Develop Reference

Android Studio's navigation problem throws error java.lang.IllegalArgumentException

So i have been trying to get a button to work and navigate through to another fragment but only accessible from that button, which i want separate from my bottom nav bar, that one works
the main issue i find is that when trying to add these actions just like i would with the bottom navigation it throws an java.lang.IllegalArgumentException: ID does not reference a View inside this Activity
can anyone point me in the right direction and tell me what I'm doing wrong?
I think its to do with confusion with the navhost fragments? MAybe they think it's the same and overwriting eachother? Idk, ive been going in circles, and disabling my bottom navigation bar doesnt fix it either.
Heres my Main Activity Code, along with the java fragment with the button i want to have this action.
public class MainActivity extends AppCompatActivity {
private AppBarConfiguration appBarConfiguration;
ActivityMainBinding binding;
BottomNavigationView bottomNavigationView; //initializing the bottom nav bar from activity_main again
#Override
protected void onCreate(Bundle savedInstanceState) {//changing content which is based on the activity_main class, think of activity_main as the main driver class, where everything is activated at
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
binding = ActivityMainBinding.inflate(getLayoutInflater());
setContentView(binding.getRoot());
//FROM HERE
NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment_content_main);
appBarConfiguration = new AppBarConfiguration.Builder(navController.getGraph()).build();
NavigationUI.setupActionBarWithNavController(this, navController, appBarConfiguration);
//TO HERE THESE PARTS THROW THE EXCEPTIONS
#Override
public boolean onSupportNavigateUp() {
NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment_content_main);
return NavigationUI.navigateUp(navController, appBarConfiguration)
|| super.onSupportNavigateUp();
}
}
Along with the code for my navigation graph, the other actions in there, are for my bottom navigation, which is why one fragment has 2 actions, 1 foor that button, shared with the same nav _graph,
<navigation 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:id="#+id/my_nav"
app:startDestination="#id/fl1">
<fragment
android:id="#+id/fl1"
android:name="com.example.appnav.FirstFragment"
android:label="fragment_first"
tools:layout="#layout/fragment_first" >
<action
android:id="#+id/action_firstFragment_to_secondFragment"
app:destination="#id/fl2" />
<!--These fragments (pages) are all linked by the action button with where they end up on click -->
</fragment>
<fragment
android:id="#+id/fl2"
android:name="com.example.appnav.SecondFragment"
android:label="fragment_second"
tools:layout="#layout/fragment_second" >
<action
android:id="#+id/action_secondFragment_to_frag3"
app:destination="#id/fl3" />
<action
android:id="#+id/action_fl2_to_flp"
app:destination="#id/flp" />
</fragment>
<fragment
android:id="#+id/fl3"
android:name="com.example.appnav.frag3"
android:label="fragment_frag3"
tools:layout="#layout/fragment_frag3" >
<action
android:id="#+id/action_fl3_to_fl4"
app:destination="#id/fl4" />
</fragment>
<fragment
android:id="#+id/fl4"
android:name="com.example.appnav.frag4"
android:label="fragment_frag4"
tools:layout="#layout/fragment_frag4" >
<action
android:id="#+id/action_fl4_to_fl5"
app:destination="#id/fl5" />
</fragment>
<fragment
android:id="#+id/fl5"
android:name="com.example.appnav.fragt"
android:label="fragment_fragt"
tools:layout="#layout/fragment_temp"/>
<fragment
android:id="#+id/flp"
android:name="com.example.appnav.pay_frag"
android:label="pay_frag"
tools:layout="#layout/pay_frag" >
<action
android:id="#+id/action_flp_to_fl_pdone"
app:destination="#id/fl_pdone" />
</fragment>
<fragment
android:id="#+id/fl_pdone"
android:name="com.example.appnav.fl_pdone"
android:label="fragment_fl_pdone"
tools:layout="#layout/fragment_fl_pdone" />
</navigation>
This is the fragment with the button involved
basically trying to use the action from the nav_graph, and take u to the next fragment, in this case a fragment which is not on the bottom navigation
public class SecondFragment extends Fragment {
private FragmentSecondBinding binding;
#Override
public View onCreateView(
LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState
) {
binding = FragmentSecondBinding.inflate(inflater, container, false);
return binding.getRoot();
}
public void onViewCreated(#NonNull View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
binding.buttonSecond.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
NavHostFragment.findNavController(SecondFragment.this)
.navigate(R.id.action_fl2_to_flp);
}
});
}
#Override
public void onDestroyView() {
super.onDestroyView();
binding = null;
}

