Material Alert Dialog, The style on this component requires your app theme to be Theme.AppCompat

Question

I'm trying to make a MaterialAlertDialog but I keep getting the following error no matter what

 java.lang.IllegalArgumentException: The style on this component requires your app theme to be Theme.AppCompat (or a descendant).
        at com.google.android.material.internal.ThemeEnforcement.checkTheme(ThemeEnforcement.java:243)
        at com.google.android.material.internal.ThemeEnforcement.checkAppCompatTheme(ThemeEnforcement.java:213)
        at com.google.android.material.internal.ThemeEnforcement.checkCompatibleTheme(ThemeEnforcement.java:148)
        at com.google.android.material.internal.ThemeEnforcement.obtainStyledAttributes(ThemeEnforcement.java:76)
        at com.google.android.material.dialog.MaterialDialogs.getDialogBackgroundInsets(MaterialDialogs.java:60)
        at com.google.android.material.dialog.MaterialAlertDialogBuilder.<init>(MaterialAlertDialogBuilder.java:117)
        at com.google.android.material.dialog.MaterialAlertDialogBuilder.<init>(MaterialAlertDialogBuilder.java:103)
        at com.adamm.quem.MainActivity$1.onItemClick(MainActivity.java:118)

I am using a custom theme as my MainActivity theme which is a parent of MaterialComponents

<style name="MainMaterialTheme" parent="Theme.MaterialComponents.Light.NoActionBar">
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>

Changing the theme to AppCompat doesn't help and isn't really right to do I am following the implementation as Material IO explains https://material.io/develop/android/components/dialog/

My code:

AlertDialog.Builder builder = new MaterialAlertDialogBuilder(getApplicationContext())
                            .setTitle("Title")
                            .setMessage("Message")
                    builder.show();

How can this be fixed?

Answer 1

You're passing in getApplicationContext() and the application context doesn't have your theme. Pass in your activity as the context:

AlertDialog.Builder builder = new MaterialAlertDialogBuilder(MainActivity.this)
    .setTitle("Title")
    .setMessage("Message")
builder.show();