Java 片段集工具栏标题,但显示下一个片段标题
我是Android开发的新手,我正在尝试制作一个选项卡式活动,标题会根据片段的不同而变化。我尝试使用我在网上找到的以下代码,但是当加载第一个片段时,第二个片段标题显示在工具栏上Java 片段集工具栏标题,但显示下一个片段标题,java,android,android-fragments,Java,Android,Android Fragments,我是Android开发的新手,我正在尝试制作一个选项卡式活动,标题会根据片段的不同而变化。我尝试使用我在网上找到的以下代码,但是当加载第一个片段时,第二个片段标题显示在工具栏上 public class TabbedActivity extends AppCompatActivity { private SectionsPagerAdapter mSectionsPagerAdapter; private ViewPager mViewPager; public Toolbar toolbar
public class TabbedActivity extends AppCompatActivity {
private SectionsPagerAdapter mSectionsPagerAdapter;
private ViewPager mViewPager;
public Toolbar toolbar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tabbed);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.addOnTabSelectedListener(new TabLayout.ViewPagerOnTabSelectedListener(mViewPager));
mViewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
switch(position){
case 0:
return new FragmentActivity_1();
case 1:
return new FragmentActivity_2();
case 2:
return new FragmentActivity_3();
case 3:
return new FragmentActivity_4();
case 4:
return new FragmentActivity_5();
}
return null;
}
@Override
public int getCount() {
return 5;
}
}
}
片段代码之一:
public class FragmentActivity_chat extends Fragment{
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState){
View view = inflater.inflate(R.layout.chat_tabbed, container, false);
((TabbedActivity)getActivity()).toolbar.setTitle("Fragment 1");
return view;
}
}
选项卡式活动XML:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="com.android.MyApp.TabbedActivity">
<android.support.design.widget.AppBarLayout
android:id="@+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="@style/AppTheme.PopupOverlay"
app:title="@string/app_name">
</android.support.v7.widget.Toolbar>
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/colorPrimaryLight"
app:tabMode="fixed"
app:tabGravity="fill">
<android.support.design.widget.TabItem
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:icon="@drawable/ic_person_black_24dp"/>
<android.support.design.widget.TabItem
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:icon="@drawable/ic_chat_black_24dp"/>
<android.support.design.widget.TabItem
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:icon="@drawable/ic_location_on_black_24dp"/>
<android.support.design.widget.TabItem
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:icon="@drawable/ic_group_black_24dp"/>
<android.support.design.widget.TabItem
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:icon="@drawable/ic_settings_black_24dp"/>
</android.support.design.widget.TabLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
</android.support.design.widget.CoordinatorLayout>
非常感谢您的帮助 确定创建了
查看页面
,创建了第一个选项卡,也创建了第二个选项卡(出于性能原因或其他原因,请参见方法(默认值为1)。因此,第二个选项卡是在第一个选项卡之后创建的。这就是显示第二个选项卡文本的原因
在更新标题之前,应检查显示的选项卡
希望对您有所帮助您可以试试这个
1.使用addOnTabSelectedListener
final String[] mTitleNames = {"Fragment 1", "Fragment 2", "Fragment 3", "Fragment 4","Fragment 5"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tabbed);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
mViewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
// set default title
setActionBarTitle(mTitleNames[0]);
// add here
tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
int pos = tab.getPosition();
setToolbarTitle(mTitleNames[pos]);
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}
/**
* set toolbar title
* @param title
*/
public void setToolbarTitle(String title) {
getSupportActionBar().setTitle(title);
}
2.选择onTabSelected
时,您可以设置工具栏标题(mTitleNames[pos])代码>
final String[] mTitleNames = {"Fragment 1", "Fragment 2", "Fragment 3", "Fragment 4","Fragment 5"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tabbed);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
mViewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
// set default title
setActionBarTitle(mTitleNames[0]);
// add here
tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
int pos = tab.getPosition();
setToolbarTitle(mTitleNames[pos]);
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}
/**
* set toolbar title
* @param title
*/
public void setToolbarTitle(String title) {
getSupportActionBar().setTitle(title);
}
3.并删除((TabbedActivity)getActivity()).toolbar.setTitle(“片段1”)代码>在您的片段中
final String[] mTitleNames = {"Fragment 1", "Fragment 2", "Fragment 3", "Fragment 4","Fragment 5"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tabbed);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
mViewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
// set default title
setActionBarTitle(mTitleNames[0]);
// add here
tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
int pos = tab.getPosition();
setToolbarTitle(mTitleNames[pos]);
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}
/**
* set toolbar title
* @param title
*/
public void setToolbarTitle(String title) {
getSupportActionBar().setTitle(title);
}
使用以下代码,您的问题将得到解决:
public class TabbedActivity extends AppCompatActivity {
private SectionsPagerAdapter mSectionsPagerAdapter;
private ViewPager mViewPager;
public Toolbar toolbar;
public String[] tabtitles = {"FragmentActivity_1", "FragmentActivity_2", "FragmentActivity_3", "FragmentActivity_4", "FragmentActivity_5"};
public int[] icons = {R.mipmap.ic_launcher_round, R.mipmap.ic_launcher_round, R.mipmap.ic_launcher_round, R.mipmap.ic_launcher_round, R.mipmap.ic_launcher_round};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_tabbed);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
setTabIcon(tabLayout);
mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
getSupportActionBar().setTitle(tabtitles[position]);
}
@Override
public void onPageSelected(int position) {
getSupportActionBar().setTitle(tabtitles[position]);
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
}
private void setTabIcon(TabLayout tabLayout) {
int count = tabLayout.getTabCount();
for (int i = 0; i < count; i++) {
tabLayout.getTabAt(i).setIcon(icons[i]);
}
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
Fragment fragment = null;
switch (position) {
case 0:
fragment = new FragmentActivity_1();
break;
case 1:
fragment = new FragmentActivity_2();
break;
case 2:
fragment = new FragmentActivity_3();
break;
case 3:
fragment = new FragmentActivity_4();
break;
case 4:
fragment = new FragmentActivity_5();
break;
default:
fragment = new FragmentActivity_1();
break;
}
return fragment;
}
@Override
public int getCount() {
return 5;
}
}
}
公共类TabbedActivity扩展了AppCompatActivity{
私人部门SPAGERAAdapter MSECTIONSPAGERAAdapter;
私有视图寻呼机mViewPager;
公共工具栏;
公共字符串[]tabtitles={“FragmentActivity_1”、“FragmentActivity_2”、“FragmentActivity_3”、“FragmentActivity_4”、“FragmentActivity_5”};
public int[]图标={R.mipmap.ic_launcher_round,R.mipmap.ic_launcher_round,R.mipmap.ic_launcher_round,R.mipmap.ic_launcher_round};
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_选项卡);
toolbar=(toolbar)findviewbyd(R.id.toolbar);
设置支持操作栏(工具栏);
mSectionsPagerAdapter=newsectionspageradapter(getSupportFragmentManager());
mViewPager=(ViewPager)findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout TabLayout=(TabLayout)findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mviewpage);
设置选项卡图标(表格布局);
mViewPager.addOnPageChangeListener(新的ViewPager.OnPageChangeListener(){
@凌驾
已滚动页面上的公共无效(int-position、float-positionOffset、int-positionOffsetPixels){
getSupportActionBar().setTitle(选项卡标题[position]);
}
@凌驾
已选择页面上的公共无效(内部位置){
getSupportActionBar().setTitle(选项卡标题[position]);
}
@凌驾
公共无效onPageScrollStateChanged(int状态){
}
});
}
专用无效设置选项卡图标(TabLayout TabLayout){
int count=tabLayout.getTabCount();
for(int i=0;i
我已经测试了这段代码,它运行良好,检查图像