从选项卡中的按钮切换选项卡

Question

我正在使用片段并创建了一个带有3个标签的tabhost，并在第一个标签中放置了一个按钮。我的问题是我可以从我创建的按钮更改为第二个选项卡吗？这是我的代码：

 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;
        }

    }

    /**
     * 
     * @author mwho
     * 
     */
    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);
        setContentView(R.layout.tabs_layout);
        initialiseTabHost(savedInstanceState);
        if (savedInstanceState != null) {
            mTabHost.setCurrentTabByTag(savedInstanceState.getString("tab")); // set
                                                                                // the
                                                                                // tab
                                                                                // as
                                                                                // per
                                                                                // the
                                                                                // saved
                                                                                // state
        }
    }

    /**
     * (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);
    }

    /**
     * Initialise the Tab Host
     */
    private void initialiseTabHost(Bundle args) {
        mTabHost = (TabHost) findViewById(android.R.id.tabhost);
        mTabHost.setup();
        TabInfo tabInfo = null;
        ElastoTabsActivity.addTab(this, this.mTabHost, this.mTabHost
                .newTabSpec("Tab1").setIndicator("Home"),
                (tabInfo = new TabInfo("Tab1", HomeTab.class, args)));
        this.mapTabInfo.put(tabInfo.tag, tabInfo);
        ElastoTabsActivity.addTab(this, this.mTabHost, this.mTabHost
                .newTabSpec("Tab2").setIndicator("Taping Prep"),
                (tabInfo = new TabInfo("Tab2", Tab2Fragment.class, args)));
        this.mapTabInfo.put(tabInfo.tag, tabInfo);
        ElastoTabsActivity.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(ElastoTabsActivity 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();
        }
    }

谢谢！

Answer 1

在编写代码之前，您是否有机会阅读TabHost documentary？因为您已在代码中使用a function来更改标签。

您唯一需要做的就是在按钮的onClick侦听器中实现它。如果您不知道如何处理按钮点击，网上会有大量示例。