title: void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
body: <p>Hello can anyone help me solving this problem I don't understand what exactly is wrong and Hello can anyone help me solving this problem I don't understand what exactly is wrong Hello can anyone help me solving this problem I don't understand what exactly is wrong and Hello can anyone help me solving this problem I don't understand what exactly is wrong</p>
  
  <p>MainActivity.java</p>
  
  <pre><code>    public class MainActivity extends AppCompatActivity {
  
       Button btnSearch,btnDailyEntry,btnNewCust;
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
  
          btnSearch.setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View v) {
                  btnSearch = (Button)findViewById(R.id.btn_search) ;
                  Intent intent = new Intent(v.getContext(),Search.class);
                  startActivity(intent);
              }
          });
          btnNewCust.setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View v) {
                  btnDailyEntry = (Button)findViewById(R.id.btn_daily_entry) ;
                  Intent intent = new Intent(v.getContext(),NewCust.class);
                  startActivity(intent);
              }
          });
          btnDailyEntry.setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View v) {
                  btnNewCust = (Button)findViewById(R.id.btn_new_cust);
                  Intent intent = new Intent(v.getContext(),DailyEntry.class);
                  startActivity(intent);
              }
          });
  
      }
  
  
  }
  </code></pre>
  
  <p>activity_main.xml</p>
  
  <pre><code>    &lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:fitsSystemWindows="true"
      android:orientation="vertical"
      android:gravity="center"&gt;
  
      &lt;TextView
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="Daily Entry System"
          android:textColor="@android:color/holo_blue_dark"
          android:textSize="20dp"/&gt;
      &lt;Button
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="Search"
          android:id="@+id/btn_search" /&gt;
  
  
      &lt;Button
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="Daily Entry"
          android:id="@+id/btn_daily_entry" /&gt;
  
      &lt;Button
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="New Cust"
          android:id="@+id/btn_new_cust" /&gt;
  &lt;/LinearLayout&gt;
  </code></pre>