java - Android上的抽屉导航滞后

Question

我遇到了 Navigation Drawer 的问题，它太慢了，我正在寻找的解决方案是先关闭抽屉然后显示 Activity ，但是它不起作用，当然我错过了一些东西。

private class DrawerItemClickListener implements ListView.OnItemClickListener {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int posicao, long id) {
            setLastPosition(posicao);
            setFragmentList(lastPosition);
            layoutDrawer.closeDrawer(linearDrawer);
        }
    }

    private OnClickListener userOnClick = new OnClickListener() {
        @Override
        public void onClick(View v) {
            layoutDrawer.closeDrawer(linearDrawer);
        }
    };

    private void setFragmentList(int posicao) {

        FragmentManager fragmentManager = getSupportFragmentManager();
        Fragment fragment = new FragmentViagens();

        switch (posicao) {

            case 0:
                fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit();
                break;
            case 1:
                fragmentManager.beginTransaction().replace(R.id.content_frame, new FragmentPedidos()).commit();
                break;
            case 2:
                fragmentManager.beginTransaction().replace(R.id.content_frame, new FragmentClientes()).commit();
                break;

        }

        navigationAdapter.setChecked(posicao, true);
        setTitleFragments(lastPosition);
        navigationAdapter.resetarCheck();
        layoutDrawer.closeDrawer(linearDrawer);

    }

Answer 1

你可以这样做以避免抽屉滞后，改变你的onItemClick:

layoutDrawer.closeDrawer(linearDrawer);
setLastPosition(posicao);
new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {
            setFragmentList(lastPosition);
        }
    }, 200);

编辑: 首选的方式应该是在 DrawerLayout 上设置 DrawerListener 并在 onDrawerClosed 中设置您的 fragment 像这样:

Fragment mFragmentToSet = null;

@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
    // Handle navigation view item clicks here.
    switch (item.getItemId()) {
        case R.id.nav_home:
            mFragmentToSet = HomeFragment.newInstance(); 
            break;
    }

    mDrawerLayout.closeDrawer(GravityCompat.START);
    return true;
}

---

mDrawerLayout.addDrawerListener(new DrawerLayout.DrawerListener() {
        @Override public void onDrawerSlide(View drawerView, float slideOffset) {}
        @Override public void onDrawerOpened(View drawerView) {}
        @Override public void onDrawerStateChanged(int newState) {}

        @Override
        public void onDrawerClosed(View drawerView) {
          //Set your new fragment here
          if (mFragmentToSet != null) {
            getSupportFragmentManager()
                  .beginTransaction()
                  .replace(FRAGMENT_CONTAINER_ID, mFragmentToSet)
                  .commit();
            mFragmentToSet = null;
          }
        }
    });