Android. Open The Device's Contact List With An Intent Not Working. Unable To Instantiate Activity ComponentInfo

This is an experiment for understanding what ContactsContract can offer. I don't know what I've done wrong... Please help me with this problem. My code: package com.example.beni.co

Solution 1:

Instantiate your TextView inside onCreate method.

Change TextView tv = (TextView) findViewById(R.id.textView); to just TextView tv;

And add the following line in your onCreate method after setContentView(R.layout.activity_main); line:

tv = (TextView) findViewById(R.id.textView);