title: Send Whatsapp message to specific contact
body: <p>I followed this <a href="https://stackoverflow.com/questions/17768688/sending-message-through-whatsapp-by-intent">link</a> and this is my code</p>
  
  <pre><code>Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse("content://com.android.contacts/data/" + "MYNUMBER@s.whatsapp.net"));
                  i.setPackage("com.whatsapp");
                  startActivity(i);
  </code></pre>
  
  <p>This is my log</p>
  
  <pre><code>android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.intent.action.VIEW dat=content://com.android.contacts/data/MYNUMBER@s.whatsapp.net pkg=com.whatsapp }
          at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1545)
          at android.app.Instrumentation.execStartActivity(Instrumentation.java:1416)
          at android.app.Activity.startActivityForResult(Activity.java:3351)
          at android.app.Activity.startActivityForResult(Activity.java:3312)
          at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:824)
          at android.app.Activity.startActivity(Activity.java:3522)
          at android.app.Activity.startActivity(Activity.java:3490)
          at com.sieryuu.maidchan.MainActivity.onClick(MainActivity.java:61)
          at android.view.View.performClick(View.java:4147)
          at android.view.View$PerformClick.run(View.java:17161)
          at android.os.Handler.handleCallback(Handler.java:615)
          at android.os.Handler.dispatchMessage(Handler.java:92)
          at android.os.Looper.loop(Looper.java:213)
          at android.app.ActivityThread.main(ActivityThread.java:4787)
          at java.lang.reflect.Method.invokeNative(Native Method)
          at java.lang.reflect.Method.invoke(Method.java:511)
          at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
          at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556)
  </code></pre>
  
  <p><strong>My Question :</strong>
  How to send text to whatsapp contact in the background (without choose the contact number, I already know the ID)? <code>Root</code> if needed</p>