android 广播的方法

最新推荐文章于 2025-07-26 16:22:22 发布

chengf223

最新推荐文章于 2025-07-26 16:22:22 发布

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本文详细介绍了Android中的广播机制，包括如何定义广播Action、Extra及如何发送和接收广播。提供了发送广播的具体实现示例代码，并展示了两种接收广播的方法：通过Context注册接收器以及在AndroidManifest.xml中声明接收器。

依赖包类：

import android.content.Context;
import android.content.BroadcastReceiver;
import android.os.Bundle;
import android.content.Intent;
import android.app.Activity;

发送广播，实现实例如下：

{

public static final String DVB_CHANNEL_SEARCH_BROADCAST_ACTION=
                                                                                 "android.com.dvbbase.action.DVB_CHANNEL_SEARCH_BROADCAST_ACTION";

public static final String DVB_CHANNEL_SEARCH_BROADCAST_EXTR_CMD =
                                                                                "dvb search Broadcast Commod";
public static final String DVB_CHANNEL_SEARCH_BROADCAST_EXTR_PARAM =
                                                                                "dvb search Broadcast Parameter";

public static final String DVB_CHANNEL_SEARCH_DB_CLEARN = "clearn";

public static final String DVB_CHANNEL_SEARCH_BROADCAST_MSG_START = "search start";
public static final String DVB_CHANNEL_SEARCH_BROADCAST_MSG_FINISH = "search finish";

private
void SendBroadcastMassage(int cmd)
{

    String broadcast_cmd = "";
    String broadcast_param = "";

    Intent intent = new Intent();
    intent.setAction(DVB_CHANNEL_SEARCH_BROADCAST_ACTION);
    switch (cmd) {
    case BROADCAST_MSG_SEARCH_START:
   broadcast_cmd = DVB_CHANNEL_SEARCH_BROADCAST_MSG_START;
   broadcast_param = mTvInputId;
   break;
    case BROADCAST_MSG_SEARCH_FINISH:
    {
      int chNum= 0;
      broadcast_cmd = DVB_CHANNEL_SEARCH_BROADCAST_MSG_FINISH;
      if (mdbImpleHandle != null) {
         chNum = mdbImpleHandle.getChannelNumFormDB();
      }
      if((nitScan == 1) && (chNum > 0))
      {
        broadcast_param = DVB_CHANNEL_SEARCH_DB_CLEARN;
      }
      else
      {
        broadcast_param = "";
      }
    }
   break;
    default:
   broadcast_cmd = "";
   broadcast_param = "";
   break;
    }
    intent.putExtra(DVB_CHANNEL_SEARCH_BROADCAST_EXTR_CMD, broadcast_cmd);
    intent.putExtra(DVB_CHANNEL_SEARCH_BROADCAST_EXTR_PARAM, broadcast_param);
    Log.i(TAG, "ChannelScanImpl send broadcast:" + broadcast_cmd + "\n");
    this.sendBroadcast(intent);
}

}

接收广播的方法：

{

private
BroadcastReceiver mBroadcastReceiver = null;

mBroadcastReceiver = new EpgDbImplIntentReceiver();
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(DvbBase.DVB_CHANNEL_SEARCH_BROADCAST_ACTION);
mcontext.registerReceiver(mBroadcastReceiver, intentFilter);

private
class ChannelDbImplIntentReceiver extends BroadcastReceiver
{
    @Override public void onReceive(Context context, Intent intent)
    {
    Message newmsg = null;
    String msgParam;
   String action = intent.getAction();
   Log.i(TAG, "ChannelDbImpl Intent Receiver action = " + action);
   if (action.equals(DVB_CHANNEL_SEARCH_BROADCAST_ACTION)) {
        String msg = intent.getStringExtra(DVB_CHANNEL_SEARCH_BROADCAST_EXTR_CMD);
        if (Objects.equals(msg, DVB_CHANNEL_SEARCH_BROADCAST_MSG_START)) {
       msgParam = intent.getStringExtra(DVB_CHANNEL_SEARCH_BROADCAST_EXTR_PARAM);
       Log.i(TAG, "@@@#### TvInput boroadcase receiver dvb search start;tvinput id:" + msgParam + " \n");
        } else if (Objects.equals(msg, DVB_CHANNEL_SEARCH_BROADCAST_MSG_FINISH)) {
       msgParam = intent.getStringExtra(DVB_CHANNEL_SEARCH_BROADCAST_EXTR_PARAM);
       Log.i(TAG, "@@@#### TvInput boroadcase receiver dvb search stop;db clearn:" + msgParam + " \n");
        }
   }
    }
}