Getting some errors on setActionBar()

Question

So i'm having some trouble with my code with this error i'm using androidx and i think the problem is because of dat. for being honest i don't know how to change to old version android

so the error is this

error: incompatible types: androidx.appcompat.widget.Toolbar cannot be converted to android.widget.Toolbar

I already tried to import android.support.v7.wigdet.Toolbar did not work :(

MainActivity.Java

import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;



import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Toolbar toolbar = findViewById(R.id.toolbar);
        setActionBar(toolbar);
    }

nav_header.xml

activity_main.xml

Build.gradle

Update error when run

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.readytogo, PID: 8403
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.readytogo/com.example.readytogo.MainActivity}: android.view.InflateException: Binary XML file line #26 in com.example.readytogo:layout/activity_main: Binary XML file line #26 in com.example.readytogo:layout/activity_main: Error inflating class fragment
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3260)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3396)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2009)
        at android.os.Handler.dispatchMessage(Handler.java:107)
        at android.os.Looper.loop(Looper.java:214)
        at android.app.ActivityThread.main(ActivityThread.java:7319)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:934)
     Caused by: android.view.InflateException: Binary XML file line #26 in com.example.readytogo:layout/activity_main: Binary XML file line #26 in com.example.readytogo:layout/activity_main: Error inflating class fragment
     Caused by: android.view.InflateException: Binary XML file line #26 in com.example.readytogo:layout/activity_main: Error inflating class fragment
     Caused by: java.lang.NullPointerException
        at java.lang.VMClassLoader.findLoadedClass(Native Method)
        at java.lang.ClassLoader.findLoadedClass(ClassLoader.java:738)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:363)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
        at android.app.Fragment.instantiate(Fragment.java:536)
        at android.app.FragmentContainer.instantiate(FragmentContainer.java:53)
        at android.app.FragmentManagerImpl.onCreateView(FragmentManager.java:3553)
        at android.app.FragmentController.onCreateView(FragmentController.java:104)
        at android.app.Activity.onCreateView(Activity.java:6929)
        at androidx.fragment.app.FragmentActivity.onCreateView(FragmentActivity.java:326)
        at android.view.LayoutInflater.tryCreateView(LayoutInflater.java:1069)
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:997)
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:961)
        at android.view.LayoutInflater.rInflate(LayoutInflater.java:1123)
        at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1084)
        at android.view.LayoutInflater.rInflate(LayoutInflater.java:1126)
        at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1084)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:682)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:534)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:481)
        at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:470)
        at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:141)
        at com.example.readytogo.MainActivity.onCreate(MainActivity.java:16)
        at android.app.Activity.performCreate(Activity.java:7783)
        at android.app.Activity.performCreate(Activity.java:7772)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1299)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3235)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3396)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2009)
E/AndroidRuntime:     at android.os.Handler.dispatchMessage(Handler.java:107)
        at android.os.Looper.loop(Looper.java:214)
        at android.app.ActivityThread.main(ActivityThread.java:7319)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:934)

Share your `activity_main` layout file with question – AskNilesh Jun 11 '19 at 10:08 — AskNilesh, Jun 11 '19 at 10:08
Post your .xml and Gradle dependency – Mehul Solanki Jun 11 '19 at 10:14 — Mehul Solanki, Jun 11 '19 at 10:14

score 2 · Answer 1 · answered Jun 11 '19 at 10:27

If you looking to use androidx dependency then your code must be like below

put inside your activity_main.xml

<com.google.android.material.appbar.AppBarLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/app_bar"
            android:theme="@style/AppTheme.AppBarOverlay">

            <androidx.appcompat.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" />

</com.google.android.material.appbar.AppBarLayout>

Your MainActivty.java

import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
    }
}

inside your app.gradle use androidx dependencys like below

 implementation 'androidx.appcompat:appcompat:1.1.0-alpha02'

I hope this will work for you, let me know if anything.

score 0 · Answer 2 · answered Jun 11 '19 at 10:13

0

I guess you have to use setSupportActionBar(yourToolbar) in here.

answered Jun 11 '19 at 10:13

MinnKhant

61
8

it do not give any error, only when i run the app it crashes it says Could not identify launch activity: Default Activity not found Error while Launching activity – CapitaoJarda Jun 11 '19 at 11:01
You need to add this one. ` ` in your AndroidManifest.xml between tag – MinnKhant Jun 11 '19 at 11:04
where should i add dat? – CapitaoJarda Jun 11 '19 at 11:07
Sorry I edited my comment, please look at it again. – MinnKhant Jun 11 '19 at 11:10
did not work – CapitaoJarda Jun 11 '19 at 11:18
Caused by: android.view.InflateException: Binary XML file line #26 in com.example.readytogo:layout/activity_main: Binary XML file line #26 in com.example.readytogo:layout/activity_main: Error inflating class fragment Caused by: android.view.InflateException: Binary XML file line #26 in com.example.readytogo:layout/activity_main: Error inflating class fragment Caused by: java.lang.NullPointerException – CapitaoJarda Jun 11 '19 at 11:20
i got it i just need to changed this – CapitaoJarda Jun 11 '19 at 11:37

Asad Ali Choudhry · Accepted Answer · 2019-06-11T10:32:49.520

0

Try this

import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;



import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
    }
}

As you are extending from AppComatActivity instead of Activity, so you have to use setSupportActionBar instead of setActionBar.

IN your xml Toolbar is also missing, you need to add toolbar in your activity xml like

    <androidx.appcompat.widget.Toolbar
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:titleTextAppearance="@style/ToolBarStyle" />

edited Jun 11 '19 at 10:32

answered Jun 11 '19 at 10:16

Asad Ali Choudhry

4,985
4
31
36

Hi thanks for your help, so the error gone but now i have one problem when i try to run the app on emulator it crashes – CapitaoJarda Jun 11 '19 at 10:49
Could not identify launch activity: Default Activity not found Error while Launching activity – CapitaoJarda Jun 11 '19 at 11:01
Do you have intent-filter in your Activity tag in Manifest File? – Asad Ali Choudhry Jun 11 '19 at 11:14
please share the activity xml, line 26 where it says the error present – Asad Ali Choudhry Jun 11 '19 at 11:20
this? – CapitaoJarda Jun 11 '19 at 11:23
try by changing fragment to – Asad Ali Choudhry Jun 11 '19 at 11:35

score 0 · Answer 4 · answered Jun 11 '19 at 10:23

0

Make sure in your XML you have something like this

Then you can proceed with something like this

Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);

answered Jun 11 '19 at 10:23

joash

2,205
2
26
31

i have this – CapitaoJarda Jun 11 '19 at 10:50

Getting some errors on setActionBar()

4 Answers4