海词之Fragment+ViewPager

来源：互联网发布：淘宝菜筛编辑：程序博客网时间：2024/04/28 20:10

由于本人很喜欢用海词来翻译日常不懂的单词，所以我打算用自己所学的知识仿照着海词词典的APP。
这里写图片描述
今天我主要是仿照着写出一个来，内容没有这个丰富，只是简单的实现了Fragment+ViewPager，具体的还没有时间去弄~~~~

以下是布局的代码

<android.support.v4.view.ViewPager        android:id="@+id/viewpager"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_above="@+id/radioGroup" />    <RadioGroup        android:id="@+id/radioGroup"        android:layout_width="match_parent"        android:layout_height="55dp"        android:layout_alignParentBottom="true"        android:orientation="horizontal" >        <RadioButton            android:id="@+id/rb_dictionary"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:layout_weight="1"            android:button="@null"            android:drawableTop="@drawable/rb_dictionary"            android:checked="true"            android:onClick="BottomOnClickListen"            android:paddingTop="10dp" />        <RadioButton            android:id="@+id/rb_discovery"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:layout_weight="1"            android:button="@null"            android:drawableTop="@drawable/rb_discovery"            android:onClick="BottomOnClickListen"            android:paddingTop="10dp" />        <RadioButton            android:id="@+id/rb_memo"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:layout_weight="1"            android:button="@null"            android:drawableTop="@drawable/rb_memo"            android:onClick="BottomOnClickListen"            android:paddingTop="10dp" />        <RadioButton            android:id="@+id/rb_mine"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:layout_weight="1"            android:button="@null"            android:drawableTop="@drawable/rb_mine"            android:onClick="BottomOnClickListen"            android:paddingTop="10dp" />    </RadioGroup>

在这里要注意的是android:drawableTop 引用的是

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android" >    <item android:state_checked="true" android:drawable="@drawable/radio_memo_p"></item>    <item android:state_checked="false" android:drawable="@drawable/radio_memo_n"></item></selector>

接下来是MainActivity

package com.even.Activity;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.app.FragmentManager;import android.support.v4.app.FragmentPagerAdapter;import android.support.v4.view.ViewPager;import android.support.v4.view.ViewPager.OnPageChangeListener;import android.util.Log;import android.view.View;import android.widget.RadioButton;import android.widget.Toast;public class MainActivity extends FragmentActivity {    private ViewPager mViewPager;    private RadioButton mDictionary;    private RadioButton mDiscovery;    private RadioButton mMemo;    private RadioButton mMine;    //自定义Adapter    private FragmentAdapter mFragmentAdapter;    private List<Fragment> list;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_mian);        init();//初始化        //给mViewPager加监听        mViewPager.setOnPageChangeListener(listener);        //创建包含4个Fragment的List        list = new ArrayList<Fragment>();        list.add(new Fragment());        list.add(new Fragment());        list.add(new Fragment());        list.add(new Fragment());        mFragmentAdapter = new FragmentAdapter(getSupportFragmentManager());        //关联Adapter        mViewPager.setAdapter(mFragmentAdapter);    }    private OnPageChangeListener listener = new OnPageChangeListener() {        //此方法是页面跳转完成时调用，position是你当前选中的页面        @Override        public void onPageSelected(int position) {            switch (position) {            case 0:                mDictionary.setChecked(true);                break;            case 1:                mDiscovery.setChecked(true);                break;            case 2:                mMemo.setChecked(true);                break;            case 3:                mMine.setChecked(true);                break;            }        }        //当页面在滑动时会一直调用        @Override        public void onPageScrolled(int arg0, float arg1, int arg2) {        }        /*此方法是状态改变的时候调用，其中arg0有3中状态，分别是（0，1，2）            arg0==0 :表示什么都没有做            arg0==1 :表示正在滑动            arg0==2 :表示滑动完成        */        @Override        public void onPageScrollStateChanged(int arg0) {        }    };    /** 初始化控件 */    private void init() {        mViewPager = (ViewPager) findViewById(R.id.viewpager);        mDictionary = (RadioButton) findViewById(R.id.rb_dictionary);        mDiscovery = (RadioButton) findViewById(R.id.rb_discovery);        mMemo = (RadioButton) findViewById(R.id.rb_memo);        mMine = (RadioButton) findViewById(R.id.rb_mine);    }    /** RadioButton 的监听 */    public void BottomOnClickListen(View view) {        switch (view.getId()) {        case R.id.rb_dictionary:            mViewPager.setCurrentItem(0);            break;        case R.id.rb_discovery:            mViewPager.setCurrentItem(1);            break;        case R.id.rb_memo:            mViewPager.setCurrentItem(2);            break;        case R.id.rb_mine:            mViewPager.setCurrentItem(3);            break;        }    }    class FragmentAdapter extends FragmentPagerAdapter {        public FragmentAdapter(FragmentManager fm) {            super(fm);        }        //某一位置的数据        @Override        public Fragment getItem(int position) {            return list.get(position);        }        //获得数据的长度        @Override        public int getCount() {            return list.size();        }    }}

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