以编程方式将片段添加到 android 中的框架布局
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Programmatically adding fragment to framelayout in android
提问by Mike Baxter
I am trying to build a UI combining both static and dynamic elements. For this, I have divided my activity into fragments - all app navigation is then done by replacing fragments instead of navigating between activities.
我正在尝试构建一个结合静态和动态元素的 UI。为此，我将我的活动划分为片段 - 然后通过替换片段而不是在活动之间导航来完成所有应用导航。
In my main activity layout, I am using a FrameLayout:
在我的主要活动布局中，我使用了一个FrameLayout：
<FrameLayout
android:id="@+id/mainframe"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:layout_below="@id/topsection"
android:layout_above="@id/lowersection" />
I have a fragment declared as such:
我有一个这样声明的片段：
public class MyFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragmentlayout, container, false);
}
}
Then, in my main activity (which extends FragmentActivity and uses the import android.support.v4.app.FragmentActivity, I am attempting to load this fragment into the frame layout.
然后，在我的主要活动（扩展 FragmentActivity 并使用 import ）中android.support.v4.app.FragmentActivity，我试图将此片段加载到框架布局中。
MyFragment myf = new MyFragment();
FragmentTransaction transaction = getFragmentManager().beginTransaction();
transaction.add(R.id.mainframe, myf);
transaction.commit();
I have followed this from many other examples, however I am receiving a compiler error on the transaction.add()command, which nobody else seems to have encountered.
我已经从许多其他示例中遵循了这一点，但是我在transaction.add()命令中收到了编译器错误，其他人似乎没有遇到过。
The error I am receiving is: The method add(int, Fragment) in the type FragmentTransaction is not applicable for the arguments (int, MyFragment).
我收到的错误是：The method add(int, Fragment) in the type FragmentTransaction is not applicable for the arguments (int, MyFragment)。
Why is this? The MyFragmentclass extends Fragmentso I would've thought this would work. What am I doing wrong?
为什么是这样？在MyFragment类扩展Fragment，所以我会一直认为这是可行的。我究竟做错了什么？
Edit: The imports for my main activity are:
编辑：我的主要活动的进口是：
import org.joda.time.DateTime;
import android.app.FragmentTransaction;
import android.database.Cursor;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.app.FragmentActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;
回答by Steve Benett
Check your imports. Use android.support.v4.app.FragmentTransactioninstead of android.app.FragmentTransaction.
检查您的进口。使用android.support.v4.app.FragmentTransaction代替android.app.FragmentTransaction。
Furthermore be sure you are using android.support.v4.app.Fragmentand calling getSupportFragmentManager(). It's easy to miss this calls / imports. Thx to saiful103a with the hint of the FragmentManager.
此外，请确保您正在使用android.support.v4.app.Fragment和调用getSupportFragmentManager(). 很容易错过这个调用/导入。用 FragmentManager 的提示向 saiful103a 表示感谢。
