Java setContentView（int）不工作

我正在努力完成一个教程，但遇到了一些困难。教程 实现一个类SingleFragmentActivity来承载一个片段（附带xml文件）

我的问题是在这个SingleFragmentActivity.java类中，有一个对setContentView（int）的调用抛出了一个错误，它说它找不到方法。setContentView（int）不是片段类的一部分吗

import android.app.Fragment;

导入android.app.FragmentManager； 导入android.os.Bundle

public abstract class SingleFragmentActivity extends Fragment {
   protected abstract Fragment createFragment();

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_fragment);

    FragmentManager manager = getFragmentManager();
    Fragment fragment = manager.findFragmentById(R.id.fragmentContainer);

    if (fragment == null) {
        fragment = createFragment();
        manager.beginTransaction()
            .add(R.id.fragmentContainer, fragment)
            .commit();
    }
  }
}

---

.app.Fragment

的视图已在

onCreateView

中初始化。基本上，您需要使用充气器充气视图，并在

onCreateView

中将其作为根视图返回

以及链接中的示例

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    if (container == null) {
        // We have different layouts, and in one of them this
        // fragment's containing frame doesn't exist.  The fragment
        // may still be created from its saved state, but there is
        // no reason to try to create its view hierarchy because it
        // won't be displayed.  Note this is not needed -- we could
        // just run the code below, where we would create and return
        // the view hierarchy; it would just never be used.
        return null;
    }

    ScrollView scroller = new ScrollView(getActivity());
    TextView text = new TextView(getActivity());
    int padding = (int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
            4, getActivity().getResources().getDisplayMetrics());
    text.setPadding(padding, padding, padding, padding);
    scroller.addView(text);
    text.setText(Shakespeare.DIALOGUE[getShownIndex()]);
    return scroller;
}

---

此外，如果要使用

setContentView

，请使用支持库中的

FragmentActivity

。

.app.Fragment

的视图在

onCreateView

中初始化。基本上，您需要使用充气器充气，以根视图的形式返回

onCreateView

以及链接中的示例

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    if (container == null) {
        // We have different layouts, and in one of them this
        // fragment's containing frame doesn't exist.  The fragment
        // may still be created from its saved state, but there is
        // no reason to try to create its view hierarchy because it
        // won't be displayed.  Note this is not needed -- we could
        // just run the code below, where we would create and return
        // the view hierarchy; it would just never be used.
        return null;
    }

    ScrollView scroller = new ScrollView(getActivity());
    TextView text = new TextView(getActivity());
    int padding = (int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
            4, getActivity().getResources().getDisplayMetrics());
    text.setPadding(padding, padding, padding, padding);
    scroller.addView(text);
    text.setText(Shakespeare.DIALOGUE[getShownIndex()]);
    return scroller;
}

---

此外，如果要使用

setContentView

，请使用支持库中的

FragmentActivity

。

.app.Fragment

的视图在

onCreateView

中初始化。基本上，您需要使用充气器充气，以根视图的形式返回

onCreateView

以及链接中的示例

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    if (container == null) {
        // We have different layouts, and in one of them this
        // fragment's containing frame doesn't exist.  The fragment
        // may still be created from its saved state, but there is
        // no reason to try to create its view hierarchy because it
        // won't be displayed.  Note this is not needed -- we could
        // just run the code below, where we would create and return
        // the view hierarchy; it would just never be used.
        return null;
    }

    ScrollView scroller = new ScrollView(getActivity());
    TextView text = new TextView(getActivity());
    int padding = (int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
            4, getActivity().getResources().getDisplayMetrics());
    text.setPadding(padding, padding, padding, padding);
    scroller.addView(text);
    text.setText(Shakespeare.DIALOGUE[getShownIndex()]);
    return scroller;
}

---

此外，如果要使用

setContentView

，请使用支持库中的

FragmentActivity

。

.app.Fragment

的视图在

onCreateView

中初始化。基本上，您需要使用充气器充气，以根视图的形式返回

onCreateView

以及链接中的示例

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    if (container == null) {
        // We have different layouts, and in one of them this
        // fragment's containing frame doesn't exist.  The fragment
        // may still be created from its saved state, but there is
        // no reason to try to create its view hierarchy because it
        // won't be displayed.  Note this is not needed -- we could
        // just run the code below, where we would create and return
        // the view hierarchy; it would just never be used.
        return null;
    }

    ScrollView scroller = new ScrollView(getActivity());
    TextView text = new TextView(getActivity());
    int padding = (int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
            4, getActivity().getResources().getDisplayMetrics());
    text.setPadding(padding, padding, padding, padding);
    scroller.addView(text);
    text.setText(Shakespeare.DIALOGUE[getShownIndex()]);
    return scroller;
}

---

此外，如果要使用

setContentView

，请使用支持库中的

FragmentActivity

。

这样做是错误的。setContentView（int）适用于

Activity

，但您的类正在扩展Fragment，因此需要膨胀xml并在

onCreateView

中返回视图

例如：

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout. activity_fragment, container, false);
        // Do some Initialization
        return view;
    }

---

还有一点需要注意的是，不要用Activity来命名你的片段类。这会让你感到困惑：）

你做得不对。setContentView（int）将用于

活动

，但您的类正在扩展片段，因此您需要膨胀xml并在

onCreateView中返回视图

例如：

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout. activity_fragment, container, false);
        // Do some Initialization
        return view;
    }

---

请注意，不要用Activity命名片段类。这会让你困惑：）

你做得不对。setContentView（int）将用于

活动

，但您的类正在扩展片段，因此您需要膨胀xml并在

onCreateView中返回视图

例如：

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout. activity_fragment, container, false);
        // Do some Initialization
        return view;
    }

---

请注意，不要用Activity命名片段类。这会让你困惑：）

你做得不对。setContentView（int）将用于

活动

，但您的类正在扩展片段，因此您需要膨胀xml并在

onCreateView中返回视图

例如：

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout. activity_fragment, container, false);
        // Do some Initialization
        return view;
    }

---

请注意，不要用Activity命名片段类。这会让您感到困惑：）

setContentView

不是

片段的成员。要为片段膨胀视图，膨胀后需要将视图返回到
onCreateView
：

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    return inflater.inflate(R.layout.fragment_layout, container, false);
}

setContentView
不是
Fragment
的成员。要为片段膨胀视图，膨胀后需要将视图返回到
onCreateView
：

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    return inflater.inflate(R.layout.fragment_layout, container, false);
}

setContentView
不是
Fragment
的成员。要为片段膨胀视图，膨胀后需要将视图返回到
onCreateView
：

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    return inflater.inflate(R.layout.fragment_layout, container, false);
}

setContentView
不是
Fragment
的成员。要为片段膨胀视图，膨胀后需要将视图返回到
onCreateView
：

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    return inflater.inflate(R.layout.fragment_layout, container, false);
}

Fragment使用onCreateView（）并充气而不是onCreate（），onContentView（）专门用于活动
Fragment使用onCreateView（）并充气而不是onCreate（），onContentView（）专门用于活动
Fragment使用onCreateView（）并充气而不是onCreate（）而专门针对活动的onContentView（）片段使用onCreateView（）并充气，而不是专门针对活动的onCreate（）和onContentView（）