如何获得该片段已被选择 [英] How to get which fragment has been selected

问题描述

我创建一个标签应用程序，使用的片段。

我已经成功地创建标签，但现在我需要在选择一个特定的片段来创建一个对象。例如当我选择 [设定] 我需要调用是在测试类定义的函数。同样摧毁

  //设定]
包com.example.sensorspositioningn;进口android.app.Fragment;
进口android.os.Bundle;
进口android.view.LayoutInflater;
进口android.view.View;
进口android.view.ViewGroup;公共类[设定扩展片段{    公共查看onCreateView（LayoutInflater充气器，容器的ViewGroup，捆绑savedInstanceState）{
        //充气的布局该片段
        返回inflater.inflate（R.layout.settingstab，集装箱，FALSE）;    }
}
 

下面是mainActivity的code：

 保护无效的onCreate（捆绑savedInstanceState）{
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.activity_main）;
        appContext = getApplicationContext（）;        //动作条
        动作条动作条= getActionBar（）;
        actionbar.setNavigationMode（ActionBar.NAVIGATION_MODE_TABS）;        ActionBar.Tab TAB1 = actionbar.newTab（）的setText（TAB1）;
        ActionBar.Tab TAB2 = actionbar.newTab（）的setText（TAB2）;
        ActionBar.Tab TAB3 = actionbar.newTab（）的setText（TAB3）;
        ActionBar.Tab设定] = actionbar.newTab（）的setText（设置）。        片段Tab1F =新TAB1（）;
        片段Tab2F =新TAB2（）;
        片段Tab3F =新TAB3（）;
        片段mSettingsFragment =新设定]（）;        Tab1.setTabListener（新MyTabsListener（Tab1F））;
        Tab1.setTabListener（新MyTabsListener（Tab2F））;
        Tab1.setTabListener（新MyTabsListener（Tab3F））;
        SettingsTab.setTabListener（新MyTabsListener（mSettingsFragment））;        actionbar.addTab（TAB1）;
        actionbar.addTab（TAB2）;
        actionbar.addTab（TAB3）;
        actionbar.addTab（设定]）;
    }
保护无效的onSaveInstanceState（捆绑outState）{
        super.onSaveInstanceState（outState）;
        outState.putInt（标签，getActionBar（）getSelectedNavigationIndex（））;
    }类MyTabsListener实现ActionBar.TabListener {
        公共片段片段;        公共MyTabsListener（片段片段）{
            this.fragment =片段;
        }
        公共无效onTabReselected（标签选项卡，FragmentTransaction英尺）{
            Toast.makeText（MainActivity.appContext，！复选，Toast.LENGTH_LONG）.show（）;
        }
        公共无效onTabSelected（标签选项卡，FragmentTransaction英尺）{
            ft.replace（R.id.fragment_container，片段）;
        }
        公共无效onTabUnselected（标签选项卡，FragmentTransaction英尺）{
            ft.remove（片段）;
        }
    }
 

解决方案

在你的 ActionBar.TabListener 你可以这样做 - （我假设你所需要的对象要在活动）

 类MyTabsListener实现ActionBar.TabListener {
    公共片段片段;    公共MyTabsListener（片段片段）{
        this.fragment =片段;
    }
    公共无效onTabReselected（标签选项卡，FragmentTransaction英尺）{
        Toast.makeText（MainActivity.appContext，！复选，Toast.LENGTH_LONG）.show（）;
    }
    公共无效onTabSelected（标签选项卡，FragmentTransaction英尺）{
        ft.replace（R.id.fragment_container，片段）;        如果（片段的instanceof设定]）{
            //创建你的对象，调用你的函数
        }
    }
    公共无效onTabUnselected（标签选项卡，FragmentTransaction英尺）{
        ft.remove（片段）;        如果（片段的instanceof设定]）{
            //销毁你的对象
        }
    }
}
 

I am creating a tab application, using fragments.

I have successfully created tabs, but now I need to create an object when a specific fragment is selected. e.g. When I select SettingsTab I need to call a function that is defined in Test class. and similarly destroy

// SettingsTab
package com.example.sensorspositioningn;

import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class SettingsTab extends Fragment {

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.settingstab, container, false);

    }
}

Here is the code in mainActivity:

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        appContext = getApplicationContext();

        //ActionBar
        ActionBar actionbar = getActionBar();
        actionbar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        ActionBar.Tab Tab1= actionbar.newTab().setText("Tab1");
        ActionBar.Tab Tab2= actionbar.newTab().setText("Tab2");
        ActionBar.Tab Tab3= actionbar.newTab().setText("Tab3");
        ActionBar.Tab SettingsTab = actionbar.newTab().setText("Settings");

        Fragment Tab1F= new Tab1();
        Fragment Tab2F= new Tab2();
        Fragment Tab3F= new Tab3();
        Fragment mSettingsFragment = new SettingsTab();

        Tab1.setTabListener(new MyTabsListener(Tab1F));
        Tab1.setTabListener(new MyTabsListener(Tab2F));
        Tab1.setTabListener(new MyTabsListener(Tab3F));
        SettingsTab.setTabListener(new MyTabsListener(mSettingsFragment));

        actionbar.addTab(Tab1);
        actionbar.addTab(Tab2);
        actionbar.addTab(Tab3);
        actionbar.addTab(SettingsTab);


    }
protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putInt("tab", getActionBar().getSelectedNavigationIndex());
    }

class MyTabsListener implements ActionBar.TabListener {
        public Fragment fragment;

        public MyTabsListener(Fragment fragment) {
            this.fragment = fragment;
        }


        public void onTabReselected(Tab tab, FragmentTransaction ft) {
            Toast.makeText(MainActivity.appContext, "Reselected!", Toast.LENGTH_LONG).show();
        }


        public void onTabSelected(Tab tab, FragmentTransaction ft) {
            ft.replace(R.id.fragment_container, fragment);




        }


        public void onTabUnselected(Tab tab, FragmentTransaction ft) {
            ft.remove(fragment);


        }
    }

解决方案

In your ActionBar.TabListener you can do this - (I'm assuming that you need the object to be in the Activity)

class MyTabsListener implements ActionBar.TabListener {
    public Fragment fragment;

    public MyTabsListener(Fragment fragment) {
        this.fragment = fragment;
    }


    public void onTabReselected(Tab tab, FragmentTransaction ft) {
        Toast.makeText(MainActivity.appContext, "Reselected!", Toast.LENGTH_LONG).show();
    }


    public void onTabSelected(Tab tab, FragmentTransaction ft) {
        ft.replace(R.id.fragment_container, fragment);

        if(fragment instanceof SettingsTab) {
            // Create your object, call your function
        }
    }


    public void onTabUnselected(Tab tab, FragmentTransaction ft) {
        ft.remove(fragment);

        if(fragment instanceof SettingsTab) {
            // Destroy your object
        }
    }
}

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