Question

我正在制作网络浏览器。我已经使用片段进行制表，但是当用户从一个制表符转到另一个制表符并再次返回时，webview的url会重置并且用户的url会丢失。我的问题是;片段切换时如何停止webview重置。我研究了左右和中心试图解决这个问题，但没有运气。谢谢！

public class HomeFragment extends Fragment {

public HomeFragment(){}

private WebView WebViewB1;
private ProgressBar Pbar1;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    View rootView = inflater.inflate(R.layout.fragment_home, container, false);

    Pbar1 = (ProgressBar) rootView.findViewById(R.id.progBar1);
    WebViewB1 = (WebView) rootView.findViewById(R.id.wvBrowserTab1);

    WebSettings webSettings = WebViewB1.getSettings();
    webSettings.setJavaScriptEnabled(true);
    WebViewB1.getSettings().setLoadWithOverviewMode(true);
    WebViewB1.getSettings().setUseWideViewPort(true);
    WebViewB1.getSettings().setBuiltInZoomControls(true);
    WebViewB1.getSettings().setAllowFileAccess(true);

    WebViewB1.setWebViewClient(new InsideWebViewClient());
    WebViewB1.setWebChromeClient(new WebChromeClient() {
        public void onProgressChanged(WebView view, int progress) 
        {
        if(progress < 100 && Pbar1.getVisibility() == ProgressBar.GONE){
            Pbar1.setVisibility(ProgressBar.VISIBLE);
        }
        Pbar1.setProgress(progress);
        if(progress == 100) {
            Pbar1.setVisibility(ProgressBar.GONE);
        }
     }
 });

        WebViewB1.loadUrl("http://google.com");

    return rootView;
}

}

下面的滑动菜单活动

public class MainActivity extends Activity {

private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;


private CharSequence mDrawerTitle;

private CharSequence mTitle;

private String[] navMenuTitles;
private TypedArray navMenuIcons;

private ArrayList<NavDrawerItem> navDrawerItems;
private NavDrawerListAdapter adapter;

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mTitle = mDrawerTitle = getTitle();

    navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);

    navMenuIcons = getResources()
            .obtainTypedArray(R.array.nav_drawer_icons);

    mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
    mDrawerList = (ListView) findViewById(R.id.list_slidermenu);

    navDrawerItems = new ArrayList<NavDrawerItem>();

    navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1)));

    navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1)));

    navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons.getResourceId(2, -1)));

    navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuIcons.getResourceId(3, -1)));

    navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], navMenuIcons.getResourceId(4, -1)));

    navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuIcons.getResourceId(5, -1)));

    navMenuIcons.recycle();

    mDrawerList.setOnItemClickListener(new SlideMenuClickListener());

    adapter = new NavDrawerListAdapter(getApplicationContext(),
            navDrawerItems);
    mDrawerList.setAdapter(adapter);

    getActionBar().setDisplayHomeAsUpEnabled(true);
    getActionBar().setHomeButtonEnabled(true);

    mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
            R.drawable.ic_drawer,
            R.string.app_name,
            R.string.app_name
    ) {
        public void onDrawerClosed(View view) {
            getActionBar().setTitle(mTitle);
            invalidateOptionsMenu();
        }

        public void onDrawerOpened(View drawerView) {
            getActionBar().setTitle(mDrawerTitle);
            invalidateOptionsMenu();
        }
    };
    mDrawerLayout.setDrawerListener(mDrawerToggle);

    if (savedInstanceState == null) {
        displayView(0);
    }
}
private class SlideMenuClickListener implements
        ListView.OnItemClickListener {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position,
            long id) {
        displayView(position);
    }
}
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.main, menu);

    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    if (mDrawerToggle.onOptionsItemSelected(item)) {
        return true;
    }
    switch (item.getItemId()) {
    case R.id.action_settings:
        return true;
    default:
        return super.onOptionsItemSelected(item);
    }
}

@Override
public boolean onPrepareOptionsMenu(Menu menu) {
    boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
    menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
    return super.onPrepareOptionsMenu(menu);
}

private void displayView(int position) {
    Fragment fragment = null;

    switch (position) {
    case 0:
        fragment = new HomeFragment();
        break;
    case 1:
        fragment = new Tab2();
        break;
    case 2:
        fragment = new Tab3();
        break;
    case 3:
        fragment = new Tab4();
        break;
    case 4:
        fragment = new Tab5();
        break;
    case 5:
        fragment = new Tab6();
        break;

    default:
        break;
    }

    if (fragment != null) {
        FragmentManager fragmentManager = getFragmentManager();
        fragmentManager.beginTransaction()
                .replace(R.id.frame_container, fragment).commit();

        mDrawerList.setItemChecked(position, true);
        mDrawerList.setSelection(position);
        setTitle(navMenuTitles[position]);
        mDrawerLayout.closeDrawer(mDrawerList);
    } else {
        Log.e("MainActivity", "Error in creating fragment");
    }
}

@Override
public void setTitle(CharSequence title) {
    mTitle = title;
    getActionBar().setTitle(mTitle);
}

@Override
protected void onPostCreate(Bundle savedInstanceState) {
    super.onPostCreate(savedInstanceState);
    mDrawerToggle.syncState();
}

@Override
public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
    mDrawerToggle.onConfigurationChanged(newConfig);
}
 }

Answer 1

好的，我不确定它的好主意，但以下是我所说的：

    public abstract class AbstractFragment extends Fragment {

        private View mFragmentView;
        protected View getOnCreateView(LayoutInflater inflater, int layoutId){

             if (mFragmentView== null)
                 mFragmentView = inflater.inflate(layoutId, null);
             else
                 ((ViewGroup) mFragmentView.getParent()).removeView(mFragmentView);

             return mFragmentView;
        }


// this method needed to detect if fragment's view init is needed
// via initView() - its the method where you do findViewById()
// and sets up your webveiw, etc. The idea is to set up the view
// only once - in case when it has not been init-ed
// this will prevent your webview from reload from the start url
            protected boolean isFragmentViewInitialized;
            @Override
            public void onStart() {
                super.onStart();

                if (!isFragmentViewInitialized){
                    isFragmentViewInitialized = true;
                    initView();
                }

    }

        // use this method to setup the view
        public abstract void initView();

我们的想法是根据您需要保留的每个片段扩展此片段，并从getOnCreateView调用onCreate()，如：

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            return getOnCreateView(inflater,R.layout.activity_about);
        }
        public void initView(){
            View rootView = getView();
Pbar1 = (ProgressBar) rootView.findViewById(R.id.progBar1);
    WebViewB1 = (WebView) rootView.findViewById(R.id.wvBrowserTab1);

    WebSettings webSettings = WebViewB1.getSettings();
    webSettings.setJavaScriptEnabled(true);
    WebViewB1.getSettings().setLoadWithOverviewMode(true);
    WebViewB1.getSettings().setUseWideViewPort(true);
    WebViewB1.getSettings().setBuiltInZoomControls(true);
    WebViewB1.getSettings().setAllowFileAccess(true);

    WebViewB1.setWebViewClient(new InsideWebViewClient());
    WebViewB1.setWebChromeClient(new WebChromeClient() {
        public void onProgressChanged(WebView view, int progress) 
        {
        if(progress < 100 && Pbar1.getVisibility() == ProgressBar.GONE){
            Pbar1.setVisibility(ProgressBar.VISIBLE);
        }
        Pbar1.setProgress(progress);
        if(progress == 100) {
            Pbar1.setVisibility(ProgressBar.GONE);
        }
     }
 });

        WebViewB1.loadUrl("http://google.com");
        }

Answer 2

由于我的标签监听器

，每次重新选择时，片段都会重新加载

if (fragment != null) {
    FragmentManager fragmentManager = getFragmentManager();
    fragmentManager.beginTransaction()
            .replace(R.id.frame_container, fragment).commit();

做了一个更好的tabListener之后的东西，A-OK。查看此链接，了解标签监听器的改进方式 - http://developer.android.com/guide/topics/ui/actionbar.html#Tabs

停止重置自身的片段

2 个答案: