教程实现用TabHost在安卓2.2 + ViewPager和片段 [英] Tutorial to implement the use of TabHost in Android 2.2 + ViewPager and Fragments
本文介绍了教程实现用TabHost在安卓2.2 + ViewPager和片段的处理方法，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
有一个简短的教程的人喜欢我，谁遇到了一些麻烦找到一种方法来实现TabHost和ViewPager，包括页面刷卡用手指选项卡中单击更改网页。所显示的解决方案是采用Android版本2.2 +兼容。
A short tutorial for people like me who had some trouble finding a way to implement TabHost and ViewPager, including page swiping with fingers and tab click to change pages. The shown solution is compatible with Android versions 2.2+.
它包括标签初始化，ViewPager有标签和页面滚动管理连接。
It includes Tabs initialization, ViewPager connected with Tabs and Page Scrolling management.
它的主要特点是优化早期版本的Android（Froyo的，API版本8，Android 2.2的）和简单实现不同的目的。
Its main peculiarity is the optimization for earlier versions of Android (FROYO, API version 8, Android 2.2) and the simple implementation for different purposes.
我希望这将是有益的。
推荐答案
本教程包括4类和2的布局。它已经过测试与Android手机2.2，你可以只复制和;粘贴来试试吧。
The tutorial includes 4 classes and 2 layouts. It has been tested with an Android Phone 2.2 and you can just copy & paste to try it.
本教程是开放的意见和放大器;改进！
This tutorial is open to comments & improvements!
MainActivity.java （主要活动）：
package samples.tabhost.andreaoid.net;
import java.util.ArrayList;
import java.util.List;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.widget.TabHost;
import android.widget.TabHost.OnTabChangeListener;
public class MainActivity extends FragmentActivity implements OnTabChangeListener, OnPageChangeListener {
MyPageAdapter pageAdapter;
private ViewPager mViewPager;
private TabHost mTabHost;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mViewPager = (ViewPager) findViewById(R.id.viewpager);
// Tab Initialization
initialiseTabHost();
// Fragments and ViewPager Initialization
List<Fragment> fragments = getFragments();
pageAdapter = new MyPageAdapter(getSupportFragmentManager(), fragments);
mViewPager.setAdapter(pageAdapter);
mViewPager.setOnPageChangeListener(MainActivity.this);
}
// Method to add a TabHost
private static void AddTab(MainActivity activity, TabHost tabHost, TabHost.TabSpec tabSpec) {
tabSpec.setContent(new MyTabFactory(activity));
tabHost.addTab(tabSpec);
}
// Manages the Tab changes, synchronizing it with Pages
public void onTabChanged(String tag) {
int pos = this.mTabHost.getCurrentTab();
this.mViewPager.setCurrentItem(pos);
}
@Override
public void onPageScrollStateChanged(int arg0) {
}
// Manages the Page changes, synchronizing it with Tabs
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
int pos = this.mViewPager.getCurrentItem();
this.mTabHost.setCurrentTab(pos);
}
@Override
public void onPageSelected(int arg0) {
}
private List<Fragment> getFragments(){
List<Fragment> fList = new ArrayList<Fragment>();
// TODO Put here your Fragments
MySampleFragment f1 = MySampleFragment.newInstance("Sample Fragment 1");
MySampleFragment f2 = MySampleFragment.newInstance("Sample Fragment 2");
MySampleFragment f3 = MySampleFragment.newInstance("Sample Fragment 3");
fList.add(f1);
fList.add(f2);
fList.add(f3);
return fList;
}
// Tabs Creation
private void initialiseTabHost() {
mTabHost = (TabHost) findViewById(android.R.id.tabhost);
mTabHost.setup();
// TODO Put here your Tabs
MainActivity.AddTab(this, this.mTabHost, this.mTabHost.newTabSpec("Tab1").setIndicator("Tab1"));
MainActivity.AddTab(this, this.mTabHost, this.mTabHost.newTabSpec("Tab2").setIndicator("Tab2"));
MainActivity.AddTab(this, this.mTabHost, this.mTabHost.newTabSpec("Tab3").setIndicator("Tab3"));
mTabHost.setOnTabChangedListener(this);
}
}
MyPageAdapter.java （片段经理）：
package samples.tabhost.andreaoid.net;
import java.util.List;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
public class MyPageAdapter extends FragmentPagerAdapter {
private List<Fragment> fragments;
public MyPageAdapter(FragmentManager fm, List<Fragment> fragments) {
super(fm);
this.fragments = fragments;
}
@Override
public Fragment getItem(int position) {
return this.fragments.get(position);
}
@Override
public int getCount() {
return this.fragments.size();
}
}
MyTabFactory （制表经理）：
package samples.tabhost.andreaoid.net;
import android.content.Context;
import android.view.View;
import android.widget.TabHost.TabContentFactory;
public class MyTabFactory implements TabContentFactory {
private final Context mContext;
public MyTabFactory(Context context) {
mContext = context;
}
public View createTabContent(String tag) {
View v = new View(mContext);
v.setMinimumWidth(0);
v.setMinimumHeight(0);
return v;
}
}
MySampleFragment.java （单片段 - 包括用于演示）：
MySampleFragment.java (the single fragment - included for demonstration purposes):
package samples.tabhost.andreaoid.net;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class MySampleFragment extends Fragment {
private static View mView;
public static final MySampleFragment newInstance(String sampleText) {
MySampleFragment f = new MySampleFragment();
Bundle b = new Bundle();
b.putString("bString", sampleText);
f.setArguments(b);
return f;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
mView = inflater.inflate(R.layout.sample_fragment, container, false);
String sampleText = getArguments().getString("bString");
TextView txtSampleText = (TextView) mView.findViewById(R.id.txtViewSample);
txtSampleText.setText(sampleText);
return mView;
}
}
activity_main.xml
<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<TabHost
android:id="@android:id/tabhost"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TabWidget
android:id="@android:id/tabs"
android:orientation="horizontal"
android:layout_width="fill_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" />
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom" />
</LinearLayout>
</TabHost>
</RelativeLayout>
sample_fragment.xml （你可以把这里的片段布局）：
sample_fragment.xml (you can put here your fragment layout):
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/txtViewSample"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:text="" />
</RelativeLayout>
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