Android導航滑動抽屜TabView

我偶然發現了一個瘋狂的小錯誤，或者我只是做錯了什麼。我試圖在主要活動中獲取滑動選項卡視圖，滑動tabView完美的工作，但主要問題是當點擊導航抽屜菜單，然後片段相互重疊。請幫助..Android導航滑動抽屜TabView

這裏是我的兩個片段TabView的

1.NewsFragment

public class NewsFragment extends Fragment { 

public static NewsFragment newInstance(){ 
    NewsFragment newsFragment=new NewsFragment(); 
    return newsFragment; 
} 
@Nullable 
@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
    return inflater.inflate(R.layout.news_fragment,null); 
}}

2.NoticeFragment

public class NoticeFragment extends Fragment { 
public static NoticeFragment newInstance(){ 
    NoticeFragment noticeFragment=new NoticeFragment(); 
    return noticeFragment; 
} 
@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
    return inflater.inflate(R.layout.notice_fragment, container, false); 
}}

這裏是我的兩個XML兩個片段

1.News_fragment.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:orientation="vertical"> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_marginTop="120dp" 
    android:textSize="30sp" 
    android:gravity="center" 
    android:id="@+id/textView" 
    android:layout_centerHorizontal="true" 
    android:textColor="@android:color/holo_blue_dark" 
    android:text="News\nFragment"/> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:autoLink="web" 
    android:textSize="15sp" 
    android:layout_marginTop="10dp" 
    android:layout_centerHorizontal="true" 
    android:text="Android Sikkha" 
    android:textColor="#000" 
    android:layout_below="@+id/textView" 
    android:textStyle="italic"/> 
</RelativeLayout>

2.notice_fragment.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:orientation="vertical"> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_marginTop="120dp" 
    android:textSize="30sp" 
    android:gravity="center" 
    android:id="@+id/textView" 
    android:layout_centerHorizontal="true" 
    android:textColor="@android:color/holo_blue_dark" 
    android:text="Notice\nFragment"/> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:autoLink="web" 
    android:textSize="15sp" 
    android:layout_marginTop="10dp" 
    android:layout_centerHorizontal="true" 
    android:text="Android Sikkha" 
    android:textColor="#000" 
    android:layout_below="@+id/textView" 
    android:textStyle="italic"/> 

</RelativeLayout>

我有叫家庭其他Java文件，該文件是一樣的前一個Java文件和XML也一樣。

這裏是在MainActivity

package com.example.user.navwithtab; 

import android.os.Bundle; 
import android.support.design.widget.FloatingActionButton; 
import android.support.design.widget.Snackbar; 
import android.support.design.widget.TabLayout; 
import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentManager; 
import android.support.v4.app.FragmentPagerAdapter; 
import android.support.v4.view.ViewPager; 
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; 

import java.util.ArrayList; 
import java.util.List; 

public class MainActivity extends AppCompatActivity 
    implements NavigationView.OnNavigationItemSelectedListener { 
DrawerLayout drawer; 
ViewPager mViewPager; 


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

    // Setear adaptador al viewpager. 
    mViewPager = (ViewPager) findViewById(R.id.pager); 
    setupViewPager(mViewPager); 

    // Preparar las pestañas 
    TabLayout tabs = (TabLayout) findViewById(R.id.tabs); 
    tabs.setupWithViewPager(mViewPager); 

    FloatingActionButton 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(); 
     } 
    }); 

    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); 
} 
private void setupViewPager(ViewPager viewPager) { 
    SectionsPagerAdapter adapter = new SectionsPagerAdapter(getSupportFragmentManager()); 
    adapter.addFragment(NewsFragment.newInstance(), "News"); 
    adapter.addFragment(NoticeFragment.newInstance(), "Notice"); 
    viewPager.setAdapter(adapter); 
} 
public class SectionsPagerAdapter extends FragmentPagerAdapter { 
    private final List<Fragment> mFragments = new ArrayList<>(); 
    private final List<String> mFragmentTitles = new ArrayList<>(); 

    public SectionsPagerAdapter(FragmentManager fm) { 
     super(fm); 
    } 

    @Override 
    public Fragment getItem(int position) { 
     return mFragments.get(position); 
    } 

    @Override 
    public int getCount() { 
     return mFragments.size(); 
    } 

    public void addFragment(Fragment fragment, String title) { 
     mFragments.add(fragment); 
     mFragmentTitles.add(title); 
    } 

    @Override 
    public CharSequence getPageTitle(int position) { 
     return mFragmentTitles.get(position); 
    } 
} 





@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); 
} 

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

    if (id == R.id.home) { 
     fragmentManager.beginTransaction().replace(R.id.content_frame,new HomeFragment()).commit(); 
    } else if (id == R.id.announcement) { 
     fragmentManager.beginTransaction().replace(R.id.content_frame,new AnnouncementFragment()).commit(); 

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

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

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

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

    } 

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

這裏是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>

對不起，長期職位。

注意：導航抽屜和滑動視圖工作完美，但問題是片段疊加。 after clicking navigationbarmenu

這裏是我的logcat

E/AndroidRuntime: FATAL EXCEPTION: main 
       Process: com.example.user.navwithtab, PID: 3400 
       java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.widget.DrawerLayout.closeDrawer(int)' on a null object reference 
        at com.example.user.navwithtab.MainActivity.onNavigationItemSelected(MainActivity.java:157) 
        at android.support.design.widget.NavigationView$1.onMenuItemSelected(NavigationView.java:153) 
        at android.support.v7.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:810) 
        at android.support.v7.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:152) 
        at android.support.v7.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:957) 
        at android.support.design.internal.NavigationMenuPresenter$1.onClick(NavigationMenuPresenter.java:328) 
        at android.view.View.performClick(View.java:5198) 
        at android.view.View$PerformClick.run(View.java:21147) 
        at android.os.Handler.handleCallback(Handler.java:739) 
        at android.os.Handler.dispatchMessage(Handler.java:95) 
        at android.os.Looper.loop(Looper.java:148) 
        at  android.app.ActivityThread.main(ActivityThread.java:5417) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

來源

2016-09-29 Shantu Das

我認爲它有在你的'onNavigationItemSelected'中用'fragmentManager.beginTransaction（）。replace（..）'做一些事情。你可以發佈「activity_main.xml」的內容嗎？ – rubenlop

不要創建新的'DrawerLayout' – adnbsr

@adnbsr他在做什麼呢？ – rubenlop

在onNavigationItemSelected方法不重新創建DrawerLayout。只需撥打closeDrawer即可。

DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); --> remove this line of code 
drawer.closeDrawer(GravityCompat.START);

UPDATE

在你onCreate方法改變這行代碼

DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);

到

drawer = (DrawerLayout) findViewById(R.id.drawer_layout);

，並添加這行代碼

DrawerLayout drawer

這行代碼下面

ViewPager mViewPager;

和刪除的代碼所指示的行中onNavigationItemSelected方法

來源

2016-09-29 23:37:48 7geeky

如果我刪除這一行，如何獲取抽屜對象，以便我可以調用closeDrawer（GravityCompat.START）函數。 –

你試過了嗎？它會工作，因爲你已經初始化它 – 7geeky

是的，我已經做到了，當我刪除這條線時，它顯示無法解析抽屜 –

if (id == R.id.home) { 
    fragmentManager.beginTransaction().replace(R.id.content_frame,new HomeFragment()).commit(); 
} else if (id == R.id.announcement) { 
    fragmentManager.beginTransaction().replace(R.id.content_frame,new AnnouncementFragment()).commit();

更新以上如下代碼：

if (id == R.id.home) { 
fragmentManager.beginTransaction().replace(R.id.content_frame,new HomeFragment()).addToBackStack(null).commit(); 
} else if (id == R.id.announcement) { 
fragmentManager.beginTransaction().replace(R.id.content_frame,new AnnouncementFragment()).addToBackStack(null).commit();

來源

2016-10-01 02:07:32

Android導航滑動抽屜TabView

回答

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