Android 使用registerReceiver注册BroadcastReceiver案例详解

public Intent registerReceiver (BroadcastReceiver receiver, IntentFilter filter) 

private SDStateMonitorReceiver sdStateReceiver; //SDcard状态监测
private LogTaskReceiver logTaskReceiver;

private static String MONITOR_LOG_SIZE_ACTION = "MONITOR_LOG_SIZE";        //日志文件监测action
private static String SWITCH_LOG_FILE_ACTION = "SWITCH_LOG_FILE_ACTION";    //切换日志文件action

private final int SDCARD_TYPE = 0;            //当前的日志记录类型为存储在SD卡下面
private final int MEMORY_TYPE = 1;            //当前的日志记录类型为存储在内存中
private int CURR_LOG_TYPE = SDCARD_TYPE;    //当前的日志记录类型

private void register(){
    IntentFilter sdCarMonitorFilter = new IntentFilter();
    sdCarMonitorFilter.addAction(Intent.ACTION_MEDIA_MOUNTED);
    sdCarMonitorFilter.addAction(Intent.ACTION_MEDIA_UNMOUNTED);
    sdCarMonitorFilter.addDataScheme("file");
    sdStateReceiver = new SDStateMonitorReceiver();
    registerReceiver(sdStateReceiver, sdCarMonitorFilter);
    
    IntentFilter logTaskFilter = new IntentFilter();
    logTaskFilter.addAction(MONITOR_LOG_SIZE_ACTION);
    logTaskFilter.addAction(SWITCH_LOG_FILE_ACTION);
    logTaskReceiver = new LogTaskReceiver();
    registerReceiver(logTaskReceiver,logTaskFilter);
}

/**
 * 监控SD卡状态
 */
class SDStateMonitorReceiver extends BroadcastReceiver{
    public void onReceive(Context context, Intent intent) {
        
        if(Intent.ACTION_MEDIA_UNMOUNTED.equals(intent.getAction())){    //存储卡被卸载
            if(CURR_LOG_TYPE == SDCARD_TYPE){
                Log.d(TAG, "SDcar is UNMOUNTED");
                CURR_LOG_TYPE = MEMORY_TYPE;
                new LogCollectorThread().start();
            }
        }else{                                                            //存储卡被挂载
            if(CURR_LOG_TYPE == MEMORY_TYPE){
                Log.d(TAG, "SDcar is MOUNTED");
                CURR_LOG_TYPE = SDCARD_TYPE;
                new LogCollectorThread().start();
                
            }
        }
    }
}

/**
 * 日志任务接收
 * 切换日志，监控日志大小
 */
class LogTaskReceiver extends BroadcastReceiver{
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if(SWITCH_LOG_FILE_ACTION.equals(action)){
            new LogCollectorThread().start();
        }else if(MONITOR_LOG_SIZE_ACTION.equals(action)){
            checkLogSize();
        }
    }
}

unregisterReceiver(sdStateReceiver);
unregisterReceiver(logTaskReceiver);