title: Error:(23, 26) String types not allowed (at 'src' with value 'pen').?
body: <p>So i'm trying to learn android development and im trying this program but its giving me the error <code>Error:(23, 26) String types not allowed (at 'src' with value 'pen').</code> when i try to run it on my Nexus 6.</p>
  
  <p>Java Code:
      import android.support.v7.app.AppCompatActivity;
      import android.os.Bundle;
      import android.widget.Button;
      import android.widget.TextView;
      import android.widget.EditText;</p>
  
  <pre><code>public class MainActivity extends AppCompatActivity {
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
  
          Button ImageButton = (Button)findViewById(R.id.Image);
  
          ImageButton.setOnClickListener(
                  new Button.OnClickListener(){
                      public void onClick(View v)
                      {
                          TextView NL = (TextView)findViewById(R.id.Asd)
                          NL.setText("AAA");
                      }
                  }
          );
  
  
      }
  }
  </code></pre>
  
  <p>XML code:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:tools="http://schemas.android.com/tools"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      tools:context="com.example.bassammetwally.anew.MainActivity"&gt;
      &lt;RelativeLayout
          android:layout_width="400dp"
          android:layout_height="50dp"
          android:background="#3955a1"&gt;
          &lt;TextView
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:text="Learning program"
              android:textColor="#ffffff"
              android:textSize="30dp"
              android:layout_marginLeft="10dp"
              android:layout_marginTop="8dp"
              android:id="@+id/Asd"/&gt;
          &lt;ImageButton
              android:layout_width="40dp"
              android:layout_height="40dp"
              android:src="pen"
              android:layout_marginLeft="330dp"
              android:layout_marginTop="5dp"
              android:scaleType="fitXY"
              android:adjustViewBounds="true"
              android:id="@+id/image"/&gt;
          &lt;/RelativeLayout&gt;
  &lt;/LinearLayout&gt;
  </code></pre>
  
  <p>ManiFest:</p>
  
  <pre><code> &lt;?xml version="1.0" encoding="utf-8"?&gt;
      &lt;manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.example.A.anew"&gt;
  
          &lt;application
              android:allowBackup="true"
              android:icon="@mipmap/ic_launcher"
              android:label="@string/app_name"
              android:supportsRtl="true"
              android:theme="@style/AppTheme"&gt;
              &lt;activity android:name=".MainActivity"&gt;
                  &lt;intent-filter&gt;
                      &lt;action android:name="android.intent.action.MAIN" /&gt;
  
                      &lt;category android:name="android.intent.category.LAUNCHER" /&gt;
                  &lt;/intent-filter&gt;
              &lt;/activity&gt;
          &lt;/application&gt;
  
      &lt;/manifest&gt;
  </code></pre>