从另一个类中以编程方式关闭导航抽屉

Question

我目前在我的应用程序中使用Fragments。在我的MainActivity中，我有一个导航抽屉，然后由一个Fragment填充，以及由另一个Fragment填充的活动的主要区域。

导航抽屉中项目的点击只由我的第一个Fragment处理，而导航抽屉在我的MainActivity类中。在项目被点击后，我似乎无法关闭导航抽屉（我可以将其滑动关闭，但我希望它在项目被点击后自动关闭），有没有办法做到这一点？

以下是我的代码：

MainActivity:

    public class MainActivity extends Activity {

LinearLayout mainContent;
LinearLayout background;
SharedPreferences prefs;
DataBase db;
SQLiteDatabase mDB;
DrawerLayout mDrawerLayout;
ActionBarDrawerToggle mDrawerToggle;
TextView divider;
Typeface[] fonts = new Typeface[4];
Boolean isPortrait = true;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    prefs = PreferenceManager
            .getDefaultSharedPreferences(getApplicationContext());

    String theme = prefs.getString("PREF_THEME", "holoWhite");
    if (theme.equals("holoWhite")) {
        setTheme(R.style.AppBaseTheme);
    } else {
        setTheme(R.style.AppBaseThemeDark);
    }

    if(getResources().getConfiguration().orientation == getResources().getConfiguration().ORIENTATION_LANDSCAPE){
        isPortrait = false;
    }

    setContentView(R.layout.activity_main);

    initialiseVariables();

    setTheme();
    loadInitialContentFragment();

    SQLiteDatabase dataB = db.getWritableDatabase();
    dataB.execSQL("DELETE FROM " + "StackTable");
    dataB.close();

    loadFrag(new LeftFragment(), null, R.id.mainLeftView);

    fonts[0] = Typeface.createFromAsset(getAssets(), "Roboto-Light.ttf");
    fonts[1] = Typeface.createFromAsset(getAssets(),
            "Roboto-LightItalic.ttf");
    fonts[2] = Typeface.createFromAsset(getAssets(), "Roboto-Medium.ttf");
    fonts[3] = Typeface.createFromAsset(getAssets(),
            "Roboto-MediumItalic.ttf");

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    return true;
}

public void initialiseVariables() {
    db = new DataBase(this);
    background = (LinearLayout) findViewById(R.id.background);
    prefs = PreferenceManager
            .getDefaultSharedPreferences(getApplicationContext());
    mainContent = (LinearLayout) findViewById(R.id.mainContentView);
    if(!isPortrait){
        divider = (TextView)findViewById(R.id.mainLandDivider);
        divider.setBackgroundColor(new Colours().getARGBForBG(prefs.getString("PREF_COLOR", "blue"), prefs.getString("PREF_THEME", "holoWhite")));
    }
    if(isPortrait){
        mDrawerLayout = (DrawerLayout) findViewById(R.id.mainLeftDrawer);
        mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
                R.drawable.ic_drawer, R.string.drawer_open, R.string.drawer_close) {

            /** Called when a drawer has settled in a completely closed state. */
            public void onDrawerClosed(View view) {
                loadFrag(new LeftFragment(), null, R.id.mainLeftView);
            }

            /** Called when a drawer has settled in a completely open state. */
            public void onDrawerOpened(View drawerView){
            }
        };

        mDrawerLayout.setDrawerListener(mDrawerToggle);
    }
}

public void loadInitialContentFragment() {
    loadFrag(new ContentFragment(), "none", R.id.mainContentView);

    SQLiteDatabase mDB = db.getWritableDatabase();
    ContentValues vals = new ContentValues();
    vals.put("LEVEL", "none");
    mDB.insert("StackTable", null, vals);

}

public void loadFrag(Fragment _fragment, String _parent, int id){
    Bundle bundle = new Bundle();
    bundle.putString("PARENT", _parent);
    _fragment.setArguments(bundle);
    FragmentManager fragmentManager = getFragmentManager();
    FragmentTransaction fragmentTransaction = fragmentManager
            .beginTransaction();
    fragmentTransaction.replace(id, _fragment).commit();
}

public void setTheme() {
    if (prefs.getString("PREF_THEME", "holoWhite").equals("holoWhite")) {
        background.setBackgroundColor(Color.argb(255, 238, 238, 238));
    } else {
        background.setBackgroundColor(Color.argb(255, 20, 20, 20));
    }
}

