工具栏的注意事项打开导航菜单

Question

我在我的应用程序中使用了v7.widget.Toolbar，但我收到了一些时髦的功能。我有我的主要活动和放在它上面的碎片。当backStack上没有碎片时，汉堡按钮显示，菜单正常工作。当我向backStack添加一个片段时，上面的脱字符号正确显示，但是当单击上方的脱字符时，导航菜单将打开，而不是从堆栈弹出片段。

现在，如果有一个真正的答案，我会接受它，但在这一点上，我将采取hackish的解决方案。我尝试添加一个监听器，这样我知道何时按下了操作栏按钮，但这只是使得片段弹出，页面返回，但导航菜单仍然打开。 onOptionsItemSelected没有被调用（由于我实现抽屉切换的方式，但这样做“正确”的方式给了我更多的问题，比如根本没有导航菜单显示在主页上）。

概括起来为清楚：向上插入符打开导航菜单，而不是去背。

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

    mTitle = getTitle(); 
    toolbar = (Toolbar) findViewById(R.id.tool_bar); // Attaching the layout to the toolbar object 
    frameLayout = (FrameLayout) findViewById(R.id.frame_layout); 
    setSupportActionBar(toolbar); 

    //Listen for changes in the back stack 
    getSupportFragmentManager().addOnBackStackChangedListener(new FragmentManager.OnBackStackChangedListener() { 
     @Override 
     public void onBackStackChanged() { 
      shouldDisplayHomeUp(); 
     } 
    }); 

    mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); 
    mDrawerContent = findViewById(R.id.drawer_content); 
    mDrawerList = (ListView) findViewById(R.id.drawer_list); 

    mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START); 
    mDrawerList.setAdapter(new DrawerListItemAdapter(DRAWER_ITEMS, getApplicationContext())); 

    mDrawerList.setOnItemClickListener(new DrawerItemClickListener()); 
    mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, toolbar, R.string.openDrawer, R.string.closeDrawer) { 

     public void onDrawerClosed(View view) { 
      invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu() 
     } 

     public void onDrawerOpened(View drawerView) { 
      invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu() 
      Log.d("Main", "Open Menu"); 
     } 

    }; 
    mDrawerToggle.syncState(); 
    mDrawerLayout.setDrawerListener(mDrawerToggle); 
} 

    @Override 
public void onBackStackChanged() { 
    shouldDisplayHomeUp(); 
} 

public void shouldDisplayHomeUp(){ 
    //Enable Up button only if there are entries in the back stack 
    boolean canback = getSupportFragmentManager().getBackStackEntryCount()>0; 
    ActionBar ab = getSupportActionBar(); 
    if(ab != null){ 
     ab.setDisplayHomeAsUpEnabled(canback); 
    } 
    if(!canback){ 
     //App can crash as mDrawerToggle will be null when app launches 
     try{ 
      mDrawerToggle.syncState(); 
     }catch (Exception e){ 
      e.printStackTrace(); 
     } 
    } 
    Log.d("Main", "shouldDisplayHomeUp"); 
} 

@Override 
public boolean onSupportNavigateUp() { 
    //This method is called when the up button is pressed. Just the pop back stack. 
    Log.d("Main", "Up carat pressed"); 
    getSupportFragmentManager().popBackStack(); 
    return true; 
} 

@Override 
protected void onPostCreate(Bundle savedInstanceState) { 
    super.onPostCreate(savedInstanceState); 
    // Sync the toggle state after onRestoreInstanceState has occurred. 
    mDrawerToggle.syncState(); 
} 

@Override 
public void onConfigurationChanged(Configuration newConfig) { 
    super.onConfigurationChanged(newConfig); 
    // Pass any configuration change to the drawer toggls 
    mDrawerToggle.onConfigurationChanged(newConfig); 
} 

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

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 

    int id = item.getItemId(); 
    Log.d("Main", "Menu item clicked: " + Integer.toString(item.getItemId())); 
    //noinspection SimplifiableIfStatement 
    if (id == R.id.action_settings) { 
     return true; 
    } 
    return super.onOptionsItemSelected(item); 
} 

，下面和this hacky answer工作对我来说

亚历克斯“的回答的组合（包括他在回答评论）的解决方案。

Answer 1

您可以使用setToolbarNavigationClickListener() - 它设置一个处理当点击抽屉指标是禁用听者

drawerToggle.setToolbarNavigationClickListener((View view) -> { 
     getSupportFragmentManager().popBackStack(); 
    });