Java 从另一个类以编程方式关闭导航抽屉

Close navigation drawer programmatically from another class

提问by nexodus

I currently am using Fragments in my app. In my MainActivity I have a navigation drawer which is then subsequently populated by a Fragment, as well as the main area in the activity which is populated by another Fragment.

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 填充的活动中的主要区域。

The clicking of an item in the navigation drawer is dealt with by my first fragment, only, the navigation drawer is in my MainActivity class. I can't seem to be able to close the navigation drawer (I can swipe it closed but I want it to auto close after an item has been clicked) from my fragment after an item has been clicked, is there any way to do this?

单击导航抽屉中的项目由我的第一个片段处理，只有导航抽屉在我的 MainActivity 类中。单击项目后，我似乎无法从我的片段中关闭导航抽屉（我可以将其滑动关闭，但我希望它在单击项目后自动关闭），有什么方法可以做到这一点?

Heres my code:

这是我的代码：

MainActivity:

主要活动：

    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(){

}

}

}

And my first fragment

还有我的第一个片段

          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;
        }
    });
            .......

I look forward to hearing your suggestions, thanks.

我期待听到您的建议，谢谢。

回答by RCB

Your DrawerLayout has a method called "closeDrawers()". I was having that problem and I used that in my "onChildClick" method. (My drawer had an ExpandableListView your might be a different callback like "onItemSelected" etc) It worked for me.

您的 DrawerLayout 有一个名为“closeDrawers()”的方法。我遇到了这个问题，我在“onChildClick”方法中使用了它。（我的抽屉有一个 ExpandableListView 你可能是一个不同的回调，比如“onItemSelected”等）它对我有用。

There's also closeDrawer(View view) and closeDrawer(int gravity). They might be helpful you too. So as long has you have a reference to the DrawerLayout you should be able to use one of these.

还有 closeDrawer(View view) 和 closeDrawer(int Gravity)。他们也可能对你有帮助。因此，只要您有对 DrawerLayout 的引用，您就应该能够使用其中之一。

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

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

回答by Alejandro Villarreal

On your MainActivity:

在您的 MainActivity 上：

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

On your fragment class:

在你的片段类上：

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

回答by KeyOne

if you used Fragment as NavigationView in the DrawerLayout, you must send a view of the fragment as an argument in closeDrawer/openDrawer method :

如果在 DrawerLayout 中使用 Fragment 作为 NavigationView，则必须在 closeDrawer/openDrawer 方法中将片段视图作为参数发送：

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

I hope it helps you.

我希望它能帮助你。