Jordy de Koning Jordy de Koning - 7 months ago 442
Java Question

Cannot resolve method 'findViewByID(int)' in Android Studio

I only just started coding for androud, but I've been getting the error:
"Cannot resolve method 'findViewByID(int)'" in android studio

I can't seem to find out what is wrong, have tried setting contentView, implementing OnClickListenener, but none of these fixed anything.

full code below, the MainActivity Method is where it all happens:

package aprivate.contract.jdeko.dww_registration;

import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.view.View.OnClickListener;

import com.google.android.gms.appindexing.Action;
import com.google.android.gms.appindexing.AppIndex;
import com.google.android.gms.common.api.GoogleApiClient;


public class MainActivity extends AppCompatActivity{
private GoogleApiClient client;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button clickButton = (Button) findViewByID(R.id.Btn);
clickButton.setOnClickListener( new OnClickListener() {

@Override
public void onClick(View v) {
//todo
}
});
}

@Override
public void onStart() {
super.onStart();

// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
client.connect();
Action viewAction = Action.newAction(
Action.TYPE_VIEW, // TODO: choose an action type.
"Main Page", // TODO: Define a title for the content shown.
// TODO: If you have web page content that matches this app activity's content,
// make sure this auto-generated web page URL is correct.
// Otherwise, set the URL to null.
Uri.parse("http://host/path"),
// TODO: Make sure this auto-generated app URL is correct.
Uri.parse("android-app://aprivate.contract.jdeko.dww_registration/http/host/path")
);
AppIndex.AppIndexApi.start(client, viewAction);
}

@Override
public void onStop() {
super.onStop();

// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
Action viewAction = Action.newAction(
Action.TYPE_VIEW, // TODO: choose an action type.
"Main Page", // TODO: Define a title for the content shown.
// TODO: If you have web page content that matches this app activity's content,
// make sure this auto-generated web page URL is correct.
// Otherwise, set the URL to null.
Uri.parse("http://host/path"),
// TODO: Make sure this auto-generated app URL is correct.
Uri.parse("android-app://aprivate.contract.jdeko.dww_registration/http/host/path")
);
AppIndex.AppIndexApi.end(client, viewAction);
client.disconnect();
}

}

Answer

It's just a typo that you have made. You should use "Id" instead of "ID".

So your:

Button clickButton = (Button) findViewByID(R.id.Btn);

Becomes:

Button clickButton = (Button) findViewById(R.id.Btn);
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