Question

我正试图在我的Android项目中做一些标签。这是我的标签主页：

public class EventDetailMain extends FragmentActivity {
Context context = this;

ViewPager Tab;
EventDtlTabPagerAdapter TabAdapter;
ActionBar actionBar;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.event_detail_main);
    TabAdapter = new EventDtlTabPagerAdapter(getSupportFragmentManager());
    Tab = (ViewPager) findViewById(R.id.pager);
    Tab.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
        @Override
        public void onPageSelected(int position) {
            actionBar = getActionBar();
            actionBar.setSelectedNavigationItem(position);
        }
    });
    Tab.setAdapter(TabAdapter);
    actionBar = getActionBar();
    // Enable Tabs on Action Bar
    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
    ActionBar.TabListener tabListener = new ActionBar.TabListener() {
        public void onTabReselected(android.app.ActionBar.Tab tab,
                android.app.FragmentTransaction ft) {
        }

        public void onTabSelected(android.app.ActionBar.Tab tab,
                android.app.FragmentTransaction ft) {
            // on tab selected show respected fragment view
            Tab.setCurrentItem(tab.getPosition());
        }

        public void onTabUnselected(android.app.ActionBar.Tab tab,
                android.app.FragmentTransaction ft) {
        }
    };

    // Add New Tab
    actionBar.addTab(actionBar.newTab().setText("Event Detail")
            .setTabListener(tabListener));
    actionBar.addTab(actionBar.newTab().setText("Chat Room")
            .setTabListener(tabListener));
    actionBar.addTab(actionBar.newTab().setText("Drop Review")
            .setTabListener(tabListener));
}

我的第一个标签的内容：

public class EventDetail extends Fragment {
Context context;
View eventDetail;

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

    eventDetail = inflater.inflate(R.layout.event_detail, container, false);
    context = this;
    Intent i = getIntent();
    Event eventModel = (Event) i.getSerializableExtra("eventObj");
}

}

但是，我收到错误消息“类型不匹配：无法从EventDetail转换为Context”在context = this和“getIntent（）方法getIntent（）未定义类型EventDetail”。

有什么想法吗？是因为我没有扩展活动吗？

提前致谢。

修改

我收到错误消息：

11-13 20:24:49.634: E/AndroidRuntime(16503): FATAL EXCEPTION: main
11-13 20:24:49.634: E/AndroidRuntime(16503): java.lang.NullPointerException
11-13 20:24:49.634: E/AndroidRuntime(16503):    at android.support.v4.app.FragmentStatePagerAdapter.instantiateItem(FragmentStatePagerAdapter.java:116)
11-13 20:24:49.634: E/AndroidRuntime(16503):    at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:837)
11-13 20:24:49.634: E/AndroidRuntime(16503):    at android.support.v4.view.ViewPager.populate(ViewPager.java:1053)
11-13 20:24:49.634: E/AndroidRuntime(16503):    at android.support.v4.view.ViewPager.populate(ViewPager.java:919)
11-13 20:24:49.634: E/AndroidRuntime(16503):    at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1441)
11-13 20:24:49.634: E/AndroidRuntime(16503):    at android.view.View.measure(View.java:12892)
11-13 20:24:49.634: E/AndroidRuntime(16503):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698)
11-13 20:24:49.634: E/AndroidRuntime(16503):    at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
11-13 20:24:49.634: E/AndroidRuntime(16503):    at android.view.View.measure(View.java:12892)
11-13 20:24:49.634: E/AndroidRuntime(16503):    at android.widget.LinearLayout.measureVertical(LinearLayout.java:812)
11-13 20:24:49.634: E/AndroidRuntime(16503):    at android.widget.LinearLayout.onMeasure(LinearLayout.java:553)
11-13 20:24:49.634: E/AndroidRuntime(16503):    at android.view.View.measure(View.java:12892)
11-13 20:24:49.634: E/AndroidRuntime(16503):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698)
11-13 20:24:49.634: E/AndroidRuntime(16503):    at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
11-13 20:24:49.634: E/AndroidRuntime(16503):    at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2257)
11-13 20:24:49.634: E/AndroidRuntime(16503):    at android.view.View.measure(View.java:12892)
11-13 20:24:49.634: E/AndroidRuntime(16503):    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1240)
11-13 20:24:49.634: E/AndroidRuntime(16503):    at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2628)
11-13 20:24:49.634: E/AndroidRuntime(16503):    at android.os.Handler.dispatchMessage(Handler.java:99)
11-13 20:24:49.634: E/AndroidRuntime(16503):    at android.os.Looper.loop(Looper.java:137)
11-13 20:24:49.634: E/AndroidRuntime(16503):    at android.app.ActivityThread.main(ActivityThread.java:4512)
11-13 20:24:49.634: E/AndroidRuntime(16503):    at java.lang.reflect.Method.invokeNative(Native Method)
11-13 20:24:49.634: E/AndroidRuntime(16503):    at java.lang.reflect.Method.invoke(Method.java:511)
11-13 20:24:49.634: E/AndroidRuntime(16503):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:982)
11-13 20:24:49.634: E/AndroidRuntime(16503):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:749)
11-13 20:24:49.634: E/AndroidRuntime(16503):    at dalvik.system.NativeStart.main(Native Method)

Answer 1

是。在Fragment中你有getActivity（）。从那里你可以使用getIntent（）。

修改所以：第一个错误 - context = this; 应该是 context = getActivity（）; 第二个错误 - getIntent（）应该是 getActivity（）。getIntent（）;

EDIT2：所以你有第三个错误：D你需要返回一个视图：

return eventDetail;

而且，你没有在任何地方使用eventModel。

Answer 2

您需要setArguments将片段附加到Fragmentmanager，然后您可以将Bundle作为参数发送。

Bundle bundle = new Bundle();
EventDetail  toOpenFragment = new EventDetail();
bundle.putInt("index", 1);
toOpenFragment.setArguments(bundle);

并在片段使用中接收此传递的int，如此。

final int index = getArguments().getInt("index");

Answer 3

只需通过调用

来使用您的活动意图即可

 getActivity.getIntent();
Intent  catid_intent ;    


catid_intent = getActivity().getIntent();
  //  sharePref = SharePref.getInstance(getActivity());
    String cat_id = catid_intent.getStringExtra("cat_id");
    Toast.makeText(getActivity(), "Cat id premium" + cat_id, Toast.LENGTH_LONG).show();

Android标签视图无法获取内容（）

3 个答案: