`面对我创建一个分页器视图和两个片段的android中的一个问题,可以说片段A和片段B被附加了...
我的问题是:在片段A中有一个按钮,单击该按钮后,我要加载片段C,这将替换同一寻呼机视图中的片段A,该怎么做?但是,当我尝试下面的代码时,片段C的片段中显示了片段C的代码内容...您能帮我吗?我到处搜索,但没有找到正确的解决方案。 这是我的代码...
public class MainActivity extends AppCompatActivity implements Top_Fragment.OnFragmentInteractionListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar=findViewById(R.id.tool_bar);
setSupportActionBar(toolbar);
MyPagerAdapter myPagerAdapter = new MyPagerAdapter(getSupportFragmentManager());
ViewPager viewPager = findViewById(R.id.pagerView);
viewPager.setAdapter(myPagerAdapter);
TabLayout tabLayout=findViewById(R.id.tab_bar);
tabLayout.setupWithViewPager(viewPager);
}
class MyPagerAdapter extends FragmentPagerAdapter {
public MyPagerAdapter(@NonNull FragmentManager fm) {
super(fm, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT);
}
@Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new Top_Fragment();
case 1:
return new FavoriteFrag();
}
return null;
}
@Override
public int getCount() {
return 2;
}
@Nullable
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return getResources().getString(R.string.Items);
case 1:
return getResources().getString(R.string.favoriteItems);
}
return null;
}
}
@Override
public void onFragmentInteraction(int position) {
Fragment fragment=null;
switch (position){
case 0:
fragment=new DrikCategaryFrag();
}
FragmentTransaction ft=getSupportFragmentManager().beginTransaction();
ft.replace(R.id.frameContainer,fragment);
ft.commit();
}
}
主要活动布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
<androidx.appcompat.widget.Toolbar
android:id="@+id/tool_bar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar" />
<com.google.android.material.tabs.TabLayout
android:id="@+id/tab_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</com.google.android.material.appbar.AppBarLayout>
<FrameLayout
android:id="@+id/frameContainer"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.viewpager.widget.ViewPager
android:id="@+id/pagerView"
android:layout_width="match_parent"
android:layout_height="match_parent">
</androidx.viewpager.widget.ViewPager>
</FrameLayout>
</LinearLayout>
答案 0 :(得分:0)
尝试一下:
具有多个片段的Viewpager:
public class MainActivity extends FragmentActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ViewPager pager = (ViewPager) findViewById(R.id.viewPager);
pager.setAdapter(new MyPagerAdapter(getSupportFragmentManager()));
}
private class MyPagerAdapter extends FragmentPagerAdapter {
public MyPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int pos) {
switch(pos) {
case 0: return FirstFragment.newInstance("FirstFragment, Instance 1");
case 1: return SecondFragment.newInstance("SecondFragment, Instance 1");
default: return FirstFragment.newInstance("FirstFragment, Default");
}
}
@Override
public int getCount() {
return 2;
}
}
}
activity_main.xml
<android.support.v4.view.ViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/viewPager"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
FirstFragment.java
public class FirstFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.first_frag, container, false);
TextView tv = (TextView) v.findViewById(R.id.tvFragFirst);
tv.setText(getArguments().getString("msg"));
return v;
}
public static FirstFragment newInstance(String text) {
FirstFragment f = new FirstFragment();
Bundle b = new Bundle();
b.putString("msg", text);
f.setArguments(b);
return f;
}
}
SecondFragment.java
public class SecondFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.second_frag, container, false);
TextView tv = (TextView) v.findViewById(R.id.tvFragSecond);
tv.setText(getArguments().getString("msg"));
return v;
}
public static SecondFragment newInstance(String text) {
SecondFragment f = new SecondFragment();
Bundle b = new Bundle();
b.putString("msg", text);
f.setArguments(b);
return f;
}
}