LocalBoardcast 与 Boradcast

作者: 冰风47 | 来源:发表于2016-06-03 16:53 被阅读247次

LocalBoardcast 与 Boradcast
聊聊ZAB(三)
BroadcastReceiver广播原理分析
Android学习（三）—— 四大组件之Boradcast Re
&& 与& ，||与|
认真与身板
与荒野，与你，与自己
与雪与丘与故土
与海与浪与念
与

本来是在实验通过广播来获取系统状态的功能的. 偶然间发现还有LocalBoardcast这个东西 -_- 真汗颜.
赶紧恶补一下..

摘自网络博客:
在android-support-v4.jar中引入了LocalBroadcastManager，称为局部通知管理器，这种通知的好处是安全性高，效率也高，适合局部通信，可以用来代替Handler更新UI

现在总结一下主要使用流程.(相当简单)
用代码表示了.
(1) 设定一个广播

private ConnectivityManager mConnectivityManager = null;
private NetworkInfo mNetworkInfo = null;

private BroadcastReceiver mNetworkBoardcastReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {

        if (intent == null) {
            return;
        }
//            Log.d(logTitle, "onReceive: some boardcast" + intent.toString());
        String action = intent.getAction();
        if (action.equals(ConnectivityManager.CONNECTIVITY_ACTION)) {
            mConnectivityManager = (ConnectivityManager) getSystemService(Context
                    .CONNECTIVITY_SERVICE);
            mNetworkInfo = mConnectivityManager.getActiveNetworkInfo();
            if (mNetworkInfo != null && mNetworkInfo.isAvailable()) {
                if (mNetworkInfo.getTypeName().equals("WIFI")) {
                    sendNetworkStateBoardcast(ACTION_CONNECTIONED);
                    Log.d(logTitle, "netstate to:" + mNetworkInfo.getTypeName());

                } else {
                    sendNetworkStateBoardcast(STATE_NETWORK_MOBILE);
                    Log.d(logTitle, "netstate to:" + mNetworkInfo.getTypeName());
                }

            } else {
                sendNetworkStateBoardcast(ACTION_NO_CONNECTION);
            }
        }
    }
};

private void sendNetworkStateBoardcast(String state) {
    Intent sendIntent = new Intent(state);  
    LocalBroadcastManager.getInstance(getApplicationContext()).sendBroadcast(sendIntent);
}

(2) 设定广播接收器

public class BoardcastReceiverDetectSystemStatus extends BroadcastReceiver {
    Context currentContext;
    public BoardcastReceiverDetectSystemStatus() {
    }
    @Override
    public void onReceive(Context context, Intent intent) {
        Log.d("broadreveiver", "onReceive: intent is" + intent.toString());
    }
}

(3) activity内设定本地广播接收

        boardcastReceiverDetectSystemStatus = new BoardcastReceiverDetectSystemStatus(this);
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction(ServiceDetectSystemStatus.ACTION_CONNECTIONED);
        intentFilter.addAction(ServiceDetectSystemStatus.ACTION_NO_CONNECTION);
        LocalBroadcastManager.getInstance(this).registerReceiver(boardcastReceiverDetectSystemStatus, intentFilter);

以上就是三个主要步骤, 当然, 后期可以根据需要进行二次封装以及改造. 去耦

官方文档:
https://developer.android.com/reference/android/support/v4/content/LocalBroadcastManager.html