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在Android中有来电时如何获取电话号码？

我刚刚进入Android开发阶段,并决定我对这个新领域的第一次征服将是掌握手机对来电的反应.

稍微用谷歌搜索引导我到http://www.compiletimeerror.com/2013/08/android-call-state-listener-example.html#.Vi3Ren4vfwM(所以我的代码与他/她的代码有着惊人的相似之处).

我的主要(也是唯一)活动如下所示:

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.util.Log;
import android.view.Menu;
import android.widget.Toast;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    TelephonyManager TelephonyMgr = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
    TelephonyMgr.listen(new TeleListener(),
            PhoneStateListener.LISTEN_CALL_STATE);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
}
class TeleListener extends PhoneStateListener {
    public void onCallStateChanged(int state, String incomingNumber) {
        super.onCallStateChanged(state, incomingNumber);
        switch (state) {
            case TelephonyManager.CALL_STATE_IDLE:
                // CALL_STATE_IDLE;
                Log.d("MyLittleDebugger", "I'm …