【Android】BroadCast用法简示

超、凢脫俗 2022-08-28 02:53 216阅读 0赞

### BroadCast用法简示 ###

*  How To Use

`注册`

val intentFilter = IntentFilter()
    intentFilter.addAction(BroadcastActionConstants.MQTT_UPDATE)
    intentFilter.addAction(BroadcastActionConstants.RELEASE)
    intentFilter.addAction(BroadcastActionConstants.MQTT_PERSONIMAGE_FAIL)
    ConstantsConfig.getContext().registerReceiver(mqttReceiver, intentFilter)

public class BroadcastActionConstants {//Java
    
       ...
    
        //mqtt 人像下发失败通知
        public static final String MQTT_PERSONIMAGE_FAIL = "android.intent.action.MQTT_person_img_fail";
    }

`接收`

private val mqttReceiver = object : BroadcastReceiver() {
            override fun onReceive(context: Context?, intent: Intent?) {
                intent?.let {
                    val action = it.action
                    clientId = DeviceUtils.getSerialNumber()
                    when (action) {
                        BroadcastActionConstants.MQTT_UPDATE -> {
                            //逻辑
                        }
                        BroadcastActionConstants.MQTT_PERSONIMAGE_FAIL -> {
                            //publish(intent.getStringExtra("topic")!!, intent.getStringExtra("msg")!!)
                            //逻辑
                        }
                        BroadcastActionConstants.RELEASE -> {
                            //stopSelf()
                            //逻辑
                        }
                    }
                }
            }
        }

`发送`

Intent intent = new Intent(BroadcastActionConstants.MQTT_PERSONIMAGE_FAIL);
    intent.putExtra("topic","/v1/up/personIssuedStatus/");
    intent.putExtra("msg",json);
    ConstantsConfig.getContext().sendBroadcast(intent);

> For Example: 监听系统时间改变广播

//开启广播
    IntentFilter intentFilter = new IntentFilter();
    intentFilter.addAction(Intent.ACTION_TIME_TICK);
    intentFilter.addAction(Intent.ACTION_TIME_CHANGED);
    registerReceiver(timeReceiver, intentFilter);

timeReceiver

//region #observer os time
    private final BroadcastReceiver timeReceiver = new BroadcastReceiver() {
    	@Override
        public void onReceive(Context context, Intent intent) {
        	if (intent != null) {
            	switch (intent.getAction()) {
                	case Intent.ACTION_TIME_TICK:
                    	if (isTimeIntegerPoint()) {
    						//逻辑
    					break;
    				case Intent.ACTION_TIME_CHANGED:
                    		//逻辑
    					break;
    			}
    		}
    	}
    };
    
    //是否为整点数
    private Boolean isTimeIntegerPoint() {
    	String date = DateUtil.formatDateToString(new Date(), DateUtil.format_hhmm);//12:00
        if (date != null) {
        	String strMinute = date.split(":")[1];
            return strMinute.equals("00") || strMinute.equals("30");
    	} else {
        	return false;
    	}
    }
    //endregion