initview1.布局<?xml version=

1.布局

<?xml version="1.0" encoding="utf-8"?>

《LinearLayout

xmlns:android=“”

xmlns:app=“”

xmlns:tools=“”

android:layout_width=“match_parent”

android:layout_height=“match_parent”

tools:context=".view.activity.MainActivity"

android:orientation=“vertical”

》

《android.support.v4.view.ViewPager

android:layout_width=“match_parent”

android:layout_height=“0dp”

android:layout_weight=“9”

android:id="@+id/viewpager"

/ 》

《RadioGroup

android:layout_width=“match_parent”

android:layout_height=“0dp”

android:layout_weight=“1”

android:id="@+id/group"

android:orientation=“horizontal”

》

《RadioButton

android:layout_width=“0dp”

android:layout_weight=“1”

android:layout_height=“match_parent”

android:button="@null"

android:id="@+id/r1"

android:gravity=“center”

android:background="@drawable/sel_r"

/ 》

《RadioButton

android:layout_width=“0dp”

android:layout_weight=“1”

android:layout_height=“match_parent”

android:text=“购物车”

android:button="@null"

android:id="@+id/r2"

android:gravity=“center”

android:background="@drawable/sel_r"

/ 》

《RadioButton

android:gravity=“center”

android:layout_width=“0dp”

android:layout_weight=“1”

android:layout_height=“match_parent”

android:text=“我的”

android:button="@null"

android:id="@+id/r3"

android:background="@drawable/sel_r"

/》

《/RadioGroup》

《/LinearLayout》

2 BaseActivity

public class mainactivity extends appcompatactivity implements sensoreventlistener {。public class mainactivity extends appcompatactivity。public class tryopencv2activity extends appcompatactivity {。public class secoundactivity extends appcompatactivity {。

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(getView());

initView();

initDate();

showView();

}

public abstract int getView();

public abstract void initView();

public abstract void initDate();

public abstract void showView();

}

3MainActivity

public class activitysingletask extends baseactivity {。public class activitysingleinstance extends baseactivity {。

//使用ButterKnife前请观看之前的博客导入相关的依赖

@BindView(R.id.viewpager)

ViewPager viewPager;

@BindView(R.id.group)

RadioGroup radioGroup;

private ArrayList《Fragment》 list;

private One one;

private Two two;

private Three three;

private Unbinder unbinder;

@Override

public int getView() {

return R.layout.activity_main;

}

@Override

public void initView() {

unbinder = ButterKnife.bind(this);

}

@Override

public void initDate() {

list = new ArrayList<>();

//此时请创建3个Fragment

one = new One();

two = new Two();

three = new Three();

list.add(one);

list.add(two);

list.add(three);

}

@Override

public void showView() {

viewPager.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {

@Override

public Fragment getItem(int i) {

return list.get(i);

}

@Override

public int getCount() {

return list.size();

}

});

radioGroup.check(radioGroup.getChildAt(0).getId());

但是从“mismatched free() / delete / delete []”知道valgrind实际上是不允许这样操作的，虽然没有内存泄露问题，但是new[]与delete不匹配，这样的编程风格不经意间就容易犯低级错误，所以valgrind报错了，但是我想valgrind内部实现应该不会考虑的这么复杂，它就检查new是否与delete配对，new[]是否与delete[]配对，而不管有时候new[]与delete配对也不会出现问题的。private viewpager.onpagechangelistener getonpagechangelistener(viewpager pager) {。之前做过一个viewpager嵌套页面：可上下滑动的layout中嵌套一个自定义的viewpager,viewpager中嵌套flowlayout。viewpager = (viewpager) findviewbyid(r.id.viewpager)。

@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) {

}

});

radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {

@Override

public void onCheckedChanged(RadioGroup group, int checkedId) {

switch (checkedId){

viewpager = (viewpager) findviewbyid(r.id.pager)。 mviewpager = (viewpager) findviewbyid(r.id.pager_splash_ad)。

case R.id.r2: viewPager.setCurrentItem(1);break;

case R.id.r3: viewPager.setCurrentItem(2);break;

}

}

});

}

@Override

protected void onDestroy() {

super.onDestroy();

unbinder.unbind();

}

}

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