Joe Williamson
Reputation: 169
How can I extend SupportMapFragment in Android Studio?
I want to create a custom map fragment that has my zoom settings, marker, and map type settings so that I can reuse it across several activities. The class I created is called "LiteMap".
I get an error from the compiler
'Incompatible Types' 'Required: com.mypackage.LiteMap' 'Found com.google.android.gms.maps.SupportMapFragment'
where I call .newInstance. I assume that .newInstance returns the parent class instead of my class but I'm not sure how to override in my class to return my "LiteMap" object.
As an alternative I have tried instantiating my map object using new and I get the following error without any specific line as the source but it appears that using new isn't creating the LiteMap object. Is what I want to do impossible or stupid way of doing it?
03-29 20:36:52.771 11326-11326/com.tremulant.phield E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.tremulant.phield, PID: 11326
java.lang.RuntimeException: Unable to resume activity {com.tremulant.phield/com.tremulant.phield.ReviewDetails}: java.lang.NullPointerException: Attempt to invoke interface method 'void maps.ei.bz.o()' on a null object reference
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2974)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3005)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2371)
at android.app.ActivityThread.access$800(ActivityThread.java:149)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1284)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5290)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:908)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:703)
Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'void maps.ei.bz.o()' on a null object reference
at maps.ei.n.b(Unknown Source)
at com.google.android.gms.maps.internal.i$a.onTransact(:com.google.android.gms.alldynamite:115)
at android.os.Binder.transact(Binder.java:380)
at com.google.android.gms.maps.internal.IMapFragmentDelegate$zza$zza.onResume(Unknown Source)
at com.google.android.gms.maps.SupportMapFragment$zza.onResume(Unknown Source)
at com.google.android.gms.dynamic.zza$7.zzb(Unknown Source)
at com.google.android.gms.dynamic.zza.zza(Unknown Source)
at com.google.android.gms.dynamic.zza.onResume(Unknown Source)
at com.google.android.gms.maps.SupportMapFragment.onResume(Unknown Source)
at android.support.v4.app.Fragment.performResume(Fragment.java:2020)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1107)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1252)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1234)
at android.support.v4.app.FragmentManagerImpl.dispatchResume(FragmentManager.java:2056)
at android.support.v4.app.FragmentController.dispatchResume(FragmentController.java:196)
at android.support.v4.app.FragmentActivity.onResumeFragments(FragmentActivity.java:505)
at android.support.v4.app.FragmentActivity.onPostResume(FragmentActivity.java:494)
at android.support.v7.app.AppCompatActivity.onPostResume(AppCompatActivity.java:174)
at android.app.Activity.performResume(Activity.java:6119)
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2963)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3005)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2371)
at android.app.ActivityThread.access$800(ActivityThread.java:149)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1284)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5290)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:908)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:703)
03-29 20:36:52.822 11326-11326/? I/Process: Sending signal. PID: 11326 SIG: 9
LiteMap Fragment
package com.tremulant.phield;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
public class LiteMap extends SupportMapFragment implements OnMapReadyCallback {
private GoogleMap mMap;
String lat;
String lng;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
//super.onCreate(savedInstanceState);
lat = getArguments().getString("Lat");
lng = getArguments().getString("Lng");
return inflater.inflate(R.layout.maplite,null);
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
LatLng mapVenue = new LatLng(Double.parseDouble(lat), Double.parseDouble(lng));
mMap.addMarker(new MarkerOptions().position(mapVenue));
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(mapVenue, 14.0f));
}
}
maplite.xml layout file for fragment
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="25dp"
android:layout_height="fill_parent"
android:weightSum="10">
<fragment
android:id="@+id/lmap"
android:layout_width="match_parent"
android:layout_height="25dp"
class="com.tremulant.phield.LiteMap" />
</LinearLayout>
package com.tremulant.phield;
import android.content.Intent;
import android.graphics.Typeface;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class ReviewDetails extends BaseActivity implements View.OnClickListener{
private Venue mVenue;
@Override
public void onClick(View v) {
Intent mapIntent = new Intent(ReviewDetails.this, VenueMap.class);
mapIntent.putExtra(VENUE_TRANSFER,mVenue);
startActivity(mapIntent);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_review_details);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
Intent intent = getIntent();
mVenue = (Venue) intent.getSerializableExtra(VENUE_TRANSFER);
LiteMap liteMap = new LiteMap();
//lmap.setArguments(args);
android.support.v4.app.FragmentTransaction fragmentTransaction =
getSupportFragmentManager().beginTransaction();
fragmentTransaction.add(R.id.map_container, liteMap);
fragmentTransaction.commit();
}
}
content_review_details.xml layout file
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.tremulant.phield.ReviewDetails"
tools:showIn="@layout/activity_review_details">
<FrameLayout
android:id="@+id/map_container"
android:layout_below="@id/map"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</FrameLayout>
</RelativeLayout>
I simplified my code. Also I don't understand why when I paste my code in here it doesn't indent properly. ugh! Now my logcat shows the following in a loop. The screen just stays black when ReviewDetails activity tries to load.
