在 Android Studio 的默认导航抽屉模板中使用按钮在片段之间切换
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【中文标题】在 Android Studio 的默认导航抽屉模板中使用按钮在片段之间切换【英文标题】：Switching between fragments with a button in default Navigation Drawer template of Android Studio 【发布时间】：2018-03-06 14:40:22 【问题描述】：我在 android Studio 中使用默认的导航抽屉，并为导航抽屉中的前两个按钮添加了两个片段。一切正常，我可以从抽屉菜单中切换这些片段。
但我想在第一个片段中有一个简单的按钮，点击它会将我带到第二个片段。单击此类按钮会打开第二个片段，但它似乎与整个屏幕重叠并消失了导航视图。
这些是我项目的代码：
MainActivity.java ：
package com.example.arantik.test4;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v4.app.Fragment;
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);
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);
@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();
Fragment fragment=null;
if (id == R.id.nav_camera)
fragment=new Fragment_1();
else if (id == R.id.nav_gallery)
fragment=new Fragment_2();
android.support.v4.app.FragmentTransaction transaction=getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.mainFrame, fragment);
transaction.addToBackStack(null);
transaction.commit();
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
activity_main.xml：
<?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_
android:layout_
android:fitsSystemWindows="true"
tools:openDrawer="start">
<include
layout="@layout/app_bar_main"
android:layout_
android:layout_ />
<android.support.design.widget.NavigationView
android:id="@+id/nav_view"
android:layout_
android:layout_
android:layout_gravity="start"
android:fitsSystemWindows="true"
app:headerLayout="@layout/nav_header_main"
app:menu="@menu/activity_main_drawer" />
</android.support.v4.widget.DrawerLayout>
content_main.xml：
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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:layout_
android:layout_
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.example.arantik.test4.MainActivity"
tools:showIn="@layout/app_bar_main">
<FrameLayout
android:layout_
android:layout_
android:id="@+id/mainFrame">
</FrameLayout>
</android.support.constraint.ConstraintLayout>
Fragment_1.java：
package com.example.arantik.test4;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
public class Fragment_1 extends Fragment
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
View view=inflater.inflate(R.layout.fragment_1_layout, container, false);
Button button=(Button)view.findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
android.support.v4.app.FragmentManager fragmentManager = getFragmentManager();
android.support.v4.app.FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
Fragment_2 fragment_2=new Fragment_2();
fragmentTransaction.replace(android.R.id.content, fragment_2);
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
);
return view;
fragmen_1_layout.xml：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_
android:layout_>
<TextView
android:layout_
android:layout_
android:id="@+id/textView"
android:text="First Fragment"
android:textSize="20sp"/>
<Button
android:layout_
android:layout_
android:id="@+id/button"
android:text="click"/>
</LinearLayout>
Fragment_2.java：
package com.example.arantik.test4;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class Fragment_2 extends Fragment
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
View view=inflater.inflate(R.layout.fragment_2_layout, container, false);
return view;
fragmen_2_layout.xml：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_
android:layout_
android:background="#00ff00">
<TextView
android:layout_
android:layout_
android:id="@+id/textView"
android:text="Second Fragment"
android:textSize="20sp"/>
</LinearLayout>
我没有更改其他 Java 或 XML 代码。
【问题讨论】：
【参考方案1】：给MainActivity添加一个公共方法，在你的fragment中将getActivity()转换为MainActivity，然后你就可以调用该方法了。也可以使用interface，参考Communicating with Other Fragments
【讨论】：
你能解释一下关于选角的更多信息吗？我是安卓新手。 对不起，我认为现在在片段中获取 FragmentManager 不是一个好主意。以下可能是更好的方法。 gist以上是关于在 Android Studio 的默认导航抽屉模板中使用按钮在片段之间切换的主要内容，如果未能解决你的问题，请参考以下文章
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