Develop Reference

Android NullPointerException Toolbar.setNavigationOnClickListener null object reference

Here is error
java.lang.NullPointerException: Attempt to invoke virtual method 'void
android.support.v7.widget.Toolbar.setNavigationOnClickListener(android.view.View$
OnClickListener)' on a null object reference
it happen on
toolBar.setNavigationOnClickListener(new View.OnClickListener()
imageView.setOnClickListener(new View.OnClickListener()
bottomNavigationView.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener()
have the same problem "null object reference".
my team separate file to fragment and all action listener in MainActivity is broke down but we want to separate to fragment like this, but I can't find why separate file to fragment it will null object reference
Here XML fragment_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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"
xmlns:tools="http://schemas.android.com/tools"
android:layoutDirection="rtl"><!--set tool bar right to left set drawer to right-->
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="0dp"
android:layout_height="56dp"
android:background="#color/colorPrimary"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
tools:layout_editor_absoluteY="0dp"
app:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar" />
<ImageView
android:id="#+id/pamba_icon_id"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="0dp"
app:layout_constraintLeft_toLeftOf="#+id/toolbar"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="#drawable/pambaicon"
app:layout_constraintBottom_toBottomOf="#+id/toolbar"
android:layout_marginBottom="0dp"
app:layout_constraintVertical_bias="0.0" />
<ImageView
android:id="#+id/filter_icon_id"
android:clickable="true"
android:layout_width="25dp"
android:layout_height="25dp"
android:layout_marginBottom="8dp"
android:layout_marginRight="48dp"
android:layout_marginTop="8dp"
app:layout_constraintBottom_toBottomOf="#+id/toolbar"
app:layout_constraintRight_toRightOf="#+id/toolbar"
app:layout_constraintTop_toTopOf="#+id/toolbar"
app:srcCompat="#drawable/filter"
app:layout_constraintVertical_bias="0.533" />
<android.support.v4.view.ViewPager
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/viewPaper_id"
android:layout_below="#id/toolbar">
</android.support.v4.view.ViewPager>
<android.support.design.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.BottomNavigationView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/bottomNavigation_id"
android:layout_gravity="bottom"
android:background="?android:attr/windowBackground"
app:menu="#menu/bottom_navigation_menu"
app:theme="#style/BottomNavigationTheme"
app:itemBackground="#color/colorGray"/>
</android.support.design.widget.CoordinatorLayout>
</android.support.constraint.ConstraintLayout>
Here activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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:layoutDirection="rtl"><!--set tool bar right to left set drawer to right-->
<android.support.constraint.ConstraintLayout
android:id="#+id/contentContainer"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</android.support.constraint.ConstraintLayout>
Here MainFragment
import...
public class MainFragment extends Fragment {
public MainFragment() {
super();
}
public static MainFragment newInstance() {
MainFragment fragment = new MainFragment();
Bundle args = new Bundle();
fragment.setArguments(args);
return fragment;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
initInstances(rootView);
return rootView;
}
private void initInstances(View rootView) {
// Init 'View' instance(s) with rootView.findViewById here
}
#Override
public void onStart() {
super.onStart();
}
#Override
public void onStop() {
super.onStop();
}
/*
* Save Instance State Here
*/
#Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
// Save Instance State here
}
/*
* Restore Instance State Here
*/
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
if (savedInstanceState != null) {
// Restore Instance State here
}
}
}
and MainActivity
import...
public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener{
Toolbar toolBar;
DrawerLayout drawerLayout;
NavigationView navigationView;
ImageView imageView;
BottomNavigationView bottomNavigationView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.navigation_drawer);
setTitle(R.string.title);
drawerLayout = (DrawerLayout) findViewById(R.id.drawe_layout);
navigationView = (NavigationView) findViewById(R.id.navigation_view);
imageView = (ImageView) findViewById(R.id.filter_icon_id);
navigationView.setNavigationItemSelectedListener(this);
final ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, drawerLayout, toolBar, R.string.open_drawer, R.string.close_drawer);
drawerLayout.setDrawerListener(toggle);
toggle.syncState();
// set own toolbar
toolBar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolBar);
toolBar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (drawerLayout.isDrawerOpen(Gravity.RIGHT)) {
drawerLayout.closeDrawer(Gravity.RIGHT);
} else {
drawerLayout.openDrawer(Gravity.RIGHT);
}
}
});
imageView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(), "filter click", Toast.LENGTH_SHORT).show();
}
});
bottomNavigationView = (BottomNavigationView) findViewById(R.id.bottomNavigation_id);
// select item from bottom navigation
bottomNavigationView.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
int id = item.getItemId();
switch (id){
case R.id.firstpage_id:
Toast.makeText(getApplicationContext(), "home", Toast.LENGTH_SHORT).show();
break;
case R.id.offergape_id:
Toast.makeText(getApplicationContext(), "offer", Toast.LENGTH_SHORT).show();
break;
case R.id.needpage_id:
Toast.makeText(getApplicationContext(), "need", Toast.LENGTH_SHORT).show();
break;
case R.id.searchpage_id:
Toast.makeText(getApplicationContext(), "search", Toast.LENGTH_SHORT).show();
break;
}
return true;
}
});
}
//close drawer when click back
#Override
public void onBackPressed() {
if(drawerLayout.isDrawerOpen(GravityCompat.END)){
drawerLayout.closeDrawer(GravityCompat.END);
}else {
super.onBackPressed();
}
}
// select item from drawer
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
int id = item.getItemId();
switch (id){
case R.id.account_detail_id:
Toast.makeText(getApplicationContext(), "account", Toast.LENGTH_SHORT).show();
break;
case R.id.trip_detail_id:
Toast.makeText(getApplicationContext(), "detail", Toast.LENGTH_SHORT).show();
break;
case R.id.mail_id:
Toast.makeText(getApplicationContext(), "mail", Toast.LENGTH_SHORT).show();
break;
case R.id.logout_id:
Toast.makeText(getApplicationContext(), "logout", Toast.LENGTH_SHORT).show();
break;
}
drawerLayout.closeDrawer(GravityCompat.END);
return true;
}
}
edit add navigation_drawer.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"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/drawe_layout"
android:fitsSystemWindows="true"
tools:openDrawer="end">
<!--set drawer open from right-->
<include layout="#layout/activity_main"/>
<android.support.design.widget.NavigationView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:id="#+id/navigation_view"
android:background="#color/colorGray"
android:fitsSystemWindows="true"
app:headerLayout="#layout/navigation_header"
app:menu="#menu/navigation_menu"
app:theme="#style/NavigationDrawerStyle"
android:layout_gravity="end"/>
<!--set drawer open from right-->
</android.support.v4.widget.DrawerLayout>

