public class Tabs extends FragmentActivity implements ActionBar.TabListener {
ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tabs);
// 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.tabs, 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 3 total pages.
return 3;
}
@Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return "Calendar";
case 1:
return "Check Points";
case 2:
return "Information";
}
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_tabs_dummy, container, false);
View calendarView = inflater.inflate(R.layout.calendar_view, container, false);
View emailView = inflater.inflate(R.layout.email_view, container, false);
int tabPosition = getArguments().getInt(ARG_SECTION_NUMBER);
switch(tabPosition)
{
case 1:
WebView mWebView = (WebView) calendarView.findViewById(R.id.webview);
mWebView.getSettings().setJavaScriptEnabled(true);
mWebView.loadUrl("a url");
return calendarView;
case 2:
TextView dummyTextView2 = (TextView) rootView.findViewById(R.id.section_label);
dummyTextView2.setText("Under Construction");
return rootView;
case 3:
emailView.findViewById(R.id.emailView);
Class ourClass = Class.forName("com.packagename.Email");
try
{
Intent ourIntent = new Intent(Tabs.this, ourClass);
startActivity(ourIntent);
}
catch(ClassNotFoundException e)
{
e.printStackTrace();
}
return emailView;
}
return null;
}
}
这是我设置每个标签的地方。
public class Email extends Activity implements View.OnClickListener {
EditText subject, message;
String emailaddress[] = {"myemail@domain.com", "otheremail@other.com"};
String msgSend, subjectSend;
Button sendEmail;
@Override
protected void onCreate(Bundle savedInstanceState)
{
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.email_view);
initializeVars();
sendEmail.setOnClickListener(this);
}
private void initializeVars()
{
// TODO Auto-generated method stub
subject = (EditText) findViewById(R.id.etSubject);
message = (EditText) findViewById(R.id.etMessage);
sendEmail = (Button) findViewById(R.id.bSendEmail);
}
public void onClick(View v)
{
// TODO Auto-generated method stub
msgSend = message.getText().toString();
subjectSend = subject.getText().toString();
Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND);
emailIntent.putExtra(android.content.Intent.EXTRA_EMAIL, emailaddress);
emailIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, subjectSend);
emailIntent.setType("plain/text");
emailIntent.putExtra(android.content.Intent.EXTRA_TEXT, msgSend);
startActivity(emailIntent);
}
@Override
protected void onPause()
{
// TODO Auto-generated method stub
super.onPause();
finish();
}
这是处理电子邮件的类。
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:id="@+id/emailView" >
<EditText
android:id="@+id/etSubject"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:hint="@string/subject_hint">
</EditText>
<EditText
android:id="@+id/etMessage"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="textMultiLine"
android:lines="15"
android:gravity="top|left"
android:hint="@string/message_hint"/>
<Button
android:id="@+id/bSendEmail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="@string/send_email" />
这是我的电子邮件视图
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.packagename"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_shacs_metal"
android:label="@string/app_name"
android:theme="@style/AppTheme"
>
<activity
android:name="com.packagename.Tabs"
android:label="@string/app_name" >
<intent-filter>
<action android:name="com.packagename.Tabs" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name="com.packagename.Splash"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.packagename.Email"
android:label="@string/app_name" >
</activity>
</application>
<uses-permission android:name="android.permission.INTERNET" />
我得到的唯一错误是“Intent ourIntent = new Intent（Tabs.this，ourClass）;”。 Tabs.this带有下划线，错误显示“在范围内无法访问Tabs类型的封闭实例”。我已经尝试设置案例3没有意图并尝试捕获，但它也不适用。我将在下面发布我尝试的备用案例三。
case 3:
emailView.findViewById(R.id.emailView);
return emailView;
感谢您查看我的问题。任何帮助表示赞赏。
答案 0 :(得分：0)
此处无法访问您的标签上下文，请尝试使用getActivity（）作为上下文：
case 3:
emailView.findViewById(R.id.emailView);
Class ourClass = Class.forName("com.packagename.Email");
try
{
//change this
//Intent ourIntent = new Intent(Tabs.this, ourClass);
//to
Intent ourIntent = new Intent(getActivity(), ourClass);
getActivity().startActivity(ourIntent);
}
catch(ClassNotFoundException e)
{
e.printStackTrace();
}
return emailView;