相关疑难解决方法(0)

我正在努力建立,PhoneStateListener但我得到了一个PhoneCallListener cannot be resolved to a type.

public class ButtonView extends FrameLayout  {

     PhoneCallListener phoneListener = new PhoneCallListener();
     TelephonyManager telephonyManager = (TelephonyManager) this.getSystemService(Context.TELEPHONY_SERVICE);
     telephonyManager.listen(phoneListener,PhoneStateListener.LISTEN_CALL_STATE);
}

在另一个例子中,我发现它写得像这样,它正在工作

public class MainActivity extends Activity {
    public void onCreate(Bundle savedInstanceState) {

        // add PhoneStateListener
        PhoneCallListener phoneListener = new PhoneCallListener();
        TelephonyManager telephonyManager = (TelephonyManager) this
            .getSystemService(Context.TELEPHONY_SERVICE);
        telephonyManager.listen(phoneListener,PhoneStateListener.LISTEN_CALL_STATE);
}

我应该在代码中更改什么才能使其正常工作？