findviewbyid

Hey guys today I started to develop my own little alarmclock app. But now I've got a problem, and I'm searching for three hours and couldn't solve it. When I try to implement a listview with a custom design for each row, i get a NullPointerException, when I try to set the text from a textview in the layout. The reason for this exception is, that the findViewById-Call returns null and not the TextView I want to have. On my search I found these two posts, but unfortunately they didn't help very well... Post1 - Stackoverflow Post2 - Stackoverflow I'm using the same basic structure as in the two

I'm following this tutorial: Android Material Design Using Tabs Infos: Android API Level 21 Dependecies are added to graddle file compile 'com.android.support:appcompat-v7:23.0.1' and compile 'com.android.support:design:23.0.1' } The method "findViewById" cannot be resolved. I tried to follow this answer Cannot resolve method 'findViewById(int)' in Fragment , but this AppCompatActivity use OnCreateBundle instead OnCreateView, then i can't get the View object... What is wrong with this code ? I'm missing some import? package info.androidhive.materialtabs.activity; import android.os.Bundle;

I'm doing my project for getting data by acceleometer sensor in android platform. I'm having error codes in the 3 last line codes. Exactly the error is the findViewById is not for get data fragment. so, how I can use findviewbyId in Fragment for getting data accelerometer sensor?many thanks for the answer :) import android.app.Activity; import android.app.Fragment; import android.content.Context; import android.hardware.Sensor; import android.hardware.SensorManager; import android.os.Bundle; import android.view.LayoutInflater; import android.view.TextureView; import android.view.View; import

R.id.icon is already defined in Android API level 1. However, I am getting an NPE in a Android Design Support Library internal code while accessing an imageview inflated using R.id.icon . NOTE: I am not targetting Oreo as my targetSdk is currently 25 . Here is the stacktrace: Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.ViewGroup$LayoutParams android.widget.ImageView.getLayoutParams()' on a null object reference at android.support.design.internal.BottomNavigationItemView.setChecked(BottomNavigationItemView.java:172) at android.support.design

As I'm tired of writing a cast operator for EVERY Activity.findViewById() that returns raw View , I finally tried one way that was suggested by Internet . public abstract class MyActivity extends Activity { @SuppressWarnings("unchecked") protected <T extends View> T findViewByID(int id) { return (T) this.findViewById(id); } } Note this isn't overloaded (the last "D" is upper case). The compiler says we can't cast View into T . Is there anything wrong with my implementing? Strangely, this suggestion was hardly seen in English websites (e.g. even in our lovely Stack Overflow), and the exception