NavController wants view not context. Just change your context to view as below.
binding.buttonSecond.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
NavHostFragment.findNavController(view)
.navigate(R.id.action_fl2_to_flp);
}
});
If not solved, let me know.

calling maps activity from fragment error support manager [duplicate]

I have a problem with Google Maps, i.e. getSupportFragmentManager().findFragmentById returns always null. Do you have an idea how to solve this?
Here is the code:
fragment_map.xml:
<FrameLayout 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="com.myapp.something.MapFragment">
<fragment
android:id="#+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.SupportMapFragment" />
</FrameLayout>
MapsFragment.java:
public class MapFragment extends Fragment implements OnMapReadyCallback, android.location.LocationListener
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
SupportMapFragment mapFragment = (SupportMapFragment) this.getActivity().getSupportFragmentManager().findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
...
I have Google Maps in Activity and it works with code:
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
I am trying to reuse this in fragment, becouse I need maps in fragment, not in activity, but it doesn't work.
I tried:
calling this code in "onCreateView" function
SupportMapFragment mapFragment = (SupportMapFragment) getFragmentManager().findFragmentById(R.id.map);
GoogleMap mGoogleMap = ((SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.map)).getMap(); is deprecated, and application crashes
SupportMapFragment mapFragment = (SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.map);
and similar variations, but in all cases I get null for mapFragment.
Do you know how could I solve this problem?

The problem is that you're trying to use the Activity's FragmentManager, and you should be using the Fragment's child FragmentManager.
Remove the onCreate() override in the Fragment, and add an onCreateView() Override where you inflate the layout and call getMapAsync():
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_map, container, false);
SupportMapFragment mapFragment = (SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
return rootView;
}

include an activity inside a tab result in full screen activity

tabbed activity overrides by activity when follow android tabbed activity.
I am a newbie in android. I am learning to include some activities on different tabs. however, the activity gets fullscreen and override the main tab
// TabMain.java
public class TabMain extends AppCompatActivity {
.......
}
// SectionsPagerAdapter.java extends FragmentPagerAdapter
#Override
public Fragment getItem(int position) {
switch (position){
case 1:
FragmentTab1 tab1 = new FragmentTab1();
return tab1;
default:
return PlaceholderFragment.newInstance(position + 1);
}
}
public class FragmentTab1 extends Fragment {
#Override
public View onCreateView(
#NonNull LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View root = inflater.inflate(R.layout.galery_main_layout, container, false);
Intent intent = new Intent(getActivity(), UploadMain.class);
getActivity().startActivity(intent);
return root;
}
}
the UploadMain.java implement Activity
<application
android:icon="#drawable/icon"
android:label="#string/app_name">
<activity
android:name=".TabMain"
android:label="#string/title_activity_tab_main"
android:theme="#style/AppTheme.NoActionBar">
</activity>
<activity
android:name=".FdActivity"
android:configChanges="keyboardHidden|orientation"
android:label="#string/app_name"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".UploadMain"
android:configChanges="keyboardHidden|orientation"
>
</activity>
</application>
I am expecting for the upload main class to be inside tab2
TabMain
| Tab 1 (other activity)
| Tab 2 (UploadMain)

You can't have a Activity inside a ViewPager, it must be a fragment.
And also, when you start activity, like this,startActivity(intent) it will not replace the previous screen or activity, it will just create a new activity with a new layout, having the previous activity paused (and also sometimes stopped) until you close the previous activity. You need to learn more about activity and fragment lifecycles

Your FragmentTab1 starts a new Activity instead of only replacing the View inside your framelayout you start a whole new Activity. Your Code belongs inside the class Fragmenttab1 and the line
Intent intent = new Intent(getActivity(), UploadMain.class);
getActivity().startActivity(intent);
should be removed

android google map issues

I am currently building an android app. I understand the basics and I did a number of apps but now my project is bigger. My app include a number of screens with NavigationDrawer included which forces me to use an extension of Fragment class on every class I want to be displayed on my application.
Here is my problem -some time ago I create an app a simple one page google maps screen and it works just fine. I want to do the same thing on the app I am currently working on but all it gives me when I go to the page is the google log at the bottom left screen and the rest is grey like view (no map is displayed).I searched for solution in a lot of places including this site and I could get as an answer was that it might have to do with my API key given to me by google.I ckecked that and I am pretty sure it is not from the key because I applied it on my one page google map app and it worked perfect.I also have all the permissions needed I checked that like 6 times.So my conclusion is there is something in the code that is preventing the map to be displayed.
Here is my code:
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.google.android.gms.maps.GoogleMap;
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 guide extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// inflat and return the layout
View v = inflater.inflate(R.layout.test, container,
false);
return v;
}
class HoldFragmentPlace extends FragmentActivity{
private GoogleMap mMap;
public HoldFragmentPlace(){
}
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// inflat and return the layout
View v = inflater.inflate(R.layout.test, container,
false);
return v;
}
#Override
protected void onResume() {
super.onResume();
setUpMapIfNeeded();
}
private void setUpMapIfNeeded() {
// Do a null check to confirm that we have not already instantiated the map.
if (mMap == null) {
// Try to obtain the map from the SupportMapFragment.
mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
.getMap();
// Check if we were successful in obtaining the map.
if (mMap != null) {
setUpMap();
}
}
}
private void setUpMap() {
mMap.addMarker(new MarkerOptions().position(new LatLng(0, 0)).title("Marker"));
}
}
}
I need that Fragment extension for my NavigationDrawer to work so I create an inner class and applied the code for the map there.
Here is what I have in my manifest:
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="#string/google_maps_key" />
<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" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
And here is my xml for the map:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.gms.maps.MapView
android:id="#+id/mapView"
android:layout_width="match_parent"
android:layout_height="fill_parent"
class="com.google.android.gms.maps.SupportMapFragment"
android:layout_marginTop="-470dp" />
</LinearLayout>
I also tried a few other variations of the java code some of them does not include inner class and the result is still the same.I am either missing something very fundamental or I am misunderstanding some conception about Android.If you have read all that thank you for the spared time!

Check the APK signing. You have to assign a debug API key in testing and a Release API key when releasing APK. Insert the correct API key, clean and rebuild your project.
I've been there a year a go and I can assure that this was the problem. Double check your key and if it's a debug or release key.
Another thing to check is the package name of your app...
Let me know if you did and still get the grey view instead of the
UPDATE:
I was trying to include everything when I realized that your problem is only in the signing phase.
You only need to get the SHA-1 fingerprint of the debug keystore and put it in your API Key dialog. And trust me there's nothing I can write that can be more clear and informative than the Google documentation.
Follow the steps in this link to get the debug certificate and the SHA-1 fingerprint.
UPDATE 2:
In order to get the SHA-1 of the keystore you might check this thread .

