Question

我在导航抽屉中使用this示例。点击左侧抽屉列表视图的项目时，它会显示一些图像，但抽屉布局关闭不顺畅。

点击列表视图项后，我应该怎样做才能平滑地关闭左侧抽屉布局。

Answer 1

不确定这是最好的路线，但我解决这个问题的方法是创建一个在onDrawerClosed中运行的待处理Runnable。例如：

private void selectItem(final int position) {
    mPendingRunnable = new Runnable() {
        @Override
        public void run() {
            // update the main content by replacing fragments
            Fragment fragment = new PlanetFragment();
            Bundle args = new Bundle();
            args.putInt(PlanetFragment.ARG_PLANET_NUMBER, position);
            fragment.setArguments(args); 

            FragmentManager fragmentManager = getFragmentManager();
            fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit();
        }
    });

    // update selected item and title, then close the drawer
    mDrawerList.setItemChecked(position, true);
    setTitle(mPlanetTitles[position]);
    mDrawerLayout.closeDrawer(mDrawerList);
}

@Override
public void onDrawerClosed(View view) {
    getActionBar().setTitle(mTitle);
    invalidateOptionsMenu();

    // If mPendingRunnable is not null, then add to the message queue 
    if (mPendingRunnable != null) {
        mHandler.post(mPendingRunnable);
        mPendingRunnable = null;
    }
}

Answer 2

完美无缺

private class DrawerItemClickListener implements ListView.OnItemClickListener {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, final int position, long id) {
            mDrawerLayout.closeDrawer(mDrawerList);
            mDrawerLayout.postDelayed(new Runnable() {
                @Override
                public void run() {
                    selectItem(position);
                }
            }, 300);
        }
    }

Answer 3

只需使用处理程序在消息队列上发布drawerLayout.closeDrawer（），最小延迟解决了我的问题。 Handler.postDelayed（）是这里的关键。

 public void selectItem(int position)
    {
        switch (position)
        {
            case 0:

                DashboardFragment dashboardFragment = new DashboardFragment();
                Bundle args = new Bundle();
                args.putInt(dashboardFragment.ARG_SCREEN_NUMBER, position);
                dashboardFragment.setArguments(args);

                FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();

                // Replace whatever is in the fragment_container view with this fragment,
                // and add the transaction to the back stack so the user can navigate back
                transaction.replace(R.id.fragmentLayout, dashboardFragment, TAG_DASHBOARD);
                transaction.addToBackStack(null);

                // Commit the transaction
                transaction.commit();
                getSupportFragmentManager().executePendingTransactions();
                break;            

            default:
                break;

        }

        // Highlight the selected item, update the title, and close the drawer
        drawerList.setItemChecked(position, true);
        setTitle(mScreenTitles[position]);

        mPendingRunnable = new Runnable()
        {
            @Override
            public void run()
            {
                drawerLayout.closeDrawer(GravityCompat.START);
            }
        };
        mHandler.postDelayed(mPendingRunnable,50);

    }

Answer 4

我不使用线程，因为我需要在关闭导航菜单后更新UI。

以下代码适用于我。

我使用fragment作为类的成员变量来更新ui

setFragment（）函数用于将片段分配给片段变量

在onDrawerClosed（）事件中，我更新了ui。

mDrawerList.setOnItemClickListener(new ListView.OnItemClickListener()
{
   @Override
   public void onItemClick(AdapterView<?> parent, View view, int position, long id)
   {
       setFragment(position);
   }
});


// for getting fragment
protected void setFragment(int p)
{
    fragment = null;

    switch (position)
    {
        case 1:
            fragment = new DashboardFragment();                
            break;
    }

    if (fragment != null)
    {
        mDrawerList.setItemChecked(position, true);
        mDrawerList.setSelection(p);
        mDrawerLayout.closeDrawer(mDrawerList);
    }
}


// on close draw , fragment is loaded on screen
public void onDrawerClosed(View view)
{
   getSupportActionBar().setTitle(mTitle);
   invalidateOptionsMenu();

   FragmentManager fragmentManager = getSupportFragmentManager();

   fragmentManager.beginTransaction().replace(R.id.frame_container, fragment).commit();
}

Answer 5

请查看我的MainActivity，以使用自定义的topBar布局使DrawerLayout平滑（打开/关闭）。

public class MainActivity extends BaseActivity
    implements NavigationView.OnNavigationItemSelectedListener {

Fragment fragment = null;
Class fragmentClass = null;
FrameLayout frameLayout;
TextView topTilte;
DrawerLayout drawer;
NavigationView navigationView;
private boolean isDrawerOpen = false;

@Override
protected void onCreateFinished() {
    setContentView(R.layout.activity_main);

    drawer = findViewById(R.id.drawer_layout);
    navigationView = findViewById(R.id.nav_view);

    topTilte = findViewById(R.id.toolbar_title);
    fragmentClass = HomeFragment.class;
    topTilte.setText(R.string.menu_home);
    setFragment();

    drawer.addDrawerListener(new DrawerLayout.DrawerListener() {
        @Override
        public void onDrawerSlide(@NonNull View view, float slideOffset) {
            if(slideOffset > .55 && !isDrawerOpen){
                onDrawerOpened(view);
                isDrawerOpen = true;
            } else if(slideOffset < .45 && isDrawerOpen) {
                onDrawerClosed(view);
                isDrawerOpen = false;
            }
        }

        @Override
        public void onDrawerOpened(@NonNull View view) {

        }

        @Override
        public void onDrawerClosed(@NonNull View view) {

        }

        @Override
        public void onDrawerStateChanged(int i) {

        }
    });

    navigationView.setNavigationItemSelectedListener(this);
}

@Override
protected void afterInjection() {

}

public void openMenu(View v) {
    drawer.openDrawer(Gravity.LEFT);
}

@Override
public void onBackPressed() {
    DrawerLayout drawer = findViewById(R.id.drawer_layout);
    if (drawer.isDrawerOpen(GravityCompat.START)) {
        drawer.closeDrawer(GravityCompat.START);
    } else {
        super.onBackPressed();
    }
}

@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
    // Handle navigation view item clicks here.
    int id = item.getItemId();
    if (id == R.id.nav_home) {
        topTilte.setText(R.string.menu_home);
        fragmentClass = HomeFragment.class;
        setFragment();

    } else if (id == R.id.nav_profile) {

    } 

    return true;
}

private void setFragment() {


    final Handler handler = new Handler();
    handler.postDelayed(new Runnable() {
        @Override
        public void run() {
            try {
                fragment = (Fragment) fragmentClass.newInstance();
            } catch (Exception e) {
                e.printStackTrace();
            }

            FragmentManager fragmentManager = getSupportFragmentManager();
            fragmentManager.beginTransaction().replace(R.id.container, fragment).commit();

            drawer.closeDrawer(GravityCompat.START);
        }
    }, 200);
}
}

如何创建流畅的导航抽屉

5 个答案: