如何在Android项目中使用ViewPager对radiogroup进行关联
如何在Android项目中使用ViewPager对radiogroup进行关联?针对这个问题,这篇文章详细介绍了相对应的分析和解答,希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。
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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; /** * date:2017/3/7 * Created:陈箫阳(admin) */ public class MyViewPagerAdpter extends PagerAdapter { private ListmList; 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; /** * date:2017/3/7 * Created:陈箫阳(admin) */ 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 ListmList; 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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标题名称:如何在Android项目中使用ViewPager对radiogroup进行关联
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