Android ViewPager与radiogroup实现关联示例

Android ViewPager与radiogroup实现关联

效果图展示

Android ViewPager与radiogroup实现关联步骤

1.实例化ViewPager

2.通过LayoutInflater加载布局，返回View结果

3.把生成的每一个View对象添加到List集合中

4.实例化适配器，传递View集合

5.在适配器中继承自PagerAdapter，实现内部的四个方法

getCount(); 返回视图的数量 isViewFromObject(); 是否通过对象加载视图 View==object instantiateltem(); 加载当前页面(通过container.addView();添加视图)返回个给用户 destroyItem(); 销毁滑出的视图(通过container.removerView();销毁视图)

6.实例化每个RadioButton

7.点击每个RaidoButton时，切换不同的页面(viewPager.setCurrentltem(下标))

8.当页面切换后，还要把当前的导航栏变为绿色

设置文本颜色的setTextColor(getResources().getColor(R.color.tvGreen)); 设置文本的上方的图片的，四个参数分别为，左、上、右、下setCompoundDrawablesWithIntrinsicBounds (null,getResources().getDrawable）(R.drawable.call_t),null,null);

9.当你每次点击之前的时候，添加一个方法，清除方法，（清理之 前的所有导航栏的状态，置为灰色）

10.实现滑动监听需要addOnPagerChangeListener

11.在onPagerSelected方法中，根据position页面的下标判断分别设置对应的底部导航栏状态

代码演示

1.在主布局文件中引入android-support-v4.jar包并添加RadioGroup并在RadioGroup中添加RadioButton用于显示导航栏

 <?xml version="1.0" encoding="utf-8"?>
<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="com.example.cxy.viewpager.MainActivity">
  <android.support.v4.view.ViewPager
    android:id="@+id/viewPager"
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="9">
  </android.support.v4.view.ViewPager>
  <RadioGroup
    android:id="@+id/radioGroup"
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="1"
    android:background="#F4F3F3"
    android:orientation="horizontal">
    <RadioButton
      android:id="@+id/radioButton1"
      android:layout_width="0dp"
      android:layout_height="match_parent"
      android:layout_weight="1"
      android:button="@null"
      android:drawableTop="@drawable/mess_t"
      android:gravity="center"
      android:text="微信"
      android:textColor="#11CD6E"/>
    <RadioButton
      android:id="@+id/radioButton2"
      android:layout_width="0dp"
      android:layout_height="match_parent"
      android:layout_weight="1"
      android:button="@null"
      android:drawableTop="@drawable/call_f"
      android:gravity="center"
      android:text="通讯录"
      android:textColor="@android:color/darker_gray"/>
    <RadioButton
      android:id="@+id/radioButton3"
      android:layout_width="0dp"
      android:layout_height="match_parent"
      android:layout_weight="1"
      android:button="@null"
      android:drawableTop="@drawable/show_f"
      android:gravity="center"
      android:text="发现"
      android:textColor="@android:color/darker_gray"/>
    <RadioButton
      android:id="@+id/radioButton4"
      android:layout_width="0dp"
      android:layout_height="match_parent"
      android:layout_weight="1"
      android:button="@null"
      android:drawableTop="@drawable/my"
      android:gravity="center"
      android:text="我"
      android:textColor="@android:color/darker_gray"/>
  </RadioGroup>
</LinearLayout>

2.ViewPager需要适配器继承于PagerAdapter

 package com.example.cxy.viewpager.adapter;
import android.support.v4.view.PagerAdapter;
import android.view.View;
import android.view.ViewGroup;
import java.util.List;

public class MyViewPagerAdpter extends PagerAdapter {
  private List<View> mList;
  public MyViewPagerAdpter(List<View> list) {
    mList = list;
  }
  //返回视图数量
  @Override
  public int getCount() {
    return mList.size();
  }
  //是否通过对象加载视图
  @Override
  public boolean isViewFromObject(View view, Object object) {
    return view == object;
  }
  //加载当前页面
  @Override
  public Object instantiateItem(ViewGroup container, int position) {
    container.addView(mList.get(position));
    return mList.get(position);//View
  }
  //销毁滑出视图
  @Override
  public void destroyItem(ViewGroup container, int position, Object object) {
    container.removeView(mList.get(position));
  }
}

3.新建一个fragment包，在包中新建OneFragment类用于滑动展示，新建布局文件fragmentone.xml并添加TextView用于添加不同页面的内容，共有四个这里只写一个

OneFragment类

package com.example.cxy.viewpager.fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.example.cxy.viewpager.R;

public class OneFragment extends Fragment{
  @Nullable
  @Override
  public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragmentone, null);
    return view;
  }
}

fragmentone.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">
  <TextView
    android:textSize="30sp"
    android:id="@+id/textView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:text="这是微信页面"/>
</LinearLayout>

4.编写主类

package com.example.cxy.viewpager;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import com.example.cxy.viewpager.adapter.MyViewPagerAdpter;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity implements RadioGroup.OnCheckedChangeListener, ViewPager.OnPageChangeListener {
  private ViewPager mViewPager;
  private List<View> mList;
  private RadioGroup mRadioGroup;
  private RadioButton weChatBtn, msgBtn, showBtn, myBtn;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //初始化所有控件
    initView();
  }
  private void initView() {
    //实例化ViewPager
    mViewPager = (ViewPager) findViewById(R.id.viewPager);
    //实例化Radiogroup
    mRadioGroup = (RadioGroup) findViewById(R.id.radioGroup);
    //给RadioGroup添加监听
    mRadioGroup.setOnCheckedChangeListener(this);
    //实例化RadioButton
    weChatBtn = (RadioButton) findViewById(R.id.radioButton1);
    msgBtn = (RadioButton) findViewById(R.id.radioButton2);
    showBtn = (RadioButton) findViewById(R.id.radioButton3);
    myBtn = (RadioButton) findViewById(R.id.radioButton4);
    //实例化List数组
    mList = new ArrayList<>();
    View view1 = LayoutInflater.from(this).inflate(R.layout.fragmentone, null);
    View view2 = LayoutInflater.from(this).inflate(R.layout.fragmenttwo, null);
    View view3 = LayoutInflater.from(this).inflate(R.layout.fragmentthree, null);
    View view4 = LayoutInflater.from(this).inflate(R.layout.fragmentfour, null);
    //把生成的每一个View对象添加到集合中
    mList.add(view1);
    mList.add(view2);
    mList.add(view3);
    mList.add(view4);
    //实例化适配器
    MyViewPagerAdpter adapter = new MyViewPagerAdpter(mList);
    //给ViewPager添加适配器
    mViewPager.setAdapter(adapter);
    //给ViewPager添加监听事件
    mViewPager.addOnPageChangeListener(this);
  }
  @Override
  public void onCheckedChanged(RadioGroup group, int checkedId) {
    //清理所有导航栏的状态
    clearState();
    switch (checkedId) {
      case R.id.radioButton1:
        //给ViewPager设置当前布局
        mViewPager.setCurrentItem(0);
        //给RadioButton设置文本颜色
        weChatBtn.setTextColor(getResources().getColor(R.color.tvGreen));
        //给RadioButton设置文本上方的图片
        weChatBtn.setCompoundDrawablesWithIntrinsicBounds(null, getResources().getDrawable(R.drawable.mess_t), null, null);
        break;
      case R.id.radioButton2:
        mViewPager.setCurrentItem(1);
        msgBtn.setTextColor(getResources().getColor(R.color.tvGreen));
        msgBtn.setCompoundDrawablesWithIntrinsicBounds(null, getResources().getDrawable(R.drawable.call_t), null, null);
        break;
      case R.id.radioButton3:
        mViewPager.setCurrentItem(2);
        showBtn.setTextColor(getResources().getColor(R.color.tvGreen));
        showBtn.setCompoundDrawablesWithIntrinsicBounds(null, getResources().getDrawable(R.drawable.show_t), null, null);
        break;
      case R.id.radioButton4:
        mViewPager.setCurrentItem(3);
        myBtn.setTextColor(getResources().getColor(R.color.tvGreen));
        myBtn.setCompoundDrawablesWithIntrinsicBounds(null, getResources().getDrawable(R.drawable.my_t), null, null);
        break;
    }
  }
  //初始化底部导航栏
  private void clearState() {
    weChatBtn.setTextColor(getResources().getColor(android.R.color.darker_gray));
    msgBtn.setTextColor(getResources().getColor(android.R.color.darker_gray));
    showBtn.setTextColor(getResources().getColor(android.R.color.darker_gray));
    myBtn.setTextColor(getResources().getColor(android.R.color.darker_gray));
    weChatBtn.setCompoundDrawablesWithIntrinsicBounds(null, getResources().getDrawable(R.drawable.mess_f), null, null);
    msgBtn.setCompoundDrawablesWithIntrinsicBounds(null, getResources().getDrawable(R.drawable.call_f), null, null);
    showBtn.setCompoundDrawablesWithIntrinsicBounds(null, getResources().getDrawable(R.drawable.show_f), null, null);
    myBtn.setCompoundDrawablesWithIntrinsicBounds(null, getResources().getDrawable(R.drawable.my), null, null);
  }
  //滑动过程中的动作
  @Override
  public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
  }
  //选择某个页面松手后会被调用
  @Override
  public void onPageSelected(int position) {
    //清理所有导航栏的状态
    clearState();
    switch (position) {
      //使用Switch拿到下标定义当滑动到相应位置小点显示颜色
      case 0:
        //当页面切换后，还要把当前的导航栏变为绿色
        weChatBtn.setTextColor(getResources().getColor(R.color.tvGreen));
        //设置文本的上方的图片的，四个参数分别为，左、上、右、下
        weChatBtn.setCompoundDrawablesWithIntrinsicBounds(null, getResources().getDrawable(R.drawable.mess_t), null, null);
        break;
      case 1:
        msgBtn.setTextColor(getResources().getColor(R.color.tvGreen));
        msgBtn.setCompoundDrawablesWithIntrinsicBounds(null, getResources().getDrawable(R.drawable.call_t), null, null);
        break;
      case 2:
        showBtn.setTextColor(getResources().getColor(R.color.tvGreen));
        showBtn.setCompoundDrawablesWithIntrinsicBounds(null, getResources().getDrawable(R.drawable.show_t), null, null);
        break;
      case 3:
        myBtn.setTextColor(getResources().getColor(R.color.tvGreen));
        myBtn.setCompoundDrawablesWithIntrinsicBounds(null, getResources().getDrawable(R.drawable.my_t), null, null);
        break;
    }
  }
  //手指放上去，松开，拖动都会被调用
  @Override
  public void onPageScrollStateChanged(int state) {
  }
}

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