Question

我想动态控制位置跟踪（注册/取消注册位置广播接收器）。这就是我计划这样做的方式。我有两个问题：

下面的实现有什么错误，因为我对android / java dev非常新，所有这个概念对我来说仍然非常理论化。仍然在构建概念！
如何将某个EXTRA_INFO从我的位置库类传递到位置接收器。

实现：

我有一个库类LocationLibrary.java，它由两个方法组成。顾名思义，他们这样做。当我调用startTracking（）时，位置跟踪应该开始。 Plz注意需要传递给myLocationReceiver的extraInfo。当调用stopTracking（）时，跟踪应该停止。

代码段：

public class LocationLibraray
{
    private static BroadcastReceiver myLocationReceiver;

    public LocationLibraray(Context context)
    {
        this.ctx = context;
        myLocationReceiver = new MyLocationReceiver();
    }

    public void startTracking(Context context, String extraInfo)
    {
         IntentFilter filter = new IntentFilter();
         filter.addAction("com.app.android.tracker.LOCATION_READY");
         context.registerReceiver(myLocationReceiver, filter);

        // NEED TO PASS extraInfo to myLocationReceiver for some processing, but HOW?
    }

    public void stopTracking(Context context)
    {
        context.unregisterReceiver(locationReceiver);
    }

}

MyLocationReceiver.java

public class MyLocationReceiver extends BroadcastReceiver  {

    public void onReceive(final Context context, Intent intent) {
        if ((intent.getAction() != null) && 
                (intent.getAction().equals("com.app.android.tracker.LOCATION_READY")))
        {
             //GET THAT EXTRA INFO FROM LocationLibrary class and process it here
        }
    }
}

请帮帮我。日Thnx！

Answer 1

为什么不向MyLocationReceiver添加构造函数？

public class MyLocationReceiver extends BroadcastReceiver {
 String info = "";

 public MyLocationReceiver(String extraInfo)
 {
     this.info = extraInfo;

 }
 ........
 public void onReceive(final Context context, Intent intent) {
     if ((intent.getAction() != null) && 
                (intent.getAction().equals("com.app.android.tracker.LOCATION_READY")))
        {
             if (info.contains("Hi"))
                 //do some stuff
        }
    }


}

你会像这样实例化它：

myLocationReceiver = new MyLocationReceiver(new String("Hello!"));

动态控制位置跟踪的正确方法（注册/取消注册位置广播接收器）

1 个答案: