我创建了一个导航抽屉，当我点击关于的项目时，它会在nav_bar中显示关于但不显示关于它的xml页面。它以xml布局显示主页。 当我点击“关于”时，它会显示我的主页
After clicking About, it again shows my default layout
我的主要活动
public class MainActivity extends AppCompatActivity {
public DrawerLayout mDrawer;
public Toolbar toolbar;
public NavigationView nvDrawer;
private ActionBarDrawerToggle drawerToggle;
// Button Activity
public Button btn;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn = (Button) findViewById(R.id.btn);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent in = new Intent(MainActivity.this,FiveFragment.class);
startActivity(in);
}
});
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
mDrawer = (DrawerLayout) findViewById(R.id.drawer_layout);
nvDrawer = (NavigationView) findViewById(R.id.nvView);
setupDrawerContent(nvDrawer);
drawerToggle = setupDrawerToggle();
mDrawer.addDrawerListener(drawerToggle);
}
private ActionBarDrawerToggle setupDrawerToggle() {
// NOTE: Make sure you pass in a valid toolbar reference. ActionBarDrawToggle() does not require it
// and will not render the hamburger icon without it.
return new ActionBarDrawerToggle(this, mDrawer, toolbar, R.string.drawer_open, R.string.drawer_close);
}
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
drawerToggle.syncState();
}
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Pass any configuration change to the drawer toggles
drawerToggle.onConfigurationChanged(newConfig);
}
private void setupDrawerContent(NavigationView navigationView) {
navigationView.setNavigationItemSelectedListener(
new NavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
selectDrawerItem(menuItem);
return true;
}
});
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// The action bar home/up action should open or close the drawer.
switch (item.getItemId()) {
case android.R.id.home:
mDrawer.openDrawer(GravityCompat.START);
return true;
}
return super.onOptionsItemSelected(item);
}
public void selectDrawerItem(MenuItem menuItem) {
// Create a new fragment and specify the fragment to show based on nav item clicked
android.support.v4.app.Fragment fragment = null;
Class fragmentClass = null;
switch (menuItem.getItemId()) {
case nav_first_fragment: // Home
fragmentClass = OneFragment.class;
break;
case nav_second_fragment: // Depertment
fragmentClass = TwoFragment.class;
break;
case nav_third_fragment: // Resources
fragmentClass = ThreeFragment.class;
break;
case nav_four_fragment: //Contact us
fragmentClass = FourFragment.class;
break;
case nav_five_fragment: // About
fragmentClass = FiveFragment.class;
break;
case nav_six_fragment: // Update
fragmentClass = SixFragment.class;
break;
case nav_seven_fragment: // Share
fragmentClass = SevenFragment.class;
break;
//default:
// fragmentClass = OneFragment.class; //Home
}
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 has been done by NavigationView
menuItem.setChecked(true);
// Set action bar title
setTitle(menuItem.getTitle());
// Close the navigation drawer
mDrawer.closeDrawers();
} }
我的主要xml页面
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!-- This LinearLayout represents the contents of the screen -->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<!-- The ActionBar displayed at the top -->
<include
layout="@layout/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<!-- The main content view where fragments are loaded -->
<FrameLayout
android:id="@+id/flContent"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="5dp"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<TextView
android:id="@+id/textView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="52dp"
android:text="@string/About" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/btn"
android:text="@string/ContactUs"
android:background="@color/colorPrimary"
android:clickable="true"
android:padding="3dp"/>
</FrameLayout>
</LinearLayout>
<!-- The navigation drawer that comes from the left -->
<!-- Note that `android:layout_gravity` needs to be set to 'start' -->
<android.support.design.widget.NavigationView
android:id="@+id/nvView"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:background="@android:color/white"
app:menu="@menu/drawer_view"
app:itemIconTint="@color/drawer_item"
app:itemTextColor="@color/drawer_item"
app:itemBackground="@drawable/drawer_item_bg"
app:headerLayout="@layout/nav_header">
</android.support.design.widget.NavigationView>
我的关于xml页面
<FrameLayout
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:tools="http://schemas.android.com/tools"
android:layout_marginTop="20dp"
android:background="@android:color/holo_red_light"
android:padding="5dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
tools:ignore="UselessParent">
<TextView
android:text="@string/About"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/about"
android:layout_marginTop="15dip"
android:gravity="center"
android:textColor="@android:color/holo_blue_bright"
/>
<RelativeLayout
android:id="@+id/header"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dip"
android:background="@android:color/white">
<ImageView
android:id="@+id/aboutimg"
android:src="@drawable/logo_splash"
android:contentDescription="@string/aboutimg"
android:layout_margin="10dp"
tools:ignore="RtlHardcoded"
android:layout_width="85dp"
android:layout_height="85dp"
app:srcCompat="@drawable/logo_splash" />
<TextView
android:text="@string/rmstu"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/textView5"
android:layout_toEndOf="@+id/aboutimg"
android:layout_marginTop="20dp"
android:textStyle="bold"
android:textSize="18sp"
android:textColor="@android:color/holo_red_dark"
android:layout_marginLeft="10dp"
tools:ignore="RtlHardcoded"
tools:text="RMSTU" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/version"
android:text="@string/version_1_0"
android:layout_below="@+id/textView5"
android:layout_toEndOf="@+id/aboutimg"
android:textStyle="normal"
android:layout_marginTop="10dp"
android:textSize="18sp"
android:layout_marginLeft="10dp"
tools:ignore="RtlHardcoded"
android:textColor="@android:color/black"
tools:text="Version : 1.0" />
</RelativeLayout>
<ScrollView
android:layout_width="match_parent"
android:id="@+id/scrollViewab1"
android:layout_marginTop="5dp"
android:layout_height="200dip">
<LinearLayout
android:layout_width="match_parent"
android:id="@+id/body"
android:layout_height="wrap_content"
android:orientation="vertical"
android:background="#d8d7d7"
android:padding="10dip"
tools:ignore="RtlHardcoded">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/linear1"
android:layout_marginTop="8dp"
android:text="This Application is a free application for RMSTU. Your support and suggestions are very important to us to make this application better!"
