如何在android中解决此错误“com.android.internal.telephony无法解析为类型”

我正在创建简单的呼叫过滤应用程序,限制不必要的呼我使用以下代码来限制调用,但我无法在下面的代码中解决此行的问题“com. android.internal.telephony.ITelephony telephonyService =(ITelephony)m.invoke(tm);”它显示错误消息com. android.internal.telephony无法解析为android中的某个类型如何解决此错误.

public class CallBlockReceiver extends broadcastReceiver{

    @Override
    public void onReceive(Context context,Intent intent) {
        // Todo Auto-generated method stub

    }

    private void getTeleService(Context context) {
        TelephonyManager tm = (TelephonyManager) context
                .getSystemService(Context.TELEPHONY_SERVICE);
        try {
            // Java reflection to gain access to TelephonyManager's
            // ITelephony getter
            Log.v("","Get getTeleService...");
            Class c = Class.forName(tm.getClass().getName());
            Method m = c.getDeclaredMethod("getITelephony");
            m.setAccessible(true);
            com.android.internal.telephony.ITelephony telephonyService = (ITelephony) m.invoke(tm);
        } catch (Exception e) {
            e.printstacktrace();
            Log.e("","Fatal error: Could not connect to telephony subsystem");
            Log.e("","Exception object: " + e);
        }
}

}

请帮我 .