号码手机不显示onCallStateChanged Android

Question

我已经创建了一个应用程序，而且我的应用程序有一个功能与获取手机号码手机有关，但我无法接听号码手机，它是空的

我的服务

public int onStartCommand(Intent intent, int flags, int startId) {
    TelephonyMgr = (TelephonyManager) getSystemService(getApplicationContext().TELEPHONY_SERVICE);
    TelephonyMgr.listen(new PhoneCallListener(),PhoneStateListener.LISTEN_CALL_STATE);
return START_STICKY;
}
private class PhoneCallListener extends PhoneStateListener {

    private boolean isPhoneCalling = false;
    @Override
    public void onCallStateChanged(int state, String incomingNumber) {

        if (TelephonyManager.CALL_STATE_RINGING == state) {
            // phone ringing
            Log.i("NMC", "RINGING, number: " + incomingNumber);
        }
        if (TelephonyManager.CALL_STATE_OFFHOOK == state) {
            Log.i("NMC", "RINGING, number: " + incomingNumber);
            isPhoneCalling = true;
        }
        if (TelephonyManager.CALL_STATE_IDLE == state) {
            Log.i("NMC", "IDLE number");

        }
    }

}

清单

<?xml version="1.0" encoding="utf-8"?>

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="23" />

<uses-permission android:name="android.permission.READ_CALL_LOG" />
<uses-permission android:name="android.permission.WRITE_CALL_LOG" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.SEND_SMS" />
<uses-permission android:name="android.permission.READ_CONTACTS" />

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme">
    <activity
        android:name=".MainActivity"
        android:configChanges="orientation"
        android:screenOrientation="portrait">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <service android:name="com.example.sev_user.smisscall.MyService">


    </service>

</application>

显示日志，但号码电话为空