03-30 20:58:28.364 17076-17076/com.tremulant.phield I/ViewRootImpl:
ViewRoot's Touch Event : ACTION_DOWN
03-30 20:58:28.466 17076-17076/com.tremulant.phield I/ViewRootImpl: ViewRoot's Touch Event : ACTION_UP
03-30 20:58:28.503 17076-17076/com.tremulant.phield I/Timeline: Timeline: Activity_launch_request id:com.tremulant.phield time:25955914
03-30 20:58:28.552 17076-17076/com.tremulant.phield I/Timeline: Timeline: Activity_launch_request id:com.tremulant.phield time:25955964
03-30 20:58:28.600 17076-17076/com.tremulant.phield D/ContextHelper: convertTheme. context->name=com.tremulant.phield themeResourceId=2131427455
03-30 20:58:28.604 17076-17076/com.tremulant.phield D/ContextHelper: convertTheme. context->name=com.tremulant.phield themeResourceId=2131427455
03-30 20:58:28.606 17076-17076/com.tremulant.phield I/PhoneWindow: [generateLayout] setColorNavigationBar => color=0x ff00796b
03-30 20:58:28.753 17076-17076/com.tremulant.phield I/zzad: Making Creator dynamically
03-30 20:58:28.763 17076-17076/com.tremulant.phield W/ResourcesManager: Asset path '/system/framework/com.android.media.remotedisplay.jar' does not exist or contains no resources.
03-30 20:58:28.763 17076-17076/com.tremulant.phield W/ResourcesManager: Asset path '/system/framework/com.android.location.provider.jar' does not exist or contains no resources.
03-30 20:58:28.839 17076-17076/com.tremulant.phield D/ChimeraCfgMgr: Reading stored module config
03-30 20:58:28.878 17076-17076/com.tremulant.phield D/ChimeraFileApk: Primary ABI of requesting process is armeabi-v7a
03-30 20:58:28.879 17076-17076/com.tremulant.phield I/art: DexFile_isDexOptNeeded failed to open oat file '/data/dalvik-cache/arm/data@[email protected]@app_chimera@m@[email protected]@classes.dex' for file location '/data/data/com.google.android.gms/app_chimera/m/00000000/DynamiteModules-prod.apk': Failed to open oat filename for reading: No such file or directory
03-30 20:58:28.880 17076-17076/com.tremulant.phield D/ChimeraFileApk: Classloading successful. Optimized code found.
03-30 20:58:29.044 17076-17076/com.tremulant.phield I/Google Maps Android API: Google Play services client version: 8487000
03-30 20:58:29.055 17076-17076/com.tremulant.phield I/Google Maps Android API: Google Play services package version: 8703230
03-30 20:58:29.331 17076-17076/com.tremulant.phield I/Google Maps Android API: Google Play services package version: 8703230
03-30 20:58:29.339 17076-17076/com.tremulant.phield I/Google Maps Android API: Google Play services package version: 8703230
03-30 20:58:29.344 17076-17076/com.tremulant.phield I/Google Maps Android API: Google Play services package version: 8703230
03-30 20:58:29.352 17076-17076/com.tremulant.phield I/Google Maps Android API: Google Play services package version: 8703230
03-30 20:58:29.361 17076-17076/com.tremulant.phield I/Google Maps Android API: Google Play services package version: 8703230
Upvotes: 2
Views: 2715
Answers (2)
Pratik Dodiya
Reputation: 2687
I am also facing kotlin.KotlinNullPointerException in MapFragment class as below
Old Code
val mapFragment = activity!!.supportFragmentManager.findFragmentById(R.id.map) as? SupportMapFragment
mapFragment!!.getMapAsync(this)
Correct Code
It resolved the error in Kotlin
val mapFragment = childFragmentManager.findFragmentById(R.id.map) as? SupportMapFragment
mapFragment!!.getMapAsync(this)
Upvotes: 0
Alexander Tumanin
Reputation: 1842
If you still need the answer:
Change your maplite.xml to:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:map="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="25dp">
<fragment
android:id="@+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
class="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
Extend android.support.v4.app.Fragment instead of SupportMapFragment in your LiteMap fragment.
After your onCreateView in MapLite fragment put:
@Override
public void onResume() {
super.onResume();
SupportMapFragment smf = ((SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.map));
smf.getMapAsync(this);
}
Upvotes: 5
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