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我已经实现了带有片段的选项卡布局，并且一切正常。我唯一不喜欢的是选项卡中的 Web 视图（每次加载同一个站点时都会加载），每次我离开选项卡然后回到它时都会加载站点。有没有办法让 web 视图只加载一次？我真的不知道从哪里开始...

这是类 TabInfo（帮助类）的代码，第一次为所有选项卡调用的添加选项卡方法，以及选项卡更改事件处理程序

    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;
            }

        }

private void addTab(String tag, String title, TabInfo tabInfo) {
        TabSpec ts = getTabSpec(tag, title);
        // Attach a Tab view factory to the spec
        ts.setContent(new TabFactory(this));
        // 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 = getSupportFragmentManager().findFragmentByTag(tag);
        if (tabInfo.fragment != null && !tabInfo.fragment.isDetached()) {
            FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
            ft.detach(tabInfo.fragment);
            ft.commit();
            getSupportFragmentManager().executePendingTransactions();
        }

        mTabHost.addTab(ts);
    }


    public void onTabChanged(String tag) {

            try {
                TabInfo newTab = (TabInfo) 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();
                }
                // fillCommonData();
            } catch (Exception e) {
                LogHelper.WriteLogError("error in onTabChanged function", e);
            }
        }

谢谢

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1 回答 1

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这是一个猜测，但是当您不想重新加载时，覆盖 shouldOverrideUrlLoading() 并返回 true。

shouldOverrideUrlLoading() 是 WebViewClient 的方法在您的 webview 上，调用 setWebViewClient 并将其传递给实现 shouldOverrideUrlLoading 的自定义类

mWebView.setWebViewClient(new WebViewClient(){

    public boolean shouldOverrideUrlLoading(WebView webview, String url ){
        if(/* code to determine if already loaded/tab selected */) return true;
        return false;
    }

});
于 2014-01-28T20:35:34.523 回答