导航抽屉 - 片段未显示

Question

EDITED -2

就像之前的那个一样，我试着做你在我给的第一个上所做的事情，并搜索了一些关于将一个Activity转换为Fragment的指令，但我得到的只是一堆错误。另外，你有一个很好的源教程或有关转换这类文件的信息吗？我真的很感激。

    public class Lesson111 extends Activity{

    private RadioGroup radioAnswerGroup;
    private RadioButton radioAnswerButton;
    private Button btnSubmit;

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

        addListenerOnButton();

    }

    public void addListenerOnButton() {

        radioAnswerGroup = (RadioGroup) findViewById(R.id.radioAnswer);
        btnSubmit = (Button) findViewById(R.id.btnSubmit);

        btnSubmit.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {

                // get selected radio button from radioGroup
                int selectedId = radioAnswerGroup.getCheckedRadioButtonId();

                // find the radiobutton by returned id
                radioAnswerButton = (RadioButton) findViewById(selectedId);

                Toast.makeText(Lesson111.this,
                        radioAnswerButton.getText(), Toast.LENGTH_SHORT).show();

            }

        });

    }
}

这是主要活动

public class NavigationActivity extends FragmentActivity {

    private DrawerLayout mDrawerLayout;
    ImageView home;
    Fragment fragment = null;
    TextView appname;
    ExpandableListView expListView;
    HashMap<String, List<String>> listDataChild;
    ExpandableListAdapter listAdapter;
    List<String> listDataHeader;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_navigation);
        home = (ImageView)findViewById(R.id.home);
        home.setOnClickListener(homeOnclickListener);
        appname = (TextView)findViewById(R.id.appname);
        setUpDrawer();
    }

    /**
     * 
     * Get the names and icons references to build the drawer menu...
     */
    private void setUpDrawer() {
        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
        mDrawerLayout.setScrimColor(getResources().getColor(android.R.color.transparent));
        mDrawerLayout.setDrawerListener(mDrawerListener);
        expListView = (ExpandableListView) findViewById(R.id.lvExp);
        prepareListData();
        listAdapter = new ExpandableListAdapter(this, listDataHeader, listDataChild);
        // setting list adapter
        expListView.setAdapter(listAdapter);
        fragment = new Lesson1();
        getSupportFragmentManager().beginTransaction().replace(R.id.content_frame, fragment).commit();
        mDrawerLayout.closeDrawer(expListView);

        expListView.setOnChildClickListener(new OnChildClickListener() {
            @Override
            public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
                switch (groupPosition) {
                case 0:
                    switch (childPosition) {
                    case 0:
                        fragment = new Lesson1();
                        break;
                    case 1:
                        fragment = new Lesson11();
                        break;
                    case 2:
                        Activity activity = new Lesson111();
                        break;
                    default:
                        break;
                    }
                    break;

这不是整个代码。但我相信片段没有显示的原因是因为这个案例陈述。我错过了什么吗？

Answer 1

您的代码中存在拼写错误，请使用Inflater代替inflater

View rootView = Inflater.inflate(R.layout.twopointthree, null);

在您的代码中替换为此。

EDIT - 2，Lesson111 as Fragment

试试这个

public class Lesson111 extends Fragment{
private RadioGroup radioGroup;


public View onCreateView(LayoutInflater Inflater, ViewGroup container,Bundle savedInstanceState) {
    View rootView = Inflater.inflate(R.layout.twopointthree, null);

    /* Initialize Radio Group and attach click handler */
    radioGroup = (RadioGroup) rootView.findViewById(R.id.radioGroup);
    radioGroup.clearCheck();

    /* Attach CheckedChangeListener to radio group */
    radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(RadioGroup group, int checkedId) {
            RadioButton rb = (RadioButton) group.findViewById(checkedId);
            if(null!=rb && checkedId > -1){
                Toast.makeText(Lesson111.this, rb.getText(), Toast.LENGTH_SHORT).show();
            }

        }
    });
    return rootView;
}

public void onClear(View v) {
    /* Clears all selected radio buttons to default */
    radioGroup.clearCheck();
}

public void onSubmit(View v) {
    RadioButton rb = (RadioButton) radioGroup.findViewById(radioGroup.getCheckedRadioButtonId());
    Toast.makeText(Lesson111.this, rb.getText(), Toast.LENGTH_SHORT).show();
}
}

在您的主要活动中替换

  case 2:
  Activity activity = new Lesson111();

与

  case 2:
  fragment = new Lesson111();