Your setContentView in onCreate is setting it to R.layout.navigation_drawer. You didn't provide an example of that, but instead provided an example of R.layout.fragment_main. I'm thinking you want that one to be your layout instead. So in onCreate in your activity set your content view to that layout instead:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_main);
... // The rest of your code here
}

How to add Toolbar to PreferenceActivity

I am creating an app which have a setting PreferenceActivity with actionbar and that's working fine. I want to use another custom PreferenceActivity with actionbar which is using a layout (activity_about.xml) and preference layout (about_preferences.xml). But when i run the app it's causing my app to crash on calling that activity. Probably the actionbar is returning the Null, i can't figure it out where is the problem. Please help.
My ActivityAbout.java
public class ActivityAbout extends PreferenceActivity {
private AppCompatDelegate mDelegate;
private ActionBar actionBar;
private SharedPref sharedPref;
private View parent_view;
private TextView ver;
Context context=this;
#Override
protected void onCreate(Bundle savedInstanceState) {
getDelegate().installViewFactory();
getDelegate().onCreate(savedInstanceState);
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.about_preferences);
setContentView(R.layout.activity_about);
View lv = findViewById(android.R.id.list);
if (lv != null) lv.setPadding(0, 0, 0, 0);
final Preference prefPrivacy = (Preference) findPreference(getString(R.string.pref_title_privacy));
final Preference prefTerm = (Preference) findPreference(getString(R.string.pref_title_term));
final Preference prefBuild = (Preference) findPreference(getString(R.string.pref_title_build));
final Preference prefCopyright = (Preference) findPreference(getString(R.string.pref_title_copyright));
String versionName = BuildConfig.VERSION_NAME;
ver = (TextView) findViewById(R.id.version);
ver.setText("Version "+versionName);
prefBuild.setSummary("Version "+versionName);
int y = Calendar.getInstance().get(Calendar.YEAR);
prefCopyright.setSummary("Copyright © "+y+" Get Rid Remedy.\nAll Right Reserved.");
prefPrivacy.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
#Override
public boolean onPreferenceClick(Preference preference) {
dialogPrivacy(ActivityAbout.this);
return false;
}
});
prefTerm.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
#Override
public boolean onPreferenceClick(Preference preference) {
dialogTerm(ActivityAbout.this);
return false;
}
});
initToolbar();
}
public void dialogPrivacy(Activity activity) {
AlertDialog.Builder builder = new AlertDialog.Builder(activity);
builder.setTitle(activity.getString(R.string.pref_title_privacy));
builder.setMessage(activity.getString(R.string.content_privacy));
builder.setPositiveButton("OK", null);
builder.show();
}
public void dialogTerm(Activity activity) {
AlertDialog.Builder builder = new AlertDialog.Builder(activity);
builder.setTitle(activity.getString(R.string.pref_title_term));
builder.setMessage(activity.getString(R.string.content_term));
builder.setPositiveButton("OK", null);
builder.show();
}
#Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
getDelegate().onPostCreate(savedInstanceState);
}
private void initToolbar() {
actionBar = getSupportActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);
actionBar.setHomeButtonEnabled(true);
actionBar.setTitle(R.string.activity_title_settings);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == android.R.id.home) {
onBackPressed();
}
return super.onOptionsItemSelected(item);
}
public ActionBar getSupportActionBar() {
return getDelegate().getSupportActionBar();
}
public void setSupportActionBar(#Nullable Toolbar toolbar) {
getDelegate().setSupportActionBar(toolbar);
}
#Override
public MenuInflater getMenuInflater() {
return getDelegate().getMenuInflater();
}
#Override
public void setContentView(#LayoutRes int layoutResID) {
getDelegate().setContentView(layoutResID);
}
#Override
public void setContentView(View view) {
getDelegate().setContentView(view);
}
#Override
public void setContentView(View view, ViewGroup.LayoutParams params) {
getDelegate().setContentView(view, params);
}
#Override
public void addContentView(View view, ViewGroup.LayoutParams params) {
getDelegate().addContentView(view, params);
}
#Override
protected void onPostResume() {
super.onPostResume();
getDelegate().onPostResume();
}
#Override
protected void onTitleChanged(CharSequence title, int color) {
super.onTitleChanged(title, color);
getDelegate().setTitle(title);
}
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
getDelegate().onConfigurationChanged(newConfig);
}
#Override
protected void onStop() {
super.onStop();
getDelegate().onStop();
}
#Override
protected void onDestroy() {
super.onDestroy();
getDelegate().onDestroy();
}
public void invalidateOptionsMenu() {
getDelegate().invalidateOptionsMenu();
}
private AppCompatDelegate getDelegate() {
if (mDelegate == null) {
mDelegate = AppCompatDelegate.create(this, null);
}
return mDelegate;
}
}
Here is the about_preferences layout.
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<Preference
android:key="#string/pref_title_dev_email"
android:summary="#string/developer_email"
android:title="#string/pref_title_dev_email"/>
<Preference
android:key="#string/pref_title_copyright"
android:summary="#string/copyright"
android:title="#string/pref_title_copyright"/>
<Preference
android:key="#string/pref_title_build"
android:summary="#string/app_version"
android:title="#string/pref_title_build"/>
<Preference
android:key="#string/pref_title_privacy"
android:title="#string/pref_title_privacy"
android:widgetLayout="#layout/ic_about"/>
<Preference
android:key="#string/pref_title_term"
android:title="#string/pref_title_term"
android:widgetLayout="#layout/ic_about"/>
Here is activity_about.
<?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:id="#+id/activity_about"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.overridecode.getridremedy.ActivityAbout">
<android.support.design.widget.AppBarLayout
android:id="#+id/tool"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay">
<include layout="#layout/toolbar" />
</android.support.design.widget.AppBarLayout>
<LinearLayout
android:layout_below="#+id/tool"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="#dimen/activity_vertical_margin">
<ImageView
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_gravity="center"
app:srcCompat="#mipmap/ic_launcher"
android:id="#+id/imageView" />
<TextView
android:text="#string/app_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:layout_marginTop="10dp"
android:textSize="30dp"
android:textStyle="bold"
android:textColor="#73000000"
android:id="#+id/app_title" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:id="#+id/version" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_alignParentBottom="true">
<ListView android:id="#android:id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
</LinearLayout>
The error i am getting:
java.lang.RuntimeException: Unable to start activity
ComponentInfo{com.overridecode.getridremedy/
com.overridecode.getridremedy.ActivityAbout}:
java.lang.NullPointerException: Attempt to invoke virtual method 'void
android.support.v7.app.ActionBar.setDisplayHomeAsUpEnabled(boolean)' on a null object reference

Add an ID to your Toolbar:
<include
android:id="#+id/toolbar_prefs"
layout="#layout/toolbar" />
And call setSupportActionBar() (passing your Toolbar instance) before calling getSupportActionBar():
private void initToolbar() {
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar_prefs);
setSupportActionBar(toolbar);
actionBar = getSupportActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);
actionBar.setHomeButtonEnabled(true);
actionBar.setTitle(R.string.activity_title_settings);
}
Otherwise getSupportActionBar() will return null.

As per my experience, I found there is no ActionBar in preference activity. So,
There are following steps to add toolbar in your activity
Add in xml
<include layout="#layout/toolbar" />
Set Toolbar in java class using following code.
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbarId);
setSupportActionBar(toolbar);
NOTE: here you need to use this code in starting of intitToolbar() method.
Import proper class/package for your toolbar. From your comments seems you need to import
import android.support.v7.widget.Toolbar;
Hope this may help you. If helps, please approve it as right answer.

ViewPager + TabLayout with NavigationDrawer in every Activity - Issue

I encountered a problem that I didn't managed to solve: I have a MainActivity where there's a NavigationDrawer that allows me to go to three different activities. Those extend the MainActivity so I get the Drawer in every activity.
In the same MainActivity, I put a TabLayout with three tab Fragments.
The problem I'm facing is that whenever I go to one of the three activity from the drawer layout, I don't get the layout xml attached to Activity1 but instead I get again the TabLayout with the Fragments.
How can I solve this?
The result should look like Google Play app.
Here's my MainActivity:
public class MainActivity extends AppCompatActivity {
DrawerLayout mDrawerLayout;
ListView mDrawerList;
ActionBarDrawerToggle mDrawerToggle;
CollectionPagerAdapter mCollectionPagerAdapter;
ViewPager mViewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar_layout);
TextView mTitle = (TextView) toolbar.findViewById(R.id.toolbar_title);
mTitle.setText(R.string.app_name);
setSupportActionBar(toolbar);
assert getSupportActionBar() != null;
this.getSupportActionBar().setDisplayShowTitleEnabled(false);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer);
Button button1 = (Button)findViewById(R.id.button1); //this is inside the drawer layout
button1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, Activity1.class);
startActivity(intent);
}
});
mDrawerToggle = new ActionBarDrawerToggle(this,
mDrawerLayout,
null,
R.string.drawer_open,
R.string.drawer_close) {
public void onDrawerClosed(View v) {
super.onDrawerClosed(v);
invalidateOptionsMenu();
syncState();
}
public void onDrawerOpened(View v) {
super.onDrawerOpened(v);
invalidateOptionsMenu();
syncState();
}
};
mDrawerLayout.addDrawerListener(mDrawerToggle);
mDrawerToggle.setDrawerIndicatorEnabled(false);
mDrawerToggle.syncState();
mCollectionPagerAdapter = new CollectionPagerAdapter(
getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mCollectionPagerAdapter);
TabLayout tabs = (TabLayout)findViewById(R.id.tabs);
tabs.setupWithViewPager(mViewPager);
}
public class CollectionPagerAdapter extends FragmentPagerAdapter {
//final int NUM_ITEMS = 3; // number of tabs
public CollectionPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position)
{
switch (position) {
case 0:
return new Tab1();
case 1:
return new Tab2();
case 2:
return new Tab3();
}
return null;
}
#Override
public int getCount()
{
return 3;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position)
{
case 0:
return getString(R.string.tab1);
case 1:
return getString(R.string.tab2);
case 2:
return getString(R.string.tab3);
}
return null;
}
}
#Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
mDrawerToggle.syncState();
}
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
mDrawerToggle.onConfigurationChanged(newConfig);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home: {
if (mDrawerLayout.isDrawerOpen(mDrawerList)) {
mDrawerLayout.closeDrawer(mDrawerList);
} else {
mDrawerLayout.openDrawer(mDrawerList);
}
return true;
}
default:
return super.onOptionsItemSelected(item);
}
}
Activity1:
public class Activity1 extends MainActivity { //extends MainActivity
#Override
protected void onCreate(Bundle savedInstanceState) {
setContentView(R.layout.classe1); //setContentView before super.onCreate(savedInstanceState) allows me to get drawer in each activity
super.onCreate(savedInstanceState);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar_layout);
TextView mTitle = (TextView) toolbar.findViewById(R.id.toolbar_title);
mTitle.setText("Activity 1");
setSupportActionBar(toolbar);
assert getSupportActionBar() != null;
this.getSupportActionBar().setDisplayShowTitleEnabled(false);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
}
Tab1 (Fragment):
public class Tab1 extends Fragment {
View view;
public Tab1() {
}
#SuppressLint("InflateParams")
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
view = inflater.inflate(R.layout.tab1, null);
return view;
}
and my activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
android:layout_height="match_parent"
android:layout_width="match_parent">
<android.support.v4.view.ViewPager
android:layout_height="match_parent"
android:layout_width="match_parent"
android:layout_marginBottom="60dp"
android:id="#+id/pager">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="none"
android:overScrollMode="never">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
android:orientation="vertical">
</LinearLayout>
</ScrollView>
</android.support.v4.view.ViewPager>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:gravity="bottom">
<android.support.design.widget.TabLayout
android:layout_width="match_parent"
android:layout_height="30dp"
android:id="#+id/tabs"
app:tabMode="scrollable"
app:tabSelectedTextColor="#color/colorPrimaryDark"
app:tabTextColor="#color/tab_text"
app:tabIndicatorColor="#android:color/transparent"
app:tabBackground="#drawable/selected_tab_color"
style="#style/MyCustomTabLayout"/>
<include layout="#layout/toolbar" android:id="#+id/toolbar_layout"/>
</LinearLayout>
</RelativeLayout>
<LinearLayout
android:id="#+id/linearLayout"
android:layout_width="304dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:clickable="true"
android:background="#ffffff">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="none">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/uno"
android:text="Button to Activity1"/>
</LinearLayout>
</ScrollView>
</LinearLayout>
classe1.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="match_parent"
android:layout_width="match_parent">
<FrameLayout
android:layout_height="match_parent"
android:layout_width="match_parent"
android:layout_marginBottom="30dp"
android:id="#+id/content_frame">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="none"
android:overScrollMode="never">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="CLASSE 1"
android:textSize="35sp"
android:gravity="center"/>
</LinearLayout>
</ScrollView>
</FrameLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="bottom">
<include layout="#layout/toolbar" android:id="#+id/toolbar_layout"/>
</RelativeLayout>
</RelativeLayout>

