# Errors on sending serial data to Android

**URL:** <https://discourse.processing.org/t/errors-on-sending-serial-data-to-android/11430>\
**Category:** Processing for Android\
**Created:** [May 20, 2019, 5:30pm UTC](https://discourse.processing.org/t/errors-on-sending-serial-data-to-android/11430 "2019-05-20T17:30:40Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![mash](https://avatars.discourse-cdn.com/v4/letter/m/e19adc/32.png) [@mash](https://discourse.processing.org/u/mash)\
**Post date:** [May 20, 2019, 5:30pm UTC](https://discourse.processing.org/t/errors-on-sending-serial-data-to-android/11430/1 "2019-05-20T17:30:40Z")

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I am using a STM 32 to send serial data over to an android. I have edited the manifest file as well as the driver file before running it. It builds, but then shows the following error:  
(P.S: running it on Android 9, Google Pixel)

> BUILD SUCCESSFUL in 1m 47s  
> 28 actionable tasks: 28 executed  
> FATAL EXCEPTION: main  
> Process: processing.test.newfunayasd, PID: 5146  
> java.lang.RuntimeException: Unable to start activity ComponentInfo{processing.test.newfunayasd/processing.test.newfunayasd.MainActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.  
> at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2951)  
> at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3086)  
> at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)  
> at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)  
> at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)  
> at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1816)  
> at android.os.Handler.dispatchMessage(Handler.java:106)  
> at android.os.Looper.loop(Looper.java:193)  
> at android.app.ActivityThread.main(ActivityThread.java:6718)  
> at java.lang.reflect.Method.invoke(Native Method)  
> at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)  
> at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)  
> Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.  
> at android.support.v7.app.AppCompatDelegateImplV9.createSubDecor(AppCompatDelegateImplV9.java:354)  
> at android.support.v7.app.AppCompatDelegateImplV9.ensureSubDecor(AppCompatDelegateImplV9.java:323)  
> at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:293)  
> at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:149)  
> at processing.test.newfunayasd.MainActivity.onCreate(MainActivity.java:21)  
> at android.app.Activity.performCreate(Activity.java:7144)  
> at android.app.Activity.performCreate(Activity.java:7135)  
> at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)  
> at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2931)  
> … 11 more

---

<div class="post-metadata">

**Author:** ![akenaton](https://avatars.discourse-cdn.com/v4/letter/a/a88e4f/32.png) [@akenaton](https://discourse.processing.org/u/akenaton)\
**Post date:** [May 23, 2019, 3:27pm UTC](https://discourse.processing.org/t/errors-on-sending-serial-data-to-android/11430/2 "2019-05-23T15:27:04Z")

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@mash ===

change your theme in the Manifest