title: Nullpointer Exceptions
body: <p>I have been following some android tutorials on the web. I tried copying his code to the best of my ability but whenever I run the application it crashes. I looked through the console and found it was a Nullpointer exception that caused it. The application is meant to play a sound and then close and then go to another layout.
  Here is my code, please tell me what I did wrong.</p>
  
  <pre><code>    package com.greg.hello;
  
      import android.app.Activity;
      import android.content.Intent;
      import android.media.MediaPlayer;
      import android.os.Bundle;
  
      public class MainActivity extends Activity {
      MediaPlayer mpSplash;
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          // TODO Auto-generated method stub
          super.onCreate(savedInstanceState);
          setContentView(R.layout.splash);
          MediaPlayer mpSplash = MediaPlayer.create(this, R.raw.explosion);
          mpSplash.start();
          Thread logoTimer = new Thread(){
              public void run(){
                  try{
                      int logoTimer=0;
                      while(logoTimer&lt;8000){
                          sleep(100);
                          logoTimer=logoTimer+100;
                      }
                      startActivity(new     Intent("com.greg.hello.CLEARSCREEN"));
                  } catch (InterruptedException e) {
                      // TODO Auto-generated catch block
                      setContentView(R.layout.tutorial1);
                      e.printStackTrace();
                  }
  
                  finally{
                      finish();
                  }
              }   
          };
          logoTimer.start();
          finish();
      }
  
      @Override
      protected void onDestroy() {
          // TODO Auto-generated method stub
          super.onDestroy();
          mpSplash.release();
          startActivity(new Intent("com.greg.hello.TUTORIALONE"));
          setContentView(R.layout.activity_main);
      }
  
      @Override
      protected void onPause() {
          // TODO Auto-generated method stub
          super.onPause();
          mpSplash.pause();
          setContentView(R.layout.activity_main);
      }
  
      @Override
      protected void onResume() {
          // TODO Auto-generated method stub
          super.onResume();
          mpSplash.start();
          setContentView(R.layout.activity_main);
      }
  
      @Override
      protected void onStart() {
          // TODO Auto-generated method stub
          super.onStart();
          setContentView(R.layout.activity_main);
      }
  
      @Override
      protected void onStop() {
          // TODO Auto-generated method stub
          super.onStop();
          setContentView(R.layout.activity_main);
      }
  
  }
  </code></pre>