在模拟器上显示效果大概如下:
大概思路和代码如下:
1、首先创建一个layout布局文件,
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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=".ViewPagerFragmentActivity">
<!--实现滑动布局的控件-->
<android.support.v4.view.ViewPager
android:id="@+id/myViewPager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<!--根据显示页面显示不同小圆点的控件-->
<LinearLayout
android:id="@+id/dot_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="40dip"
android:gravity="center"
android:orientation="horizontal"></LinearLayout>
</RelativeLayout>
2、创建四个布局文件,一个布局文件一张图片
我这里四个布局文件名称,以便下面好理解:fmain.xml、fphone.xml、ffriend.xml、fme.xml。
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!--第一张图片-->
<ImageView
android:id="@+id/bookapp1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="fitXY"
android:src="@drawable/bookapp1" />
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<!--第二张图片-->
<ImageView
android:id="@+id/bookapp2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="fitXY"
android:src="@drawable/bookapp2" />
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<!--第三张图片-->
<ImageView
android:id="@+id/bookapp3"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="fitXY"
android:src="@drawable/bookapp3" />
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<!--第四张图片-->
<ImageView
android:id="@+id/bookapp4"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="fitXY"
android:src="@drawable/bookapp4" />
<Button
android:layout_width="200dp"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="107dp"
android:background="#80ecebeb"
android:text="立即体验"
android:textSize="20dp"/>
</RelativeLayout>
3、然后创建四个相对应的JAVA类,继承Fragment,
四个JAVA类名跟布局文件名一致,fmain.java、fphone.java、ffriend.java、fme.java。
package main;
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 android.widget.ImageView;
import zking.com.android7.R;
/**
* 第一个页面的Fragment的JAVA类
*/
public class Fmain extends Fragment {
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fmain, null);
//得到第一张图片的控件对象
ImageView bookapp1 = v.findViewById(R.id.bookapp1);
return v;
}
}
package main;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import zking.com.android7.R;
/**
* 第二个页面的Fragment的JAVA类
*/
public class Fphone extends Fragment {
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fphone, null);
//得到第二张图片的控件对象
ImageView bookapp2 = v.findViewById(R.id.bookapp2);
return v;
}
}
package main;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import zking.com.android7.R;
/**
* 第三个页面的Fragment的JAVA类
*/
public class Ffriend extends Fragment {
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.ffriend, null);
//得到第三张图片的控件对象
ImageView bookapp3 = v.findViewById(R.id.bookapp3);
return v;
}
}
package main;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import zking.com.android7.R;
/**
* 第四个页面的Fragment的JAVA类
*/
public class Fme extends Fragment {
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fme, null);
//得到第四张图片的控件对象
ImageView bookapp4 = v.findViewById(R.id.bookapp4);
return v;
}
}
4、创建外部资源的布局文件,文件名为:myselect.xml
怎样创建?
切换到Project模式-->选中当前项目 new Android Rescourse File-->type为Drawable,root为select(必须小写)
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<!--未选中的图片-->
<item android:drawable="@drawable/smile" android:state_selected="false" />
<!--已选中的图片-->
<item android:drawable="@drawable/happy" android:state_selected="true" />
</selector>
5、创建一个Activity,文件名为:ViewPagerFragmentActivity
package zking.com.android7;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
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.ImageView;
import android.widget.LinearLayout;
import java.util.ArrayList;
import java.util.List;
import main.Ffriend;
import main.Fmain;
import main.Fme;
import main.Fphone;
public class ViewPagerFragmentActivity extends AppCompatActivity implements ViewPager.OnPageChangeListener {
private List<Fragment> fragmentList;
private ViewPager myViewPager;
private ViewPagerFragmentActivity.myFragmentPagerAdapter myFragmentPagerAdapter;
private ImageView[] dotViews;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_viewpagerfragment);
//把Fragment添加到List集合里面
fragmentList = new ArrayList<>();
fragmentList.add(new Fmain());
fragmentList.add(new Fphone());
fragmentList.add(new Ffriend());
fragmentList.add(new Fme());
//实例化适配器
myFragmentPagerAdapter = new myFragmentPagerAdapter(getSupportFragmentManager(), fragmentList);
//得到ViewPager对象
myViewPager = findViewById(R.id.myViewPager);
//为ViewPager设置适配器
myViewPager.setAdapter(myFragmentPagerAdapter);
myViewPager.setOnPageChangeListener(this);
//初始化显示第一个页面
myViewPager.setCurrentItem(0);
//生成相应数量的导航小圆点
LinearLayout layout = findViewById(R.id.dot_layout);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
//设置小圆点左右之间的间隔
params.setMargins(10, 0, 10, 0);
//得到页面个数
dotViews = new ImageView[fragmentList.size()];
for (int i = 0; i < fragmentList.size(); i++) {
ImageView imageView = new ImageView(this);
imageView.setLayoutParams(params);
imageView.setImageResource(R.drawable.myselector);
if (i == 0) {
//默认启动时,选中第一个小圆点
imageView.setSelected(true);
} else {
imageView.setSelected(false);
}
//得到每个小圆点的引用,用于滑动页面时,(onPageSelected方法中)更改它们的状态。
dotViews[i] = imageView;
//添加到布局里面显示
layout.addView(imageView);
}
}
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
/**
* 当前滑动显示页面的索引值,可以根据这个值,来设置相应小圆点的状态。
* @param position
*/
@Override
public void onPageSelected(int position) {
for (int i = 0; i < dotViews.length; i++) {
if (position == i) {
dotViews[i].setSelected(true);
} else {
dotViews[i].setSelected(false);
}
}
}
@Override
public void onPageScrollStateChanged(int state) {
}
/**
* 创建Fragment的适配器
*/
class myFragmentPagerAdapter extends FragmentPagerAdapter {
List<Fragment> fragmentList;
public myFragmentPagerAdapter(FragmentManager fm, List<Fragment> fragmentList) {
super(fm);
this.fragmentList = fragmentList;
}
/**
* 显示第几个页面
* @param position
* @return
*/
@Override
public Fragment getItem(int position) {
return fragmentList.get(position);
}
/**
* 有几个页面
* @return
*/
@Override
public int getCount() {
return fragmentList.size();
}
}
}