基于Android的计步器(Pedometer)的讲解(一)——Fragment页面跳转 – Android移动开发技术文章_手机开发 – 红黑联盟

首先需要做的是实现几个页面的跳转，既类似微信的点击按钮，切换页面。

话不多说，这是一个简单的页面切换的Demo，先贴几张实现的效果：

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图片的底部是5个RadioButton，用来进行页面之间的切换。剩下的部分是一个LinearLayout的布局，用来镶嵌5个Fragment（碎片）的页面。

一共用到5个类：MainActivity、MyAdapter、FragmentHistory、FragmentAnalysis、FragmentPedometer、FragmentPK、FragmentSet

MainActivity的主要代码如下：

 

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package com.example.changepage1;
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.widget.RadioGroup;
public class MainActivity extends FragmentActivity {
    private RadioGroup rg;
    private List<fragment> fragments;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.page_mian);
        rg = (RadioGroup) findViewById(R.id.radioGroup);//实例化radiogroup
        fragments = new ArrayList<fragment>();
        //分别添加5个fragment
        fragments.add(new FragmentHistory());
        fragments.add(new FragmentAnalysis());
        fragments.add(new FragmentPedometer());
        fragments.add(new FragmentPK());
        fragments.add(new FragmentSet());
        new MyAdapter(this, fragments, R.id.Fragment, rg);//设置适配器
    }
}</fragment></fragment>

 

MyAdapter的代码如下：

 

 

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package com.example.changepage1;
import java.util.List;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
/**
 * 这是自己写的一个适配器
 *
 * @author 李垭超 Date: 2015-1-2 Time: 下午3点
 */
public class MyAdapter implements OnCheckedChangeListener {
    private List<fragment> fragments; // 一个tab页面对应一个Fragment
    private RadioGroup rgs; // 用于切换tab
    private FragmentActivity fragmentActivity; // Fragment所属的Activity
    private int fragmentContentId; // Activity中所要被替换的区域的id
    private int currentTab = 2; // 当前Tab页面索引
    public MyAdapter(FragmentActivity fragmentActivity,
            List<fragment> fragments, int fragmentContentId, RadioGroup rgs) {
        this.fragments = fragments;
        this.rgs = rgs;
        this.fragmentActivity = fragmentActivity;
        this.fragmentContentId = fragmentContentId;
        // 默认显示第一页
        FragmentTransaction ft = fragmentActivity.getSupportFragmentManager()
                .beginTransaction();
        ft.add(fragmentContentId, fragments.get(2));
        ft.commit();
        this.rgs.setOnCheckedChangeListener(this);
    }
    /**
     * 监听radiobutton改变时间，当选择了不同的radiobutton会出发这个函数
     */
    public void onCheckedChanged(RadioGroup group, int checkedId) {
        for (int i = 0; i < rgs.getChildCount(); i++) {
            if (rgs.getChildAt(i).getId() == checkedId) {
                Fragment fragment = fragments.get(i);
                FragmentTransaction ft = obtainFragmentTransaction(i);
                getCurrentFragment().onPause(); // 暂停当前tab
                if (fragment.isAdded()) {
                    fragment.onResume(); // 启动目标tab的onResume()
                } else {
                    ft.add(fragmentContentId, fragment);
                }
                showTab(i); // 显示目标tab
                ft.commit();
                
            }
        }
    }
    public Fragment getCurrentFragment() {
        return fragments.get(currentTab);
    }
    private void showTab(int idx) {
        for (int i = 0; i < fragments.size(); i++) {
            Fragment fragment = fragments.get(i);
            FragmentTransaction ft = obtainFragmentTransaction(idx);
            if (idx == i) {
                ft.show(fragment);
            } else {
                ft.hide(fragment);
            }
            ft.commit();
        }
        currentTab = idx; // 更新目标tab为当前tab
    }
    private FragmentTransaction obtainFragmentTransaction(int index) {
        FragmentTransaction ft = fragmentActivity.getSupportFragmentManager()
                .beginTransaction();
        // 设置切换动画
        if (index > currentTab) {
            ft.setCustomAnimations(R.anim.slide_left_in, R.anim.slide_left_out);
        } else {
            ft.setCustomAnimations(R.anim.slide_right_in,
                    R.anim.slide_right_out);
        }
        return ft;
    }
}</fragment></fragment>

 

FragmentHistory、FragmentAnalysis、FragmentPedometer、FragmentPK、FragmentSet的代码依次为：

 

 

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package com.example.changepage1;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
 * 这是分析七天步数的碎片
 * Author: 李垭超   email:296777513@qq.com
 * Date: 2015-1-2
 * Time: 下午2:39
 */
public class FragmentAnalysis extends Fragment{
    private View view;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        view = inflater.inflate(R.layout.analysis, container, false);
        return view;
    }
}

 

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package com.example.changepage1;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
 * 这是历史记录的碎片
 * Author: 李垭超   email:296777513@qq.com
 * Date: 2015-1-2
 * Time: 下午2:39
 */
public class FragmentHistory extends Fragment{
    private View view;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        view = inflater.inflate(R.layout.history, container, false);
        return view;
    }
}

 

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package com.example.changepage1;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
 * 这是记步的碎片
 * Author: 李垭超   email:296777513@qq.com
 * Date: 2015-1-2
 * Time: 下午2:39
 */
public class FragmentPedometer extends Fragment{
    private View view;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        view = inflater.inflate(R.layout.pedometer, container, false);
        return view;
    }
}

 

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package com.example.changepage1;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
 * 这是记步的碎片
 * Author: 李垭超   email:296777513@qq.com
 * Date: 2015-1-2
 * Time: 下午2:39
 */
public class FragmentPK extends Fragment{
    private View view;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        view = inflater.inflate(R.layout.pk, container, false);
        return view;
    }
}

 

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package com.example.changepage1;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
 * 这是设置的碎片
 * Author: 李垭超   email:296777513@qq.com
 * Date: 2015-1-2
 * Time: 下午2:39
 */
public class FragmentSet extends Fragment{
    private View view;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        view = inflater.inflate(R.layout.set, container, false);
        return view;
    }
}

 

 

 

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基于Android的计步器(Pedometer)的讲解(五)——跟随界面滑动的指示器 – Android移动开发技术文章_手机开发 – 红黑联盟

 

 

来源URL：http://www.2cto.com/kf/201501/366420.html