[英]How to use Actionbar items with Viewpager + Fragments
我试图找出如何基于我的viewpager中加载的Fragment实现Actionbar项目。 我的代码如下,我只想弄清楚使用ABS + ViewPager + Fragments的最佳实践。
public class MainActivity extends SherlockFragmentActivity {
private ViewPager mPager;
private TitlePageIndicator mIndicator;
private MainPagerAdapter mAdapter;
private List<Fragment> mFragments;
private static final String FRAGMENT1 = Fragment1.class.getName();
private static final String FRAGMENT2 = Fragment2.class.getName();
private static final String FRAGMENT3 = SupportFragment.class.getName();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.a_main);
// add fragments
mFragments = new ArrayList<Fragment>();
mFragments.add(Fragment.instantiate(this, FRAGMENT1));
mFragments.add(Fragment.instantiate(this, FRAGMENT2));
mFragments.add(Fragment.instantiate(this, FRAGMENT3));
// adapter
mAdapter = new MainPagerAdapter(getSupportFragmentManager(), mFragments);
// pager
mPager = (ViewPager) findViewById(R.id.view_pager);
mPager.setAdapter(mAdapter);
// indicator
mIndicator = (TitlePageIndicator) findViewById(R.id.title_indicator);
mIndicator.setViewPager(mPager);
}
...
public class MainPagerAdapter extends FragmentPagerAdapter {
private List<Fragment> mFragments;
private String[] titles = new String[] {"System", "Community", "Support"};
private int mCount = titles.length;
public MainPagerAdapter(FragmentManager fm, List<Fragment> f) {
super(fm);
mFragments = f;
}
@Override
public Fragment getItem(int position) {
return mFragments.get(position);
}
@Override
public int getCount() {
return mCount;
}
@Override
public CharSequence getPageTitle(int position) {
return titles[position];
}
public class Fragment1 extends SherlockFragment {
WebView web;
static ProgressBar progressBar;
@Override
public View onCreateView(LayoutInflater inf, ViewGroup grp, Bundle icicle) {
View v = inf.inflate(R.layout.activity_main, grp, false);
web = (WebView) v.findViewById(R.id.webView);
progressBar = (ProgressBar) v.findViewById(R.id.progressBar1);
return v;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
web.setWebViewClient(new SpecialWebView(progressBar));
web.setWebChromeClient(new SpecialWebChromeClient(progressBar));
// Progress Bar - End
WebSettings websettings = web.getSettings();
websettings.setBuiltInZoomControls(false);
web.setBackgroundColor(Color.parseColor("#f2f2f2"));
websettings.setUseWideViewPort(true);
websettings.setJavaScriptEnabled(true);
websettings.setAllowFileAccess(true);
websettings.setDomStorageEnabled(true);
websettings.setLoadWithOverviewMode(true);
websettings.setSavePassword(true);
web.loadUrl("http://www.google.com");
}
在我的MainActivity中,我尝试了以下内容并且无法正确获取代码。
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater Inflater = getSupportMenuInflater();
Inflater.inflate(R.menu.menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem Item) {
final int current = ((ViewPager) mFragments).getCurrentItem();
String currentId = current == 0 ? FRAGMENT1: (current == 1 ? FRAGMENT2: FRAGMENT3);
//WebView web = (WebView) findViewById(currentId);
switch (Item.getItemId()) {
case R.id.menu_back:
// web.goBack();
return true;
case R.id.menu_forward:
//web.goForward();
return true;
case R.id.menu_refresh:
//web.reload();
return true;
}
return super.onOptionsItemSelected(Item);
}
我试图找出如何基于我的viewpager中加载的Fragment实现Actionbar项目。
这会自动发生。 只需让片段调用setHasOptionsMenu(true)
,然后实现onCreateOptionsMenu()
和onOptionsItemSelected()
。 Fragment*PagerAdapter
将安排在页面更改后重新填充操作栏,从上一页中删除操作栏项目并从新当前页面引入操作栏项目。
这是一个示例项目,演示了操作栏项目的来来往往,因为只有奇数页面(对于基于1的索引,用户看到的内容)具有操作栏项目。
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