我正在使用最近提供的Google支持库将导航抽屉添加到我的应用中.在导航抽屉的标题中,我定义了一个Circle ImageView来设置用户的个人资料照片,下面是他的名字.

所有这些信息首先由用户在应用程序的第一次启动时定义,因此当mainActivity启动时,图像和名称将加载到标头中.但我正在给用户提供在应用程序内修改这些内容的机会.如果用户转到配置文件frag,并选择新图像作为配置文件图片,或者如果他更改了名称,则此参数将不会在导航抽屉的标题中更新,直到应用程序关闭并再次加载.

这就是我在mainActivity中定义的方式：

public class MainActivity extends AppCompatActivity implements DrawerLayout.DrawerListener {

private NavigationView navView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        ....

        navView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
            @Override public boolean onNavigationItemSelected(MenuItem menuItem) {
                menuItem.setChecked(true);
                displayFragment(menuItem.getItemId());
                drawerLayout.closeDrawers();
                return true;
            }
        });
    }

没有必要实现DrawerLayout.DrawerListener,但是如上图所示,我已经完成了尝试实时更新标头.这些实现了下一个方法：

@Override
public void onDrawerSlide(View drawerView,float slideOffset) {
}
@Override
public void onDrawerOpened(View drawerView) {
        try {
            Contextwrapper cw = new Contextwrapper(getApplicationContext());
            File directory = cw.getDir("profile",Context.MODE_PRIVATE);
            File mypath = new File(directory,"thumbnail.png");
            Bitmap bitmap = BitmapFactory.decodeStream(new FileInputStream(mypath));
            thumbview.setimageBitmap(bitmap);
            username = mPreferences.getString("NAME",null);
            nameview.setText(username);
        } catch (FileNotFoundException e) {
            Log.e("LOAD_IMAGE",e.getMessage(),e);
            thumbview.setimageResource(R.drawable.default_thumbnail);
        }
}
@Override
public void onDrawerClosed(View drawerView) {
}
@Override
public void onDrawerStateChanged(int newState) {
}

在onDrawerOpened()方法中,我使用了与onCreate中使用的相同的代码来加载配置文件pic和名称.这应该在每次打开抽屉时更新这些参数,但是没有这样做,在我关闭并重新打开应用程序之前仍然不更新标题.

在onCreate中,我需要定义下一个代码,以便能够实时更新导航抽屉的标题：

public class MainActivity extends AppCompatActivity implements DrawerLayout.DrawerListener {

    private DrawerLayout drawerLayout;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        drawerLayout.setDrawerListener(this);
        ...

我刚刚使用MVP开始了一个新项目.似乎缺乏关于此方法的结构化信息,尤其是如何将其应用于导航抽屉的示例或细节.

是否有任何人都知道的首选方法或任何示例？

使用像这样的东西 example

我有一个导航抽屉,我想添加图标.但我不知道如何实现它.有什么办法可以自定义导航抽屉里面的列表吗？并使用菜单而不是数组导航抽屉内的项目.提前致谢 ：)

继承我的代码：

public class MainActivity extends ActionBaractivity {

private ListView mDrawerList;
private DrawerLayout mDrawerLayout;
private ArrayAdapter<String> mAdapter;
private ActionBarDrawerToggle mDrawerToggle;
private String mActivityTitle;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mDrawerList = (ListView)findViewById(R.id.navList);
    mDrawerLayout = (DrawerLayout)findViewById(R.id.drawer_layout);
    mActivityTitle = getTitle().toString();

    addDrawerItems();
    setupDrawer();
    FragmentManager fragmentManager = getSupportFragmentManager();
    fragmentManager.beginTransaction().replace(R.id.flContent,new One()).commit();
    getSupportActionBar().setdisplayHomeAsUpEnabled(true);
    getSupportActionBar().setHomeButtonEnabled(true);
     }

    private void addDrawerItems() {
    String[] osArray = { "Android","iOS","Windows","OS X","Linux" };
    mAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,osArray);
    mDrawerList.setAdapter(mAdapter);

    mDrawerList.setonItemClickListener(new AdapterView.OnItemClickListener() {
        Fragment fragment = null;

        Class fragmentClass;
        @Override
        public void onItemClick(AdapterView<?> parent,View view,int position,long id) {
            switch (position) {
                case 1:
                    fragmentClass = One.class;
                    break;
                case 2:
                    fragmentClass = Two.class;
                    break;
                default:
                    break;
            }
            try {
                fragment = (Fragment) fragmentClass.newInstance();
            } catch (Exception e) {
                e.printstacktrace();
            }

            // Insert the fragment by replacing any existing fragment

            FragmentManager fragmentManager=getSupportFragmentManager();
            fragmentManager.beginTransaction().replace(R.id.flContent,fragment).commit();
            // Highlight the selected item,update the title,and close the drawer
           mDrawerLayout.closeDrawers();
        }
    });


         }

      private void setupDrawer() {
      mDrawerToggle = new ActionBarDrawerToggle(this,mDrawerLayout,R.string.drawer_open,R.string.drawer_close) {

        /** Called when a drawer has settled in a completely open state. */
        public void onDrawerOpened(View drawerView) {
            super.onDrawerOpened(drawerView);
            getSupportActionBar().setTitle("Navigation!");
            invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
        }

        /** Called when a drawer has settled in a completely closed state. */
        public void onDrawerClosed(View view) {
            super.onDrawerClosed(view);
            getSupportActionBar().setTitle(mActivityTitle);
            invalidateOptionsMenu(); 
     // creates call to onPrepareOptionsMenu()
        }
    };

    mDrawerToggle.setDrawerIndicatorEnabled(true);
    mDrawerLayout.setDrawerListener(mDrawerToggle);
}

@Override
protected void onPostCreate(Bundle savedInstanceState) {
    super.onPostCreate(savedInstanceState);
    // Sync the toggle state after onRestoreInstanceState has occurred.
    mDrawerToggle.syncState();
}

@Override
public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
    mDrawerToggle.onConfigurationChanged(newConfig);
  }

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

    // Activate the navigation drawer toggle
    if (mDrawerToggle.onoptionsItemSelected(item)) {
        return true;
    }

    return super.onoptionsItemSelected(item);
}
 }

在你的导航抽屉xml文件里面添加菜单文件app：menu =“@ menu / activity_main_drawer”

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

在activity_main_drawer菜单文件中,用他们的名字定义你的图标

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <group android:checkableBehavior="single">
        <item android:id="@+id/nav_camara" android:icon="@android:drawable/ic_menu_camera"
            android:title="Camera" />
        <item android:id="@+id/nav_gallery" android:icon="@android:drawable/ic_menu_gallery"
            android:title="gallery" />
        <item android:id="@+id/nav_manage" android:icon="@android:drawable/ic_menu_manage"
            android:title="Manage" />
    </group>

在MainActivity.java中调用每个项目的操作单击抽屉菜单

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

        if (id == R.id.nav_camara) {
                      // Call your Action
        } else if (id == R.id.nav_gallery) {
                      // Call your Action
        } else if (id == R.id.nav_manage) {
                       // Call your Action
           }
                }