I decided to use fragments as an alternative to activities, so I cut up my activity_main.xml into 2 different XML files: activity_main.xml and fragment_main.xml. The problem is that the relativeLayout previously in activity_main that I was referencing in java is no longer working after I moved it to the other XML file. It looks like you need to set the content view of whatever XML file you're using in order to findViewByID, but filling in my graph with barchart data might require both; the fragment_main.xml needing to be set as my content view (it's the blank that I'm filling in with other fragments) and the activity_main needing to be set to display it as a part of my main screen. The fSetGraph(); is using this graph: https://github.com/PhilJay/MPAndroidChart
Out of curiousity: do layout inflaters come into play anywhere in here?
MainActivity.java
public class MainActivity extends AppCompatActivity {
private DrawerLayout mDrawer;
private Toolbar toolbar;
private RecyclerView recyclerView;
private NavigationView nvDrawer;
FloatingActionButton fab;
FragmentManager manager = getSupportFragmentManager();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_main);
fSetGraph();
fsetFAB();
// setContentView(R.layout.activity_main);
// fSetToolBar();
// fSetDrawer();
// fSetDrawerContent();
// fsetInitialFragment();
}
private void fSetGraph() {
.
. //Lots of code here about setting the graph. Not important.
.
RelativeLayout rl = (RelativeLayout) findViewById(R.id.relativeLayoutForChart);
rl.addView(MainActivity.barChartGlobal,
new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.MATCH_PARENT));
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:id="@+id/linearLayoutMainActivity"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<!-- The ActionBar -->
<include
layout="@layout/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/relativeLayoutActivity"
android:paddingTop="@dimen/activity_vertical_margin"
android:background="#FFFFFF">
<!--Fragments placed here-->
</RelativeLayout>
</LinearLayout>
<!-- The navigation drawer -->
<android.support.design.widget.NavigationView
android:id="@+id/nvView"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:background="@android:color/white"
app:menu="@menu/drawer_view"
app:headerLayout="@layout/drawer_header">
<!--<include-->
<!--layout="@layout/drawer_header"-->
<!--android:layout_width="match_parent"-->
<!--android:layout_height="160dp"/>-->
</android.support.design.widget.NavigationView>
</android.support.v4.widget.DrawerLayout>
fragment_main.xml
<?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"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!-- Here on down is the fragment I'm using in activity_main.xml-->
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="false"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:id="@+id/relativeLayoutForChart"
android:layout_above="@+id/linearLayoutForCenterReference"
android:layout_below="@+id/linearLayoutHeader">
<com.github.mikephil.charting.charts.BarChart
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/chart"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_gravity="center"
android:layout_alignParentBottom="true"
android:layout_alignParentTop="false" />
</RelativeLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="2dp"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:id="@+id/linearLayoutForCenterReference">
</LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/linearLayoutLabels"
android:gravity="center_vertical|center_horizontal"
android:layout_alignTop="@+id/linearLayoutForCenterReference"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="false"
android:layout_centerHorizontal="true"
android:layout_toRightOf="@+id/relativeLayoutSchedule"
android:layout_alignParentStart="true"
android:layout_alignParentLeft="true">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="tv1"
android:id="@+id/textView1"
android:textSize="15dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="tv2"
android:id="@+id/textView2"
android:textSize="15dp"
android:layout_marginLeft="52dp"
android:layout_marginRight="52dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="tv3"
android:id="@+id/textView3"
android:textSize="15dp" />
</LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:id="@+id/linearLayoutHeader"
android:layout_alignParentEnd="true"
android:layout_alignParentStart="true"
android:gravity="center_horizontal">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="One"
android:id="@+id/textViewOne"
android:layout_alignParentTop="true"
android:layout_toLeftOf="@+id/textViewState"
android:layout_toStartOf="@+id/textViewState" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Two"
android:id="@+id/textViewTwo"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginLeft="50dp"
android:layout_marginRight="40dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Three"
android:id="@+id/textViewThree"
android:layout_alignParentTop="true"
android:layout_toRightOf="@+id/textViewState"
android:layout_toEndOf="@+id/textViewState" />
</RelativeLayout>
</LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/linearLayoutLabels"
android:layout_centerHorizontal="true"
android:id="@+id/linearLayoutActivityFeed"
android:gravity="center_vertical|center_horizontal"
android:paddingTop="0dp"
android:layout_marginTop="10dp"
android:layout_marginBottom="3dp">
<ImageView
android:layout_width="32dp"
android:layout_height="32dp"
android:id="@+id/imageView2"
android:src="@drawable/ic_assignment_black_24dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Activity Feed"
android:id="@+id/textViewActivityFeed"
android:layout_marginBottom="1dp" />
</LinearLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/linearLayoutActivityFeed"
android:layout_centerHorizontal="true"
android:id="@+id/relativeLayoutForTabs">
<android.support.design.widget.AppBarLayout
android:id="@+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
android:gravity="right">
<android.support.design.widget.TabLayout
android:id="@+id/sliding_tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_scrollFlags="scroll|enterAlways"/>
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="0px"
android:layout_weight="1"
android:background="@android:color/white">
</android.support.v4.view.ViewPager>
</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:src="@drawable/ic_add_black_24dp"
android:layout_marginBottom="20dp"
android:layout_marginRight="20dp"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"/>
<android.support.v7.widget.RecyclerView
android:id="@+id/drawer_recyclerView"
android:layout_width="match_parent"
android:layout_gravity="start"
android:layout_height="match_parent"
android:background="#FFFFFF">
</android.support.v7.widget.RecyclerView>
</RelativeLayout>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/linearLayoutForCenterReference"
android:layout_above="@+id/linearLayoutActivityFeed"
android:layout_alignParentStart="false"
android:layout_alignParentEnd="false"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="false"
android:id="@+id/relativeLayoutSchedule"
android:layout_alignParentTop="false"
android:gravity="center_vertical"
android:layout_alignTop="@+id/linearLayoutLabels"
android:layout_marginLeft="15dp">
<ImageView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:id="@+id/imageViewSchedule"
android:src="@drawable/ic_event_black_24dp"
android:contentDescription="Event Icon" />
</RelativeLayout>
</RelativeLayout>
Trying to run that ending part of fSetGraph() with the contentView set to activity_main instead of fragment_main (which the graph is in) gives me the error:
java.lang.RuntimeException: Unable to start activity ComponentInfo{...MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.RelativeLayout.addView(android.view.View, android.view.ViewGroup$LayoutParams)' on a null object reference
Nav Drawer code
switch (menuItem.getItemId()) {
case R.id.navigation_item_log_in:
DialogPopupSignInFragment alertDialogSignInCustom = new DialogPopupSignInFragment();
alertDialogSignInCustom.show(manager, "DialogSignIn");
break;
case R.id.navigation_item_home:
FragmentMain fragmentMain = new FragmentMain();
FragmentTransaction transaction = manager.beginTransaction();
transaction.replace(R.id.relativeLayoutActivity, fragmentMain, "Home");
transaction.commit();
setTitle("App Home");
break;
case R.id.my_stats:
FragmentMyStats fragmentMyStats = new FragmentMyStats();
FragmentTransaction transactionMyStats = manager.beginTransaction();
transactionMyStats.replace(R.id.relativeLayoutActivity, fragmentMyStats , "MyStats");
transactionMyStats.commit();
setTitle("My Stats");
break;
case R.id.navigation_item_winners:
FragmentWinners fragmentWinners = new FragmentWinners();
FragmentTransaction transactionWinners = manager.beginTransaction();
transactionWinners.replace(R.id.relativeLayoutActivity, fragmentWinners, "Winners");
transactionWinners.commit();
setTitle("Winners");
break;
case R.id.navigation_item_settings:
FragmentSettings fragmentSettings = new FragmentSettings();
FragmentTransaction transactionSettings = manager.beginTransaction();
transactionSettings.replace(R.id.relativeLayoutActivity, fragmentSettings, "Settings");
transactionSettings.commit();
setTitle("Settings");
break;
case R.id.navigation_item_about:
FragmentAbout fragmentAbout = new FragmentAbout();
FragmentTransaction transactionAbout = manager.beginTransaction();
transactionAbout.replace(R.id.relativeLayoutActivity, fragmentAbout, "About");
transactionAbout.commit();
setTitle("About");
break;
}
Setting up my Drawer in MainActivity
private void fSetDrawer() {
mDrawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle drawerToggle = new ActionBarDrawerToggle(this, mDrawer, toolbar, R.string.app_name, R.string.app_name);
mDrawer.setDrawerListener(drawerToggle);
drawerToggle.syncState();
}
Navigation Drawer XML from activity_main
<android.support.design.widget.NavigationView
android:id="@+id/nvView"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:background="@android:color/white"
app:menu="@menu/drawer_view"
app:headerLayout="@layout/drawer_header">
<!--<include-->
<!--layout="@layout/drawer_header"-->
<!--android:layout_width="match_parent"-->
<!--android:layout_height="160dp"/>-->
</android.support.design.widget.NavigationView>
Navigation Drawer Menu
<group
android:checkableBehavior="single">
<item
android:id="@+id/navigation_item_log_in"
android:icon="@drawable/ic_person_black_24dp"
android:title="Log In">
</item>
<item
android:id="@+id/navigation_item_home"
android:icon="@drawable/ic_home_black_24dp"
android:title="Home">
</item>
<item
android:id="@+id/my_stats"
android:icon="@drawable/ic_developer_board_black_24dp"
android:title="My Stats">
</item>
<item
android:id="@+id/navigation_item_winners"
android:icon="@drawable/ic_wb_iridescent_black_24dp"
android:title="Winners">
</item>
<item
android:id="@+id/navigation_item_settings"
android:icon="@drawable/ic_settings_black_24dp"
android:title="Settings">
</item>
<item
android:id="@+id/navigation_item_about"
android:icon="@drawable/ic_local_library_black_24dp"
android:title="About">
</item>
<!--Recycler View-->
</group>
