如何在每个活动中保持标签可见

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【中文标题】如何在每个活动中保持标签可见【英文标题】：how to keep tabs visible on every activity 【发布时间】：2013-07-28 21:33:38 【问题描述】：

我对 android 编程非常陌生，我正在尝试使用片段来实现选项卡。 我正在使用这个Tutorial。一切顺利，但我的问题是我想打开一个新活动，并且在这个新活动上我想保留标签栏。我希望在选项卡内打开的每个新活动上都可以看到选项卡栏。我有以下代码..

public class Tab1Fragment extends Fragment 
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) 
    if (container == null) 
        return null;
    
    LinearLayout theLayout = (LinearLayout) inflater.inflate(
            R.layout.tab_frag1_layout, container, false);
    // Register for the Button.OnClick event
    Button b = (Button) theLayout.findViewById(R.id.btn_startActivity);
    b.setOnClickListener(new View.OnClickListener() 

        @Override
        public void onClick(View v) 
            Toast.makeText(Tab1Fragment.this.getActivity(),
                    "open new activity with tab bar", Toast.LENGTH_LONG).show();
            //Here I want to start new activity with tab bar
        
    );
    return theLayout;
    // return (LinearLayout)inflater.inflate(R.layout.tab_frag1_layout,
    // container, false);

【问题讨论】：

我猜，当点击按钮 btn_startActivity 时，新的 Activity 会全屏打开并且没有实现 TAB 控件，这些控件已经在 Tab1Fragment 中实现了 - 对吧？ 我没有确切的答案，但您可能希望将所有活动转换为片段。这可能会给你你想要的。 嗨，GOODY，是的，你是对的。新活动打开时没有标签。 嗨 Shobhit，你能解释一下你想说什么吗？ 【参考方案1】：

这是主要活动。

  package com.example.tabs;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.TabHost;
import android.widget.TabHost.OnTabChangeListener;
import android.widget.TextView;

import com.actionbarsherlock.app.SherlockFragmentActivity;
import com.actionbarsherlock.sample.fragments.R;

public class FragmentTabs extends SherlockFragmentActivity implements FragmentChangeListener
    
private TabHost mTabHost;
    private int mContainerId;
    private FragmentTransaction fragmentTransaction;
    private FragmentManager fragmentManager;

private View tabIndicator1;
private View tabIndicator2;
private View tabIndicator3;

@Override
protected void onCreate(final Bundle savedInstanceState) 

    super.onCreate(savedInstanceState);
    setContentView(R.layout.fragment_tabs);

    mTabHost = (TabHost)findViewById(android.R.id.tabhost);
    mTabHost.setup();        
    mContainerId=R.id.realtabcontent;
    fragmentManager = getSupportFragmentManager();

    tabIndicator1 = LayoutInflater.from(this).inflate(R.layout.tab, mTabHost.getTabWidget(), false);
    tabIndicator2 = LayoutInflater.from(this).inflate(R.layout.tab, mTabHost.getTabWidget(), false);
    tabIndicator3 = LayoutInflater.from(this).inflate(R.layout.tab, mTabHost.getTabWidget(), false);

    TextView tv1=(TextView)tabIndicator1.findViewById(R.id.txt);
    TextView tv2=(TextView)tabIndicator2.findViewById(R.id.txt);
    TextView tv3=(TextView)tabIndicator3.findViewById(R.id.txt);

    tv1.setText("Tab1");
    tv2.setText("Tab2");
    tv3.setText("Tab3");   

    mTabHost.addTab(mTabHost.newTabSpec("1")
            .setContent(new DummyTabFactory(this))
            .setIndicator(tabIndicator1)
            );

    mTabHost.addTab(mTabHost.newTabSpec("2")
            .setContent(new DummyTabFactory(this))
            .setIndicator(tabIndicator2)
            );

    mTabHost.addTab(mTabHost.newTabSpec("3")
            .setContent(new DummyTabFactory(this))
            .setIndicator(tabIndicator3)
            );

    mTabHost.setOnTabChangedListener(new OnTabChangeListener() 
       
        @Override
        public void onTabChanged(String selectedTabID) 
        
            int tabIndex=Integer.valueOf(selectedTabID);

            switch(tabIndex)
            
                case 1:
                    selectedTabID= tabIndicator1.getTag()==null?"Fragment1":tabIndicator1.getTag().toString();
                    break;

                case 2:
                    selectedTabID= tabIndicator2.getTag()==null?"Fragment2":tabIndicator2.getTag().toString();
                    break;

                case 3:
                    selectedTabID= tabIndicator3.getTag()==null?"Fragment3":tabIndicator3.getTag().toString();
                    break;
            ;

