android studio my helloWorld project has stopped

Question

I just instilled Android Studio and when I run the sample project hello world in the emulator it gives me my project has stopped and it doesn't work

myActivity.java

    package b3du.im.myapplication;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;


public class MyActivity extends ActionBarActivity {

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

    }
}

activity_my.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:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context=".MyActivity">

    <TextView
        android:text="@string/hello_world"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</RelativeLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="b3du.im.myapplication" >

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MyActivity"
            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 error

08-01 05:13:56.557    1884-1884/b3du.im.myapplication I/Process﹕ Sending signal. PID: 1884 SIG: 9
08-01 05:21:26.244    1944-1944/b3du.im.myapplication D/AndroidRuntime﹕ Shutting down VM
08-01 05:21:26.244    1944-1944/b3du.im.myapplication W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0xb2cc9b20)
08-01 05:21:26.284    1944-1944/b3du.im.myapplication E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: b3du.im.myapplication, PID: 1944
    java.lang.RuntimeException: Unable to start activity ComponentInfo{b3du.im.myapplication/b3du.im.myapplication.MyActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
            at android.app.ActivityThread.access$800(ActivityThread.java:135)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5017)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
            at android.support.v7.app.ActionBarActivityDelegate.onCreate(ActionBarActivityDelegate.java:108)
            at android.support.v7.app.ActionBarActivityDelegateICS.onCreate(ActionBarActivityDelegateICS.java:57)
            at android.support.v7.app.ActionBarActivity.onCreate(ActionBarActivity.java:98)
            at b3du.im.myapplication.MyActivity.onCreate(MyActivity.java:11)
            at android.app.Activity.performCreate(Activity.java:5231)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
            at android.app.ActivityThread.access$800(ActivityThread.java:135)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5017)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
            at dalvik.system.NativeStart.main(Native Method)

in my case it shows error when I modify `build.gradle` file. after restore `build.gradle`, it can run normally. — yu yang Jian, Dec 14 '21 at 15:52

score 1 · Accepted Answer · edited May 23 '17 at 12:34

1

This is because you are using ActionBarActivity, which requires the AppCompat theme to be applied.

Either use that theme, Or use simple Activity. See a similar issue

edited May 23 '17 at 12:34

Community

1
1

answered Aug 01 '14 at 10:12

MysticMagicϡ

28,593
16
73
124

1

thank you my project works now . I would like to know what is the point using ActionBarActivity instead of Activity – Aug 01 '14 at 10:16
Glad it helped @b3du Please accept answer if the issue is solved. So question gets removed from unanswered question. – MysticMagicϡ Aug 01 '14 at 10:19
@b3du [see here](http://developer.android.com/reference/android/support/v7/app/ActionBarActivity.html) for difference. I think it adds it directly in updated SDK. – MysticMagicϡ Aug 01 '14 at 10:23

score 0 · Answer 2 · answered Aug 01 '14 at 10:16

0

as Stated by MysticMagic change ActionBarActivity to Activity or change your theme to AppCompat explore package got to res-> values->style.xml and change style

<style name="AppBaseTheme" parent="Theme.AppCompat.Light">

answered Aug 01 '14 at 10:16

jaimin

563
8
25

score 0 · Answer 3 · edited May 23 '17 at 10:33

Your issue is with AppTheme that you have set currently in you app.

Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity. at android.support.v7.app.ActionBarActivityDelegate.onCreate(ActionBarActivityDelegate.java:108)

You are inheriting you from ActionBarActivity so you have to use Theme.AppCompat for your application. Change app base theme in styles.xml to

<style name="AppBaseTheme" parent="@style/Theme.AppCompat.Light">

If you are facing issue in loading this theme than please follow the below link to resolve compilation issue.

Can't Find Theme.AppCompat.Light for New Android ActionBar Support

android studio my helloWorld project has stopped

3 Answers3