Question

我在this tutorial之后为我的项目构建了导航抽屉，但是个人资料图片没有显示，我也找不到解决方案。在android清单中我添加了互联网权限。

主要活动：

import android.os.Bundle;
import android.os.Handler;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.NavigationView;
import android.support.design.widget.Snackbar;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
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;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;


import com.bumptech.glide.Glide;
import com.bumptech.glide.load.engine.DiskCacheStrategy;

public class MainActivity extends AppCompatActivity
    implements NavigationView.OnNavigationItemSelectedListener {
private NavigationView navigationView;
private DrawerLayout drawer;
private View navHeader;
private ImageView imgNavHeaderBg, imgProfile;
private TextView txtName, txtWebsite;
private Toolbar toolbar;
private FloatingActionButton fab;


private static final String urlNavHeaderBg = "http://api.androidhive.info/images/nav-menu-header-bg.jpg";
private static final String urlProfileImg = "http://dl.topnaz.com/2013/09/Newsha-Zeighami-2.jpg";


public static int navItemIndex = 0;


private static final String TAG_HOME = "home";
private static final String TAG_PHOTOS = "photos";
private static final String TAG_MOVIES = "movies";
public static String CURRENT_TAG = TAG_HOME;


private String[] activityTitles;


private boolean shouldLoadHomeFragOnBackPress = true;
private Handler mHandler;

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

    mHandler = new Handler();
    navigationView = (NavigationView) findViewById(R.id.nav_view);
    navHeader = navigationView.getHeaderView(0);
    txtName = (TextView) navHeader.findViewById(R.id.name);
    txtWebsite = (TextView) navHeader.findViewById(R.id.website);
    imgNavHeaderBg = (ImageView) navHeader.findViewById(R.id.img_header_bg);
    imgProfile = (ImageView) navHeader.findViewById(R.id.img_profile);
    activityTitles = getResources().getStringArray(R.array.nav_item_activity_titles);

    fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show();
        }
    });

     drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
            this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close){
    @Override
    public void onDrawerClosed(View drawerView) {
        super.onDrawerClosed(drawerView);
    }

    @Override
    public void onDrawerOpened(View drawerView) {
        super.onDrawerOpened(drawerView);
    }
};
    drawer.setDrawerListener(toggle);
    toggle.syncState();

    navigationView.setNavigationItemSelectedListener(this);

    loadNavHeader();

    if (savedInstanceState == null) {
        navItemIndex = 0;
        CURRENT_TAG = TAG_HOME;
        loadHomeFragment();
    }
}

private void loadNavHeader() {
    // name, website
    txtName.setText("Ravi Tamada");
    txtWebsite.setText("www.androidhive.info");

    Glide.with(this).load(urlNavHeaderBg)
            .crossFade()
            .diskCacheStrategy(DiskCacheStrategy.ALL)
            .into(imgNavHeaderBg);

    Glide.with(this).load(urlProfileImg)
            .crossFade()
            .thumbnail(0.5f)
            .bitmapTransform(new CircleTransform(this))
            .diskCacheStrategy(DiskCacheStrategy.ALL)
            .into(imgProfile);

    navigationView.getMenu().getItem(3).setActionView(R.layout.menu_dot);
}

@Override
public void onBackPressed() {
    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    if (drawer.isDrawerOpen(GravityCompat.START)) {
        drawer.closeDrawer(GravityCompat.START);
    }
    else {
        super.onBackPressed();
    }
    if (shouldLoadHomeFragOnBackPress) {
        // checking if user is on other navigation menu
        // rather than home
        if (navItemIndex != 0) {
            navItemIndex = 0;
            CURRENT_TAG = TAG_HOME;
            loadHomeFragment();
            return;
        }
    }
}

private void loadHomeFragment() {
    selectNavMenu();

    setToolbarTitle();

    if (getSupportFragmentManager().findFragmentByTag(CURRENT_TAG) != null) {
        drawer.closeDrawers();

        toggleFab();
        return;
    }
    Runnable mPendingRunnable = new Runnable() {
        @Override
        public void run() {
            Fragment fragment = getHomeFragment();
            FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
            fragmentTransaction.setCustomAnimations(android.R.anim.fade_in,
                    android.R.anim.fade_out);
            fragmentTransaction.replace(R.id.frame, fragment, CURRENT_TAG);
            fragmentTransaction.commitAllowingStateLoss();
        }
    };

    if (mPendingRunnable != null) {
        mHandler.post(mPendingRunnable);
    }
    toggleFab();

    //Closing drawer on item click
    drawer.closeDrawers();

    // refresh toolbar menu
    invalidateOptionsMenu();
}

private Fragment getHomeFragment() {
    switch (navItemIndex) {
        case 0:
            // home
            HomeFragment homeFragment = new HomeFragment();
            return homeFragment;
        case 1:
            // photos
            PhotosFragment photosFragment = new PhotosFragment();
            return photosFragment;
        case 2:
            // movies fragment
            MoviesFragment moviesFragment = new MoviesFragment();
            return moviesFragment;
        case 3:
            // notifications fragment
            NotificationsFragment notificationsFragment = new NotificationsFragment();
            return notificationsFragment;

        case 4:
            // settings fragment
            SettingsFragment settingsFragment = new SettingsFragment();
            return settingsFragment;
        default:
            return new HomeFragment();
    }
}

private void setToolbarTitle() {
    getSupportActionBar().setTitle(activityTitles[navItemIndex]);
}

private void selectNavMenu() {
    navigationView.getMenu().getItem(navItemIndex).setChecked(true);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    if (navItemIndex == 0) {
        getMenuInflater().inflate(R.menu.main, menu);
    }

    // when fragment is notifications, load the menu created for notifications
    if (navItemIndex == 3) {
        getMenuInflater().inflate(R.menu.notifications, 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;
    }

    if (id == R.id.action_mark_all_read) {
        Toast.makeText(getApplicationContext(), "All notifications marked as read!", Toast.LENGTH_LONG).show();
    }

    if (id == R.id.action_clear_notifications) {
        Toast.makeText(getApplicationContext(), "Clear all notifications!", Toast.LENGTH_LONG).show();
    }

    return super.onOptionsItemSelected(item);
}
private void toggleFab() {
    if (navItemIndex == 0)
        fab.show();
    else
        fab.hide();
}

@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
    // Handle navigation view item clicks here.
    int id = item.getItemId();

    if (id == R.id.nav_camera) {
        // Handle the camera action
        navItemIndex = 0;
        CURRENT_TAG = TAG_HOME;
    } else if (id == R.id.nav_gallery) {
        navItemIndex = 1;
        CURRENT_TAG = TAG_PHOTOS;

    } else if (id == R.id.nav_slideshow) {
        navItemIndex = 2;
        CURRENT_TAG = TAG_MOVIES;

    } else if (id == R.id.nav_manage) {

    } else if (id == R.id.nav_share) {

    } else if (id == R.id.nav_send) {

    }
    if (item.isChecked()) {
        item.setChecked(false);
    } else {
        item.setChecked(true);
    }
    item.setChecked(true);

    loadHomeFragment();

    return true;

}

}

activity_main.xml中：

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:openDrawer="start">

<include
    layout="@layout/app_bar_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

<android.support.design.widget.NavigationView
    android:id="@+id/nav_view"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:layout_gravity="start"
    android:fitsSystemWindows="true"
    app:headerLayout="@layout/nav_header_main"
    app:menu="@menu/activity_main_drawer" />

</android.support.v4.widget.DrawerLayout>

Answer 1

哟首先需要获取包含主要布局（您要设置值的位置）的navigationView的ID。添加一个视图，您将在其中投射NavigationView的第零个元素

NavigationView activity_dashboard = findViewById(R.id.nav_view);
View headerView = activity_dashboard.getHeaderView(0);

现在您可以在布局中获取任何值以下是代码

ImageView profileImageView = headerView.findViewById(R.id.img_header_bg);

无法在导航栏中显示配置文件图像

1 个答案: