Mgiyuk

android studio :Attempt to invoke virtual method on a null object reference can someone help me? whenever i click on the dialoginterface.onclicklistener button the app just crashes can anyone check for me my codes . ALso when i want the same dialoginterface button to retrieve the inserted data from database to be viewed as a list view ill provide with database and page codes public class mainscreen extends AppCompatActivity { private static final String TAG = "ListDataActivity"; ImageButton add; DatabaseHelper db; private ListView listView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_mainscreen); listView = (ListView)findViewById(R.id.listview); add = (ImageButton) findViewById(R.id.addbtn); //populateListView(); add.setOnClickListener(new View.OnClickListener() { @Override public void onClick...

How to add fitur update on android studio with SQLite [on hold] I have a link tutorial to block incoming call android studio, Ok, this link http://www.androidbegin.com/tutorial/automatic-call-blocking-using-android-telephony-tutorial/ But, in this tutorial have not fitur update. Anyone can helpme to add simple update? sorry i'am not include sourcode in this question. I think to easy look sourcode in link tutorial, http://www.androidbegin.com/tutorial/automatic-call-blocking-using-android-telephony-tutorial/ - Thanks Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.