title: App crashes on launch when trying to send an intent using checkboxes
body: <p>I'm trying to create an app for a project that send an intent based off of 5 check boxes. These check boxes have a conditional to find the total number of check boxes selected before being displayed on my second activity. </p>
  
  <p>My problem is that my code complies just fine but crashes instantly on launch. I've tried commenting out sections to isolate whats causing it but no success. </p>
  
  <p>I'm fairly new to android development so i'm sure its something simple i'm doing wrong.</p>
  
  <pre><code>    package com.example.cptbetty.dailymichaelmassard;
  
  import android.app.Activity;
  import android.content.Intent;
  import android.os.Bundle;
  import android.view.View;
  import android.widget.CheckBox;
  
  public class DailyMichaelMassardActivity extends 
  Activity implements View.OnClickListener {
  
  CheckBox checkBox1 = findViewById(R.id.checkBox1);
  CheckBox checkBox2 = findViewById(R.id.checkBox2);
  CheckBox checkBox3 = findViewById(R.id.checkBox3);
  CheckBox checkBox4 = findViewById(R.id.checkBox4);
  CheckBox checkBox5 = findViewById(R.id.checkBox5);
  int sum = 0;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_daily_michael_massard);
  
      checkBox1.setOnClickListener(this);
      checkBox2.setOnClickListener(this);
      checkBox3.setOnClickListener(this);
      checkBox4.setOnClickListener(this);
      checkBox5.setOnClickListener(this);
  }
  
  public void onSend(View view)
  {
      Intent intent = new Intent(Intent.ACTION_SEND);
      intent.putExtra(StatusActivity.MSG_Title, sum);
      intent.setType("text/plain");
      intent.putExtra(Intent.EXTRA_TEXT, sum);
      startActivity(intent);
  
  }
  
  
  @Override
  public void onClick(View v)
  {
     sum = 0;
      if (checkBox1.isChecked())
      {
          sum += 1;
      }
      else{
          sum += 0;
      }
      if (checkBox2.isChecked())
      {
          sum +=1;
      }
      else {
          sum += 0;
      }
      if (checkBox3.isChecked())
      {
          sum += 1;
      }
      else{
          sum =+ 0;
      }
      if (checkBox4.isChecked())
      {
          sum += 1;
      }
      else{
          sum += 0;
      }
      if (checkBox5.isChecked())
      {
          sum +=1;
      }
      else {
          sum += 0;
      }
      return;
  }
  </code></pre>
  
  <p>}</p>
  
  <p>Crash Log:</p>
  
  <blockquote>
    <p>10-03 02:22:28.868 5566-5566/com.example.cptbetty.dailymichaelmassard E/AndroidRuntime: FATAL EXCEPTION: main
        Process: com.example.cptbetty.dailymichaelmassard, PID: 5566
        java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.cptbetty.dailymichaelmassard/com.example.cptbetty.dailymichaelmassard.DailyMichaelMassardActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.Window.findViewById(int)' on a null object reference
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2832)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3037)
            at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
            at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
            at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1797)
            at android.os.Handler.dispatchMessage(Handler.java:106)
            at android.os.Looper.loop(Looper.java:193)
            at android.app.ActivityThread.main(ActivityThread.java:6642)
            at java.lang.reflect.Method.invoke(Native Method)
            at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
         Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.Window.findViewById(int)' on a null object reference
            at android.app.Activity.findViewById(Activity.java:2654)
            at com.example.cptbetty.dailymichaelmassard.DailyMichaelMassardActivity.(DailyMichaelMassardActivity.java:11)
            at java.lang.Class.newInstance(Native Method)
            at android.app.AppComponentFactory.instantiateActivity(AppComponentFactory.java:69)
            at android.app.Instrumentation.newActivity(Instrumentation.java:1215)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2820)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3037) 
            at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78) 
            at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108) 
            at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68) 
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1797) 
            at android.os.Handler.dispatchMessage(Handler.java:106) 
            at android.os.Looper.loop(Looper.java:193) 
            at android.app.ActivityThread.main(ActivityThread.java:6642) 
            at java.lang.reflect.Method.invoke(Native Method) 
            at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) 
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858) </p>
  </blockquote>
  
  <p>Activity im sending intent to:</p>
  
  <pre><code>    package com.example.cptbetty.dailymichaelmassard;
  
  import android.app.Activity;
  import android.content.Intent;
  import android.os.Bundle;
  import android.widget.TextView;
  
  public class StatusActivity extends Activity {
      public static final String MSG_Title = "message";
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_status);
      Intent intent = getIntent();
      String s = intent.getStringExtra(MSG_Title);
      TextView completeView = findViewById(R.id.completeView);
      completeView.setText(s);
  }
  </code></pre>
  
  <p>}</p>