setNavigationItemSelectedListener不起作用

Question

我的NavigationView onClick活动无法正常进行。

以下是我一一尝试过的代码段，但无济于事：

1. NavigationView.OnNavigationItemSelectedListener使用OnClick()方法实施
2. 设定NavigationItemSelectedListener方法

        nav  = (NavigationView)findViewById(R.id.nav);
    nav.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
        @Override
        public boolean onNavigationItemSelected(MenuItem item) {
            Toast.makeText(getApplicationContext(),"Hello",Toast.LENGTH_SHORT).show();
            return true;
        }
    });

1. 使用OnOptionItemSelected()方法

        @Override
    public boolean onOptionsItemSelected(MenuItem item) {
    if(toggle.onOptionsItemSelected(item))
    {
        return true;
    }
    switch (item.getItemId()) {
        case R.id.lib:

            Toast.makeText(getApplicationContext(),"OK",Toast.LENGTH_SHORT).show();
            return true;

        case R.id.fav:
            Toast.makeText(getApplicationContext(),"OK",Toast.LENGTH_SHORT).show();

            return true;
    }
    return super.onOptionsItemSelected(item);
    }

这是我完整的MainActivity.java文件：

    public class MainActivity extends AppCompatActivity{

    public frag_song song;
    public frag_artist artist;
    public  frag_album album;
    public TabLayout tab;
    Uri songUri;
    Cursor songCursor;
    public static LinearLayout mainLayout;
    int songTitle,songArtist,duration,data,songAlbum;
    public NavigationView nav;
    public DrawerLayout layout;
    public ActionBarDrawerToggle toggle;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ActionBar actionBar = getSupportActionBar();
        actionBar.setDisplayOptions(ActionBar.DISPLAY_SHOW_HOME);
        //actionBar.setIcon(R.drawable.logo);
        mainLayout = (LinearLayout)findViewById(R.id.main);

        //All Stuff Of NAvigatin Drawer
        layout = (DrawerLayout)findViewById(R.id.drawerL);
        toggle = new ActionBarDrawerToggle(MainActivity.this,layout,R.string.open,R.string.close);
        layout.addDrawerListener(toggle);
        toggle.syncState();
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        nav  = (NavigationView)findViewById(R.id.nav);
        nav.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(MenuItem item) {
                Toast.makeText(getApplicationContext(),"Hello",Toast.LENGTH_SHORT).show();
                return true;
            }
        });//Not Working
        nav.setItemIconTintList(null);

        //check if app open first time or not
        SharedPreferences prefs = this.getSharedPreferences("com.blackhat.rhythmbox", Context.MODE_PRIVATE);
        Boolean first = prefs.getBoolean("first", true);
        if(first){
            //Adding song To  Database
            addtoDatabase();
            prefs.edit().putBoolean("first",false).commit();
        }

        //Decaring Object of Fragment
        //TO access Tab
        tab = (TabLayout)findViewById(R.id.tabs);
        song = new frag_song();
        artist = new frag_artist();
        album = new frag_album();


        //addding tab to tab layout
        tab.addTab(tab.newTab().setText("Songs"),true);
        tab.addTab(tab.newTab().setText("ALbum"));
        tab.addTab(tab.newTab().setText("Artist"));

        tab.getTabAt(0).setIcon(R.drawable.icons_song);
        tab.getTabAt(1).setIcon(R.drawable.icons_album);
        tab.getTabAt(2).setIcon(R.drawable.icon_artist);
        //setting default tab
            FragmentManager fm = getSupportFragmentManager();
            fm.beginTransaction().replace(R.id.frame_container,song).commit();

            //on tab select
            tab.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
                @Override
                public void onTabSelected(TabLayout.Tab tab) {
                    switch (tab.getPosition())
                    {
                        case 0 :
                            FragmentManager f_song = getSupportFragmentManager();
                            f_song.beginTransaction().replace(R.id.frame_container,song).commit();
                            break;

                        case 1 :
                            FragmentManager f_artist = getSupportFragmentManager();
                            f_artist.beginTransaction().replace(R.id.frame_container,album).commit();
                            break;

                        case 2 :
                            FragmentManager f_album = getSupportFragmentManager();
                            f_album.beginTransaction().replace(R.id.frame_container,artist).commit();
                            break;
                    }

                }

                @Override
                public void onTabUnselected(TabLayout.Tab tab) {

                }

                @Override
                public void onTabReselected(TabLayout.Tab tab) {

                }
            });
        }

    @Override
    protected void onStop() {
        super.onStop();
    }

    public void addtoDatabase(){
        song_db dbHelper = new song_db(getApplicationContext());
        SQLiteDatabase db = dbHelper.getWritableDatabase();
        ContentValues contentValues = new ContentValues();

        ContentResolver contentResolver = getContentResolver();
        songUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
        songCursor = contentResolver.query(songUri, null, null, null, null);
        //checking if cursor is null or not

        if(songCursor !=null && songCursor.moveToFirst()){
            songTitle = songCursor.getColumnIndex(MediaStore.Audio.Media.TITLE);
            songArtist = songCursor.getColumnIndex(MediaStore.Audio.Media.ARTIST);
            duration = songCursor.getColumnIndex(MediaStore.Audio.Media.DURATION);
            songAlbum = songCursor.getColumnIndex(MediaStore.Audio.Media.ALBUM);
            data = songCursor.getColumnIndex(MediaStore.Audio.Media.DATA);
            Toast.makeText(getApplicationContext(),"Loaded",Toast.LENGTH_SHORT).show();
            do{
                contentValues.put("name",songCursor.getString(songTitle));
                contentValues.put("artist",songCursor.getString(songArtist));
                contentValues.put("album",songCursor.getString(songAlbum));
                contentValues.put("path",songCursor.getString(data));
                contentValues.put("duration",songCursor.getString(duration));
                contentValues.put("isfavorite",0);
                contentValues.put("playlist","regular");
                // contentValues.put("name",songCursor.getString(songArtist));
                db.insert("songs",null,contentValues);
            }while (songCursor.moveToNext());
        }

    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if(toggle.onOptionsItemSelected(item))
        {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }


}

Answer 1

我遇到了同样的问题，我发现Android非常注重布局XML。我将NavigationView作为DrawerLayout的第一个孩子，但是出于某些愚蠢的原因，它必须是最后一个孩子。因此，您的布局必须具有以下顺序的元素：

    <DrawerLayout>
        <FrameLayout/>
        <NavigationView/>
    </DrawerLayout>

不按此顺序：

    <DrawerLayout>
        <NavigationView/>
        <FrameLayout/>
    </DrawerLayout>