版权声明:叮叮叮!!!! https://blog.csdn.net/Xuexx_520/article/details/83277619
MainActivity
package com.example.xxx.day15_baseactivity;
import android.app.Fragment;
import android.support.design.widget.TabLayout;
import android.support.v4.view.ViewPager;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
private ViewPager viewPager;
private ArrayList<Fragment> list;
private FragmentAdapter adapter;
private TabLayout tabs;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//查找控件
viewPager=findViewById(R.id.viewpager);
list=new ArrayList<>();
list.add(new AFragment());
list.add(new BFragment());
list.add(new AFragment());
//添加适配
adapter=new FragmentAdapter(getFragmentManager(),list);
viewPager.setAdapter(adapter);
//初始化Tab
tabs=findViewById(R.id.tabs);
tabs.addTab(tabs.newTab());
tabs.addTab(tabs.newTab());
tabs.addTab(tabs.newTab());
tabs.setupWithViewPager(viewPager);
tabs.getTabAt(0).setText("页面1");
tabs.getTabAt(1).setText("页面2");
tabs.getTabAt(2).setText("页面3");
}
}
在BFragment设置自动轮播,并且handler发送消息实现2秒切换图片,再设置viewpager监听触摸状态
package com.example.xxx.day15_baseactivity;
import android.app.Fragment;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.annotation.NonNull;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import java.util.ArrayList;
/**
* A simple {@link Fragment} subclass.
*/
public class BFragment extends Fragment {
private ViewPager b_viewpager;
private ArrayList<Integer> list;
private Madapter ma;
Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
int x = b_viewpager.getCurrentItem();
x++;
b_viewpager.setCurrentItem(x);
send();
}
};
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view=inflater.inflate(R.layout.fragment_b, container, false);
b_viewpager=view.findViewById(R.id.b_viewpager);
list=new ArrayList<>();
list.add(R.drawable.a);
list.add(R.drawable.b);
list.add(R.drawable.c);
ma=new Madapter();
b_viewpager.setAdapter(ma);
//监听图片触摸状态
b_viewpager.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
switch(motionEvent.getAction()){
case MotionEvent.ACTION_DOWN:
handler.removeMessages(1);
break;
case MotionEvent.ACTION_MOVE:
handler.removeMessages(1);
break;
case MotionEvent.ACTION_UP:
send();
break;
}
return false;
}
});
return view;
}
//图片轮播适配
class Madapter extends PagerAdapter{
@Override
public int getCount() {
return Integer.MAX_VALUE;
}
@Override
public boolean isViewFromObject(@NonNull View view, @NonNull Object o) {
return view==o;
}
@NonNull
@Override
public Object instantiateItem(@NonNull ViewGroup container, int position) {
ImageView imageView=new ImageView(getActivity());
imageView.setImageResource(list.get(position%list.size()));
container.addView(imageView);
return imageView;
}
@Override
public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
container.removeView((View) object);
}
}
//按Home停止发送
@Override
public void onPause() {
super.onPause();
handler.removeMessages(1);
}
/*
@Override
public void onResume() {
super.onResume();
send();
}*/
public void send(){
if (ma != null && ma.getCount()>0){
//handler.removeMessages(1);
handler.sendEmptyMessageDelayed(1,2000);
}
}
//当滑动到当前fragment时继续发送消息
@Override
public void setUserVisibleHint(boolean isVisibleToUser) {
super.setUserVisibleHint(isVisibleToUser);
if(isVisibleToUser) {
send();
} else {
handler.removeMessages(1);
}
}
}
分发拦截
BBFragment继承frameLayout重写分发拦截方法
package com.example.xxx.day15_baseactivity;
import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.FrameLayout;
public class BBFragment extends FrameLayout {
public BBFragment(Context context,AttributeSet attrs) {
super(context, attrs);
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
return super.dispatchTouchEvent(ev);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
return super.onTouchEvent(event);
}
}
MViewpager继承ViewPager重写分发拦截方法
package com.example.xxx.day15_baseactivity;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;
public class MViewPager extends ViewPager {
int x=0;
int x1=0;
public MViewPager(@NonNull Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
int currentItem=this.getCurrentItem();
//第一张图
if(currentItem%3==0){
boolean flag=set(ev,currentItem);
return flag;
} else if(currentItem%3==2){//最后一张图
boolean flag=set(ev,currentItem);
return flag;
} else {
boolean flag=set(ev,currentItem);
return flag;
}
}
private boolean set(MotionEvent ev, int currentItem) {
int action=ev.getAction();
//滑动前开始位置
if(action==MotionEvent.ACTION_DOWN){
x= (int) ev.getX();
}
//滑动到的位置
if (action == MotionEvent.ACTION_MOVE){
x1 = (int)ev.getX();
}
//第一张图片滑动完毕
if(currentItem%3==0&&x1-x>0){
return false;
}
//最后一张图片滑动完毕
if(currentItem%3==2&&x1-x<0){
return false;
}
return super.onTouchEvent(ev);
}
}
布局
<?xml version="1.0" encoding="utf-8"?>
<com.example.xxx.day15_baseactivity.BBFragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".BFragment">
<!-- TODO: Update blank fragment layout -->
<com.example.xxx.day15_baseactivity.MViewPager
android:id="@+id/b_viewpager"
android:layout_width="match_parent"
android:layout_height="200dp">
</com.example.xxx.day15_baseactivity.MViewPager>
</com.example.xxx.day15_baseactivity.BBFragment>