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

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 mList;

  public MyViewPagerAdpter(List 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

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 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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