使用DrawerLayout后退按钮返回到上一个活动

Question

我已成功设置了使用抽屉布局的导航抽屉。我发现，删除的代码这个简单的线条改变了汉堡包图标后退按钮：

mDrawerToggle.syncState(); 

然而，当我点击后退按钮，它仍然是打开抽屉式导航栏，而实际上我想回到以前的活动。

我知道我可以简单地设置一个onClickListener，但我觉得Android有一个更原生的方式导航到前一个屏幕。这里是我的代码：”

的onCreate：

mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); 
    mDrawerToggle = new ActionBarDrawerToggle(
      this,     /* host Activity */ 
      mDrawerLayout,   /* DrawerLayout object */ 
      toolbar, /* nav drawer icon to replace 'Up' caret */ 
      R.string.drawer_open, /* "open drawer" description */ 
      R.string.drawer_close /* "close drawer" description */ 
    ) { 

     /** 
     * Called when a drawer has settled in a completely closed state. 
     */ 
     public void onDrawerClosed(View view) { 
      super.onDrawerClosed(view); 
      isOpen = false; 
     } 

     /** 
     * Called when a drawer has settled in a completely open state. 
     */ 
     public void onDrawerOpened(View drawerView) { 
      super.onDrawerOpened(drawerView); 
      isOpen = true; 
     } 
    }; 
    mDrawerLayout.addDrawerListener(mDrawerToggle); 

    mDrawerList = (ListView) findViewById(R.id.left_drawer); 
    ArrayList<String> drawerTitleArray = new ArrayList<>(); 
    drawerTitleArray.add(0, "TEST"); 
    drawerTitleArray.add(1, "TEST 1"); 
    // Set the adapter for the list view 
    mDrawerList.setAdapter(new ArrayAdapter<String>(this, 
      R.layout.drawer_list_item, drawerTitleArray)); 

其他：

@Override 
public boolean onOptionsItemSelected(MenuItem item){ 
    return mDrawerToggle.onOptionsItemSelected(item) || super.onOptionsItemSelected(item); 
} 


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

Answer 1

在你的抽屉活动onOptionsItemSelected()：

@Override 
public boolean onOptionsItemSelected(MenuItem item){ 
    if (item.getItemId() == android.R.id.home) { 
     super.onBackPressed(); 
     return true; 
    } 
    else 
     return mDrawerToggle.onOptionsItemSelected(item) || super.onOptionsItemSelected(item); 
}