首先布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<android.support.v4.view.ViewPager
android:id="@+id/vp"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"/>
<RadioGroup
android:id="@+id/radioG"
android:layout_width="match_parent"
android:orientation="horizontal"
android:layout_height="wrap_content">
<RadioButton
android:id="@+id/rb1"
android:button="@null"
android:drawableTop="@drawable/sel"
android:layout_width="0dp"
android:checked="true"
android:gravity="center"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="111"/>
<RadioButton
android:id="@+id/rb2"
android:button="@null"
android:gravity="center"
android:drawableTop="@drawable/sel"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="222"/>
<RadioButton
android:id="@+id/rb3"
android:button="@null"
android:drawableTop="@drawable/sel"
android:layout_width="0dp"
android:gravity="center"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="333"/>
</RadioGroup>
</LinearLayout>
package com.example.day4_2;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.RadioGroup;
import com.example.day4_2.frag.Frag01;
import com.example.day4_2.frag.Frag02;
import com.example.day4_2.frag.Frag03;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
private ViewPager pager;
private RadioGroup radioGroup;
private ArrayList<Fragment> list;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
pager=findViewById(R.id.vp);
radioGroup=findViewById(R.id.radioG);
//页面数据
list=new ArrayList<>();
list.add(new Frag01());
list.add(new Frag02());
list.add(new Frag03());
//view pager 适配器
pager.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {
@Override
public Fragment getItem(int i) {
return list.get(i);
}
@Override
public int getCount() {
return list.size();
}
});
///滑动的时候切换按钮选中状态
pager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int i, float v, int i1) {
}
@Override
public void onPageSelected(int i) {
radioGroup.check(radioGroup.getChildAt(i).getId());
}
@Override
public void onPageScrollStateChanged(int i) {
}
});
//点击按钮切换
radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
switch (checkedId){
case R.id.rb1:
pager.setCurrentItem(0);
break;
case R.id.rb2:
pager.setCurrentItem(1);
break;
case R.id.rb3:
pager.setCurrentItem(2);
break;
}
}
});
}
}