            Fragment fragment=fragmentManager.findFragmentByTag(selectedTabID);     

            if(fragment==null)
            
                fragment=getFragment(selectedTabID);
                     
            replaceFragment(fragment,selectedTabID);
        
    );      

    renderDefaultTab();
    

public void clickMe(final View view)

    Fragment fragment=new AnotherFragment();
    replaceFragment(fragment,"AnotherFragment");


@Override
public void replaceFragment(final Fragment fragment, final String tag) 

    fragmentTransaction = fragmentManager.beginTransaction(); 
    fragmentTransaction.replace(mContainerId, fragment,tag);
    fragmentTransaction.addToBackStack(tag);
    fragmentTransaction.commit();


public void renderDefaultTab()

    Fragment fragment=getFragment("Fragment1");
    replaceFragment(fragment,"Fragment1");


public Fragment getFragment(final String tag)

    Fragment fragment=null;
    if(tag.equalsIgnoreCase("Fragment1"))
        fragment=new Fragment1();
    else if(tag.equalsIgnoreCase("Fragment2"))
        fragment=new Fragment2();
    else if(tag.equalsIgnoreCase("Fragment3"))
        fragment=new Fragment3();

    return fragment;


@Override
public void addToTab1Navigation(final String tag) 

    tabIndicator1.setTag(tag);


@Override
public void addToTab2Navigation(final String tag) 
   
    tabIndicator2.setTag(tag);


@Override
public void addToTab3Navigation(final String tag) 
   
    tabIndicator3.setTag(tag);


@Override
public void onBackPressed() 
       
    String name=fragmentManager.getBackStackEntryAt(fragmentManager.getBackStackEntryCount()-1).getName();

    Fragment fragment=fragmentManager.findFragmentByTag(name);

    if(fragment instanceof BaseFragment)
        String tag=((BaseFragment)fragment).getPreceddingFragmentTag();
        if(tag.equalsIgnoreCase("exit"))
            System.exit(0);
        else
        
            fragment=fragmentManager.findFragmentByTag(tag);
            replaceFragment(fragment, tag);

以及此 MainActivity 的布局。

     <?xml version="1.0" encoding="utf-8"?>

<TabHost
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/tabhost"
    android:layout_
    android:layout_>

    <LinearLayout
        android:orientation="vertical"
        android:layout_
        android:layout_>

    <FrameLayout
            android:id="@android:id/tabcontent"
            android:layout_
            android:layout_
            android:layout_weight="0"/>

      <FrameLayout
            android:id="@+android:id/realtabcontent"
            android:layout_
            android:layout_
            android:layout_weight="1"/>

        <TabWidget
            android:id="@android:id/tabs"
            android:orientation="horizontal"
            android:layout_
            android:layout_
            android:layout_weight="0"
            android:layout_gravity="bottom"/>

    </LinearLayout>
</TabHost>

片段1：

    package com.example.tabs;

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.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import com.actionbarsherlock.sample.fragments.R;

public class Fragment1 extends BaseFragment
   
    @Override
    public void onCreate(final Bundle savedInstanceState) 
    
        super.onCreate(savedInstanceState);
    

    public String toString()
        return "Fragment1";
    

    @Override
    public View onCreateView(final LayoutInflater inflater, final ViewGroup container, final Bundle savedInstanceState) 
    
        View view=inflater.inflate(R.layout.fragment1, container, false);   
        return view;
    

    @Override
    public void onViewCreated(final View view, final Bundle savedInstanceState) 
    
        super.onViewCreated(view, savedInstanceState);
        CustomAdapter adapt=new CustomAdapter(getActivity(),0);
        ListView lv=(ListView)view.findViewById(R.id.mylistview);
        lv.setAdapter(adapt);

        FragmentChangeListener fc=(FragmentChangeListener)getActivity();
        fc.addToTab1Navigation(this.toString());


        lv.setOnItemClickListener(new OnItemClickListener()
        
            @Override public void onItemClick(final AdapterView<?> arg0, final View arg1, final int position, final long arg3)
             
                Fragment fr=new CustomFragment();
                Bundle bundle=new Bundle();
                bundle.putString("response", "Option "+(position+1));
                fr.setArguments(bundle);
                FragmentChangeListener fc=(FragmentChangeListener)getActivity();
                fc.replaceFragment(fr,"CustomFragment");
            
        );
    

    @Override
    public String getPreceddingFragmentTag() 
    
        return "exit";

片段2：

    package com.example.tabs;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.actionbarsherlock.sample.fragments.R;

public class Fragment2 extends BaseFragment
   
    @Override
    public void onCreate(final Bundle savedInstanceState) 
    
        super.onCreate(savedInstanceState);
    

    public String toString()
        return "Fragment2";
    

    @Override
    public View onCreateView(final LayoutInflater inflater, final ViewGroup container, final Bundle savedInstanceState) 
    
        View view=inflater.inflate(R.layout.fragment2, container, false);   

        FragmentChangeListener fc=(FragmentChangeListener)getActivity();
        fc.addToTab2Navigation(this.toString());

        return view;
    

    @Override
    public String getPreceddingFragmentTag()
    
        return "exit";

片段3：

    package com.example.tabs;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.actionbarsherlock.sample.fragments.R;

public class Fragment3 extends BaseFragment
   
    @Override
    public void onCreate(final Bundle savedInstanceState) 
    
        super.onCreate(savedInstanceState);
    

    public String toString()
        return "Fragment3";
    


    @Override
    public View onCreateView(final LayoutInflater inflater, final ViewGroup container, final Bundle savedInstanceState) 
    
        View view=inflater.inflate(R.layout.fragment3, container, false);   

        FragmentChangeListener fc=(FragmentChangeListener)getActivity();
        fc.addToTab3Navigation(this.toString());

        return view;
    

    @Override
    public String getPreceddingFragmentTag() 
    
        return "exit";

FragmentChangeListener 接口。

    package com.example.tabs;

import android.support.v4.app.Fragment;

public interface FragmentChangeListener 

    public void replaceFragment(final Fragment fragment, final String tag); 
    public void addToTab1Navigation(String tag);
    public void addToTab2Navigation(String tag);
    public void addToTab3Navigation(String tag);

DummyTabFactory：

    package com.example.tabs;

import android.content.Context;
import android.view.View;
import android.widget.TabHost;

class DummyTabFactory implements TabHost.TabContentFactory 

    private final Context mContext;

    public DummyTabFactory(final Context context) 
    
        mContext = context;
    

    @Override
    public View createTabContent(final String tag) 
    
        View v = new View(mContext);
        v.setMinimumWidth(0);
        v.setMinimumHeight(0);
        return v;

自定义片段：

    package com.example.tabs;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import com.actionbarsherlock.sample.fragments.R;

public class CustomFragment extends BaseFragment
   
    @Override
    public void onCreate(final Bundle savedInstanceState) 
    
        super.onCreate(savedInstanceState);
    

    public String toString()
        return "CustomFragment";
    

    @Override
    public View onCreateView(final LayoutInflater inflater, final ViewGroup container, final Bundle savedInstanceState) 
    
        FragmentChangeListener fc=(FragmentChangeListener)getActivity();
        fc.addToTab1Navigation(this.toString());

        View view=inflater.inflate(R.layout.custom_fragment, container, false); 
        TextView tv=(TextView)view.findViewById(R.id.response);
        tv.setText("You Clicked "+getArguments().getString("response"));


        return view;
    

    @Override
    public String getPreceddingFragmentTag() 
    
        return "Fragment1";

自定义适配器：

    package com.example.tabs;

import com.actionbarsherlock.sample.fragments.R;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import android.app.Activity;

public class CustomAdapter extends ArrayAdapter<String>

    Context mcontext;

    public CustomAdapter(final Context context, final int textViewResourceId) 
    
        super(context, textViewResourceId);
        mcontext=context;
    

    @Override
    public int getCount() 
    
        return 50;
    

    @Override
    public View getView(final int position, final View convertView, final  ViewGroup parent) 
       
        View row;
        if(convertView==null)
        
             LayoutInflater inflater = ((Activity)mcontext).getLayoutInflater();
             row = inflater.inflate(R.layout.row, parent, false);
        
        else
        
            row=convertView;
        
        TextView tv=(TextView)row.findViewById(R.id.textView1);
        tv.setText("Option "+(position+1));
        return row;

基本片段：

    package com.example.tabs;

import com.actionbarsherlock.app.SherlockFragment;

public abstract class BaseFragment extends SherlockFragment

    public abstract String getPreceddingFragmentTag();


AnotherFragment:

     package com.example.tabs;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.actionbarsherlock.sample.fragments.R;

public class AnotherFragment extends BaseFragment
   
    @Override
    public void onCreate(final Bundle savedInstanceState) 
    
        super.onCreate(savedInstanceState);
    

    @Override
    public View onCreateView(final LayoutInflater inflater, final ViewGroup container, final Bundle savedInstanceState) 
    
        FragmentChangeListener fc=(FragmentChangeListener)getActivity();
        fc.addToTab1Navigation(this.toString());

        View view=inflater.inflate(R.layout.another_fragment, container, false);
        return view;
    
    @Override
    public String toString()
    
        return "AnotherFragment";
    

    @Override
    public String getPreceddingFragmentTag() 
    
        return "CustomFragment";

AnotherFragment 的布局。

    <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_
    android:layout_ >

    <TextView
        android:id="@+id/response"
        android:layout_
        android:layout_
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:text="@string/another"
        android:textAppearance="?android:attr/textAppearanceLarge" />

</RelativeLayout>

CustomFragment 的布局：

    *<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_
    android:layout_ >

    <TextView
        android:id="@+id/response"
        android:layout_
        android:layout_
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <Button
        android:id="@+id/button1"
        android:layout_
        android:layout_
        android:layout_below="@+id/response"
        android:text="@string/another_fragment"
        android:onClick="clickMe" />

</RelativeLayout>*

Frame1 的布局：

    <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_
    android:layout_ 
    android:orientation="vertical">

    <ListView
        android:id="@+id/mylistview"
        android:layout_
        android:layout_>
    </ListView>

</LinearLayout>

Fragment2 的布局：

     <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_
    android:layout_ >

    <TextView
        android:id="@+id/textView1"
        android:layout_
        android:layout_
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:text="@string/some_text"
        android:textAppearance="?android:attr/textAppearanceLarge" />

</RelativeLayout>

Fragment3 的布局：

    <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_
    android:layout_ >

    <ImageView
        android:id="@+id/imageView1"
        android:layout_
        android:layout_
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:src="@drawable/icon"
        android:contentDescription="@string/desc" />

</RelativeLayout>

Row.xml 的布局

    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_
    android:layout_
    tools:context=".MainActivity" >

    <TextView
        android:id="@+id/textView1"
        android:layout_
        android:layout_
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:padding="5dp" />

</RelativeLayout>

Tab.xml

    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_
    android:layout_
    tools:context=".MainActivity"
    android:layout_margin="3dp"
    android:background="@drawable/two_state_button"
    android:layout_weight="1">

    <ImageView
        android:id="@+id/img"
        android:layout_
        android:layout_
        android:src="@drawable/ic_compose_inverse"
        android:layout_centerHorizontal="true"
        android:contentDescription="@string/desc"/>

    <TextView
        android:id="@+id/txt"
        android:layout_
        android:layout_
        android:layout_below="@+id/img"
        android:layout_centerHorizontal="true"/>

</RelativeLayout>
    <menu xmlns:android="http://schemas.android.com/apk/res/android"></menu>

【讨论】：

您好，感谢您提供的代码...让我先试试这个.....完成后我会及时通知您。 嗨，艾哈迈德，谢谢，它非常适合我。这是我正在寻找的确切解决方案...【参考方案2】：

我的建议是你应该使用新的活动而不是碎片。片段会随你当前的活动一起显示，你不需要关心标签。

但如果您需要使用 Activity，则在 newActivity 布局中创建 tabhost 以及在此 Activity 的布局中创建。 并在创建另一个 Activity 的意图时，将当前的 Tab 编号附加到新的 Activity。

 Intent i = new Intent(Activity.this, NewActivity.Class);
 i.putIntExtra("CurrentVisibleTab", currentTabIndex);
 startActivity(i).

在新活动中。

tabHost.setDefault(getIntent().getIntExtra("CurrentVisibleTab"));

希望这会有所帮助。

【讨论】：

嗨 Ahmad，实际上我需要一个基于标签的导航应用程序，它在每个新布局上都有标签，无论是新的活动还是片段...... 你好，Raj，你应该在 Activity 上新建 Fragment。请参阅文档developer.android.com/guide/components/fragments.html。 你可以在Activity中做任何你想做的事情。不用创建新的 Activity，只需用新的 Fragment 替换当前的 Fragment。

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