I suspect some part missing :
(1) Declare permission to use MAPS_RECEIVE :
<permission android:name="com.example.yourpackage.permission.MAPS_RECEIVE" android:protectionLevel="signature"/>
<!-- after declare use this -->
<uses-permission android:name="com.example.yourpackage.permission.MAPS_RECEIVE"/>
(2) Missing Declare gms version variable :
<meta-data
android:name="com.google.android.gms.version"
android:value="#integer/google_play_services_version" />
(3) The API_KEY may have some problem with generation :
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="your_key" />
Please check with above 3 suspects first : then if still error is there you can re-confirm steps to enable Google Maps from here
Check things related to API_KEY carefully

You can use SupportMapFragment to display map in your fragment.
The xml should be changed to
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<fragment
android:id="#+id/mapView"
android:layout_marginTop="-470dp"
class="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
and your class would be like below
public class guide extends Fragment {
private GoogleMap mMap;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// inflat and return the layout
View v = inflater.inflate(R.layout.test, container, false);
((SupportMapFragment) getFragmentManager()
.findFragmentById(R.id.mapView)).getMapAsync (new OnMapReadyCallback(){
#Override
public void onMapReady(final GoogleMap map) {
this.mMap = map;
mMap.setMyLocationEnabled(true);
setUpMap();
}
});
return v;
}
private void setUpMap() {
mMap.addMarker(new MarkerOptions().position(new LatLng(0, 0)).title("Marker"));
}
}
Note: Please update your google play services if you dont find the getMapAsync method for your SupportMapFragment.

"Unfortunately -app- has stopped" on my fist android app ever [duplicate]

This question already has answers here:
Unfortunately MyApp has stopped. How can I solve this?
(23 answers)
Closed 8 years ago.
I've been having this issue, this is my first android app and I probably did something stupid. I am a total noob at this and this has been driving me insane. Running the app will give me the error, "Unfortunately -app- has stopped working." Help would be appreciated
Fragment Main:
<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"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.gmail.sherwoodax.appone.MainActivity$PlaceholderFragment" >
<Button
android:id="#+id/dBID"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Dead Button"
android:layout_centerInParent="true"
/>
<TextView
android:id="#+id/tView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="The Button is below me"
android:layout_above="#+id/dBID"
android:gravity="center"
android:textSize="20sp"
/>
</RelativeLayout>
Main Class:
package com.gmail.sherwoodax.appone;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.app.ActionBarActivity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment())
.commit();
testMethod();
}
}
private void testMethod() {
Button b = (Button) findViewById(R.id.dBID);
b.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Toast.makeText(MainActivity.this, "text", Toast.LENGTH_LONG).show();
}
});
}
#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;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
return rootView;
}
}
}
Manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.gmail.sherwoodax.appone"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="19" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.gmail.sherwoodax.appone.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
LogCat stacktrace:
05-28 11:15:54.977: E/AndroidRuntime(31586): Caused by: java.lang.IllegalArgumentException: No view found for id 0x7f05003c (com.gmail.sherwoodax.appone:id/container) for fragment PlaceholderFragment{41c157b0 #0 id=0x7f05003c}
05-28 11:20:47.344: E/AndroidRuntime(32409): Caused by: java.lang.IllegalArgumentException: No view found for id 0x7f05003c (com.gmail.sherwoodax.appone:id/container) for fragment PlaceholderFragment{41c10d00 #0 id=0x7f05003c}
Thank you

Please post the logcat stacktrace for the crash so we can help pinpoint the exact problem. However, I would guess that it has to do with your Button.
In your testMethod() you declare:
Button b = (Button) findViewById(R.id.dBID);
But because it is declared inside this method it is not within scope for your activity and exists only inside that single method call and is lost afterwards.
You should declare your button as a class level variable in your Activity/Fragment:
public class MainActivity extends ActionBarActivity {
private Button myButton;
...
then assign the Button in your onCreate() (or onViewCreate() for a Fragment):
public void onCreate(...) {
myButton = (Button) findViewById(...);
...
and then anywhere else in your class you want to use that Button you can refer to it without needing to pull and cast it again from your view:
button.setText(newButtonText);