Your problem is that the super.onCreate() call in Activity1 is calling setContentView() again in MainActivity, which is completely replacing Activity1's layout set with its call to setContentView().
Since you want tabs in MainActivity but not the other Activities, your other Activities shouldn't extend MainActivity. Instead, you should create a base Activity with the DrawerLayout that all of your Activities extend, including MainActivity, and then add whichever Views you need in the individual subclasses.
In the base Activity, we'll override the setContentView() method to first set the base layout, setup the drawer and toggle, and then inflate the subclass's layout into the DrawerLayout's content View. Note that we do not call setContentView() in the base Activity's onCreate() method.
public abstract class BaseActivity extends AppCompatActivity {
protected Toolbar toolbar;
protected DrawerLayout mDrawerLayout;
protected ActionBarDrawerToggle mDrawerToggle;
protected TextView mTitle;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
...
}
#Override
public void setContentView(int layoutResID) {
super.setContentView(R.layout.activity_base);
toolbar = (Toolbar) findViewById(R.id.toolbar_layout);
mTitle = (TextView) toolbar.findViewById(R.id.toolbar_title);
mTitle.setText(R.string.app_name);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayShowTitleEnabled(false);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
//this is inside the drawer layout
Button button1 = (Button)findViewById(R.id.button1);
button1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(BaseActivity.this, Activity1.class);
startActivity(intent);
}
});
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerToggle = new ActionBarDrawerToggle(this,
mDrawerLayout,
null,
R.string.drawer_open,
R.string.drawer_close) {
public void onDrawerClosed(View v) {
super.onDrawerClosed(v);
invalidateOptionsMenu();
syncState();
}
public void onDrawerOpened(View v) {
super.onDrawerOpened(v);
invalidateOptionsMenu();
syncState();
}
};
mDrawerLayout.addDrawerListener(mDrawerToggle);
mDrawerToggle.setDrawerIndicatorEnabled(false);
mDrawerToggle.syncState();
getLayoutInflater().inflate(layoutResID,
(ViewGroup) findViewById(R.id.content));
}
}
The base layout is pretty much the same, except everything specific to MainActivity is removed.
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<FrameLayout android:id="#+id/content"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />
<include layout="#layout/toolbar" android:id="#+id/toolbar_layout"/>
</LinearLayout>
<LinearLayout
android:id="#+id/linearLayout"
android:layout_width="304dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:clickable="true"
android:background="#ffffff">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="none">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/button1"
android:text="Button to Activity1"/>
</LinearLayout>
</ScrollView>
</LinearLayout>
</android.support.v4.widget.DrawerLayout>
In MainActivity, we no longer need to setup the drawer and toggle.
public class MainActivity extends BaseActivity {
private CollectionPagerAdapter mCollectionPagerAdapter;
private ViewPager mViewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mCollectionPagerAdapter = new CollectionPagerAdapter(
getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mCollectionPagerAdapter);
TabLayout tabs = (TabLayout)findViewById(R.id.tabs);
tabs.setupWithViewPager(mViewPager);
}
...
}
And the layout for MainActivity is now basically just the ViewPager and TabLayout.
<LinearLayout 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"
android:orientation="vertical">
<android.support.v4.view.ViewPager
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:id="#+id/pager">
...
</android.support.v4.view.ViewPager>
<android.support.design.widget.TabLayout
android:layout_width="match_parent"
android:layout_height="30dp"
android:id="#+id/tabs"
app:tabMode="scrollable"
app:tabSelectedTextColor="#color/colorPrimaryDark"
app:tabTextColor="#color/tab_text"
app:tabIndicatorColor="#android:color/transparent"
app:tabBackground="#drawable/selected_tab_color"
style="#style/MyCustomTabLayout" />
</LinearLayout>
Then, to accomplish everything in Activity1 that your posted code is doing, all we need is this, since the Toolbar and title TextView are now in BaseActivity.:
public class Activity1 extends BaseActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.classe1);
mTitle.setText("Activity 1");
}
}
And the layout for Activity1 can be pared down significantly:
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="none"
android:overScrollMode="never">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="CLASSE 1"
android:textSize="35sp"
android:gravity="center"/>
</LinearLayout>
</ScrollView>

You call setContentView two times in the Activity1 onCreate method, the first time with R.layout.classe1 and the second time with R.layout.activity_main (when you call the super.onCreate). The last setContentView wins, your problem is here.

Layout displaying ImageView at the bottom of the page

Im using a collapsing toolbar/scrollview in my activity. but my image (.jpg) always displays at the bottom of the page but i want it under the collapsing toolbar.
i have tried the following:
setting the gravity = top, match_parent, fill_parent, android:layout_below, changing the appbarlayout height but none have solved the problem stated.
heres a screenshot:
night_rui.xml
<tools:android.support.design.widget.CoordinatorLayout 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"
tools:context="learn.navdrawbase.Rui">
<android.support.design.widget.AppBarLayout
android:id="#+id/MyAp"
android:layout_width="match_parent"
android:layout_height="56dp"
android:fitsSystemWindows="true"
android:theme="#style/AppTheme.AppBarOverlay"
android:layout_below="#+id/dhotelz">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/collapse_toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/evebg">
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/dhotelz"
android:layout_above="#id/MyAp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="top"
android:src="#drawable/dhoteldesc"/>
</RelativeLayout>
</ScrollView>
</tools:android.support.design.widget.CoordinatorLayout>
Rui.java
package learn.navdrawbase;
import android.app.Activity;
import android.os.Bundle;
/**
* Created by User on 2/4/2016.
*/
public class Rui extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.night_rui);
}
}
BaseActivity.java if needed:
public abstract class BaseActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
private Toolbar mActionBarToolbar;
private DrawerLayout mDrawerLayout;
protected NavigationView mNavigationView;
private ActionBarDrawerToggle mToggle;
/**
* Helper method that can be used by child classes to
* specify that they don't want a {#link Toolbar}
* #return true
*/
protected boolean useToolbar() {
return true;
}
/**
* Helper method to allow child classes to opt-out of having the
* hamburger menu.
* #return
*/
protected boolean useDrawerToggle() {
return true;
}
#Override
public void setContentView(int layoutResID) {
super.setContentView(layoutResID);
getActionBarToolbar();
setupNavDrawer();
}//end setContentView
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//Global methods as
/*
mImageLoader = new ImageLoader(this);
mHandler = new Handler();
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
sp.registerOnSharedPreferenceChangeListener(this);
...
*/
}
protected Toolbar getActionBarToolbar() {
if (mActionBarToolbar == null) {
mActionBarToolbar = (Toolbar) findViewById(R.id.toolbar);
if (mActionBarToolbar != null) {
// Depending on which version of Android you are on the Toolbar or the ActionBar may be
// active so the a11y description is set here.
mActionBarToolbar.setNavigationContentDescription(getResources()
.getString(R.string.navdrawer_description_a11y));
//setSupportActionBar(mActionBarToolbar);
if (useToolbar()) { setSupportActionBar(mActionBarToolbar);
} else { mActionBarToolbar.setVisibility(View.GONE); }
}
}
return mActionBarToolbar;
}
private void setupNavDrawer() {
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
if (mDrawerLayout == null) {
return;
}
// use the hamburger menu
if( useDrawerToggle()) {
mToggle = new ActionBarDrawerToggle(
this, mDrawerLayout, mActionBarToolbar,
R.string.navigation_drawer_open,
R.string.navigation_drawer_close);
mDrawerLayout.setDrawerListener(mToggle);
mToggle.syncState();
}
else if(useToolbar() && getSupportActionBar() != null) {
// Use home/back button instead
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeAsUpIndicator(ContextCompat
.getDrawable(this, R.drawable.abc_ic_ab_back_mtrl_am_alpha));
}
mNavigationView = (NavigationView) findViewById(R.id.nav_view);
mNavigationView.setNavigationItemSelectedListener(this);
}
#Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
switch (id) {
case R.id.nav_1:
createBackStack(new Intent(this, MyHome.class));
break;
case R.id.nav_2:
createBackStack(new Intent(this, MyTour.class));
break;
case R.id.nav_3:
createBackStack(new Intent(this, MyTranslator.class));
break;
case R.id.nav_4:
createBackStack(new Intent(this, MySettings.class));
break;
case R.id.nav_5:
createBackStack(new Intent(this, MyAbout.class));
break;
}
closeNavDrawer();
overridePendingTransition(R.anim.enter_from_left, R.anim.exit_out_left);
return true;
}
protected boolean isNavDrawerOpen() {
return mDrawerLayout != null && mDrawerLayout.isDrawerOpen(GravityCompat.START);
}
protected void closeNavDrawer() {
if (mDrawerLayout != null) {
mDrawerLayout.closeDrawer(GravityCompat.START);
}
}
/**
* Enables back navigation for activities that are launched from the NavBar. See
* {#code AndroidManifest.xml} to find out the parent activity names for each activity.
* #param intent
*/
private void createBackStack(Intent intent) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
TaskStackBuilder builder = TaskStackBuilder.create(this);
builder.addNextIntentWithParentStack(intent);
builder.startActivities();
} else {
startActivity(intent);
finish();
}
}
}//end BaseActivity

