Intent intent = new Intent(Intent.ACTION_CALL,Uri.parse("tel:110"));
                startActivity(intent);

public class OutCallReceiver extends BroadcastReceiver {
     public void onReceive(Context context, Intent intent) {
           setResultData(null); //清除電話，廣播被傳給系統的接收者后，因為電話為null，取消電話拔打
          // 同樣如果你想修改外拔的電話號碼，可以這樣做
          // String phone = getResultData();//得到外拔電話
          // setResultData(“12593”+ phone);//在電話前面加上12593
     }
}

<receiver android:name=".OutgoingCallReceiver">
    <intent-filter android:priority="1">
         <action android:name="android.intent.action.NEW_OUTGOING_CALL"/>
    </intent-filter>
</receiver>

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