Android realizes the vibration effect of mobile phone

<RelativeLayout xmlns:andro
 xmlns:tools="/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:paddingBottom="@dimen/activity_vertical_margin"
 android:paddingLeft="@dimen/activity_horizontal_margin"
 android:paddingRight="@dimen/activity_horizontal_margin"
 android:paddingTop="@dimen/activity_vertical_margin"
 tools:context=".MainActivity" >

 <EditText
 android:
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_alignParentLeft="true"
 android:layout_alignParentRight="true"
 android:layout_alignParentTop="true"
 android:layout_marginTop="16dp"
 android:ems="10" >

 <requestFocus />
 </EditText>

 <Button
 android:
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_alignLeft="@+id/et_text"
 android:layout_below="@+id/et_text"
 android:layout_marginTop="38dp"
 android:text="submit" />

</RelativeLayout>

package .test11;

import ;
import ;
import ;
import ;
import ;
import ;
import ;
import ;
import ;
import ;
import ;

public class MainActivity extends Activity {

 private EditText et_text;
 private Button btn_submit;
 /**
  * Mobile phone vibrator
  */
 private Vibrator vibrator;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 (savedInstanceState);
 setContentView(.activity_main);
 et_text = (EditText) (.et_text);
 btn_submit = (Button) (.btn_submit);

 // System service for vibration effects vibrator = (Vibrator) getSystemService(VIBRATOR_SERVICE);

 btn_submit.setOnClickListener(new OnClickListener() {
  String text = et_text.getText().toString().trim();

  public void onClick(View v) {
  if ((text)) {
   (, "Content is empty", 0).show();
   Animation shake = (
    , );
   et_text.startAnimation(shake);

   /*
    * The way of vibration
    */
   // (2000);// Vibrate for two seconds
   // Below is a vibration that can make the vibration regular -1: means no repetition 0: cyclic vibration   long[] pattern = { 200, 2000, 2000, 200, 200, 200 };
   (pattern, -1);
  }
  }
 });
 }
}

<?xml version="1.0" encoding="utf-8"?>
<cycleInterpolator xmlns:andro
 android:cycles="7" />

<?xml version="1.0" encoding="utf-8"?>
<translate xmlns:andro
 android:duration="1000"
 android:fromXDelta="0"
 android:interpolator="@anim/cycle_7"
 android:toXDelta="10" />

 <uses-permission android:name="" />