Try to change your AppBarLayout height.

Add theme in your AppBarLayout.
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="256dp"
android:fitsSystemWindows="true"
android:theme="#style/AppTheme.AppBarOverlay">
So you need to use theme:
android:theme="#style/AppTheme.AppBarOverlay"
It's the code and works for me :
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
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:fitsSystemWindows="true"
tools:context="eb.collapsetoolbarlayout.MainActivity">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="256dp"
android:fitsSystemWindows="true"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/collapse_toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
android:fitsSystemWindows="true">
<ImageView
android:id="#+id/bgheader"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop"
android:fitsSystemWindows="true"
android:background="#drawable/wallpaper2"
app:layout_collapseMode="pin" />
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="parallax"
app:popupTheme="#style/AppTheme.PopupOverlay" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
</android.support.design.widget.CoordinatorLayout>

android weird error at the beginning

package com.example.medapp;
public class MainActivity extends Activity {
public final static String apts = "com.example.medapp.editapts";
static final int PICK_DATE_REQUEST = 1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void open(View view) {
// Do something in response to button
DatePicker dp = (DatePicker)findViewById(R.id.datePicker1);
int date = dp.getYear() + dp.getMonth() + dp.getDayOfMonth();
//load DATABASE
//start showing the list
final ListView listview = (ListView) findViewById(R.id.listView1);
String[] values = new String[] { "apt1", "apt2", "apt3",
"apt4", "apt5", "apt6", "apt7", "apt8" };
final ArrayList<String> list = new ArrayList<String>();
for (int i = 0; i < values.length; ++i) {
list.add(values[i]);
}
final StableArrayAdapter adapter = new StableArrayAdapter(this,
android.R.layout.simple_list_item_1, list);
listview.setAdapter(adapter);
listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, final View view,
int position, long id) {
final String item = (String) parent.getItemAtPosition(position);
view.animate().setDuration(2000).alpha(0)
.withEndAction(new Runnable() {
#Override
public void run() {
Intent intent = new Intent(view.getContext(),editapts.class);
intent.putExtra(apts,item);
adapter.notifyDataSetChanged();
view.setAlpha(1);
startActivity(intent);
}
});
}
});
}
#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;
}
Hi there
I have some weird problem about my code
it says
Multiple markers at this line
- button1 cannot be resolved
- overrides
android.app.Activity.onCreate
on code
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
which was totally fine before (button1 is the trigger which do the acts)
the error part was provided when the file created
any tip please? android noob here :s
Thank you :)
I already did clean and rebuild everything and still not working :(
<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=".MainActivity" >
<DatePicker
android:id="#+id/datePicker1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="#+id/textView1"
android:layout_marginTop="19dp" />
<ListView
android:id="#+id/listView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/datePicker1"
android:layout_below="#+id/button1"
android:layout_marginTop="20dp" >
</ListView>
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/datePicker1"
android:layout_alignParentTop="true"
android:layout_marginTop="34dp"
android:text="Appointments" />
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/datePicker1"
android:layout_alignBottom="#+id/datePicker1"
android:layout_alignRight="#+id/listView1"
android:layout_marginRight="36dp"
android:onClick="open"
android:text="Open" />
</RelativeLayout>

Remove
android:onClick="open"
from your Xml . And try this into your OnCreate method
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button1 = (Button)findViewById(R.id.button1);
button1.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v)
{
// do whatever you are doing in open method
}
}
}
Basically your code and this edit is same , but certainly something wrong going on. Hope it helps.