I'm developing a simple smart lock app with google sign in with firebase. After login to authentication activity, I tried to change activity to my main activity through "change to main activity" button. But it suddenly crash. Is there any solution for this problem?
In java:
public void openMainActivity(View view) {
Intent intent;
intent = new Intent(this, MainActivity.class);
startActivity(intent);
}
In layout:
<Button
android:id="@+id/btn_change"
android:text="Servo Lock"
android:layout_centerInParent="true"
android:onClick="openMainActivity"
android:layout_above="@+id/btn_sign_out"
android:layout_marginBottom="50dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
I expect that it can change from auth activity to main activity. But the app suddenly crash.
