Question

我的NavigationView onClick事件无效。

以下是我逐个尝试的代码片段，但没有任何效果：

使用NavigationView.OnNavigationItemSelectedListener方法

OnClick()

设置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;
    }
});

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);
}

我也尝试过与我的问题相关的所有问题和博客，但它没有用。

Navigation Drawer: setNavigationItemSelectedListener is not working.
https://stackoverflow.com/questions/47242960/navigationview-setnavigationitemselectedlistener
onNavigationItemSelected not working in NavigationView

这是我的完整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非常关注布局XML。我把我的NavigationView作为DrawerLayout的第一个孩子，但由于某些愚蠢的原因，它必须是最后一个孩子。因此，您的布局必须按此顺序包含元素：

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

不按此顺序：

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

Answer 2

这对我很有用，可以将视图展现在最前面

navigationView.setNavigationItemSelectedListener(this);
navigationView.bringToFront();

Answer 3

如果您遇到更多问题并希望了解导航抽屉的内容，请创建一个新项目并选择导航抽屉布局或代码下方的Checkout：

使用以下代码：

import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;

public class MainActivity extends AppCompatActivity
        implements NavigationView.OnNavigationItemSelectedListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);



        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
                this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
        drawer.setDrawerListener(toggle);
        toggle.syncState();

        NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
        navigationView.setNavigationItemSelectedListener(this);

        //add this line to display menu1 when the activity is loaded
        displaySelectedScreen(R.id.nav_menu1);
    }

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

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    private void displaySelectedScreen(int itemId) {

        //creating fragment object
        Fragment fragment = null;

        //initializing the fragment object which is selected
        switch (itemId) {
            case R.id.nav_menu1:
                fragment = new Menu1();
                break;
            case R.id.nav_menu2:
                fragment = new Menu2();
                break;
            case R.id.nav_menu3:
                fragment = new Menu3();
                break;
        }

        //replacing the fragment
        if (fragment != null) {
            FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
            ft.replace(R.id.content_frame, fragment);
            ft.commit();
        }

        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        drawer.closeDrawer(GravityCompat.START);
    }


    @SuppressWarnings("StatementWithEmptyBody")
    @Override
    public boolean onNavigationItemSelected(MenuItem item) {

        //calling the method displayselectedscreen and passing the id of selected menu
        displaySelectedScreen(item.getItemId());
        //make this method blank
        return true;
    }


}

setNavigationItemSelectedListener不起作用

3 个答案: