android7.0关于TelephonyManager.getDeviceId()返回null的问题

在android7.0的系统下发现TelephonyManager.getDeviceId()在权限允许的情况下取得返回值也为null，解决方法如下:

public static String getDeviceId(Context context) {

    String id;
    //android.telephony.TelephonyManager
    TelephonyManager mTelephony = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
    if (mTelephony.getDeviceId() != null) {
        id = mTelephony.getDeviceId();
    } else {
        //android.provider.Settings;
        id = Settings.Secure.getString(context.getApplicationContext().getContentResolver(), Settings.Secure.ANDROID_ID);
    }
    return id;
}

相关资料地址:http://stackoverflow.com/questions/3802644/will-telephonymanger-getdeviceid-return-device-id-for-tablets-like-galaxy-tab