037)
11-27 10:17:25.865: E/AndroidRuntime(27201): at android.app.ActivityThread.access$1100(ActivityThread.java:128)
11-27 10:17:25.865: E/AndroidRuntime(27201): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1191)
11-27 10:17:25.865: E/AndroidRuntime(27201): at android.os.Handler.dispatchMessage(Handler.java:99)
11-27 10:17:25.865: E/AndroidRuntime(27201): at android.os.Looper.loop(Looper.java:137)
11-27 10:17:25.865: E/AndroidRuntime(27201): at android.app.ActivityThread.main(ActivityThread.java:4514)
11-27 10:17:25.865: E/AndroidRuntime(27201): at java.lang.reflect.Method.invokeNative(Native Method)
11-27 10:17:25.865: E/AndroidRuntime(27201): at java.lang.reflect.Method.invoke(Method.java:511)
11-27 10:17:25.865: E/AndroidRuntime(27201): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:980)
11-27 10:17:25.865: E/AndroidRuntime(27201): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:747)
11-27 10:17:25.865: E/AndroidRuntime(27201): at dalvik.system.NativeStart.main(Native Method)
11-27 10:17:25.865: E/AndroidRuntime(27201): Caused by: java.lang.NullPointerException
11-27 10:17:25.865: E/AndroidRuntime(27201): at serverbased.app.ServerAppActivity.onActivityResult(ServerAppActivity.java:139)
11-27 10:17:25.865: E/AndroidRuntime(27201): at android.app.Activity.dispatchActivityResult(Activity.java:4654)
11-27 10:17:25.865: E/AndroidRuntime(27201): at android.app.ActivityThread.deliverResults(ActivityThread.java:2990)
11-27 10:17:25.865: E/AndroidRuntime(27201): ... 11 more
11-27 10:17:39.794: I/Process(27201): Sending signal. PID: 27201 SIG: 9

如有任何帮助,我们将不胜感激!

最佳答案

您错误地检索了位置。我会好好看看这篇博文:A Deep Dive Into Location .它将为您提供一些最佳实践。调用 getLastKnownLocation 不会启动位置提供程序。 null 返回值表示没有可用的值。您应该使用 requestLocationUpdates。请参阅下面的代码段:

LocationManager lm = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);

Criteria fineCriteria.setAccuracy(Criteria.ACCURACY_FINE);
String fineProvider = lm.getBestProvider(fineCriteria, true);

// Start the fine location listener
lm.requestLocationUpdates(fineProvider, 0, 0, locationListenerFine);

private LocationListener locationListenerFine = new LocationListener() {
public void onLocationChanged(Location location) {

}

public void onProviderDisabled(String provider) {
}

public void onProviderEnabled(String provider) {
}

public void onStatusChanged(String provider, int status, Bundle extras) {
}
};

关于android - 使用 Camera Intent 后对照片进行地理标记,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/13587070/

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