I'm trying to change a LinearLayout from another class, but when i run this code:
public class IRC extends PircBot {
ArrayList<String> channels;
ArrayList<Integer> userCount;
ArrayList<String> topics;
LinearLayout channelLayout;
Context context;
public IRC(Context ctx) {
this.setName("xxxx");
channels = new ArrayList<String>();
userCount = new ArrayList<Integer>();
topics = new ArrayList<String>();
context = ctx;
channelLayout = (LinearLayout) ((Activity) context).findViewById(R.id.channels);
}
i get a ClassCastException
context is the Main activity that extends Activity passed with a getApplicationContext();
LOGCAT
05-08 17:53:55.102 3736-3799/g.d.allinonechat E/AndroidRuntime? FATAL EXCEPTION: Thread-5357
java.lang.ClassCastException: android.app.Application cannot be cast to android.app.Activity
at g.d.xxx.IRC.<init>(IRC.java:34)
at g.d.xxx.MainActivity$1.run(MainActivity.java:49)
at java.lang.Thread.run(Thread.java:856)
This question is related to
java
android
android-activity
classcastexception
You are passing the Application Context not the Activity Context with
getApplicationContext();
Wherever you are passing it pass this or ActivityName.this instead.
Since you are trying to cast the Context you pass (Application not Activity as you thought) to an Activity with
(Activity)
you get this exception because you can't cast the Application to Activity since Application is not a sub-class of Activity.
In my case, when I'm in an activity that extends from AppCompatActivity, it did not work(Activity) getApplicationContext (), I just putthis in its place.
in case your project use dagger, and then this error show up you can add this at android manifest
<application
...
android: name = ".BaseApplication"
...> ...
You can also try this one.
override fun registerWith( registry: PluginRegistry) {
GeneratedPluginRegistrant.registerWith(registry as FlutterEngine)
//registry.registrarFor("io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin")
}
I think this one is far better solution than creating a new class.
You are getting this error because the parameter required is Activity and you are passing it the Application.
So, either you cast application to the Activity like: (Activity)getApplicationContext();
Or you can just type the Activity like: MyActivity.this
Source: Stackoverflow.com