Question

我已经尝试构建一段代码来验证＆＃34;数据连通性; 假设用户已打开数据，我想等待＆＃34;等待＆＃34;因为它回来了，时间有限：

final PhoneStateListener phoneStateListener = new PhoneStateListener() {
        // occurs also when network state changes
        @Override
        public void onDataConnectionStateChanged(int state) {
            if (state == TelephonyManager.DATA_CONNECTED) {
                synchronized (lock) {
                    lock.notifyAll();
                }

            }
        }
    };

我注册了听众：

telMgr.listen(phoneStateListener, PhoneStateListener.LISTEN_DATA_CONNECTION_STATE);

然后我等待锁定：

synchronized (lock) {
            if (telMgr.getDataState() != TelephonyManager.DATA_CONNECTED)
                lock.wait(timeMS);
        }

似乎总是等待整个timeMS毫秒，即使我很久以前打开数据。在调试时，似乎只有在等待结束后，活动流程才会继续，我才会收到有关＆＃34; OnDataConnectionState＆＃34;的通知。只是稍后改变，好几次，好像监听器在同一个主线程上运行，一旦主线程阻塞，没有＆＃34;事件＆＃34;收到并且＆＃34; OnDataStateChange＆＃34;方法未被调用。听众的确如何运作，是否有可能以某种方式解决这个问题？

甲基的完整代码

public static boolean verifyDataConnectivity(long timeMS, Context context)
{
    final Object lock= new Object();
    final Context mainContext = context;
    final TelephonyManager telMgr = (TelephonyManager)(mainContext
            .getSystemService(Context.TELEPHONY_SERVICE));
   // Handler handler = new Handler(Looper.getMainLooper());
   // Handler handler = new Handler( mainContext.getMainLooper());
    final PhoneStateListener phoneStateListener = new PhoneStateListener() {
        // occurs also when network state changes
        @Override
        public void onDataConnectionStateChanged(int state) {
            if (state == TelephonyManager.DATA_CONNECTED) {
                synchronized (lock) {
                    lock.notifyAll();
                }

            }
        }
    };

    try {

        telMgr.listen(phoneStateListener, PhoneStateListener.LISTEN_DATA_CONNECTION_STATE);

        Runnable rListener = new Runnable() {

            @Override
            public void run() {
                // Register phone state listener:
                telMgr.listen(phoneStateListener, PhoneStateListener.LISTEN_DATA_CONNECTION_STATE);

            }
        };

       // handler.post(rListener);

        synchronized (lock) {
            if (telMgr.getDataState() != TelephonyManager.DATA_CONNECTED)
                lock.wait(timeMS);
        }
        if (telMgr.getDataState() != TelephonyManager.DATA_CONNECTED)
            return false;

        return true;

    } catch (Exception e) {
        Log.e(ANDROID_COMMON_TAG, e.getMessage());
        e.printStackTrace();
        return false;
    }
    finally
    {
        if (phoneStateListener != null)
            telMgr.listen(phoneStateListener, PhoneStateListener.LISTEN_NONE);
    }
}

Android PhoneStateListener在主线程上运行？

0 个答案: