我在使用Android Studio开发一个Android Wear应用时，想添加一个简短的提示信息。
但是我遇到了一个问题，就是代码中出现了“Cannot Resolve Symbol R”的错误提示，我不知道为什么会出现这个错误。
import android.app.Activity;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.wearable.view.WatchViewStub;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class MyActivity extends Activity {
private TextView mTextView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
//getnextpage
Button getnextpage;
getnextpage = (Button) findViewById(R.id.getnextpage);
getnextpage.setOnClickListener(new OnclickListener() {
public void onClick(View v) {
Toast.makeText(getApplicationContext(), "Here is 2nd Page", Toast.LENGTH_LONG).show();
}
});
final WatchViewStub stub = (WatchViewStub) findViewById(R.id.watch_view_stub);
stub.setOnLayoutInflatedListener(new WatchViewStub.OnLayoutInflatedListener() {
@Override
public void onLayoutInflated(WatchViewStub stub) {
mTextView = (TextView) stub.findViewById(R.id.text);
}
});
}
}