片段加入到活性,但不显示 [英] Fragment added to activity but does not show
本文介绍了片段加入到活性,但不显示的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我已经创建了一个活动,并试图插入片段导入的活性,但在运行时创建的活动时的片段不会出现。只是一个空白,没有生成错误。
感谢提前任何帮助。
MainActivity.java
公共类MainActivity扩展AppCompatActivity实现NavigationView.OnNavigationItemSelectedListener {
@覆盖
保护无效的onCreate(捆绑savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.activity_main); 最后HomeFragment homeFragment =新HomeFragment(); 工具条工具栏=(栏)findViewById(R.id.toolbar);
setSupportActionBar(工具栏); DrawerLayout抽屉=(DrawerLayout)findViewById(R.id.drawer_layout);
ActionBarDrawerToggle切换=新ActionBarDrawerToggle(
对此,抽屉,工具栏,R.string.navigation_drawer_open,R.string.navigation_drawer_close);
drawer.setDrawerListener(切换);
toggle.syncState(); NavigationView navigationView =(NavigationView)findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(本); getFragmentManager()调用BeginTransaction()
.replace(R.id.main_container,homeFragment).commit();
} @覆盖
公共无效onBack pressed(){
DrawerLayout抽屉=(DrawerLayout)findViewById(R.id.drawer_layout);
如果(drawer.isDrawerOpen(GravityCompat.START)){
drawer.closeDrawer(GravityCompat.START);
}其他{
super.onBack pressed();
}
} @覆盖
公共布尔onCreateOptionsMenu(菜单菜单){
//充气菜单;如果是present这增加了项目操作栏。
。getMenuInflater()膨胀(R.menu.main_activity_main,菜单);
返回true;
} @覆盖
公共布尔onOptionsItemSelected(菜单项项){
//处理动作栏项目点击这里。操作栏会
//自动处理上点击主页/向上按钮,只要
//你在AndroidManifest.xml中指定一个父活动。
INT ID = item.getItemId(); // noinspection SimplifiableIfStatement
如果(ID == R.id.action_settings){
返回true;
}否则如果(ID == R.id.search_mag_icon){
//此处打开意图
意图I =新意图(getApplicationContext(),SearchActivity.class);
startActivity(ⅰ);
} 返回super.onOptionsItemSelected(项目);
} @燮pressWarnings(StatementWithEmptyBody)
@覆盖
公共布尔onNavigationItemSelected(菜单项项){
//处理导航视图项点击这里。
INT ID = item.getItemId(); 如果(ID == R.id.nav_register){
意图I =新意图(getApplicationContext(),RegisterActivity.class);
startActivity(ⅰ);
}否则如果(ID == R.id.nav_login){
意图I =新意图(getApplicationContext(),LoginActivity.class);
startActivity(ⅰ);
}否则如果(ID == R.id.nav_my_listings){
//浏览我的房源
}否则如果(ID == R.id.nav_how){
//浏览到它是如何工作页面
}否则如果(ID == R.id.nav_help){
//导航帮助页面
}否则如果(ID == R.id.nav_contact_us){
//浏览网页联系,
} DrawerLayout抽屉=(DrawerLayout)findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
返回true;
}
}
HomeFragment.java
公共类HomeFragment扩展片段{ ImageView的bookIcon;
ImageView的酒吧codeIcon;
ImageView的messageIcon;
ImageView的listIcon;
公共HomeFragment(){
} @覆盖
公共查看onCreateView(LayoutInflater充气器,容器的ViewGroup,
捆绑savedInstanceState){
查看rootView = inflater.inflate(R.layout.fragment_home,集装箱,FALSE); setHomeIcons(rootView); 返回rootView;
} 公共无效setHomeIcons(查看rootView){
bookIcon =(ImageView的)rootView.findViewById(R.id.bookIcon);
bookIcon.setOnClickListener(新View.OnClickListener(){
@覆盖
公共无效的onClick(视图v){
//启动所有产品活动
意图I =新意图(getActivity()getApplicationContext(),BrowseUniCourseActivity.class。);
startActivity(ⅰ);
}
}); 酒吧codeIcon =(ImageView的)rootView.findViewById(R.id.bar codeIcon);
酒吧codeIcon.setOnClickListener(新View.OnClickListener(){
@覆盖
公共无效的onClick(视图v){
Snackbar.make(V,将打开栏code'的意图,Snackbar.LENGTH_LONG)
.setAction(动作,NULL).show();
}
}); messageIcon =(ImageView的)rootView.findViewById(R.id.messageIcon);
messageIcon.setOnClickListener(新View.OnClickListener(){
@覆盖
公共无效的onClick(视图v){
Snackbar.make(V,将打开我的信息意愿,Snackbar.LENGTH_LONG)
.setAction(动作,NULL).show(); }
}); listIcon =(ImageView的)rootView.findViewById(R.id.listIcon);
listIcon.setOnClickListener(新View.OnClickListener(){
@覆盖
公共无效的onClick(视图v){
Snackbar.make(V,将打开我的房源意愿,Snackbar.LENGTH_LONG)
.setAction(动作,NULL).show();
}
});
}
}
activity_main.xml中
<?XML版本=1.0编码=UTF-8&GT?;
< android.support.v4.widget.DrawerLayout
的xmlns:机器人=http://schemas.android.com/apk/res/android
的xmlns:程序=http://schemas.android.com/apk/res-auto
的xmlns:工具=http://schemas.android.com/tools
机器人:ID =@ + ID / drawer_layout
机器人:背景=#FFF
机器人:layout_width =match_parent
机器人:layout_height =match_parent
机器人:fitsSystemWindows =真
工具:openDrawer =开始> <的LinearLayout
机器人:layout_width =match_parent
机器人:layout_height =match_parent
机器人:方向=垂直> <包括
机器人:layout_width =match_parent
机器人:layout_height =match_parent
布局=@布局/ app_bar_main/> <的FrameLayout
机器人:ID =@ + ID / main_container
机器人:layout_width =match_parent
机器人:layout_height =match_parent>
< /&的FrameLayout GT;
< / LinearLayout中> < android.support.design.widget.NavigationView
机器人:ID =@ + ID / nav_view
机器人:layout_width =WRAP_CONTENT
机器人:layout_height =match_parent
机器人:layout_gravity =开始
机器人:fitsSystemWindows =真
机器人:背景=@彩色/ colorPrimaryDark
应用:itemTextColor =#FFF
应用:itemIconTint =#FFF
应用:headerLayout =@布局/ nav_header_main
应用:菜单=@菜单/ activity_main_drawer/>< /android.support.v4.widget.DrawerLayout>
fragment_home.xml
<?XML版本=1.0编码=UTF-8&GT?;
< RelativeLayout的
的xmlns:机器人=http://schemas.android.com/apk/res/android
机器人:layout_width =match_parent
机器人:layout_height =match_parent> <! - 书图标和文本 - >
< ImageView的
机器人:ID =@ + ID / bookIcon
机器人:layout_width =100dip
机器人:layout_height =100dip
机器人:layout_marginLeft =50dip
机器人:layout_marginTop =110dip
机器人:SRC =@绘制/书/> <的TextView
机器人:ID =@ + ID / bookLabel
机器人:layout_width =WRAP_CONTENT
机器人:layout_height =WRAP_CONTENT
机器人:layout_below =@ + ID / bookIcon
机器人:layout_marginLeft =20dip
机器人:文字=@字符串/ bookLabel
机器人:文字颜色=@彩色/ colorAlt
机器人:文字样式=大胆/>
<! - 酒吧code图标和文本 - >
< ImageView的
机器人:ID =@ + ID /酒吧codeIcon
机器人:layout_width =95dip
机器人:layout_height =95dip
机器人:layout_marginLeft =260dip
机器人:layout_marginTop =120dip
机器人:SRC =@绘制/酒吧code/> <的TextView
机器人:ID =@ + ID /酒吧codeLabel
机器人:layout_width =WRAP_CONTENT
机器人:layout_height =WRAP_CONTENT
机器人:layout_below =@ + ID /酒吧codeIcon
机器人:layout_marginLeft =260dip
机器人:paddingTop =5dip
机器人:文字=@字符串/酒吧codeLabel
机器人:文字颜色=@彩色/ colorAlt
机器人:文字样式=大胆/>
<! - 留言图标和文本 - >
< ImageView的
机器人:ID =@ + ID / messageIcon
机器人:layout_width =100dip
机器人:layout_height =100dip
机器人:layout_marginLeft =50dip
机器人:layout_marginTop =350dip
机器人:SRC =@绘制/邮件/> <的TextView
机器人:ID =@ + ID / messageLabel
机器人:layout_width =WRAP_CONTENT
机器人:layout_height =WRAP_CONTENT
机器人:layout_below =@ + ID / messageIcon
机器人:layout_marginLeft =55dip
机器人:文字=@字符串/ messageLabel
机器人:文字颜色=@彩色/ colorAlt
机器人:文字样式=大胆/> <! - 列表图标和文本 - >
< ImageView的
机器人:ID =@ + ID / listIcon
机器人:layout_width =95dip
机器人:layout_height =95dip
机器人:layout_marginLeft =260dip
机器人:layout_marginTop =350dip
机器人:SRC =@绘制/目录/> <的TextView
机器人:ID =@ + ID / listLabel
机器人:layout_width =WRAP_CONTENT
机器人:layout_height =WRAP_CONTENT
机器人:layout_below =@ + ID / listIcon
机器人:layout_marginLeft =273dip
机器人:paddingTop =5dip
机器人:文字=@字符串/ listLabel
机器人:文字颜色=@彩色/ colorAlt
机器人:文字样式=大胆/> < / RelativeLayout的>
解决方案
好吧,我想我明白了。移动包括你的LinearLayout以外
<包括
机器人:layout_width =match_parent
机器人:layout_height =match_parent
布局=@布局/ app_bar_main/>
<的LinearLayout
机器人:layout_width =match_parent
机器人:layout_height =match_parent
机器人:方向=垂直>
<的FrameLayout
机器人:ID =@ + ID / main_container
机器人:layout_width =match_parent
机器人:layout_height =match_parent>
< /&的FrameLayout GT;
< / LinearLayout中>
I have created an activity and tried to insert a fragment into the activity, but when running it the fragment does not appear when the activity is created. Just a blank space, there are no build errors.
Thanks for any help in advance.
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
<?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>
解决方案
Ok I think i got it. Move the include to outside of your LinearLayout
<include
android:layout_width="match_parent"
android:layout_height="match_parent"
layout="@layout/app_bar_main" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<FrameLayout
android:id="@+id/main_container"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</FrameLayout>
</LinearLayout>
这篇关于片段加入到活性,但不显示的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
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