Question

我已成功使用抽屉布局设置导航抽屉。我发现删除这一简单的代码行会将汉堡包图标更改为后退按钮：

mDrawerToggle.syncState();

然而，当我点击后退按钮时，我确实想要返回上一个活动时仍然打开导航抽屉。

我知道我可以简单地设置一个onClickListener，但我认为Android有更原生的方式导航到上一个屏幕。这是我的代码：＆＃39;

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

在您的onOptionsItemSelected()抽屉活动中：

@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);
}

使用DrawerLayout后退按钮返回上一个活动

1 个答案: