Question

我使用FragmentTabHost和TabWidget创建4个标签。选择某个选项卡后，它会从其相关类中打开其相关的xml文件。假设我选择了标签1.它在网页浏览中打开了一个网站。然后我移动到下一个选项卡，即选项卡2.当我回到选项卡1时，它重新绘制webview并再次请求该网站。它像以前一样需要与同一页面一样无用。我的意思是不保留tab的最后状态。它从头开始。如果我离开标签1，如何获取网页的最后内容？这是代码：

setContentView(R.layout.bottom_tabs);

    mTabHost = (FragmentTabHost) findViewById(android.R.id.tabhost);
    mTabHost.setup(this, getSupportFragmentManager(), R.id.realtabcontent);

    Bundle b = new Bundle();
    b.putString("key", "Home");
    mTabHost.addTab(mTabHost.newTabSpec("home").setIndicator("Home"),
            Home.class, b);
    //
    b = new Bundle();
    b.putString("key", "Menu");
    mTabHost.addTab(mTabHost.newTabSpec("menu").setIndicator("Menu"),
            MenuDemo.class, b);


    b = new Bundle();
    b.putString("key", "Promos");
    mTabHost.addTab(mTabHost.newTabSpec("promos").setIndicator("Promos"),
            Promos.class, b);

    b = new Bundle();
    b.putString("key", "Promos");
    mTabHost.addTab(mTabHost.newTabSpec("location").setIndicator("Location"),
            Location.class, b);

标签1打开此活动：

public class Home extends Fragment{

public Home() {
    // TODO Auto-generated constructor stub

}

@Override
public void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
}

@SuppressLint("SetJavaScriptEnabled")
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    View v = LayoutInflater.from(getActivity()).inflate(R.layout.home,
            null);
    WebView webView = (WebView) v.findViewById(R.id.webViewHome);
    webView.setWebViewClient(new MyWebViewClient());
    webView.getSettings().setJavaScriptEnabled(true);
    webView.loadUrl("http://www.google.com");

    return v;
}
private class MyWebViewClient extends WebViewClient {
    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        view.loadUrl(url);
        return true;
    }
}

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onActivityCreated(savedInstanceState);
}
//

}

Answer 1

在你的mainTab Activity中你应该做这样的事情来隐藏片段并检查它是否已经加载只显示它：

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);
                    ft.hide(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);
                    ft.show(newTab.fragment);

                }
            }

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

        }
    }

并将标签的标签发送给该标签。

希望有所帮助:)

保存选项卡的上一个状态

1 个答案: