兔子--Fragment与ViewPager要切换滑动效果

时间：2023-03-08 20:50:44

效果图：

兔子--Fragment与ViewPager要切换滑动效果

文件夹结构：

兔子--Fragment与ViewPager要切换滑动效果

代码分析：

MainActivity.java

package com.example.myfragment;

/**

 * @author Arthur Lee

 * @time 04/08/2014

 * */

import java.util.ArrayList;

import android.os.Bundle;

import android.support.v4.app.Fragment;

import android.support.v4.app.FragmentActivity;

import android.support.v4.view.ViewPager;

import android.support.v4.view.ViewPager.OnPageChangeListener;

import android.util.Log;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.LinearLayout;

import android.widget.RadioButton;

import com.fragment.FirstFragment;

import com.fragment.FourthFragment;

import com.fragment.SecondFragment;

import com.fragment.ThirdFragment;

public class MainActivity extends FragmentActivity {

	ArrayList<Fragment> fragment;

	public static ViewPager viewpager;

	public static ArrayList<RadioButton> rb;

	LinearLayout lLayout;

	// ViewPager的适配器。但为了和Fragment相结合。要自己定义适配器

	MyAdapter adapter;

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.activity_main);

		initView();

		initButton();

		initAdapter();

	}

	public void initView() {

		viewpager = (ViewPager) findViewById(R.id.main_viewpager);

		lLayout = (LinearLayout) findViewById(R.id.zone_rbt);

		fragment = new ArrayList<Fragment>();

		fragment.add(new FirstFragment());

		fragment.add(new SecondFragment());

		fragment.add(new ThirdFragment());

		fragment.add(new FourthFragment());

	}

	public void initAdapter() {

		adapter = new MyAdapter(getSupportFragmentManager(), fragment);

		viewpager.setAdapter(adapter);

		viewpager.setOnPageChangeListener(myOnPageChangeListener);

		// 默认显示的页面

		viewpager.setCurrentItem(0);

		rb.get(0).setChecked(true);

	}

	public void initButton() {

		rb = new ArrayList<RadioButton>();

		rb.add((RadioButton) findViewById(R.id.rb_first));// 1号

		rb.add((RadioButton) findViewById(R.id.rb_second));// 2号

		rb.add((RadioButton) findViewById(R.id.rb_third));// 3号

		rb.add((RadioButton) findViewById(R.id.rb_fourth));// 4号

		for (int i = 0; i < rb.size(); i++) {

			rb.get(i).setOnClickListener(new MyListener(i));

		}

	}

	public class MyListener implements OnClickListener {

		private int index;

		public MyListener(int index) {

			this.index = index;

		}

		@Override

		public void onClick(View v) {

			viewpager.setCurrentItem(index);

			rb.get(index).setChecked(true);

		}

	}

	OnPageChangeListener myOnPageChangeListener = new OnPageChangeListener() {

		// 页卡状态改变时候。

		@Override

		public void onPageScrollStateChanged(int arg0) {

			Log.i("Main", "onPageScrollStateChanged");

		}

		// 页卡切换过程中

		@Override

		public void onPageScrolled(int arg0, float arg1, int arg2) {

			Log.i("Main", "onPageScrolled");

		}

		// 当radioButton被选中

		@Override

		public void onPageSelected(int position) {

			Log.i("Main", "onPageSelected");

			rb.get(position).setChecked(true);

		}

	};

}

MyAdapter.java

package com.example.myfragment;

import java.util.ArrayList;

import android.support.v4.app.Fragment;

import android.support.v4.app.FragmentManager;

import android.support.v4.app.FragmentPagerAdapter;

public class MyAdapter extends FragmentPagerAdapter {

	private ArrayList<Fragment> fragment;

	public MyAdapter(FragmentManager fm) {

		super(fm);

		// TODO Auto-generated constructor stub

	}

	public MyAdapter(FragmentManager fm, ArrayList<Fragment> fragment) {

		super(fm);

		// TODO Auto-generated constructor stub

		this.fragment = fragment;

	}

	@Override

	public Fragment getItem(int position) {

		// TODO Auto-generated method stub

		return fragment.get(position);

	}

	@Override

	public int getCount() {

		// TODO Auto-generated method stub

		return fragment.size();

	}

}

FirstFragment.java

package com.fragment;

/**

 * @author Arthur Lee

 * @time 04/08/2014

 * */

import com.example.myfragment.R;

import android.os.Bundle;

import android.support.v4.app.Fragment;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

public class FirstFragment extends Fragment{

	    //缓存视图

		private View view;

		@Override

		public void onCreate(Bundle savedInstanceState) {

			// TODO Auto-generated method stub

			super.onCreate(savedInstanceState);

		}

		@Override

		public View onCreateView(LayoutInflater inflater, ViewGroup container,

				Bundle savedInstanceState) {

			// TODO Auto-generated method stub

			//假设当前视图为空，初始化视图

			if(view == null){

				//指定当前视图在viewpager中显示的是view_first。xml,通过LayoutInflater来指定.

				view = inflater.inflate(R.layout.view_first, null);

			}

			//指定当前视图的父类，以便调用父类的移除功能。

ViewGroup parent = (ViewGroup) view.getParent();

		    if (parent != null) {

				parent.removeView(view);

			}

			return view;

		}

}

其它的三个与这个类似。不再提供。

以下是布局文件

main_activity.xml

<LinearLayout xmlns: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"

    android:orientation="vertical"

    tools:context=".MainActivity" >

    <!-- 纵向分布两个，以AB标记 -->

    <!-- A -->

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:layout_weight="1" >

        <android.support.v4.view.ViewPager

            android:id="@+id/main_viewpager"

            android:layout_width="match_parent"

            android:layout_height="match_parent" >

        </android.support.v4.view.ViewPager>

    </LinearLayout>

    <!-- B -->

    <LinearLayout

        android:id="@+id/zone_rbt"

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:layout_weight="6"

        android:orientation="horizontal" >

        <RadioGroup

            android:layout_width="match_parent"

            android:layout_height="match_parent"

            android:gravity="center"

            android:orientation="horizontal" >

            <RadioButton

                android:id="@+id/rb_first"

                android:layout_width="match_parent"

                android:layout_height="match_parent"

                android:layout_weight="1"

                android:background="@android:color/holo_blue_light"

                android:text="1号" />

            <RadioButton

                android:id="@+id/rb_second"

                android:layout_width="match_parent"

                android:layout_height="match_parent"

                android:layout_weight="1"

                android:background="@android:color/holo_green_light"

                android:text="2号" />

            <RadioButton

                android:id="@+id/rb_third"

                android:layout_width="match_parent"

                android:layout_height="match_parent"

                android:layout_weight="1"

                android:background="@android:color/holo_blue_light"

                android:text="3号" />

            <RadioButton

                android:id="@+id/rb_fourth"

                android:layout_width="match_parent"

                android:layout_height="match_parent"

                android:layout_weight="1"

                android:background="@android:color/holo_green_light"

                android:text="4号" />

        </RadioGroup>

    </LinearLayout>

</LinearLayout>

view_first.xml

<?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" >

    <!-- @author Arthur Lee -->

    <TextView

        android:id="@+id/view_first"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="第一页面"

        android:textSize="20sp" />

</LinearLayout>

这一类的其他三个布局文件似。它不再可用。

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