//布局文件 小圆点用shape写的
<android.support.v4.view.ViewPager
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<RadioGroup
android:id="@+id/radiogroup"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:gravity="center"
android:orientation="horizontal">
<RadioButton
android:id="@+id/radio1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:button="@null"
android:checked="true"
android:drawableTop="@drawable/sle_r" />
<RadioButton
android:id="@+id/radio2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:button="@null"
android:drawableTop="@drawable/sle_r" />
<RadioButton
android:id="@+id/radio3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:button="@null"
android:drawableTop="@drawable/sle_r" />
</RadioGroup>
//建三个fragment里面有三个图片的布局
//在Java中
public class MainActivity extends AppCompatActivity {
private ViewPager pager;
private RadioGroup group;
private ArrayList<Fragment> fragments;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//找控件
pager = (ViewPager) findViewById(R.id.pager);
group = (RadioGroup) findViewById(R.id.radiogroup);
//创建fragment集合
fragments = new ArrayList<>();
fragments.add(new Fragment1());
fragments.add(new Fragment2());
fragments.add(new Fragment3());
//设置监听
pager.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {
@Override
public Fragment getItem(int i) {
return fragments.get(i);
}
@Override
public int getCount() {
return fragments.size();
}
});
//设置viewpager监听
pager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int i, float v, int i1) {
}
@Override
public void onPageSelected(int i) {
group.check(group.getChildAt(i).getId());
}
@Override
public void onPageScrollStateChanged(int i) {
}
});
//点击按钮
group.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
switch (checkedId) {
case R.id.radio1:
pager.setCurrentItem(0);
break;
case R.id.radio2:
pager.setCurrentItem(1);
break;
case R.id.radio3:
pager.setCurrentItem(2);
break;
}
}
});
}
}