从android中的fragment管理工具栏的导航和后退按钮

我所有的片段都是通过控制的ActionBarActivity(mainActivity)，在 mainActivity 内DrawerLayout已实现，所有子片段均通过抽屉布局的列表项单击推送。我面临的问题是通过抽屉布局推送片段后我想将抽屉图标更改为后退图标ToolBar以便用户可以导航到上一个片段并处理回调android.R.id.home在同一个片段内或在 mainActivity 内。

我正在使用的代码是：

MainActivity.java

public class MainActivity extends ActionBarActivity {
    private DrawerLayout layoutDrawer;
    private ActionBarDrawerToggle drawerToggler;
    private Stack<Fragment> stack;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        stack = new Stack<Fragment>();
        layoutDrawer = (DrawerLayout) findViewById(R.id.layout_drawer);
        drawerToggler = new ActionBarDrawerToggle(this, layoutDrawer, toolbar,
                R.string.app_name, R.string.app_name);
        layoutDrawer.setDrawerListener(drawerToggler);

        setUpDrawerList();
        pushFragment(new FirstFragment(), true);

        Session.setContext(getApplicationContext());
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (drawerToggler.isDrawerIndicatorEnabled()
                && drawerToggler.onOptionsItemSelected(item))
            return true;
        switch (item.getItemId()) {
        case android.R.id.home:
            Toast.makeText(this, "Back from activity", Toast.LENGTH_SHORT)
                    .show();
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    protected void onPostCreate(Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        drawerToggler.syncState();
    }

    @Override
    public void onBackPressed() {
        popFragment();
    }

    private void setUpDrawerList() {
        ListView listView = (ListView) findViewById(R.id.list_drawer);
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1,
                Arrays.asList(new String[] { "First Fragment",
                        "Second Fragment" }));
        listView.setAdapter(adapter);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                layoutDrawer.closeDrawers();
                drawerToggler.setDrawerIndicatorEnabled(false);
                getSupportActionBar().setDisplayHomeAsUpEnabled(true);
                pushFragment(getFragment(position), true);
            }
        });
    }

    private Fragment getFragment(int pos) {
        switch (pos) {
        case 0:
            return new FirstFragment();
        case 1:
            return new SecondFragment();
        }
        return null;
    }

    public void pushFragment(Fragment fragment, boolean add) {
        FragmentTransaction transation = getSupportFragmentManager()
                .beginTransaction();
        if (add)
            stack.push(fragment);
        transation.replace(R.id.layout_content, fragment);
        transation.commit();
    }

    public void popFragment() {
        if (!stack.isEmpty()) {
            Fragment fragment = stack.elementAt(stack.size() - 2);
            stack.pop();
            pushFragment(fragment, false);
        } else
            super.onBackPressed();
        drawerToggler.setDrawerIndicatorEnabled(stack.size() == 1);
    }

    public void clearBackStack() {
        stack.clear();
    }
}

FirstFragment.java

public class FirstFragment extends Fragment {

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        setHasOptionsMenu(true);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_first, container, false);
    }

    @Override
    public void onResume() {
        super.onResume();
        ActionBar actionBar = ((ActionBarActivity)getActivity()).getSupportActionBar();
        actionBar.setTitle("First Fragment");
        actionBar.setDisplayHomeAsUpEnabled(true);
        actionBar.setHomeButtonEnabled(true);
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        super.onCreateOptionsMenu(menu, inflater);
        menu.clear();
        inflater.inflate(R.menu.fragment_menu, menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch(item.getItemId()) {
        case android.R.id.home:
            Toast.makeText(getActivity(), "Back from fragment", Toast.LENGTH_SHORT).show();
            getActivity().onBackPressed();
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

从上面的代码我无法得到回调android.R.id.home并且设置主页按钮并不每次都起作用actionBar.setDisplayHomeAsUpEnabled(true); actionBar.setHomeButtonEnabled(true);

任何帮助将不胜感激。

Thanks

将工具栏添加到您的 xml

<android.support.v7.widget.Toolbar
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="?attr/actionBarSize"
    android:background="?attr/colorPrimary"
    android:theme="@style/ThemeOverlay.AppCompat.ActionBar"
    app:popupTheme="@style/ThemeOverlay.AppCompat.Light">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Fragment title"/>

</android.support.v7.widget.Toolbar>

然后在 Fragment 的 onCreateView 方法中：

Toolbar toolbar = view.findViewById(R.id.toolbar);
toolbar.setNavigationIcon(R.drawable.ic_back_button);
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
         getActivity().onBackPressed();
    }
});