App Crashes When Button Is Hit Although No Errors Shown

I'm trying to build an app with four different activities. On my start page, there are 4 buttons. When you click on a button you should be directed to the correspondent activity.

Solution 1:

You are missing the activities from your manifest. When you create an activity it must be added here as well.

I recommend reading the Android Application Fundamentals.

<activityandroid:name=".MainActivity"android:label="@string/app_name"><intent-filter><actionandroid:name="android.intent.action.MAIN" /><categoryandroid:name="android.intent.category.LAUNCHER" /></intent-filter></activity><activityandroid:name=".Allgemein"android:launchMode="singleTop"/>

Also, In the example you provided for your activity, you are not overriding the onCreate method. Make sure all your Activities have this change.

publicclassAllgemeinextendsAppCompatActivity {

    @Override//You are missing this.protectedvoidonCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_allgemein);
    }
}