我是编程新手。 我创建了一个包含3个带有viewpager选项卡的应用程序。第一个选项卡是Button列表及其各自的链接。第二个选项卡是一个WebView，当用户点击链接时，它将加载从第一个选项卡传递的URL。第三个标签是我的下载管理器。
这是我的MainActivity：
public class MainActivity extends SherlockFragmentActivity{
ActionBar mActionBar;
Button button;
ViewPager mPager;
Tab tab;
String TabFragmentB;
public void setTabFragmentB(String t){
TabFragmentB = t;
}
public String getTabFragmentB(){
return TabFragmentB;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mActionBar = getSupportActionBar();
// Hide Actionbar Icon
mActionBar.setDisplayShowHomeEnabled(false);
// Hide Actionbar Title
mActionBar.setDisplayShowTitleEnabled(false);
// Create Actionbar Tabs
mActionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
//For ViewPager
mPager = (ViewPager) findViewById(R.id.pager);
//Activate FragmentManger
FragmentManager fm= getSupportFragmentManager();
ViewPager.SimpleOnPageChangeListener ViewPagerListener = new ViewPager.SimpleOnPageChangeListener(){
@Override
public void onPageSelected(int position){
super.onPageSelected(position);
mActionBar.setSelectedNavigationItem(position);//find the viewPager Potision
}
};
mPager.setOnPageChangeListener(ViewPagerListener);
// Locate the adapter class called ViewPagerAdapter.java
ViewPagerAdapter viewpageradapter = new ViewPagerAdapter(fm);
// Set the View Pager Adapter into ViewPager
mPager.setAdapter(viewpageradapter);
// Capture tab button clicks
ActionBar.TabListener tabListener = new ActionBar.TabListener() {
@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
// Pass the position on tab click to ViewPager
mPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
};
// Create first Tab
tab = mActionBar.newTab().setIcon(R.drawable.button_home).setTabListener(tabListener);
mActionBar.addTab(tab);
// Create second Tab
tab = mActionBar.newTab().setIcon(R.drawable.button_browse).setTabListener(tabListener);
mActionBar.addTab(tab);
// Create third Tab
tab = mActionBar.newTab().setIcon(R.drawable.button_downloads).setTabListener(tabListener);
mActionBar.addTab(tab);
}
}
My FragmentTab1：
public class FragmentTab1 extends SherlockFragment implements OnClickListener{
FragmentTab2 fTab2;
ViewPager viewPager;
WebView webview;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.home, container, false);
viewPager = (ViewPager) getActivity().findViewById(R.id.pager);
webview = (WebView) view.findViewById(R.id.webView1);
view.findViewById(R.id.Button01).setOnClickListener(this);
view.findViewById(R.id.Button02).setOnClickListener(this);
view.findViewById(R.id.Button03).setOnClickListener(this);
view.findViewById(R.id.Button04).setOnClickListener(this);
view.findViewById(R.id.Button05).setOnClickListener(this);
return view;
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
setUserVisibleHint(true);
}
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.Button01:
String urlToBeSend = " http://google.com";
String TabOfFragmentB = ((MainActivity)getActivity()).getTabFragmentB();
FragmentTab2 fragmentB = (FragmentTab2)getActivity().getSupportFragmentManager().findFragmentByTag(TabOfFragmentB);
fragmentB.b_updateText(urlToBeSend);
Toast.makeText(getSherlockActivity(), "url to be send = " +urlToBeSend, Toast.LENGTH_LONG).show();
viewPager.setCurrentItem(1);
break;
case R.id.Button02:
String urlToBeSend2 = " http://facebook.com";
String TabOfFragmentB2 = ((MainActivity)getActivity()).getTabFragmentB();
FragmentTab2 fragmentB2 = (FragmentTab2)getActivity().getSupportFragmentManager().findFragmentByTag(TabOfFragmentB2);
fragmentB2.b_updateText(urlToBeSend2);
Toast.makeText(getSherlockActivity(), "url to be send = " +urlToBeSend2, Toast.LENGTH_LONG).show();
viewPager.setCurrentItem(1);
break;
case R.id.Button03:
viewPager.setCurrentItem(1);
break;
case R.id.Button04:
viewPager.setCurrentItem(1);
break;
case R.id.Button05:
viewPager.setCurrentItem(1);
break;
default:
break;
}
}
}
For My FragmentTab2：
public class FragmentTab2 extends SherlockFragment {
private static WebView webview;
private ProgressBar progress;
String homeUrl="http://new3gpmovies.com/";
private int urlIndex=0;
String a_url;
TextView b_received;
ViewPager viewpager;
public void b_updateText(String t){
b_received.setText(t);
a_url = t;
}
public FragmentTab2(){
}
@SuppressLint("SetJavaScriptEnabled")
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.webview, container, false);
String myTag = getTag();
((MainActivity)getActivity()).setTabFragmentB(myTag);
b_received = (TextView) view.findViewById(R.id.textView1);
ImageView backward = (ImageView) view.findViewById(R.id.backward);
ImageView forward = (ImageView) view.findViewById(R.id.forward);
backward.setOnClickListener(new OnClickListener(){
public void onClick(View view){
if (webview.canGoBack()){
webview.goBack();
}
}
});
forward.setOnClickListener(new OnClickListener(){
public void onClick(View view){
if (webview.canGoForward()){
webview.goForward();
}
}
});
webview = (WebView) view.findViewById(R.id.webView1);
webview.setWebChromeClient(new MyWebChromeClient());
webview.setWebViewClient(new MyWebViewClient());
WebSettings settings = webview.getSettings();
settings.setJavaScriptEnabled(true);
progress = (ProgressBar) view.findViewById(R.id.progressBar1);
progress.setMax(100);
if (a_url != null){
webview.loadUrl(a_url);
}else if (a_url == null){
webview.loadUrl(homeUrl);
}
if (progress.getProgress() == 100){
FragmentTab2.this.progress.setProgress(0);
}
return view;
}
private class MyWebViewClient extends WebViewClient{
@SuppressLint({ "InlinedApi", "NewApi" })
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url){
boolean value = true;
if (url.endsWith(".3gp") || url.endsWith(".mp4")){
Intent downloadIntent = new Intent("com.nanoidea.download.services.IDownloadService");
downloadIntent.putExtra(MyIntents.TYPE, MyIntents.Types.ADD);
downloadIntent.putExtra(MyIntents.URL, Utils.url[urlIndex]);
getActivity().startService(downloadIntent);
urlIndex++;
if (urlIndex >= Utils.url.length) {
urlIndex = 0;
}
value=false;
}
if(value){
view.loadUrl(url);
}
return value;
}
@Override
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl){
webview.loadUrl("file:///android_asset/failedPage.html");
}
}
public String getFileName(String url) {
String filenameWithoutExtension = "";
if (url.endsWith("3gp")){
filenameWithoutExtension = String.valueOf(System.currentTimeMillis()
+ ".3gp");
}else if (url.endsWith(".mp4")){
filenameWithoutExtension = String.valueOf(System.currentTimeMillis()
+ ".mp4");
}
return filenameWithoutExtension;
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
setUserVisibleHint(true);
}
private class MyWebChromeClient extends WebChromeClient{
@Override
public void onProgressChanged(WebView view, int newProgress){
FragmentTab2.this.setValue(newProgress);
super.onProgressChanged(view, newProgress);
}
}
public void setValue(int progress){
this.progress.setProgress(progress);
}
public static boolean canGoBack(){
return webview.canGoBack();
}
public static void goBack(){
webview.goBack();
}
}
问题：
为什么当我点击第一个标签中的链接时，第二个标签不会改变？即使第二个标签从第一个标签收到了字符串网址？任何的想法？请指导我。