How do you change the default dialer package in android studio?

Question

I'm currently trying to change the default dialer package of the machine to my application. When running the code that is supposed to change it, however, it results in the default dialer package retaining a value of NULL. This is loosely following the guide here, but some of it is deprecated so I've had to make some adjustments.

EDIT: has REQUEST_CODE_DEFAULT_DIALER been changed somehow? I can't find it referenced anywhere other than outdated tutorials on how to do this, so I'm not sure what it would even have been changed to. I'm getting a "cannot resolve symbol" error whenever I try to use it.

I've included the following under the relevant activity in my AndroidManifest.xml:

<intent-filter>
    <action android:name="android.intent.action.DIAL" />
    <category android:name="android.intent.category.DEFAULT" />
</intent-filter>
<intent-filter>
    <action android:name="android.intent.action.DIAL" />
    <category android:name="android.intent.category.DEFAULT" />
    <data android:scheme = "tel"/>
</intent-filter>

The following code executes the package change and then prints its value to logcat so I can see what happens:

Log.i("Before", "Before default dialer change");
startActivity(new Intent(TelecomManager.ACTION_CHANGE_DEFAULT_DIALER).putExtra(TelecomManager.EXTRA_CHANGE_DEFAULT_DIALER_PACKAGE_NAME,getPackageName()));
TelecomManager telecomManager = ((TelecomManager) getSystemService(Context.TELECOM_SERVICE));
if(telecomManager.getDefaultDialerPackage() == null) {
    Log.i("Default dialer package:", "NULL");
} else {
    Log.i("Default Dialer Package:", telecomManager.getDefaultDialerPackage());

}

I'm getting "Default dialer package:: NULL" in logcat every time I try this.

Answer 1

Intents are asynchronous. If you start an activity to do something, you have to wait for that intent to finish before using the results of it. You're instead immediately querying for the default dialer package. That will always fail, because it wouldn't even have shown the picker on screen yet.