Android implements blacklisting function based on AudioManager and PhoneStateListener

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public class A11Activity extends Activity {
 private EditText et;//Add input box, enter and set blacklist private TextView tv01,tv02; //tv01 is used to display the blacklist entered in EditText; tv02 is used to display the current status of the mobile phone.  /** Called when the activity is first created. */
  @SuppressWarnings("static-access")
 @Override
  public void onCreate(Bundle savedInstanceState) {
    (savedInstanceState);
    setContentView();
    tv01=(TextView)findViewById(.tv01);
    tv02=(TextView)findViewById(.tv02);
    et=(EditText)findViewById();
    /**Create an object of PhoneCallListener; where PhoneCallListener is
      * Extended the PhoneStateListener class*/
    PhoneCallListener pcl=new PhoneCallListener();
    TelephonyManager tm=(TelephonyManager)getSystemService(TELEPHONY_SERVICE);
    //Set the function of monitoring phone    (pcl, pcl.LISTEN_CALL_STATE);
  }
  public class PhoneCallListener extends PhoneStateListener{
   public void onCallStateChanged(int state,String incomingNumber){
   switch(state){
   //When the phone status is standby, the phone ringtone is in normal mode   case TelephonyManager.CALL_STATE_IDLE:
    ("CALL_STATE_IDLE");
    AudioManager am=(AudioManager)getSystemService(Context.AUDIO_SERVICE);
    (AudioManager.MODE_NORMAL);
    (AudioManager.STREAM_RING);
    break;
    //The mobile phone status is on call   case TelephonyManager.CALL_STATE_OFFHOOK:
    ("CALL_STATE_OFFHOOK");
    break;
    //When the mobile phone mode is ringing   case TelephonyManager.CALL_STATE_RINGING:
    ("CALL_STATE_RINGING");
    // When the incoming call number is the same as the phone number on the blacklist, set the phone ringtone to mute    if((().toString())){
    AudioManager am01=(AudioManager)getSystemService(AUDIO_SERVICE);
    (AudioManager.RINGER_MODE_SILENT);
    (AudioManager.STREAM_RING);
    (, "The phone on the blacklist is muted!!", Toast.LENGTH_LONG).show();
    }
   }
   (state, incomingNumber);
   (new OnKeyListener(){
    @Override
    public boolean onKey(View v, int keyCode, KeyEvent event) {
    // TODO Auto-generated method stub
    (());
    ("");
    return true;
    }
    });
   }
  }
}