@Override
public void onBackPressed() {
    String goTo = "";

    SharedPreferences prefs2 = getSharedPreferences(
            "uk.me.lewisdeane.jotterpro", Context.MODE_PRIVATE);

    SQLiteDatabase mDB = db.getReadableDatabase();
    Cursor C = mDB.query("NoteTable", new String[] { "PARENT", "NOTE",
            "TIME", "DATE", "REMINDER", "PASSWORD" }, "NOTE=?",
            new String[] { prefs2.getString(
                    "uk.me.lewisdeane.jotterpro.parent", null) }, null,
            null, null);

    if (C == null) {
        finish();
    } else if (!(C.moveToFirst()) || C.getCount() == 0) {
        finish();
    } else {
        C.moveToLast();
        do {
            goTo = C.getString(0);
        } while (C.moveToPrevious());
    }

    C.close();

    if (prefs2.getString("uk.me.lewisdeane.jotterpro.parent", null).equals(
            "none")) {
        finish();
    } else {
        loadFrag(new ContentFragment(), goTo, R.id.mainContentView);
    }
}

public void closeDrawer(){
    mDrawerLayout.closeDrawer(Gravity.LEFT);
}

public MainActivity(){

}

          public class LeftFragment extends Fragment {

/*
 * 
 * THIS CLASS HANDLES THE UPCOMING NOTES FRAGMENT
 */

// Key items to the class
View rootView;
DataBase db;
SQLiteDatabase mDB;

// ArrayLists of the components of each note
ArrayList<String> mTitles = new ArrayList<String>();
ArrayList<String> mTimes = new ArrayList<String>();
ArrayList<String> mDates = new ArrayList<String>();
ArrayList<String> mReminders = new ArrayList<String>();
ArrayList<String> mPasswords = new ArrayList<String>();
ArrayList<String> mSubItems = new ArrayList<String>();
ArrayList<String> mSelected = new ArrayList<String>();

// Hash maps will hold the preferences
HashMap<String, String> strPrefs = new HashMap<String, String>();
HashMap<String, Boolean> boolPrefs = new HashMap<String, Boolean>();

// ListView to be used
ListView mListView;

// Load prefs
SharedPreferences prefs;

// Adapter...
CardAdapter mAdapter;

// Fonts
Typeface[] fonts = new Typeface[4];

// Stuff to do with storing dates and stuff
ArrayList<Long> intDates = new ArrayList<Long>();
Map<Long, String> mMap = new HashMap<Long, String>();

// Used in detecting password notes
int count = 0;
Boolean proceed = true;

// Boolean storing devices orientation
Boolean isPortrait = true;

// Title and edittext
EditText mHeader;

// TextView below the header
TextView mDivider;

// Background of whole fragment
LinearLayout mBackground;

public LeftFragment() {

}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    rootView = inflater.inflate(R.layout.left_fragment, container, false);

    // Load all settings before doing anything
    loadPreferences();

    // Initialise the bulk of variables
    initialiseVariables();

    return rootView;
}

public void initialiseVariables() {
    // Define each item
    mListView = (ListView) rootView.findViewById(R.id.leftListView);
    mHeader = (EditText) rootView.findViewById(R.id.leftHeading);
    mDivider = (TextView) rootView.findViewById(R.id.leftDivider);
    mBackground = (LinearLayout) rootView.findViewById(R.id.leftBackground);

    // Set Adapter for listview
    mAdapter = new CardAdapter(getActivity(), R.layout.card_item, mTitles,
            mSubItems, mSelected, mTimes, mDates, mReminders, mPasswords);

    mListView.setAdapter(mAdapter);

    // Get Data
    getData();

    // Set up fonts
    fonts[0] = Typeface.createFromAsset(getActivity().getAssets(),
            "Roboto-Light.ttf");
    fonts[1] = Typeface.createFromAsset(getActivity().getAssets(),
            "Roboto-LightItalic.ttf");
    fonts[2] = Typeface.createFromAsset(getActivity().getAssets(),
            "Roboto-Medium.ttf");
    fonts[3] = Typeface.createFromAsset(getActivity().getAssets(),
            "Roboto-MediumItalic.ttf");

    // Apply settings to the header and listview
    if(strPrefs.get("PREF_THEME").equals("holoDark")){
        mHeader.setBackgroundColor(Color.BLACK);
        mHeader.setTextColor(new Colours().getARGBForBG(strPrefs.get("PREF_COLOR"), "PREF_THEME"));
        mHeader.setHintTextColor(Color.argb(255, 200, 200, 200));
        mDivider.setBackgroundColor(new Colours().getARGBForDivider(strPrefs.get("PREF_THEME")));
        mListView.setDivider(new ColorDrawable(new Colours().getARGBForDivider(strPrefs.get("PREF_THEME"))));
        mListView.setDividerHeight(10);
        mBackground.setBackgroundColor(new Colours().getARGBForDivider(strPrefs.get("PREF_THEME")));
    }

    // Set OnClickListeners and such...
    // Normal OnItemClick Listener...
    mListView.setOnItemClickListener(new OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                long arg3) {
            if (mSelected.size() == 0) {
                if (mPasswords.get(arg2).equals("")) {
                    loadFrag(new ContentFragment(), mTitles.get(arg2),
                            R.id.mainContentView);
                    MainActivity ma = new MainActivity();
                    ma.closeDrawer();
                } else {
                    openPassDialog(getPass(mTitles.get(arg2)),
                            mTitles.get(arg2));
                    new MainActivity().mDrawerLayout.closeDrawer(mListView);
                }
            } else {
                selectItem(arg0, arg1, arg2, arg3);
            }
        }
    });

    // OnItemLongClick Listener...
    mListView.setOnItemLongClickListener(new OnItemLongClickListener() {
        @Override
        public boolean onItemLongClick(AdapterView<?> arg0, View arg1,
                int arg2, long arg3) {
            selectItem(arg0, arg1, arg2, arg3);
            return true;
        }
    });
            .......

期待听到您的建议，谢谢。

- nexodus

---

你应该在Fragment中定义一个“回调”接口，并让Activity实现它，这样Fragment就可以调用Activity中的回调方法。请遵循Fragments的教程和文档。https://developer.android.com/guide/components/fragments.html#EventCallbacks - Squonk

还有，你说的“不能关闭它”是什么意思？请更具体地说明一下。你目前为止尝试过什么来解决这个问题吗？ - Aleksander Lidtke

我可以滑动关闭它，但当我从导航抽屉中选择一个项目时，它会在主区域加载该项目，然后我想关闭抽屉。 - nexodus

Answer 1

您的DrawerLayout有一个名为“closeDrawers（）”的方法。我也遇到了这个问题，并在我的“onChildClick”方法中使用了它。 （我的抽屉中有一个ExpandableListView，您可能需要不同的回调，如“onItemSelected”等）这对我有用。

还有closeDrawer（View view）和closeDrawer（int gravity）等方法，它们可能对您也有帮助。只要您有DrawerLayout的引用，就可以使用其中之一。

文档：https://developer.android.com/reference/android/support/v4/widget/DrawerLayout.html#closeDrawers()

- RCB

---

对我有用！这是该方法的文档：https://developer.android.com/reference/android/support/v4/widget/DrawerLayout.html#closeDrawers() - Franziskus Karsunke

Answer 2

在您的MainActivity中：

public void closeDrawer() {Drawer.closeDrawer(Gravity.LEFT);}

在你的碎片类中：

((MainActivity) getActivity()).closeDrawer();

- Alejandro Villarreal

Answer 3

如果你在DrawerLayout中使用Fragment作为NavigationView，那么你必须将fragment的视图作为参数发送到closeDrawer/openDrawer方法中：

mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED, mFragment.getView());
if (mDrawerLayout.isDrawerOpen(mFragment.getView())) {
      mDrawerLayout.closeDrawer(mFragment.getView());
} else {
       mDrawerLayout.openDrawer(mFragment.getView());
}

我希望它能帮到你。

- KeyOne