带有 Fragment 和 FragmentActivity 的 TabHost [英] TabHost with Fragments and FragmentActivity
本文介绍了带有 Fragment 和 FragmentActivity 的 TabHost的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在开发一个 Android 应用程序，我想使用 3 个选项卡进行导航，每个选项卡都使用 Fragment，但我不知道如何创建结构.
I'm working on an Android App and I want to use 3 tabs for navigation using Fragments for each tab, but I don't know how to create the structure for doing it.
我想分别添加每个fragment，因为每个fragment都不一样，但是不知道在FragmentActivity的什么地方添加.
I want to add each fragment separately because each one is different, but I don't know where to add them in FragmentActivity.
我有这些文件.
tabs_layout.xml
tabs_layout.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_height="match_parent"
android:layout_width="match_parent">
<TabHost android:id="@android:id/tabhost"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TabWidget
android:id="@android:id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<FrameLayout
android:id="@+id/tabRateAPet"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
<FrameLayout
android:id="@+id/tabViewMyRates"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
<FrameLayout
android:id="@+id/tabViewGlobalRates"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</FrameLayout>
</LinearLayout>
</TabHost>
</LinearLayout>
TabsMain.java
TabsMain.java
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
public class MainTabsActivity extends FragmentActivity {
public static final String RATE_A_PET = "Rate a Pet";
public static final String MY_RATES = "My Rates";
public static final String GLOBAL_RATES = "Global Rates";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.tabs_layout);
}
}
Tabs.java
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TabHost;
import android.widget.TabHost.OnTabChangeListener;
import android.widget.TabHost.TabSpec;
import android.widget.TextView;
public class Tabs extends Fragment implements OnTabChangeListener {
private static final String TAG = "FragmentTabs";
public static final String RATE_A_PET = "Rate a Pet";
public static final String MY_RATES = "My Rates";
public static final String GLOBAL_RATES = "Global Rates";
private View mRoot;
private TabHost mTabHost;
private int mCurrentTab;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// super.onCreateView(inflater, container, savedInstanceState);
mRoot = inflater.inflate(R.layout.tabs_layout, null);
mTabHost = (TabHost) mRoot.findViewById(android.R.id.tabhost);
setupTabs();
return mRoot;
}
private void setupTabs() {
mTabHost.setup(); // important!
mTabHost.addTab(newTab(RATE_A_PET, R.string.tabRateAPet, R.id.tabRateAPet));
mTabHost.addTab(newTab(MY_RATES, R.string.tabViewMyRates, R.id.tabViewMyRates));
}
private TabSpec newTab(String tag, int labelId, int tabContentId) {
Log.d(TAG, "buildTab(): tag=" + tag);
View indicator = LayoutInflater.from(getActivity()).inflate(
R.layout.tab,
(ViewGroup) mRoot.findViewById(android.R.id.tabs), false);
((TextView) indicator.findViewById(R.id.text)).setText(labelId);
TabSpec tabSpec = mTabHost.newTabSpec(tag);
tabSpec.setIndicator(indicator);
tabSpec.setContent(tabContentId);
return tabSpec;
}
@Override
public void onTabChanged(String tabId) {
Log.d(TAG, "onTabChanged(): tabId=" + tabId);
if (RATE_A_PET.equals(tabId)) {
updateTab(tabId, R.id.tabRateAPet);
mCurrentTab = 0;
return;
}
if (MY_RATES.equals(tabId)) {
updateTab(tabId, R.id.tabViewMyRates);
mCurrentTab = 1;
return;
}
if (GLOBAL_RATES.equals(tabId)) {
updateTab(tabId, R.id.tabViewGlobalRates);
mCurrentTab = 2;
return;
}
}
private void updateTab(String tabId, int placeholder) {
FragmentManager fm = getFragmentManager();
if (fm.findFragmentByTag(tabId) == null) {
fm.beginTransaction()
.replace(placeholder, new RateMyPetActivity(), tabId)
.commit();
}
}
}
推荐答案
我建议为每个选项卡创建一个单独的片段文件.我最近也这样做了，所以我在下面概述了我的代码:
I would suggest creating a separate fragment file for each tab. I recently did this as well, so I have outlined my code below:
布局文件
activity_main.xml
activity_main.xml
<android.support.v4.app.FragmentTabHost
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/tabhost"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TabWidget
android:id="@android:id/tabs"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0"/>
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_weight="0"/>
<FrameLayout
android:id="@+id/realtabcontent"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"/>
</LinearLayout>
</android.support.v4.app.FragmentTabHost>
tab1_view.xml//使用此格式添加各自的选项卡布局(确保更改字符串变量)
tab1_view.xml //add your respective tab layouts using this format (make sure to change string variables)
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".DeviceFragment" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/tab1_fragment_string" />
</LinearLayout>
SRC 文件
MainActivity.java//注意在.addTab 过程中我只使用了文本.您还可以使用需要添加到 hdpi 文件夹的可绘制对象来添加图标.在这个例子中，我也只创建了三个标签.
MainActivity.java //notice that in the .addTab process I only used text. You can also add icons using drawables that you would need to add to your hdpi folder. I also only created three tabs in this example.
package com.example.applicationname;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTabHost;
public class MainActivity extends FragmentActivity {
// Fragment TabHost as mTabHost
private FragmentTabHost mTabHost;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTabHost = (FragmentTabHost)findViewById(android.R.id.tabhost);
mTabHost.setup(this, getSupportFragmentManager(), R.id.realtabcontent);
mTabHost.addTab(mTabHost.newTabSpec("tab1").setIndicator("Tab1"),
Tab1Fragment.class, null);
mTabHost.addTab(mTabHost.newTabSpec("tab2").setIndicator("Tab2"),
Tab2Fragment.class, null);
mTabHost.addTab(mTabHost.newTabSpec("tab3").setIndicator("Tab3"),
Tab3Fragment.class, null);
}
}
Tab1Fragment.java//再次复制所需数量的标签
Tab1Fragment.java //once again replicate for desired number of tabs
package com.example.applicationname;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class Tab1Fragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View V = inflater.inflate(R.layout.tab1_view, container, false);
return V;
}
}
确保您的 R.java 和 strings.xml 文件设置正确，然后您的选项卡应该启动并运行.
Make sure that your R.java and strings.xml files are properly set up, and then your tabs should be up and running.
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