所谓的心跳查询

public class QueryManager {
    private static Context context;
    private static Intent intent;
    private static boolean stopFlag;
    private static Runnable runnableQueryService;
    private static Handler queryHandler;

queryHandler .postDelayed(runnableQueryService, dylaySeconds*1000);//第一次调用延迟

queryHandler = new Handler(){
    @Override
    public void handleMessage(Message msg) {
        super.handleMessage(msg);
        String strJson = msg.getData().getString("data");
        processServiceQueryData(strJson);
        if(!stopFlag) {
            queryHandler.postDelayed(runnableQueryService, 20 * 1000);
        }
    }
};

QueryNewCountManager.runnableQueryService = new Runnable(){
    @Override
    public void run() {//调用服务进行一次查询
        Intent intent = new Intent(context, QueryService.class);
        if(queryHandler == null){
            return;
        }
        QueryService.setHandler(queryHandler);
        context.startService(intent);
    }
};

QueryNewCountManager.intent = new Intent(context, QueryFireCountService.class);

(handler)queryHandler --> (runnable)runnableQueryService --> (service)QueryService（带上queryHandler，查询完后，sendmessage 给 queryHandler)

queryHandler处理QueryService发来的service。然后重新调用runnableQueryService 。

如此反复进行心跳查询。

所谓的心跳查询

原文：http://www.cnblogs.com/lizia/p/4769364.html