导航抽屉高亮

Question

我有一个导航抽屉，我使用选择器获取列表中的高级别项。

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

问题是，我重写了反向按钮，将片段更改为我的主要元素，如下所示：

@Override
public void onBackPressed()
{

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

现在，当我按下它改变了片段，但是突出显示的项目停留在我最后一次点击time.How的地方，我能实现也改变突出显示位置吗？使用一些类似于更改文本状态的代码，但是我用适配器创建导航抽屉元素.(我使用Android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号){ switch (number) { case 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

我找到了！必须将selectItem()更改为public，然后在onBackPressed中这样调用它！

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

        mNavigationDrawerFragment.selectItem(0);

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


}

Answer 2

编辑：

您可以在活动中访问NavigationDrawerFragment，只需将NavigationDrawerFragment的selectItem(int position)方法公开，如下所示：

...
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);
    }
}
...

然后在您的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);
}