TabLayout與ViewPager結合使用
阿新 • • 發佈：2019-01-02
:TabLayout是安卓6.0推出的，可以替代 ViewPagerIndicator 的一個控制元件，存放在 design 包下，繼承自 HorizontalScrollView 。使用TabLayout需要匯入依賴
implementation 'com.android.support:design:27.1.1'
整體效果就是外部是一個幀佈局切換fragment(訊息1.2.3),在訊息1的fragment中實現的TabLayout+ViewPage
MainActivity實現fragment(訊息1.2.3)的切換
MainActivity佈局
<?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" tools:context=".MainActivity" android:orientation="vertical"> <FrameLayout android:id="@+id/frameLt" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="8"> </FrameLayout> <RadioGroup android:layout_marginTop="20dp" android:id="@+id/radioGroup" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1" android:orientation="horizontal"> <RadioButton android:id="@+id/btn01" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:button="@null" android:gravity="center" android:drawableTop="@drawable/radiobtn_selector" android:text="訊息(1)"/> <RadioButton android:id="@+id/btn02" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:button="@null" android:gravity="center" android:drawableTop="@drawable/radiobtn_selector" android:text="訊息(2)"/> <RadioButton android:id="@+id/btn03" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:button="@null" android:gravity="center" android:drawableTop="@drawable/radiobtn_selector" android:text="訊息(3)"/> </RadioGroup> </LinearLayout>
MainActivity程式碼
public class MainActivity extends AppCompatActivity { private Toolbar tool; private FragmentManager manager; private RadioGroup radioGroup; @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP) @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //載入元件 radioGroup = findViewById(R.id.radioGroup); //獲取事務管理 manager = getSupportFragmentManager(); //開啟事務 FragmentTransaction fragmentTransaction = manager.beginTransaction(); //新增事務 fragmentTransaction.add(R.id.frameLt,new Fragment01()); //提交事務 fragmentTransaction.commit(); //第一個Radiobutton預設選中 radioGroup.check(radioGroup.getChildAt(0).getId()); //radioGroup的監聽 radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() { @Override public void onCheckedChanged(RadioGroup radioGroup, int i) { //開啟新事務,上一個已經提交 FragmentTransaction fragmentTransaction2 = manager.beginTransaction(); switch (i){ case R.id.btn01: //替換fragment fragmentTransaction2.replace(R.id.frameLt,new Fragment01()); break; case R.id.btn02: fragmentTransaction2.replace(R.id.frameLt,new Fragment02()); break; case R.id.btn03: fragmentTransaction2.replace(R.id.frameLt,new Fragment03()); break; } fragmentTransaction2.commit(); } }); }
fragment(訊息1)佈局
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <android.support.design.widget.TabLayout android:id="@+id/tabLt" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="#ffbb"> </android.support.design.widget.TabLayout> <android.support.v4.view.ViewPager android:id="@+id/pager" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1"> </android.support.v4.view.ViewPager> </LinearLayout>
fragment(訊息1)java程式碼
fragment(訊息1)實現今天的重點,剩下的fragment程式碼就不發了
public class Fragment01 extends Fragment {
private TabLayout tabLt;
private ViewPager pager;
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment01,container,false);
//載入元件
tabLt = view.findViewById(R.id.tabLt);
pager = view.findViewById(R.id.pager);
//tab與pager繫結
tabLt.setupWithViewPager(pager);
//tablayout的顯示模式;
tabLt.setTabMode(TabLayout.MODE_FIXED);
//pager輪播集合
List<Fragment> list = new ArrayList<Fragment>();
list.add(new Fragment04());
list.add(new Fragment05());
list.add(new Fragment06());
//tab要展示的文字集合
List<String> slist = new ArrayList<String>();
for (int i=0;i<list.size();i++){
slist.add("標題"+i);
}
//介面卡
//getFragmentManager()所得到的是所在fragment 的父容器的管理器，
//getChildFragmentManager()所得到的是在fragment 裡面子容器的管理器。
MyPagerAdapter myPagerAdapter = new MyPagerAdapter(getChildFragmentManager(),list,slist);
pager.setAdapter(myPagerAdapter);
return view;
}
}
介面卡
public class MyPagerAdapter extends FragmentPagerAdapter {
private List<Fragment> list;
private List<String> slist;
public MyPagerAdapter(FragmentManager fm,List<Fragment> list,List<String> slist) {
super(fm);
this.list =list;
this.slist = slist;
}
@Override
public Fragment getItem(int position) {
Fragment fragment = list.get(position);
return fragment;
}
@Override
public int getCount() {
return slist.size();
}
@Nullable
@Override
//返回標題,返回給tab
public CharSequence getPageTitle(int position) {
return slist.get(position);
}
}
ps:本人組織語言很差,望大家海涵
