Fragment這個東西,我到現在才接觸到,之前沒有用到過,關于Fragment這個東西在官方文檔已經介紹了非常清楚了,我還特地轉載了官方API的中文翻譯,在這我就不浪費口舌了。簡單來說,Fragment就是為滿足大螢幕的而誕生的,手機螢幕小而平闆螢幕就大了,螢幕一大就會産生更多的互動,這是很容易想到的,那麼單純的Activity就不能滿足我們的需求了。
今天這個例子是自己做的一個小Demo,簡單使用了Fragment,是跟ViewPage結合一起使用的。我想實作的效果是,左右滑動可以從一個Fragment到另一個Fragment的過渡。
看看效果圖:
可以看到,兩個fragment都可有控件的點選事件,如果是兩個Activity我不知道怎麼實作,可能會稍微麻煩一點。
簡單的ViewPage布局:
/2013.09.05_ViewPage_Fragment_Demo/res/layout/activity_main.xml
[html] view plain copy
- <?xml version="1.0" encoding="utf-8"?>
- <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:layout_width="match_parent"
- android:layout_height="match_parent" >
- <android.support.v4.view.ViewPager
- android:id="@+id/viewpager"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:flipInterval="30"
- android:persistentDrawingCache="animation" />
- </RelativeLayout>
/2013.09.05_ViewPage_Fragment_Demo/res/layout/viewpager1.xml
[html] view plain copy
- <?xml version="1.0" encoding="UTF-8"?>
- <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- android:background="@drawable/guide_1" >
- <Button
- android:id="@+id/btn"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:layout_alignParentBottom="true"
- android:layout_centerHorizontal="true"
- android:layout_marginBottom="54dp"
- android:background="@drawable/butten"
- />
- </RelativeLayout>
/2013.09.05_ViewPage_Fragment_Demo/res/layout/viewpager2.xml
[html] view plain copy
- <?xml version="1.0" encoding="UTF-8"?>
- <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- android:background="@drawable/guide_2" >
- <Button
- android:id="@+id/btn"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:layout_alignParentBottom="true"
- android:layout_centerHorizontal="true"
- android:layout_marginBottom="54dp"
- android:background="@drawable/butten" />
- </RelativeLayout>
再來一個擴充卡:
/2013.09.05_ViewPage_Fragment_Demo/src/com/wwj/vf/adapter/FragAdapter.java
[java] view plain copy
- package com.wwj.vf.adapter;
- import java.util.List;
- import android.support.v4.app.Fragment;
- import android.support.v4.app.FragmentManager;
- import android.support.v4.app.FragmentPagerAdapter;
- public class FragAdapter extends FragmentPagerAdapter{
- private List<Fragment> fragments;
- public FragAdapter(FragmentManager fm) {
- super(fm);
- }
- public FragAdapter(FragmentManager fm, List<Fragment> fragments) {
- super(fm);
- this.fragments = fragments;
- }
- @Override
- public Fragment getItem(int position) {
- return fragments.get(position);
- }
- @Override
- public int getCount() {
- return fragments.size();
- }
- }
兩個自定義的Fragment
這裡很簡單,一張背景+一個按鈕
/2013.09.05_ViewPage_Fragment_Demo/src/com/wwj/vf/ui/MyFragment1.java
[java] view plain copy
- package com.wwj.vf.ui;
- import com.wwj.vf.R;
- import android.os.Bundle;
- import android.support.v4.app.Fragment;
- import android.view.LayoutInflater;
- import android.view.View;
- import android.view.View.OnClickListener;
- import android.view.ViewGroup;
- import android.widget.Button;
- import android.widget.Toast;
- public class MyFragment1 extends Fragment {
- private Button btn;
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- }
- @Override
- public View onCreateView(LayoutInflater inflater, ViewGroup container,
- Bundle savedInstanceState) {
- View view = inflater.inflate(R.layout.viewpager1, container, false);
- btn = (Button) view.findViewById(R.id.btn);
- btn.setOnClickListener(new OnClickListener() {
- @Override
- public void onClick(View v) {
- Toast.makeText(getActivity(), "你點我啦,好壞!!!", Toast.LENGTH_LONG).show();
- }
- });
- return view;
- }
- @Override
- public void onActivityCreated(Bundle savedInstanceState) {
- super.onActivityCreated(savedInstanceState);
- }
- @Override
- public void onPause() {
- super.onPause();
- }
- }
/2013.09.05_ViewPage_Fragment_Demo/src/com/wwj/vf/ui/MyFragment2.java
[java] view plain copy
- package com.wwj.vf.ui;
- import android.os.Bundle;
- import android.support.v4.app.Fragment;
- import android.view.LayoutInflater;
- import android.view.View;
- import android.view.View.OnClickListener;
- import android.view.ViewGroup;
- import android.widget.Button;
- import android.widget.Toast;
- import com.wwj.vf.R;
- public class MyFragment2 extends Fragment {
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- }
- @Override
- public View onCreateView(LayoutInflater inflater, ViewGroup container,
- Bundle savedInstanceState) {
- View view = inflater.inflate(R.layout.viewpager2, container, false);
- view.findViewById(R.id.btn).setOnClickListener(new OnClickListener() {
- @Override
- public void onClick(View v) {
- Toast.makeText(getActivity(), "這個Fragment2哦,要注意了!!", Toast.LENGTH_SHORT).show();
- }
- });
- return view;
- }
- @Override
- public void onActivityCreated(Bundle savedInstanceState) {
- super.onActivityCreated(savedInstanceState);
- }
- @Override
- public void onPause() {
- super.onPause();
- }
- }
好啦,在Activity裡添加兩個Fragment
[java] view plain copy
- package com.wwj.vf;
- import java.util.ArrayList;
- import java.util.List;
- import android.os.Bundle;
- import android.support.v4.app.Fragment;
- import android.support.v4.app.FragmentActivity;
- import android.support.v4.view.ViewPager;
- import com.wwj.vf.adapter.FragAdapter;
- import com.wwj.vf.ui.MyFragment1;
- import com.wwj.vf.ui.MyFragment2;
- public class MainActivity extends FragmentActivity {
- private ViewPager vp;
- private FragAdapter adapter;
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_main);
- vp = (ViewPager) findViewById(R.id.viewpager);
- List<Fragment> fragments = new ArrayList<Fragment>();
- fragments.add(new MyFragment1());
- fragments.add(new MyFragment2());
- adapter = new FragAdapter(getSupportFragmentManager(), fragments);
- vp.setAdapter(adapter);
- vp.setCurrentItem(0);
- }
- }
簡單的ViewPage和Fragment的搭配使用就這樣了。