我试图通过选择“固定选项卡+ swype”的导航类型来为我创建项目时自动设置表格格式的活动。在每个标签中，我加载了一个基于标签更改URL的Web视图。在一个选项卡中，尽管我想调用驻留在Web视图将要访问的页面上的JS函数。我没有运气就尝试了各种各样的事情，JS函数起作用了，但是由于某种原因它没有被调用。
下面代码中的url不是我实际使用的URL，这里也供参考的是JS函数
function callFromActivity(msg){
document.getElementById("mytext").innerHTML = msg;
}
public class MainActivity extends FragmentActivity implements ActionBar.TabListener {
/**
* The {@link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {@link android.support.v4.app.FragmentPagerAdapter} derivative, which
* will keep every loaded fragment in memory. If this becomes too memory
* intensive, it may be best to switch to a
* {@link android.support.v4.app.FragmentStatePagerAdapter}.
*/
SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {@link ViewPager} that will host the section contents.
*/
ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Set up the action bar.
final ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Create the adapter that will return a fragment for each of the three
// primary sections of the app.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
// When swiping between different sections, select the corresponding
// tab. We can also use ActionBar.Tab#select() to do this if we have
// a reference to the Tab.
mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
@Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position);
}
});
// For each of the sections in the app, add a tab to the action bar.
for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
// Create a tab with text corresponding to the page title defined by
// the adapter. Also specify this Activity object, which implements
// the TabListener interface, as the callback (listener) for when
// this tab is selected.
actionBar.addTab(
actionBar.newTab()
.setText(mSectionsPagerAdapter.getPageTitle(i))
.setTabListener(this));
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
// When the given tab is selected, switch to the corresponding page in
// the ViewPager.
mViewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
}
@Override
public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a DummySectionFragment (defined as a static inner class
// below) with the page number as its lone argument.
Fragment fragment = new DummySectionFragment();
Bundle args = new Bundle();
args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position + 1);
fragment.setArguments(args);
return fragment;
}
@Override
public int getCount() {
// Show 5 total pages.
return 5;
}
@Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return getString(R.string.title_section1).toUpperCase(l);
case 1:
return getString(R.string.title_section2).toUpperCase(l);
case 2:
return getString(R.string.title_section3).toUpperCase(l);
case 3:
return getString(R.string.title_section4).toUpperCase(l);
case 4:
return getString(R.string.title_section5).toUpperCase(l);
}
return null;
}
}
/**
* A dummy fragment representing a section of the app, but that simply
* displays dummy text.
*/
public static class DummySectionFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
public static final String ARG_SECTION_NUMBER = "section_number";
public DummySectionFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main_dummy, container, false);
View htmlView =inflater.inflate(R.layout.home_wvtc,container,false);
WebView wc = (WebView) htmlView.findViewById(R.id.webView1);
TextView dummyTextView = (TextView) rootView.findViewById(R.id.section_label);
// dummyTextView.setText(Integer.toString(getArguments().getInt(ARG_SECTION_NUMBER)));
if(getArguments().getInt(ARG_SECTION_NUMBER) == 1 )
{
wc.getSettings().setJavaScriptEnabled(true);
wc.loadUrl("http://www.example.com/android/index.html");
wc.loadUrl("javascript:callFromActivity('some msg')");
wc.setWebViewClient(new WebViewClient(){
public boolean shouldOverrideUrlLoading(WebView view, String url) {
return false;
}
});
return htmlView;
}
if(getArguments().getInt(ARG_SECTION_NUMBER) == 2 )
{
wc.getSettings().setJavaScriptEnabled(true);
wc.loadUrl("http://www.example.com/android/request.html");
wc.setWebViewClient(new WebViewClient(){
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (url != null ) {
return false;
} else {
return false;
}
}
});
return htmlView;
}
if(getArguments().getInt(ARG_SECTION_NUMBER) == 3 )
{
wc.getSettings().setJavaScriptEnabled(true);
wc.loadUrl("http://www.example.com/android/recent.html");
wc.setWebViewClient(new WebViewClient(){
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (url != null ) {
return false;
} else {
return false;
}
}
});
return htmlView;
}
if(getArguments().getInt(ARG_SECTION_NUMBER) == 4 )
{
wc.getSettings().setJavaScriptEnabled(true);
wc.loadUrl("http://www.example.com/android/queue.html");
wc.setWebViewClient(new WebViewClient(){
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (url != null ) {
return false;
} else {
return false;
}
}
});
return htmlView;
}
if(getArguments().getInt(ARG_SECTION_NUMBER) == 5 )
{
wc.getSettings().setJavaScriptEnabled(true);
wc.loadUrl("http://www.example.com/android/webcam.html");
wc.setWebViewClient(new WebViewClient(){
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (url != null ) {
return false;
} else {
return false;
}
}
});
return htmlView;
}
else {
return rootView;
}
}
}
}
最佳答案
在执行Java脚本之前，您应该等待文档加载完成。您可以使用WebChromeClient监视加载进度。
private class MyWebChromeClient extends WebChromeClient {
private WebView mWebView;
public MyWebChromeClient(WebView webView)
{
mWebView = webView;
}
@Override
public void onProgressChanged(WebView view, int newProgress) {
super.onProgressChanged(view, newProgress);
if (newProgress == 100) {
mWebView.loadUrl("javascript:callFromActivity('some msg')");
}
}
}
将
MyWebChromeClient设置为WebViewwc.getSettings().setJavaScriptEnabled(true);
wc.loadUrl("http://www.example.com/android/index.html");
wc.setWebChromeClient(new MyWebChromeClient(wc));