Question

我有一个导航抽屉，我使用选择器来获取列表中的高位项目

<item
    android:state_activated="true"
    android:drawable="@color/pressed_color"/>
<item
    android:drawable="@color/default_color" />

问题在于我覆盖了反对以将我的片段更改为我的主元素，如下所示：

@Override
public void onBackPressed()
{

    onNavigationDrawerItemSelected(0);
    onSectionAttached(1);
    restoreActionBar();

现在当我按回它时会更改片段，但突出显示的项目会保留在我上次点击的位置。我如何才能更改高光位置？与somethig一样改变文本以某种方式从代码状态，但我用适配器创建导航抽屉元素...（我使用Android Studio示例）

    @Override
public void onNavigationDrawerItemSelected(final int position) {
    // update the main content by replacing fragments
  final  FragmentManager fragmentManager = getSupportFragmentManager();
    fragmentManager.beginTransaction()
            .replace(R.id.container, KedvencekFragment.newInstance(position + 1))
                    // .addToBackStack(null)
            .commit();
    if(position==0)
    {
        final Handler handler = new Handler();
        handler.postDelayed(new Runnable() {
            @Override
            public void run() {
                fragmentManager.beginTransaction()
                        .replace(R.id.container, KedvencekFragment.newInstance(position + 1))
                       // .addToBackStack(null)
                        .commit();
            }
        }, 250);

    }

和`public void onSectionAttached（int number）{ 开关（号码）{ 情况1： mTitle = getString（R.string.title_section1）;

            break;
        case 2:
            mTitle = getString(R.string.title_section2);
            break;
        case 3:
            mTitle = getString(R.string.title_section3);
            break;
        case 4:
            mTitle = getString(R.string.title_section4);
            break;
        case 5:
           // mTitle = getString(R.string.title_section5);
            break;
        case 6:
            mTitle = getString(R.string.title_section6);
            break;
    }
}`

Answer 1

修改

您可以在自己的活动中访问NavigationDrawerFragment，只需要selectItem(int position)公开NavigationDrawerFragment方法，就像这样：

... publicvoid selectItem(int position) { mCurrentSelectedPosition = position; if (mDrawerListView != null) { mDrawerListView.setItemChecked(position, true); } if (mDrawerLayout != null) { mDrawerLayout.closeDrawer(mFragmentContainerView); } if (mCallbacks != null) { mCallbacks.onNavigationDrawerItemSelected(position); } } ...

然后在你的onNavigationDrawerItemSelected方法中：

@Override public void onNavigationDrawerItemSelected(final int position) { // update the main content by replacing fragments final FragmentManager fragmentManager = getSupportFragmentManager(); fragmentManager.beginTransaction() .replace(R.id.container, KedvencekFragment.newInstance(position + 1)) // .addToBackStack(null) .commit(); if(position==0) { final Handler handler = new Handler(); handler.postDelayed(new Runnable() { @Override public void run() { fragmentManager.beginTransaction() .replace(R.id.container, KedvencekFragment.newInstance(position + 1)) // .addToBackStack(null) .commit(); } }, 250); } navigationDrawerFragment.selectItem(position); }

Answer 2

我找到了!!!必须将selectItem（）更改为public然后在onBackPressed中调用它，就像这样！

 @Override
public void onBackPressed()
{
    if(mTitle!=getString(R.string.title_section1)) {
        onNavigationDrawerItemSelected(0);
        onSectionAttached(1);

        mNavigationDrawerFragment.selectItem(0);

        restoreActionBar();
    }
    else{
        super.onBackPressed();
    }


}

导航抽屉突出显示

2 个答案: