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我有这段代码,它在我的应用程序的按钮上创建一个选项卡。我创建了 3 个选项卡。我的选项卡实现几乎相同,仅更改了布局的颜色。我想测试,但它没有显示我创建的布局。

也许我做错了什么。

这是我的第一个选项卡类:

public class Tab1Fragment extends Fragment {

    /** (non-Javadoc)
     * @see android.support.v4.app.Fragment#onCreateView(android.view.LayoutInflater, android.view.ViewGroup, android.os.Bundle)
     */
    public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {

        Log.v("test","onCreateView:Tab1Fragment");

        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.frag1_button);
        b.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Toast.makeText(Tab1Fragment.this.getActivity(), "OnClickMe button clicked", Toast.LENGTH_LONG).show();

            }
        });
        return theLayout;
    }
}

而这个类布局:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="#FF0000" >

    <Button
        android:id="@+id/frag1_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" />

</LinearLayout>

但是,当我运行它时,它会为我调用并打印: onCreateView:Tab1Fragment

但我没有看到带有按钮和红色的布局。

我发现我的错误现在标签和框架显示在设备 2.1 中,尺寸为 480x800,但在平板电脑上它无法正常工作。

以下是如何添加标签的代码:

打包我的.test.project;

import java.util.HashMap;

import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.util.Log;
import android.view.View;
import android.widget.TabHost;
import android.widget.TabHost.TabContentFactory;

/**
 * @author mwho
 * 
 */
public class TabsFragmentActivity extends FragmentActivity implements
        TabHost.OnTabChangeListener {

    private TabHost mTabHost;
    private HashMap<String, TabInfo> mapTabInfo = new HashMap<String, TabInfo>();
    private TabInfo mLastTab = null;

    private class TabInfo {
        private String tag;
        private Class<?> clss;
        private Bundle args;
        private Fragment fragment;

        TabInfo(String tag, Class<?> clazz, Bundle args) {
            this.tag = tag;
            this.clss = clazz;
            this.args = args;
        }

    }

    class TabFactory implements TabContentFactory {

        private final Context mContext;

        /**
         * @param context
         */
        public TabFactory(Context context) {
            mContext = context;
        }

        /**
         * (non-Javadoc)
         * 
         * @see android.widget.TabHost.TabContentFactory#createTabContent(java.lang.String)
         */
        public View createTabContent(String tag) {
            View v = new View(mContext);
            v.setMinimumWidth(0);
            v.setMinimumHeight(0);
            return v;
        }

    }

    /**
     * (non-Javadoc)
     * 
     * @see android.support.v4.app.FragmentActivity#onCreate(android.os.Bundle)
     */
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        // Step 1: Inflate layout
        setContentView(R.layout.main_tab_activity);

        // Step 2: Setup TabHost
        initialiseTabHost(savedInstanceState);

        if (savedInstanceState != null) {
            mTabHost.setCurrentTabByTag(savedInstanceState.getString("tab")); 
        }

        Log.v("test","tabs");
    }

    /**
     * (non-Javadoc)
     * 
     * @see android.support.v4.app.FragmentActivity#onSaveInstanceState(android.os.Bundle)
     */
    protected void onSaveInstanceState(Bundle outState) {
        outState.putString("tab", mTabHost.getCurrentTabTag()); // save the tab
                                                                // selected
        super.onSaveInstanceState(outState);
    }

    /**
     * Step 2: Setup TabHost
     */
    private void initialiseTabHost(Bundle args) {

        //ge
        mTabHost = (TabHost) findViewById(android.R.id.tabhost);

        mTabHost.setup();

        TabInfo tabInfo = null;

        TabsFragmentActivity.addTab(this, this.mTabHost, this.mTabHost
                .newTabSpec("Tab1").setIndicator("Tab 1"),
                (tabInfo = new TabInfo("Tab1", Tab1Fragment.class, args)));

        this.mapTabInfo.put(tabInfo.tag, tabInfo);

        TabsFragmentActivity.addTab(this, this.mTabHost, this.mTabHost
                .newTabSpec("Tab2").setIndicator("Tab 2"),
                (tabInfo = new TabInfo("Tab2", Tab2Fragment.class, args)));

        this.mapTabInfo.put(tabInfo.tag, tabInfo);

        TabsFragmentActivity.addTab(this, this.mTabHost, this.mTabHost
                .newTabSpec("Tab3").setIndicator("Tab 3"),
                (tabInfo = new TabInfo("Tab3", Tab3Fragment.class, args)));

        this.mapTabInfo.put(tabInfo.tag, tabInfo);
        // Default to first tab

        this.onTabChanged("Tab1");
        //
        mTabHost.setOnTabChangedListener(this);
    }


    /**
     * @param activity
     * @param tabHost
     * @param tabSpec
     * @param clss
     * @param args
     */
    private static void addTab(TabsFragmentActivity activity, TabHost tabHost,TabHost.TabSpec tabSpec, TabInfo tabInfo) {

        // Attach a Tab view factory to the spec
        tabSpec.setContent(activity.new TabFactory(activity));

        String tag = tabSpec.getTag();

        // Check to see if we already have a fragment for this tab, probably
        // from a previously saved state. If so, deactivate it, because our
        // initial state is that a tab isn't shown.
        tabInfo.fragment = activity.getSupportFragmentManager().findFragmentByTag(tag);

        if (tabInfo.fragment != null && !tabInfo.fragment.isDetached()) {

            FragmentTransaction ft = activity.getSupportFragmentManager().beginTransaction();

            ft.detach(tabInfo.fragment);

            ft.commit();

            activity.getSupportFragmentManager().executePendingTransactions();

        }

        tabHost.addTab(tabSpec);
    }

    /**
     * (non-Javadoc)
     * 
     * @see android.widget.TabHost.OnTabChangeListener#onTabChanged(java.lang.String)
     */
    public void onTabChanged(String tag) {

        TabInfo newTab = this.mapTabInfo.get(tag);

        if (mLastTab != newTab) {

            FragmentTransaction ft = this.getSupportFragmentManager().beginTransaction();

            if (mLastTab != null) {
                if (mLastTab.fragment != null) {
                    ft.detach(mLastTab.fragment);
                }
            }

            if (newTab != null) {
                if (newTab.fragment == null) {

                    newTab.fragment = Fragment.instantiate(this,newTab.clss.getName(), newTab.args);

                    ft.add(R.id.realtabcontent, newTab.fragment, newTab.tag);

                } else {
                    ft.attach(newTab.fragment);
                }
            }

            mLastTab = newTab;
            ft.commit();
            this.getSupportFragmentManager().executePendingTransactions();
        }
    }

}

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

    <TabHost
        android:id="@android:id/tabhost"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" >

        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:orientation="vertical" >

            <FrameLayout
                android:id="@android:id/tabcontent"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:layout_weight="0" />

            <FrameLayout
                android:id="@+android:id/realtabcontent"
                android:layout_width="fill_parent"
                android:layout_height="0dp"
                android:layout_weight="1" />

            <TabWidget
                android:id="@android:id/tabs"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_weight="0"
                android:orientation="horizontal" />
        </LinearLayout>
    </TabHost>

</LinearLayout>
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