實現的是最簡單的viewpager+fragment進行的操作,當然你也可以實現像百度新聞那種聯動的的效果,加上一個展示分類的控件,叫什麼我忘了。。。。
先來看看效果
就是一個最基礎的形式。
下面是代碼:
首先在佈局中進行viewpager控件的引入:
<android.support.v4.view.ViewPager
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/viewpager">
</android.support.v4.view.ViewPager>
然後創建好你的fragment對象,這裏由於是測試,所以簡單創建了一個Fragment的樣式:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:layout_width="match_parent"
android:background="#ffee00"
android:id="@+id/listview1"
android:layout_height="match_parent">
</ListView>
</LinearLayout>
在fragment上加載佈局:
package app.frag_viewpagerdemo;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
/**
* Created by Administrator on 2015/8/14 0014.
*/
public class FragmentOne extends Fragment {
private ListView listView;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view=inflater.inflate(R.layout.view1,null);
listView= (ListView) view.findViewById(R.id.listview1);
ArrayAdapter<String> arrayAdapter=new ArrayAdapter<String>(getActivity(),android.R.layout.simple_expandable_list_item_1);
for (int i=0;i<30;i++)
{
arrayAdapter.add("Fragment1"+i);
}
listView.setAdapter(arrayAdapter);
return view;
}
}
然後進行viewpager的pageadapter的適配
注意:這裏繼承FragmentPageAdapter進行配置,比較方便,當然你也可以繼承PageAdapter寫。
package app.frag_viewpagerdemo;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.view.View;
import java.util.List;
/**
* Created by Administrator on 2015/8/14 0014.
*/
public class MyPageAdapter extends FragmentPagerAdapter {
private List<Fragment> fragmentList;
public MyPageAdapter(FragmentManager fm,List<Fragment> fragmentList) {
super(fm);
this.fragmentList=fragmentList;
}
//得到Item,即所對應的fragment
@Override
public Fragment getItem(int position) {
return fragmentList.get(position);
}
@Override
public int getCount() {
return fragmentList.size();
}
}
Activity代碼:
public class MainActivity extends AppCompatActivity {
private ViewPager viewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewPager= (ViewPager) findViewById(R.id.viewpager);
FragmentManager fm=getSupportFragmentManager();
initData();
MyPageAdapter myPageAdapter=new MyPageAdapter(fm,fragments);
viewPager.setAdapter(myPageAdapter);
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
}
private List<Fragment> fragments;
private void initData() {
fragments=new ArrayList<>();
fragments.add(new FragmentOne());
fragments.add(new FragmentTwo());
}
}
你可以在
@Override
public void onPageSelected(int position) {
}
中進行當viewpager滑動變化時進行相關的操作,比如標題的變化等。