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Android ViewPager + Fragment实现滑动页面

Android开发

效果:

PagerData类:

 1 package com.cloud.viewpagerdemo;
 2 
 3 import java.io.Serializable;
 4 
 5 class PagerData implements Serializable {
 6 
 7     private int mImageResId;
 8     private String mContent;
 9 
10     PagerData(int imageResId, String content) {
11         mImageResId = imageResId;
12         mContent = content;
13     }
14 
15     public int getImageResId() {
16         return mImageResId;
17     }
18 
19     public void setImageResId(int imageResId) {
20         mImageResId = imageResId;
21     }
22 
23     public String getContent() {
24         return mContent;
25     }
26 
27     public void setContent(String content) {
28         mContent = content;
29     }
30 }

PagerFragment类:

 1 package com.cloud.viewpagerdemo;
 2 
 3 import android.graphics.Outline;
 4 import android.os.Bundle;
 5 import android.support.annotation.NonNull;
 6 import android.support.annotation.Nullable;
 7 import android.support.v4.app.Fragment;
 8 import android.view.LayoutInflater;
 9 import android.view.View;
10 import android.view.ViewGroup;
11 import android.view.ViewOutlineProvider;
12 import android.widget.ImageView;
13 import android.widget.TextView;
14 
15 public class PagerFragment extends Fragment {
16 
17     private static final String ARG_DATA = "data";
18 
19     private PagerData mData;
20 
21     private ImageView mImageView;
22     private TextView mContent;
23 
24     /**
25      * 通过静态方法获取Fragment实例,向Fragment传参数
26      * @param data 数据
27      * @return Fragment
28      */
29     public static PagerFragment newInstance(PagerData data) {
30         PagerFragment fragment = new PagerFragment();
31 
32         //使用FragmentArguments传递参数
33         Bundle args = new Bundle();
34         args.putSerializable(ARG_DATA, data);
35         fragment.setArguments(args);
36         return fragment;
37     }
38 
39     @Override
40     public void onCreate(@Nullable Bundle savedInstanceState) {
41         super.onCreate(savedInstanceState);
42         mData = (PagerData) getArguments().getSerializable(ARG_DATA);
43     }
44 
45     @Nullable
46     @Override
47     public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
48                              @Nullable Bundle savedInstanceState) {
49         View view = inflater.inflate(R.layout.fragment_pager, container, false);
50 
51         //绑定控件
52         mImageView = view.findViewById(R.id.image_view);
53         mContent = view.findViewById(R.id.text_content);
54 
55         //ImageView设置圆角
56         ViewOutlineProvider viewOutlineProvider = new ViewOutlineProvider() {
57             @Override
58             public void getOutline(View view, Outline outline) {
59                 outline.setRoundRect(0, 0, mImageView.getWidth(), mImageView.getHeight(), 16);
60             }
61         };
62 
63         mImageView.setOutlineProvider(viewOutlineProvider);
64         mImageView.setClipToOutline(true);
65         mImageView.setImageResource(mData.getImageResId());
66         mContent.setText(mData.getContent());
67 
68         return view;
69     }
70 }

PagerActivity:

 1 package com.cloud.viewpagerdemo;
 2 
 3 import android.support.v4.app.Fragment;
 4 import android.support.v4.app.FragmentManager;
 5 import android.support.v4.app.FragmentStatePagerAdapter;
 6 import android.support.v4.view.ViewPager;
 7 import android.support.v7.app.AppCompatActivity;
 8 import android.os.Bundle;
 9 import android.widget.TextView;
10 
11 import java.util.ArrayList;
12 import java.util.List;
13 
14 public class PagerActivity extends AppCompatActivity {
15 
16     private List<PagerData> mPagerData = new ArrayList<>();
17 
18     private ViewPager mViewPager;
19     private TextView mTextPage;
20 
21     private String page = "1 / 3";
22 
23     @Override
24     protected void onCreate(Bundle savedInstanceState) {
25         super.onCreate(savedInstanceState);
26         setContentView(R.layout.activity_pager);
27 
28         initData();
29 
30         FragmentManager fragmentManager = getSupportFragmentManager();
31 
32         mViewPager = findViewById(R.id.view_pager);
33         mTextPage = findViewById(R.id.text_page);
34         //设置ViewPager适配器
35         mViewPager.setAdapter(new FragmentStatePagerAdapter(fragmentManager) {
36             @Override
37             public Fragment getItem(int position) {
38                 return PagerFragment.newInstance(mPagerData.get(position));
39             }
40 
41             @Override
42             public int getCount() {
43                 return mPagerData.size();
44             }
45         });
46 
47         //监听页面改变
48         mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
49             @Override
50             public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
51 
52             }
53 
54             @Override
55             public void onPageSelected(int position) {
56                 //页面选中
57                 page = String.valueOf(position + 1) + " / " + String.valueOf(mPagerData.size());
58                 mTextPage.setText(page);
59             }
60 
61             @Override
62             public void onPageScrollStateChanged(int state) {
63 
64             }
65         });
66         //设置缓存页数
67         mViewPager.setOffscreenPageLimit(3);
68         //设置默认页
69         mViewPager.setCurrentItem(0);
70 
71         mTextPage.setText(page);
72     }
73 
74     private void initData() {
75         //添加三项数据
76         mPagerData.add(new PagerData(R.drawable.img_0, "Photo by Adam Krowitz"));
77         mPagerData.add(new PagerData(R.drawable.img_1, "Photo by Samuel Ferrara"));
78         mPagerData.add(new PagerData(R.drawable.img_2, "Photo by Earth"));
79     }
80 }

fragment_pager:

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <android.support.constraint.ConstraintLayout
 3     xmlns:android="http://schemas.android.com/apk/res/android"
 4     xmlns:app="http://schemas.android.com/apk/res-auto"
 5     xmlns:tools="http://schemas.android.com/tools"
 6     android:layout_width="match_parent"
 7     android:layout_height="match_parent">
 8 
 9     <LinearLayout
10         android:layout_width="match_parent"
11         android:layout_height="match_parent"
12         android:layout_marginBottom="32dp"
13         android:layout_marginEnd="16dp"
14         android:layout_marginStart="16dp"
15         android:layout_marginTop="16dp"
16         android:background="@drawable/pager_background"
17         android:elevation="4dp"
18         android:orientation="vertical"
19         app:layout_constraintBottom_toBottomOf="parent"
20         app:layout_constraintEnd_toEndOf="parent"
21         app:layout_constraintStart_toStartOf="parent"
22         app:layout_constraintTop_toTopOf="parent">
23 
24         <ImageView
25             android:id="@+id/image_view"
26             android:layout_width="match_parent"
27             android:layout_height="0dp"
28             android:layout_margin="8dp"
29             android:layout_weight="1"
30             android:contentDescription="@null"
31             android:scaleType="centerCrop" />
32 
33         <TextView
34             android:id="@+id/text_content"
35             android:layout_width="match_parent"
36             android:layout_height="125dp"
37             android:gravity="center"
38             android:padding="8dp"
39             android:textSize="18sp"
40             android:textColor="#000000"
41             tools:text="Content" />
42 
43     </LinearLayout>
44 
45 </android.support.constraint.ConstraintLayout>

activity_pager:

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <android.support.constraint.ConstraintLayout
 3     xmlns:android="http://schemas.android.com/apk/res/android"
 4     xmlns:app="http://schemas.android.com/apk/res-auto"
 5     xmlns:tools="http://schemas.android.com/tools"
 6     android:layout_width="match_parent"
 7     android:layout_height="match_parent"
 8     tools:context=".PagerActivity">
 9 
10     <android.support.v7.widget.Toolbar
11         android:id="@+id/toolbar"
12         android:layout_width="match_parent"
13         android:layout_height="48dp"
14         android:background="@color/colorPrimary"
15         android:elevation="4dp"
16         app:layout_constraintEnd_toEndOf="parent"
17         app:layout_constraintStart_toStartOf="parent"
18         app:layout_constraintTop_toTopOf="parent">
19 
20         <TextView
21             android:layout_width="wrap_content"
22             android:layout_height="wrap_content"
23             android:layout_gravity="center"
24             android:textSize="18sp"
25             android:textColor="#FFFFFF"
26             android:text="@string/app_name" />
27 
28     </android.support.v7.widget.Toolbar>
29 
30     <android.support.v4.view.ViewPager
31         android:id="@+id/view_pager"
32         android:layout_width="0dp"
33         android:layout_height="0dp"
34         app:layout_constraintBottom_toBottomOf="parent"
35         app:layout_constraintEnd_toEndOf="parent"
36         app:layout_constraintStart_toStartOf="parent"
37         app:layout_constraintTop_toBottomOf="@+id/toolbar">
38 
39     </android.support.v4.view.ViewPager>
40 
41     <TextView
42         android:id="@+id/text_page"
43         android:layout_width="wrap_content"
44         android:layout_height="wrap_content"
45         android:layout_marginBottom="4dp"
46         app:layout_constraintBottom_toBottomOf="parent"
47         app:layout_constraintEnd_toEndOf="parent"
48         app:layout_constraintStart_toStartOf="@+id/toolbar"
49         tools:text="page" />
50 
51 </android.support.constraint.ConstraintLayout>

 

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