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T'm尝试一个非常简单的事情。通过java代码添加一个片段。但它显示我错误（fragmentTransaction.add（R.id.fragment_container，fragment）;）。我无法理解这里有什么问题。请帮忙。有两个类，主类和片段类。两种布局主要布局和片段布局。将片段添加到Android
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.chetan.fragmentprtc.MainActivity">
<fragment
android:id="@+id/fragment_container"
android:name="android.app.DialogFragment"
android:layout_width="368dp"
android:layout_height="495dp"
tools:layout_editor_absoluteX="8dp"
tools:layout_editor_absoluteY="8dp" />
</android.support.constraint.ConstraintLayout>
package com.example.chetan.fragmentprtc;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction =
fragmentManager.beginTransaction();
BlankFragment fragment = new BlankFragment();
fragmentTransaction.add(R.id.fragment_container, fragment);
fragmentTransaction.commit();
}
}
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.chetan.fragmentprtc.BlankFragment">
<!-- TODO: Update blank fragment layout -->
<TextView
android:id="@+id/fragment1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="@string/hello_blank_fragment" />
</FrameLayout>
package com.example.chetan.fragmentprtc;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class BlankFragment extends Fragment {
public BlankFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_blank,container,false);
return view;
}
}
你好精灵！我已经更改了xlm文件中的代码。但是有一行错误：transaction.replace（R.id.fragment_container，fragment）; –