海詞之Fragment+ViewPager

由於本人很喜歡用海詞來翻譯日常不懂的單詞，所以我打算用自己所學的知識仿照着海詞詞典的APP。

今天我主要是仿照着寫出一個來，內容沒有這個豐富，只是簡單的實現了Fragment+ViewPager，具體的還沒有時間去弄~~~~

以下是佈局的代碼

<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>

在這裏要注意的是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>

接下來是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;
    //自定義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
        //給mViewPager加監聽
        mViewPager.setOnPageChangeListener(listener);
        //創建包含4個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());
        //關聯Adapter
        mViewPager.setAdapter(mFragmentAdapter);
    }

    private OnPageChangeListener listener = new OnPageChangeListener() {
        //此方法是頁面跳轉完成時調用，position是你當前選中的頁面
        @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;
            }
        }
        //當頁面在滑動時會一直調用
        @Override
        public void onPageScrolled(int arg0, float arg1, int arg2) {
        }
        /*此方法是狀態改變的時候調用，其中arg0有3中狀態，分別是（0，1，2）
            arg0==0 :表示什麼都沒有做
            arg0==1 :表示正在滑動
            arg0==2 :表示滑動完成
        */
        @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 的監聽 */
    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);
        }
        //某一位置的數據
        @Override
        public Fragment getItem(int position) {
            return list.get(position);
        }
        //獲得數據的長度
        @Override
        public int getCount() {
            return list.size();
        }
    }
}