tools:ignore="HardcodedText"
android:textSize="14sp"
android:contentDescription="aboutdescription1"
android:textColor="@android:color/black"
android:padding="3dp"
android:maxLines="12"
android:scrollbars="vertical"
/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/linear2"
android:layout_marginTop="8dp"
android:text="@string/Thanksto"
tools:ignore="HardcodedText"
android:textSize="16sp"
android:contentDescription="aboutdescription1"
android:gravity="center_horizontal"
android:textColor="@android:color/black"
android:textStyle="bold" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/linear3"
android:layout_marginTop="2dp"
android:text="@string/Faculty_members"
tools:ignore="HardcodedText"
android:textSize="14sp"
android:contentDescription="aboutdescription1"
android:gravity="center_horizontal"
android:textColor="@android:color/black"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/linear4"
android:layout_marginTop="10dp"
android:text="@string/Specialthanksto"
tools:ignore="HardcodedText"
android:textSize="16sp"
android:contentDescription="aboutdescription1"
android:gravity="center_horizontal"
android:textColor="@android:color/black"
android:textStyle="bold" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/linear5"
android:layout_marginTop="5dp"
android:text="@string/juelshikder"
tools:ignore="HardcodedText"
android:textSize="16sp"
android:contentDescription="aboutdescription1"
android:gravity="center_horizontal"
android:textColor="@android:color/black"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/linear6"
android:layout_marginTop="2dp"
android:text="@string/dhiman_sir"
tools:ignore="HardcodedText"
android:textSize="16sp"
android:contentDescription="aboutdescription1"
android:gravity="center_horizontal"
android:textColor="@android:color/black"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/linear7"
android:layout_marginTop="2dp"
android:text="@string/Nishu_nath"
tools:ignore="HardcodedText"
android:textSize="16sp"
android:contentDescription="aboutdescription1"
android:gravity="center_horizontal"
android:textColor="@android:color/black"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/linear8"
android:layout_marginTop="2dp"
android:text="@string/Sojib_sir"
tools:ignore="HardcodedText"
android:textSize="16sp"
android:contentDescription="aboutdescription1"
android:gravity="center_horizontal"
android:textColor="@android:color/black"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/linear9"
android:layout_marginTop="20dp"
android:text="@string/Want_share"
tools:ignore="HardcodedText"
android:textSize="14sp"
android:contentDescription="aboutdescription1"
android:textColor="@android:color/black"
android:textStyle="bold"
android:paddingBottom="10dp" />
</LinearLayout>
</ScrollView>
<LinearLayout
android:id="@+id/footer"
android:layout_marginTop="5dip"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:background="@android:color/white"
android:padding="5dip">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/developer"
android:text="@string/developer"
android:textColor="#0b066d"
android:textSize="15sp"
android:textStyle="bold"
android:layout_marginTop="15dp"
android:layout_marginLeft="5dp"
tools:text="Developer Info :"
tools:ignore="RtlHardcoded" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/myname"
android:text="@string/shakib_saha"
android:textColor="#913807"
android:textSize="15sp"
android:layout_marginLeft="5dp"
android:textStyle="bold"
android:layout_marginTop="8dp"
tools:text="Shakib Saha"
tools:ignore="RtlHardcoded" />
<TextView
android:text="@string/student"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/student"
android:layout_marginLeft="5dp"
android:textColor="#913807"
android:textStyle="normal"
android:textSize="14sp"
tools:ignore="RtlHardcoded" />
<TextView
android:text="@string/rmstu"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/textView6"
android:textColor="#913807"
android:textStyle="normal"
android:layout_marginLeft="5dp"
android:textSize="14sp"
tools:ignore="RtlHardcoded" />
</LinearLayout>
</LinearLayout></FrameLayout>