效果：
PagerData类：
package com.cloud.viewpagerdemo;
import java.io.Serializable;
class PagerData implements Serializable {
private int mImageResId;
private String mContent;
PagerData(int imageResId, String content) {
mImageResId = imageResId;
mContent = content;
}
public int getImageResId() {
return mImageResId;
}
public void setImageResId(int imageResId) {
mImageResId = imageResId;
}
public String getContent() {
return mContent;
}
public void setContent(String content) {
mContent = content;
}
}
PagerFragment类：
package com.cloud.viewpagerdemo; import android.graphics.Outline;
import android.os.Bundle;
import android.support.annotation.NonNull;
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.view.ViewOutlineProvider;
import android.widget.ImageView;
import android.widget.TextView; public class PagerFragment extends Fragment { private static final String ARG_DATA = "data"; private PagerData mData; private ImageView mImageView;
private TextView mContent; /**
* 通过静态方法获取Fragment实例，向Fragment传参数
* @param data 数据
* @return Fragment
*/
public static PagerFragment newInstance(PagerData data) {
PagerFragment fragment = new PagerFragment(); //使用FragmentArguments传递参数
Bundle args = new Bundle();
args.putSerializable(ARG_DATA, data);
fragment.setArguments(args);
return fragment;
} @Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mData = (PagerData) getArguments().getSerializable(ARG_DATA);
} @Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
@Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_pager, container, false); //绑定控件
mImageView = view.findViewById(R.id.image_view);
mContent = view.findViewById(R.id.text_content); //ImageView设置圆角
ViewOutlineProvider viewOutlineProvider = new ViewOutlineProvider() {
@Override
public void getOutline(View view, Outline outline) {
outline.setRoundRect(0, 0, mImageView.getWidth(), mImageView.getHeight(), 16);
}
}; mImageView.setOutlineProvider(viewOutlineProvider);
mImageView.setClipToOutline(true);
mImageView.setImageResource(mData.getImageResId());
mContent.setText(mData.getContent()); return view;
}
}
PagerActivity:
package com.cloud.viewpagerdemo; import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView; import java.util.ArrayList;
import java.util.List; public class PagerActivity extends AppCompatActivity { private List<PagerData> mPagerData = new ArrayList<>(); private ViewPager mViewPager;
private TextView mTextPage; private String page = "1 / 3"; @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pager); initData(); FragmentManager fragmentManager = getSupportFragmentManager(); mViewPager = findViewById(R.id.view_pager);
mTextPage = findViewById(R.id.text_page);
//设置ViewPager适配器
mViewPager.setAdapter(new FragmentStatePagerAdapter(fragmentManager) {
@Override
public Fragment getItem(int position) {
return PagerFragment.newInstance(mPagerData.get(position));
} @Override
public int getCount() {
return mPagerData.size();
}
}); //监听页面改变
mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { } @Override
public void onPageSelected(int position) {
//页面选中
page = String.valueOf(position + 1) + " / " + String.valueOf(mPagerData.size());
mTextPage.setText(page);
} @Override
public void onPageScrollStateChanged(int state) { }
});
//设置缓存页数
mViewPager.setOffscreenPageLimit(3);
//设置默认页
mViewPager.setCurrentItem(0); mTextPage.setText(page);
} private void initData() {
//添加三项数据
mPagerData.add(new PagerData(R.drawable.img_0, "Photo by Adam Krowitz"));
mPagerData.add(new PagerData(R.drawable.img_1, "Photo by Samuel Ferrara"));
mPagerData.add(new PagerData(R.drawable.img_2, "Photo by Earth"));
}
}
fragment_pager：
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
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"> <LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="32dp"
android:layout_marginEnd="16dp"
android:layout_marginStart="16dp"
android:layout_marginTop="16dp"
android:background="@drawable/pager_background"
android:elevation="4dp"
android:orientation="vertical"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"> <ImageView
android:id="@+id/image_view"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_margin="8dp"
android:layout_weight="1"
android:contentDescription="@null"
android:scaleType="centerCrop" /> <TextView
android:id="@+id/text_content"
android:layout_width="match_parent"
android:layout_height="125dp"
android:gravity="center"
android:padding="8dp"
android:textSize="18sp"
android:textColor="#000000"
tools:text="Content" /> </LinearLayout> </android.support.constraint.ConstraintLayout>
activity_pager：
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
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"
tools:context=".PagerActivity"> <android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="48dp"
android:background="@color/colorPrimary"
android:elevation="4dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"> <TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:textSize="18sp"
android:textColor="#FFFFFF"
android:text="@string/app_name" /> </android.support.v7.widget.Toolbar> <android.support.v4.view.ViewPager
android:id="@+id/view_pager"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/toolbar"> </android.support.v4.view.ViewPager> <TextView
android:id="@+id/text_page"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="4dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="@+id/toolbar"
tools:text="page" /> </android.support.constraint.ConstraintLayout>