android9.0 source call shielding

Firstly, by acquiring TelephonyManage, secondly, by inheriting PhoneStateListener to monitor the changes of the phone state, and executing to determine
where this function is needed plus registerphone (this||***.this)

 public void registerphone(Context context) {
    
     mPhoneStateListener = new PhoneCallListener(); //监听
    
    mTelephonyManager = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE); //获取TelephonyManager
     
     mTelephonyManager.listen(mPhoneStateListener, PhoneStateListener.LISTEN_CALL_STATE); //listen执行

 }	
public class PhoneCallListener extends PhoneStateListener { //继承PhoneStateListener 
    public void onCallStateChanged(int state, String incomingNumber) {
        Log.d(TAG, "onCallStateChanged-state: " + state); //打印LOG
        Log.d(TAG, "onCallStateChanged-incomingNumber: " + incomingNumber);
        switch (state)  { //执行判断
            case TelephonyManager.CALL_STATE_RINGING: //电话状态
                 endCall(); //挂断
                break;
            default:
                break;
        }
        super.onCallStateChanged(state, incomingNumber);
    }
}

private void endCall() {
    try {
       mTelephonyManager.endCall();    //调用mTelephonyManager中的endCall（）进行挂断
    } catch (Exception e) {
        e.printStackTrace();
        Log.e(TAG, "endCallError", e);
    }
}

Unblock call

@Override

protected void onDestroy() {
    
    super.onDestroy();
	
	mTelephonyManager.listen(mPhoneStateListener, PhoneStateListener.LISTEN_NONE);

	
}

Add in onDestroy where needed

Attach listen()

 public void listen(PhoneStateListener listener, int events) {
   
    if (mContext == null || listener == null) return;
   
    try {
        
        boolean notifyNow = (getITelephony() != null);
        
        // If the listener has not explicitly set the subId (for example, created with the
       
        // default constructor), replace the subId so it will listen to the account the
       
        // telephony manager is created with.
       
        if (listener.mSubId == null) {
       
            listener.mSubId = mSubId;
     
        }

        ITelephonyRegistry registry = getTelephonyRegistry();
        if (registry != null) {
            registry.listenForSubscriber(listener.mSubId, getOpPackageName(),
                    listener.callback, events, notifyNow);
        } else {
            Rlog.w(TAG, "telephony registry not ready.");
        }
    } catch (RemoteException ex) {
        // system process dead
    }
}

PhoneStateListener.LISTEN_NONE值

           public static final int LISTEN_NONE = 0;