This is not a duplicate! I've read the other question, but the answers it provided didn't work (I've just declared my object when I reference it; there's no way it's null) I'm not sure how stackoverflow works yet, but I'd hate to see this locked over a misunderstanding.
After hours of googling and combing through my code I'm baffled.
I'm attempting to replace one fragment (ScriptsFragment) with another fragment (ScenesFragment) within ScriptFragment's code. When fragment manager tries to replace, it throws the error:
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.alecdb.lineburner/com.alecdb.lineburner.ScriptsActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources()' on a null object reference
Any help would be greatly appreciated-- I'm completely stumped.
Here's the part that should replace ScriptFragment with SceneFragment:
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.fragment_container2,new ScenesFragment());
transaction.addToBackStack(null);
transaction.commit();
}`
And here's SceneFragment (Minus two methods which I've tested elsewhere) :
public class ScenesFragment extends Fragment {
public List<String> results = new ArrayList<>();
public SQLiteDatabase newDB;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Add this line in order for this fragment to handle menu events.
setHasOptionsMenu(true);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragement_scenes, container, false);
listView = new ListView(null);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
}
});
return rootView;
}
Here's my MainActivity (ScriptsActivity) which adds ScriptFragment initially:
package com.alecdb.lineburner;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
public class ScriptsActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_scripts);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.fragment_container,new ScriptsFragment())
.commit();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_scripts, 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();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
Here's the Activity's XML:
<?xml version="1.0" encoding="utf-8"?>
>
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="@style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<android.support.design.widget.FloatingActionButton
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="@dimen/fab_margin"
android:src="@android:drawable/ic_dialog_email" />
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/fragment_container"
class="com.alecdb.lineburner.ScriptsFragment">
</FrameLayout>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/fragment_container2"
class="com.alecdb.lineburner.ScenesFragment">
</FrameLayout>
And SceneFragment's XML:
<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.alecdb.lineburner.ScenesFragment"
>
<ListView
android:id="@+id/listView2"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="TESTING TESTING TESTING!!!!"/>
And lastly, ScriptFragment's XML:
<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"
android:id="@+id/scripts_fragment"
tools:context="com.alecdb.lineburner.ScriptsFragment"
tools:showIn="@layout/activity_scripts">
<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</RelativeLayout>
And my Manifest:
<?xml version="1.0" encoding="utf-8"?>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".ScriptsActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<provider
android:authorities="com.alecdb.lineburner.app"
android:name="com.alecdb.lineburner.data.LineBurnerProvider"
/>
</application>
Thanks again,
Alec Burns
P.S. This is my first post on StackOverflow. Please let me know if I've done something wrong.
