android TableLayout和Fragment複用
阿新 • • 發佈:2019-02-01
Android是在Android 3.0 (API level 11)開始引入Fragment的。Fragment可以使你能夠將activity分離成多個可重用的元件,每個都有它自己的生命週期和UI。那我們應該怎麼去建立fragment呢?Google已經考慮到這種情況了,所以推薦我們使用newInstance()的方式來建立,下面讓我們看一下到底怎麼使用吧!也是很簡單的!
例,我們要實現的效果圖,
MainActivity中:
public classMainActivityextendsAppCompatActivity {
private ViewPager vp;
private TabLayout tabLayout;
private MainAdapter mainAdapter;
private List<Fragment> fragments = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
vp = (ViewPager) findViewById(R.id.vp);
tabLayout = (TabLayout) findViewById(R.id.tab);
mainAdapter = new MainAdapter(getSupportFragmentManager());
fragments.add(MyFragment.newInstance("第一個fragment"));
fragments.add(MyFragment.newInstance("第二個fragment"));
fragments.add(MyFragment.newInstance("第三個fragment"));
mainAdapter.setFragments(fragments);
vp.setAdapter(mainAdapter);
//設定tabLayout
tabLayout.setupWithViewPager(vp);
//設定文字的顏色
tabLayout.setTabTextColors(Color.GRAY, Color.BLUE);
//設定下劃線的顏色
tabLayout.setSelectedTabIndicatorColor(Color.BLUE);
}
}
MainAdapter中:
/**
* Created by mac on 16-8-5.
*/
public classMainAdapterextendsFragmentPagerAdapter {
private List<Fragment> fragments;
private String[] titles = {"一頁", "二頁", "三頁"};
public MainAdapter(FragmentManager fm) {
super(fm);
}
public void setFragments(List<Fragment> fragments) {
this.fragments = fragments;
}
@Override
public Fragment getItem(int position) {
return fragments.get(position);
}
@Override
public int getCount() {
return fragments != null ? fragments.size() : 0;
}
@Override
public CharSequence getPageTitle(int position) {
return titles[position];
}
}
MyFragment中:
/**
* Created by mac on 16-8-6.
*/
public classMyFragmentextendsFragment {
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Bundle bundle = getArguments();
if (bundle != null) {
String name = bundle.get("name").toString();
Log.d("MyFragment", name);
}
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_my, null);
return view;
}
public static MyFragment newInstance(String name) {
Bundle args = new Bundle();
args.putString("name", name);
MyFragment fragment = new MyFragment();
fragment.setArguments(args);
return fragment;
}
}
MainActivity的佈局檔案:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context="com.example.mac.fragmentdemo.MainActivity">
<android.support.design.widget.TabLayout
android:id="@+id/tab"android:layout_width="match_parent"android:layout_height="wrap_content" />
<android.support.v4.view.ViewPager
android:id="@+id/vp"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_below="@id/tab" />
</RelativeLayout>
MyFragment的佈局檔案:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical">
<ImageView
android:id="@+id/iv"android:layout_width="wrap_content"android:layout_height="wrap_content"android:src="@mipmap/ic_launcher" />
</LinearLayout>
執行程式後,我們會發現控制檯出現資訊如下,
在這種情況下,newInstance()方法是一種“靜態工廠方法”,讓我們在初始化和設定一個新的fragment的時候省去呼叫它的構造方法和額外的setter方法。為你的Fragment提供靜態工廠方法是一種好的做法,因為它封裝和抽象了在客戶端構造物件所需的步驟,因此Google推薦使用,所我們就使用吧!