TelephonyManager.listen的使用

最新推荐文章于 2024-10-28 14:52:29 发布

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最新推荐文章于 2024-10-28 14:52:29 发布

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分类专栏： Android 文章标签： android TelephonyManager TelephonyManager.lis

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本文深入探讨了TelephonyManager.java中的listen方法，解释了其作用、参数以及如何正确使用来监听手机call状态。同时，提供了一个简单的示例代码，帮助开发者更好地理解和应用此方法。

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TelephonyManager.java中的listen 方法原型：

/**
     * Registers a listener object to receive notification of changes
     * in specified telephony states.
     * <p>
     * To register a listener, pass a {@link PhoneStateListener}
     * and specify at least one telephony state of interest in
     * the events argument.
     *
     * At registration, and when a specified telephony state
     * changes, the telephony manager invokes the appropriate
     * callback method on the listener object and passes the
     * current (udpated) values.
     * <p>
     * To unregister a listener, pass the listener object and set the
     * events argument to
     * {@link PhoneStateListener#LISTEN_NONE LISTEN_NONE} (0).
     *
     * @param listener The {@link PhoneStateListener} object to register
     *                 (or unregister)
     * @param events The telephony state(s) of interest to the listener,
     *               as a bitwise-OR combination of {@link PhoneStateListener}
     *               LISTEN_ flags.
     */
    public void listen(PhoneStateListener listener, int events) {
        String pkgForDebug = mContext != null ? mContext.getPackageName() : "<unknown>";
        try {
            Boolean notifyNow = true;
            sRegistry.listen(pkgForDebug, listener.callback, events, notifyNow);
        } catch (RemoteException ex) {
            // system process dead
        } catch (NullPointerException ex) {
            // system process dead
        }
    }

private static ITelephonyRegistry sRegistry;

主要就是用来监听手机call状态，需要调用

mTelephonyManager.listen(mPhoneStateListener, PhoneStateListener.LISTEN_NONE);

来去除监听，否则会泄漏整个activity对象。

监听示例：

private TelephonyManager mTelephonyManager;
    private PhoneStateListener mPhoneStateListener = new PhoneStateListener() {

		@Override
		public void onCallStateChanged(int state, String incomingNumber) {
			// TODO Auto-generated method stub
			super.onCallStateChanged(state, incomingNumber);
			if(state == TelephonyManager.CALL_STATE_OFFHOOK) {
				//通话中
			} else if (state == TelephonyManager.CALL_STATE_IDLE) {}
		}
    	
    };