判断来电状态 确定号码：

public class MyPhoneStateListener extends PhoneStateListener {
   private String[] projection = new String[] {
            People._ID, People.NAME, People.NUMBER
    };
  public void onCallStateChanged(int state,String incomingNumber){
    switch(state)
    {
      case TelephonyManager.CALL_STATE_IDLE:
        Log.d("DEBUG", "IDLE");
      break;
      case TelephonyManager.CALL_STATE_OFFHOOK:
        if(!incomingNumber.equals("")){
          handleCall(incomingCall);
        }
      break;
     case TelephonyManager.CALL_STATE_RINGING:
        Log.d("DEBUG", "RINGING");
     break;
    }
  }
  public void handleCall(String incomingCall){
    Uri contactUri = Uri.withAppendedPath(Contacts.Phones.CONTENT_FILTER_URL,
                         incomingNumber);
    contactsCursor = context.getContentResolver().query(contactUri,
                       projection, null , null, People.NAME + " ASC");
    if(contactsCursor.moveToFirst()){
      int phoneNameIndex = contactsCursor.getColumnIndex(People.NAME);
      String phoneNameStr = contactsCursor.getString(phoneNameIndex);
      Log.d("DEBUG",phoneNameStr + " is calling");
    }else{
      Log.d("DEBUG","Not a contact");
    }
  }
}

如果要使用receive则：

<application>
  .....
  <receiver android:name=".ServiceReceiver">
    <intent-filter>
      <action android:name="android.intent.action.PHONE_STATE" />
    </intent-filter>
  </receiver>

public class ServiceReceiver extends BroadcastReceiver {
  @Override
  public void onReceive(Context context, Intent intent) {
    MyPhoneStateListener phoneListener=new MyPhoneStateListener();
    TelephonyManager telephony = (TelephonyManager)
                     context.getSystemService(Context.TELEPHONY_SERVICE);
    telephony.listen(phoneListener,PhoneStateListener.LISTEN_CALL_STATE);
  }
}
</application>
<uses-permission android:name="android.permission.READ_PHONE_STATE">
</uses-permission>