如何引用子活​​动从TabHost调用公共职能？ [英] How to reference child activity from TabHost to call a public function?

问题描述

我有两个孩子的活动TabHost它（两片）。我也是在这些活动中，我想从我的父母（TabHost）来调用，触发选项卡中的某些行为之一的执行公共职能。

是否有可能引用了活动本身从TabHost调用公共职能？

感谢

这是我的tabhost设置：

  RES = getResources（）;
    tabHost = getTabHost（）;

    TabHost.TabSpec规范;
    意向意图;

    意图=新的意图（）setClass（这一点，home.class）。
    规格= tabHost.newTabSpec（家）setIndicator（组，res.getDrawable（R.drawable.groups））setContent（意向）。
    tabHost.addTab（规范）;
    意图=新的意图（）setClass（这一点，messages.class）。
    规格= tabHost.newTabSpec（信息）setIndicator（信息，res.getDrawable（R.drawable.messages））setContent（意向）。
    tabHost.addTab（规范）;
 

解决方案

我的做法是将其延伸的BroadcastReceiver的子活动定义一个嵌套的监听类。

然后，我会简单地播放从我TabActivity一个Intent这将随后触发的BroadcastReceiver要执行的操作。

编辑：：要举个例子code ...

的步骤...

1. 定义的意图过滤器在清单
2. 添加嵌套的听众的子活动
3. 设置onResume（）/的onPause（）的子活动注册/注销监听器
4. 在TabActivity创建意图和播放它时，你想要孩子做一些事情

在AndroidManifest.xml中

 ＆LT;活动
    机器人：MyActivityNAME =
    机器人：标签=@字符串/ APP_NAME
    ＆LT;意向滤光器＆gt;
        ＆lt;作用机器人：名称=com.mycompany.myApp.DO_SOMETHING/＆GT;
    ＆所述; /意图滤光器＆gt;
＆LT; /活性GT;
 

在MyActivity.java

 公共类MyActivity延伸活动{

    私人myListener的侦听器= NULL;
    私人布尔MyListenerIsRegistered = FALSE;

    @覆盖
    公共无效的onCreate（包savedInstanceState）{
        super.onCreated（savedInstanceState）;

        监听=新myListener的（）;
    }

    @覆盖
    保护无效onResume（）{
        super.onResume（）;

        如果（！MyListenerIsRegistered）{
            registerReceiver（监听器，新的IntentFilter（com.mycompany.myApp.DO_SOMETHING））;
            MyListenerIsRegisterd = TRUE;
        }
    }

    @覆盖
    保护无效的onPause（）{
        super.onPause（）;

        如果（MyListenerIsRegistered）{
            unregisterReceiver（听众）;
            MyListenerIsRegistered = FALSE;
        }
    }

    //嵌套的'听众'
    保护类myListener的扩展BroadcastReceiver的{

        @覆盖
        公共无效的onReceive（上下文的背景下，意图意图）{

            //不需要检查，除非监听动作将
            //将处理超过一个 - 让我们做吧
            如果（intent.getAction（）。等于（com.mycompany.myApp.DO_SOMETHING））{
                // 做一点事
            }
        }
    }
}
 

在主TabActivity

 私人无效MakeChildDoSomething（）{

    意图I =新意图（）;
    i.setAction（com.mycompany.myApp.DO_SOMETHING）;
    sendBroadcast（ⅰ）;
}
 

I have a TabHost with two child activities in it (in two tabs). I also implemented a public function in one of these activities that i would like to call from my parent (TabHost), to trigger some action within the tab.

Is it possible to reference the activity itself from the TabHost to call a public function?

Thanks

here is my tabhost setup:

    res = getResources(); 
    tabHost = getTabHost(); 

    TabHost.TabSpec spec; 
    Intent intent;  

    intent = new Intent().setClass(this, home.class);
    spec = tabHost.newTabSpec("home").setIndicator("Groups", res.getDrawable(R.drawable.groups)).setContent(intent);
    tabHost.addTab(spec);
    intent = new Intent().setClass(this, messages.class);
    spec = tabHost.newTabSpec("messages").setIndicator("Messages", res.getDrawable(R.drawable.messages)).setContent(intent);    
    tabHost.addTab(spec);

解决方案

My approach would be to define a nested 'listener' class in the child activity which extends BroadcastReceiver.

I would then simply broadcast an Intent from my TabActivity which would then trigger the BroadcastReceiver to perform the action.

EDIT: To give example code...

The steps are...

1. Define the intent filter in the manifest
2. Add the nested 'listener' to the child activity
3. Set onResume()/onPause() in child activity to register/unregister the listener
4. Create intent in TabActivity and broadcast it when you want child to do something

In AndroidManifest.xml

<activity
    android:name=".MyActivity"
    android:label="@string/app_name"
    <intent-filter>
        <action android:name="com.mycompany.myApp.DO_SOMETHING" />
    </intent-filter>
</activity>

In MyActivity.java

public class MyActivity extends Activity {

    private MyListener listener = null;
    private Boolean MyListenerIsRegistered = false;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreated(savedInstanceState);

        listener = new MyListener();
    }

    @Override
    protected void onResume() {
        super.onResume();

        if (!MyListenerIsRegistered) {
            registerReceiver(listener, new IntentFilter("com.mycompany.myApp.DO_SOMETHING"));
            MyListenerIsRegisterd = true;
        }
    }

    @Override
    protected void onPause() {
        super.onPause();

        if (MyListenerIsRegistered) {
            unregisterReceiver(listener);
            MyListenerIsRegistered = false;
        }
    }

    // Nested 'listener'
    protected class MyListener extends BroadcastReceiver {

        @Override
        public void onReceive(Context context, Intent intent) {

            // No need to check for the action unless the listener will
            // will handle more than one - let's do it anyway
            if (intent.getAction().equals("com.mycompany.myApp.DO_SOMETHING")) {
                // Do something
            }
        }
    }
}

In the main TabActivity

private void MakeChildDoSomething() {

    Intent i = new Intent();
    i.setAction("com.mycompany.myApp.DO_SOMETHING");
    sendBroadcast(i);
}

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