-1
私は特定の場所を表示する必要があるタスクを解決する必要がありますデータベースからの緯度経度は現在の場所から100メートル以内です。ここでjava.lang.NullPointerException：nullオブジェクトリファレンスで仮想メソッド 'java.lang.String java.lang.String.trim（）'を呼び出そうとしました
私の主な活動です：
@Override
protected void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
MultiDex.install(this);
setContentView(R.layout.activity_maps);
//etOrigin = (EditText) findViewById(R.id.etOrigin);
btnFindPath = (Button) findViewById(R.id.btnFindPath);
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
DatabaseHandler db = new DatabaseHandler(getApplicationContext());
// Inserting Contacts
Log.d("Insert: ", "Inserting ..");
// db.addLocation(new LocationManager(1,);
db.addLocation(new LocationManager(1, "23.780551", "90.416380", "Gulshan-1"));
db.addLocation(new LocationManager(2, "23.780315", "90.418354", "Gulshan-1"));
db.addLocation(new LocationManager(3, "23.780472", "90.415093", "Gulshan-1"));
db.addLocation(new LocationManager(4, "23.780786", "90.422817", "Gulshan-1"));
db.addLocation(new LocationManager(5, "23.776734", "90.425558", "Badda"));
db.addLocation(new LocationManager(6, "23.776538", "90.425601", "Badda"));
db.addLocation(new LocationManager(7, "23.776572", "90.425563", "Badda"));
db.addLocation(new LocationManager(8, "23.776911", "90.425595", "Badda"));
db.addLocation(new LocationManager(9, "23.781436", "90.425442", "Pran RFl"));
db.addLocation(new LocationManager(10, "23.781293", "90.425583", "Pran RFl"));
db.addLocation(new LocationManager(11, "23.781307", "90.425280", "Pran RFl"));
db.addLocation(new LocationManager(12, "23.781481", "90.425591", "Pran RFl"));
btnFindPath.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mMap.clear();
sendRequest();
}
});
}
@Override
public void onPause() {
super.onPause();
if (mGoogleApiClient != null) {
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
}
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
buildGoogleApiClient();
mMap.setMyLocationEnabled(true);
} else {
checkLocationPermission();
}
}
else {
buildGoogleApiClient();
mMap.setMyLocationEnabled(true);
}
}
protected synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
mGoogleApiClient.connect();
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
/* mMap.setMyLocationEnabled(true);*/
}
@Override
public void onConnected(Bundle bundle) {
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(1000);
mLocationRequest.setFastestInterval(1000);
mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
}
@Override
public void onConnectionSuspended(int i) {}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {}
@Override
public void onLocationChanged(Location location)
{
mLastLocation = location;
if (mCurrLocationMarker != null) {
mCurrLocationMarker.remove();
}
//Place current location marker
latitude = location.getLatitude();
longitude = location.getLongitude();
// to get current location without click event code has to be added here
if (mGoogleApiClient != null) {
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
}
}
public static final int MY_PERMISSIONS_REQUEST_LOCATION = 99;
private void checkLocationPermission() {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
if (ActivityCompat.shouldShowRequestPermissionRationale(this,
Manifest.permission.ACCESS_FINE_LOCATION)) {
new AlertDialog.Builder(this)
.setTitle("Location Permission Needed")
.setMessage("This app needs the Location permission, please accept to use location functionality")
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
//Prompt the user once explanation has been shown
ActivityCompat.requestPermissions(MapsActivity.this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_LOCATION);
}
})
.create()
.show();
} else {
// No explanation needed, we can request the permission.
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_LOCATION);
}
}
}
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case MY_PERMISSIONS_REQUEST_LOCATION: {
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
if (mGoogleApiClient == null) {
buildGoogleApiClient();
}
mMap.setMyLocationEnabled(true);
}
} else {
Toast.makeText(this, "permission denied", Toast.LENGTH_LONG).show();
}
return;
}
}
}
private double findDistance(double lat1, double lon1, double lat2, double lon2) {
double theta = lon1 - lon2;
double dist = Math.sin(deg2rad(lat1)) * Math.sin(deg2rad(lat2)) + Math.cos(deg2rad(lat1)) * Math.cos(deg2rad(lat2)) * Math.cos(deg2rad(theta));
dist = Math.acos(dist);
dist = rad2deg(dist);
dist = dist * 60 * 1.1515;
return (dist);
}
private double deg2rad(double deg) {
return (deg * Math.PI/180.0);
}
private double rad2deg(double rad) {
return (rad * 180.0/Math.PI);
}
private void sendRequest() {
LatLng latLng = new LatLng(latitude,longitude);
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(latLng);
markerOptions.title("Current Position");
markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA));
mCurrLocationMarker = mMap.addMarker(markerOptions);
CircleOptions addCircle = new CircleOptions().center(latLng).radius(radiusInMeters).fillColor(shadeColor).strokeColor(strokeColor).strokeWidth(8);
mCircle = mMap.addCircle(addCircle);
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
mMap.animateCamera(CameraUpdateFactory.zoomTo(11));
DatabaseHandler db = new DatabaseHandler(getApplicationContext());
List<LocationManager> locations = db.getAllLocations();
for (LocationManager cn : locations) {
finlat1 = Double.valueOf(cn.getLatitude());
finlon2 = Double.valueOf(cn.getLongitude());
String name = cn.getPlacename();
double distance = findDistance(latitude, longitude, finlat2, finlon2) * 1000;
if (distance <= 100.00) {
LatLng venus = new LatLng(finlat2, finlon2);
Log.wtf("venus:", String.valueOf(venus));
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(venus, 18));
originMarkers.add(mMap.addMarker(new MarkerOptions()
.icon(BitmapDescriptorFactory.fromResource(R.drawable.mark))
.title(name)
.position(venus)));
}
}
return;
}
}
マイデシベルハンドラは次のとおりです。DatabaseHandler.java
package com.pran.vehicletrackingapp.dbhelper;
/**
* Created by Administrator on 11/30/2016.
*/
import java.util.ArrayList;
import java.util.List;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import static java.lang.Integer.*;
public class DatabaseHandler extends SQLiteOpenHelper {
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_NAME = "locationStore";
private static final String TABLE_LOCATION = "locations";
private static final String KEY_ID = "id";
private static final String KEY_LATITUDE = "latitude";
private static final String KEY_LONGITUDE = "longitude";
private static final String KEY_PLACENAME = "placename";
// private static final String KEY_PH_NO = "phone_number";
public DatabaseHandler(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
//3rd argument to be passed is CursorFactory instance
}
// Creating Tables
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_LOCATION_TABLE = "CREATE TABLE " + TABLE_LOCATION + "("
+ KEY_ID + " ID INTEGER PRIMARY KEY AUTOINCREMENT ,"
+ KEY_LATITUDE + " TEXT ,"
+ KEY_LONGITUDE + " TEXT ,"
+ KEY_PLACENAME + " TEXT,"
+ ")";
db.execSQL(CREATE_LOCATION_TABLE);
}
// Upgrading database
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// Drop older table if existed
db.execSQL("DROP TABLE IF EXISTS " + TABLE_LOCATION);
// Create tables again
onCreate(db);
}
// code to add the new contact
public void addLocation(LocationManager location) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_ID , location.getID());
values.put(KEY_LATITUDE, location.getLatitude());
values.put(KEY_LONGITUDE , location.getLongitude());
values.put(KEY_PLACENAME, location.getPlacename()); // Contact Name
//values.put(KEY_PH_NO, location.getPhoneNumber()); // Contact Phone
// Inserting Row
db.insert(TABLE_LOCATION, null, values);
//2nd argument is String containing nullColumnHack
db.close(); // Closing database connection
}
// code to get the single contact
LocationManager getLocation(int id) {
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(TABLE_LOCATION, new String[] {
KEY_ID,KEY_LONGITUDE,KEY_LONGITUDE,KEY_PLACENAME}, KEY_ID + "=?",
new String[] { String.valueOf(id) }, null, null, null, null);
if (cursor != null)
cursor.moveToFirst();
LocationManager location = new LocationManager(cursor.getInt(0),cursor.getString(1),cursor.getString(2),cursor.getString(3));
// return contact
return location;
}
// code to get all contacts in a list view
public List<LocationManager> getAllLocations() {
List<LocationManager> contactList = new ArrayList<LocationManager>();
// Select All Query
String selectQuery = "SELECT * FROM " + TABLE_LOCATION;
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
LocationManager location = new LocationManager();
location.setID(cursor.getInt(0));
location.setLatitude(cursor.getString(1));
location.setLongitude(cursor.getString(2));
location.setPlacename(cursor.getString(3));
// contact.setPhoneNumber(cursor.getString(2));
// Adding contact to list
contactList.add(location);
} while (cursor.moveToNext());
}
// return contact list
return contactList;
}
// code to update the single contact
public int updateLocation(LocationManager location) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_ID , location.getID());
values.put(KEY_LATITUDE, location.getLatitude());
values.put(KEY_LONGITUDE , location.getLongitude());
values.put(KEY_PLACENAME, location.getPlacename());
// updating row
return db.update(TABLE_LOCATION, values, KEY_ID + " = ?",
new String[] { String.valueOf(location.getID()) });
}
// Deleting single contact
public void deleteLocation(LocationManager location) {
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE_LOCATION, KEY_ID + " = ?",
new String[] { String.valueOf(location.getID()) });
db.close();
}
// Getting contacts Count
public int getLocationCount() {
String countQuery = "SELECT * FROM " + TABLE_LOCATION;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(countQuery, null);
cursor.close();
// return count
return cursor.getCount();
}
}
しかし、それはエラーを示している：
FATAL EXCEPTION: main Process: com.pran.vehicletrackingapp, PID: 16019 java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.String.trim()' on a null object reference at java.lang.StringToReal.parseDouble(StringToReal.java:263) at java.lang.Double.parseDouble(Double.java:301) at java.lang.Double.valueOf(Double.java:338) at com.pran.vehicletrackingapp.MapsActivity.sendRequest(MapsActivity.java:323) at com.pran.vehicletrackingapp.MapsActivity.access$100(MapsActivity.java:46) at com.pran.vehicletrackingapp.MapsActivity$1.onClick(MapsActivity.java:118) at android.view.View.performClick(View.java:5716) at android.widget.TextView.performClick(TextView.java:10926) at android.view.View$PerformClick.run(View.java:22596) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:7325) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
私は解決することができますどのようにそれ？
質問にあなたの編集は完全にそれを変更し、新しいエラーこの回答無用 – antonio
実際にそれを掲示した後、私が見つけたproblem.Butをレンダリングが見つかりました。 :) –
この場合、最良の選択肢はあなたの新しい問題で新しい質問を投稿することです – antonio