title: Why android studio always crashed? (Intent)
body: <p>Do you have any idea why using intent always crash in Android Studio? </p>
  
  <pre><code>public void signin(View view) {
      Intent i = new Intent(this, Sign_In.class);
      startActivity(i);
  }
  </code></pre>
  
  <p>That's my simple code and it wouldn't work! I mean it crashed. I used same codes before and it works. What do you think the reason why I couldn't Intent a layout or other activity? I'd clean and rebuild the project..</p>