我创建了一个活动，并尝试将一个片段插入到活动中，但是在运行它时，片段在创建活动时不会出现。只是一个空格，没有构建错误。
感谢您提前提供任何帮助。
MainActivity.java
public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final HomeFragment homeFragment = new HomeFragment();
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
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);
getFragmentManager().beginTransaction()
.replace(R.id.main_container, homeFragment).commit();
}
@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_activity_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;
} else if (id == R.id.search_mag_icon){
// Open intent here
Intent i = new Intent(getApplicationContext(), SearchActivity.class);
startActivity(i);
}
return super.onOptionsItemSelected(item);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_register) {
Intent i = new Intent(getApplicationContext(), RegisterActivity.class);
startActivity(i);
} else if (id == R.id.nav_login) {
Intent i = new Intent(getApplicationContext(), LoginActivity.class);
startActivity(i);
} else if (id == R.id.nav_my_listings) {
// navigate to my listings
} else if (id == R.id.nav_how) {
// navigate to how it works page
} else if (id == R.id.nav_help) {
// navigate to help page
} else if (id == R.id.nav_contact_us) {
// navigate to contact page,
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}
HomeFragment.java
public class HomeFragment extends Fragment {
ImageView bookIcon;
ImageView barcodeIcon;
ImageView messageIcon;
ImageView listIcon;
public HomeFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_home, container, false);
setHomeIcons(rootView);
return rootView;
}
public void setHomeIcons(View rootView){
bookIcon = (ImageView)rootView.findViewById(R.id.bookIcon);
bookIcon.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// Launching All products Activity
Intent i = new Intent(getActivity().getApplicationContext(), BrowseUniCourseActivity.class);
startActivity(i);
}
});
barcodeIcon = (ImageView)rootView.findViewById(R.id.barcodeIcon);
barcodeIcon.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Snackbar.make(v, "Will open 'Barcode' Intent", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
messageIcon = (ImageView)rootView.findViewById(R.id.messageIcon);
messageIcon.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Snackbar.make(v, "Will open 'My Messages' Intent", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
listIcon = (ImageView)rootView.findViewById(R.id.listIcon);
listIcon.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Snackbar.make(v, "Will open 'My Listings' Intent", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
}
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:background="#FFF"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:openDrawer="start">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<include
android:layout_width="match_parent"
android:layout_height="match_parent"
layout="@layout/app_bar_main" />
<FrameLayout
android:id="@+id/main_container"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</FrameLayout>
</LinearLayout>
<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"
android:background="@color/colorPrimaryDark"
app:itemTextColor="#FFF"
app:itemIconTint="#FFF"
app:headerLayout="@layout/nav_header_main"
app:menu="@menu/activity_main_drawer" />
</android.support.v4.widget.DrawerLayout>
fragment_home.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">
<!-- Book icon and text -->
<ImageView
android:id="@+id/bookIcon"
android:layout_width="100dip"
android:layout_height="100dip"
android:layout_marginLeft="50dip"
android:layout_marginTop="110dip"
android:src="@drawable/book" />
<TextView
android:id="@+id/bookLabel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/bookIcon"
android:layout_marginLeft="20dip"
android:text="@string/bookLabel"
android:textColor="@color/colorAlt"
android:textStyle="bold" />
<!-- Barcode icon and text -->
<ImageView
android:id="@+id/barcodeIcon"
android:layout_width="95dip"
android:layout_height="95dip"
android:layout_marginLeft="260dip"
android:layout_marginTop="120dip"
android:src="@drawable/barcode" />
<TextView
android:id="@+id/barcodeLabel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/barcodeIcon"
android:layout_marginLeft="260dip"
android:paddingTop="5dip"
android:text="@string/barcodeLabel"
android:textColor="@color/colorAlt"
android:textStyle="bold" />
<!-- Message icon and text -->
<ImageView
android:id="@+id/messageIcon"
android:layout_width="100dip"
android:layout_height="100dip"
android:layout_marginLeft="50dip"
android:layout_marginTop="350dip"
android:src="@drawable/email" />
<TextView
android:id="@+id/messageLabel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/messageIcon"
android:layout_marginLeft="55dip"
android:text="@string/messageLabel"
android:textColor="@color/colorAlt"
android:textStyle="bold" />
<!-- List icon and text -->
<ImageView
android:id="@+id/listIcon"
android:layout_width="95dip"
android:layout_height="95dip"
android:layout_marginLeft="260dip"
android:layout_marginTop="350dip"
android:src="@drawable/list" />
<TextView
android:id="@+id/listLabel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/listIcon"
android:layout_marginLeft="273dip"
android:paddingTop="5dip"
android:text="@string/listLabel"
android:textColor="@color/colorAlt"
android:textStyle="bold" />
</RelativeLayout>
答案 0 :(得分：1)
好的，我想我明白了。将包含移到LinearLayout外部
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