java Activity 未分配给 Android.app.Activity Manifest XML
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Activity is not assigned to Android.app.Activity Manifest XML
提问by hyperfkcb
I am having some trouble with the fragment in Android Studio. So basically this is my MainActivity:
我在 Android Studio 中遇到了片段问题。所以基本上这是我的 MainActivity：
public class MainActivity extends FragmentActivity {
final Context context = this;
ViewPager Tab;
TabPagerAdapter TabAdapter;
ActionBar actionBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TabAdapter = new TabPagerAdapter(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() {
@Override
public void onTabReselected(android.app.ActionBar.Tab tab,
android.app.FragmentTransaction ft) {
}
@Override
public void onTabSelected(android.app.ActionBar.Tab tab,
android.app.FragmentTransaction ft) {
// on tab selected show respected fragment view
Tab.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(android.app.ActionBar.Tab tab,
android.app.FragmentTransaction ft) {
}
};
// Add New Tab
actionBar.addTab(actionBar.newTab().setText("Feedback")
.setTabListener(tabListener));
actionBar.addTab(actionBar.newTab().setText("History Log")
.setTabListener(tabListener));
}
}
And then my another class which is one of the tab code:
然后是我的另一个类，它是选项卡代码之一：
public class FeedbackMain extends Fragment {
View feedbackMainView;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
feedbackMainView = inflater.inflate(R.layout.activity_feedback_main,
container, false);
return feedbackMainView;
}
}
And then my Manifest:
然后是我的清单：
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
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=".FeedbackMain"
android:label="@string/title_activity_feedback_main" >
</activity>
However, I am getting red lines under .FeedbackMain and the error message is:
但是，我在 .FeedbackMain 下看到了红线，错误消息是：
.FeedbackMain is not assignable to 'android.app.Activity'
I was wondering why is it so? It was working fine with Android development tools but then when I switched to Android Studio, this happens.
我想知道为什么会这样？它在 Android 开发工具上运行良好，但是当我切换到 Android Studio 时，发生了这种情况。
Thanks in advance.
提前致谢。
Edit
编辑
xml file for mainActivity:
mainActivity 的 xml 文件：
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.view.ViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
style.xml:
样式.xml：
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
</style>
</resources>
回答by Durga Mohan
Firstly, you only declare activities in manifest file, not fragments. So remove this line from manifest file
首先，您只在清单文件中声明活动，而不是片段。所以从清单文件中删除这一行
<activity
android:name=".FeedbackMain"
android:label="@string/title_activity_feedback_main" >
</activity>
Secondly, if you want to use actionbar, you class should extend ActionBarActivity not FragmentActivity. so change your mainactivity from
其次，如果你想使用 actionbar，你的类应该扩展 ActionBarActivity 而不是 FragmentActivity。所以改变你的主要活动
public class MainActivity extends FragmentActivity {
to
到
public class MainActivity extends ActionBarActivity{
then make sure you call getSupportActionBar()if you are using support library
getSupportActionBar()如果您正在使用支持库，请确保您致电
EDIT:
编辑：
ActionBar.TabListener tabListener = new ActionBar.TabListener() {
@Override
public void onTabReselected(
android.support.v7.app.ActionBar.Tab arg0,
FragmentTransaction arg1) {
// TODO Auto-generated method stub
}
@Override
public void onTabSelected(
android.support.v7.app.ActionBar.Tab arg0,
FragmentTransaction arg1) {
// TODO Auto-generated method stub
}
@Override
public void onTabUnselected(
android.support.v7.app.ActionBar.Tab arg0,
FragmentTransaction arg1) {
// TODO Auto-generated method stub
}
};
回答by Jorgesys
this error is caused because FeedBackMainis declared as Activitynot as a Fragment
这个错误是因为FeedBackMain被声明为Activitynot as aFragment
<activity
android:name=".FeedbackMain"
android:label="@string/title_activity_feedback_main" >
</activity>
if you really want use it as ActivityChange
如果你真的想用它作为ActivityChange
public class FeedbackMain extends Fragment {
to
到
public class FeedbackMain extends FragmentActivity {
but if you want use it as Fragmentjust delete the declaration inside your AndroidManifest.xml
但如果你想使用它作为Fragment只是删除你的声明AndroidManifest.xml
use actionBar = getSupportActionBar();instead of getActionBar()
使用actionBar = getSupportActionBar();代替getActionBar()
You need some method implementations:
您需要一些方法实现：
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) {
}
@Override
public void onTabReselected(
android.support.v7.app.ActionBar.Tab arg0,
FragmentTransaction arg1) {
// TODO Auto-generated method stub
}
@Override
public void onTabSelected(
android.support.v7.app.ActionBar.Tab arg0,
FragmentTransaction arg1) {
// TODO Auto-generated method stub
}
@Override
public void onTabUnselected(
android.support.v7.app.ActionBar.Tab arg0,
FragmentTransaction arg1) {
// TODO Auto-generated method stub
}
};
回答by Bidhan
Remove
消除
<activity
android:name=".FeedbackMain"
android:label="@string/title_activity_feedback_main" >
</activity>
from your Manifest file. Since FeebackMain is a Fragment and not an Activity, you don't need to define it inside your Manifest.
来自您的清单文件。由于 FeebackMain 是一个 Fragment 而不是一个 Activity，你不需要在你的 Manifest 中定义它。
回答by AlexWalterbos
FeedbackMainis a Fragment, not an Activity. You don't have to declare it in your Manifest file. I don't know why that behavior changed when you switched to Android Studio, but that is what it is complaining about.
FeedbackMain是Fragment，不是Activity。您不必在 Manifest 文件中声明它。我不知道为什么当您切换到 Android Studio 时这种行为会发生变化，但这就是它所抱怨的。
