├── README.md
├── app
    ├── build.gradle
    ├── proguard-rules.pro
    └── src
    │   ├── androidTest
    │       └── java
    │       │   └── com
    │       │       └── wangxw
    │       │           └── fragmentlazyloaddemo
    │       │               └── ExampleInstrumentedTest.java
    │   ├── main
    │       ├── AndroidManifest.xml
    │       ├── java
    │       │   └── com
    │       │   │   └── wangxw
    │       │   │       └── fragmentlazyloaddemo
    │       │   │           ├── MainActivity.java
    │       │   │           ├── MainAdapter.java
    │       │   │           └── fragment
    │       │   │               ├── AFragment.java
    │       │   │               ├── BFragment.java
    │       │   │               ├── BaseFragment.java
    │       │   │               └── CFragment.java
    │       └── res
    │       │   ├── layout
    │       │       ├── activity_main.xml
    │       │       └── fragment_item.xml
    │       │   ├── mipmap-hdpi
    │       │       └── ic_launcher.png
    │       │   ├── mipmap-mdpi
    │       │       └── ic_launcher.png
    │       │   ├── mipmap-xhdpi
    │       │       └── ic_launcher.png
    │       │   ├── mipmap-xxhdpi
    │       │       └── ic_launcher.png
    │       │   ├── mipmap-xxxhdpi
    │       │       └── ic_launcher.png
    │       │   ├── values-w820dp
    │       │       └── dimens.xml
    │       │   └── values
    │       │       ├── colors.xml
    │       │       ├── dimens.xml
    │       │       ├── strings.xml
    │       │       └── styles.xml
    │   └── test
    │       └── java
    │           └── com
    │               └── wangxw
    │                   └── fragmentlazyloaddemo
    │                       └── ExampleUnitTest.java
├── build.gradle
├── screenshots
    ├── fragment_lazyload.gif
    └── viewpager_pre2pages.jpg
└── settings.gradle


/README.md:
--------------------------------------------------------------------------------
 1 | # ViewPager+Fragment组合的预加载和懒加载
 2 | 
 3 | [简书直达](http://www.jianshu.com/p/7a47907f49c2)
 4 | 
 5 | [CSDN直达](http://blog.csdn.net/wangxw725/article/details/55001633)
 6 | 
 7 | 预加载
 8 | 
 9 | <img src="screenshots/viewpager_pre2pages.jpg" />
10 | 
11 | 懒加载
12 | 
13 | <img src="screenshots/fragment_lazyload.gif" />
14 | 
15 | 
16 | 
17 | 


--------------------------------------------------------------------------------
/app/build.gradle:
--------------------------------------------------------------------------------
 1 | apply plugin: 'com.android.application'
 2 | 
 3 | android {
 4 |     compileSdkVersion 24
 5 |     buildToolsVersion "24.0.2"
 6 |     defaultConfig {
 7 |         applicationId "com.wangxw.fragmentlazyloaddemo"
 8 |         minSdkVersion 15
 9 |         targetSdkVersion 24
10 |         versionCode 1
11 |         versionName "1.0"
12 |         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
13 |     }
14 |     buildTypes {
15 |         release {
16 |             minifyEnabled false
17 |             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
18 |         }
19 |     }
20 | }
21 | 
22 | dependencies {
23 |     compile fileTree(dir: 'libs', include: ['*.jar'])
24 |     androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
25 |         exclude group: 'com.android.support', module: 'support-annotations'
26 |     })
27 |     compile 'com.android.support:appcompat-v7:24.2.1'
28 |     compile 'com.android.support:design:24.0.0'
29 |     testCompile 'junit:junit:4.12'
30 | }
31 | 


--------------------------------------------------------------------------------
/app/proguard-rules.pro:
--------------------------------------------------------------------------------
 1 | # Add project specific ProGuard rules here.
 2 | # By default, the flags in this file are appended to flags specified
 3 | # in C:\Dev\Develop\Android\sdk/tools/proguard/proguard-android.txt
 4 | # You can edit the include path and order by changing the proguardFiles
 5 | # directive in build.gradle.
 6 | #
 7 | # For more details, see
 8 | #   http://developer.android.com/guide/developing/tools/proguard.html
 9 | 
10 | # Add any project specific keep options here:
11 | 
12 | # If your project uses WebView with JS, uncomment the following
13 | # and specify the fully qualified class name to the JavaScript interface
14 | # class:
15 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview {
16 | #   public *;
17 | #}
18 | 


--------------------------------------------------------------------------------
/app/src/androidTest/java/com/wangxw/fragmentlazyloaddemo/ExampleInstrumentedTest.java:
--------------------------------------------------------------------------------
 1 | package com.wangxw.fragmentlazyloaddemo;
 2 | 
 3 | import android.content.Context;
 4 | import android.support.test.InstrumentationRegistry;
 5 | import android.support.test.runner.AndroidJUnit4;
 6 | 
 7 | import org.junit.Test;
 8 | import org.junit.runner.RunWith;
 9 | 
10 | import static org.junit.Assert.*;
11 | 
12 | /**
13 |  * Instrumentation test, which will execute on an Android device.
14 |  *
15 |  * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
16 |  */
17 | @RunWith(AndroidJUnit4.class)
18 | public class ExampleInstrumentedTest {
19 |     @Test
20 |     public void useAppContext() throws Exception {
21 |         // Context of the app under test.
22 |         Context appContext = InstrumentationRegistry.getTargetContext();
23 | 
24 |         assertEquals("com.wangxw.fragmentlazyloaddemo", appContext.getPackageName());
25 |     }
26 | }
27 | 


--------------------------------------------------------------------------------
/app/src/main/AndroidManifest.xml:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="utf-8"?>
 2 | <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 3 |           package="com.wangxw.fragmentlazyloaddemo">
 4 | 
 5 |     <application
 6 |         android:allowBackup="true"
 7 |         android:icon="@mipmap/ic_launcher"
 8 |         android:label="@string/app_name"
 9 |         android:supportsRtl="true"
10 |         android:theme="@style/AppTheme">
11 |         <activity android:name=".MainActivity">
12 |             <intent-filter>
13 |                 <action android:name="android.intent.action.MAIN"/>
14 | 
15 |                 <category android:name="android.intent.category.LAUNCHER"/>
16 |             </intent-filter>
17 |         </activity>
18 |     </application>
19 | 
20 | </manifest>


--------------------------------------------------------------------------------
/app/src/main/java/com/wangxw/fragmentlazyloaddemo/MainActivity.java:
--------------------------------------------------------------------------------
  1 | package com.wangxw.fragmentlazyloaddemo;
  2 | 
  3 | import android.content.Intent;
  4 | import android.support.design.widget.TabLayout;
  5 | import android.support.v4.app.Fragment;
  6 | import android.support.v4.view.ViewPager;
  7 | import android.support.v7.app.AppCompatActivity;
  8 | import android.os.Bundle;
  9 | import android.util.Log;
 10 | import android.view.View;
 11 | import android.widget.LinearLayout;
 12 | import android.widget.TextView;
 13 | 
 14 | import com.wangxw.fragmentlazyloaddemo.fragment.AFragment;
 15 | import com.wangxw.fragmentlazyloaddemo.fragment.BFragment;
 16 | import com.wangxw.fragmentlazyloaddemo.fragment.CFragment;
 17 | 
 18 | import java.util.ArrayList;
 19 | 
 20 | public class MainActivity extends AppCompatActivity implements View.OnClickListener {
 21 | 
 22 |     private TabLayout mTabLayout;
 23 |     private ViewPager mViewPager;
 24 |     private LinearLayout mllLogs;
 25 |     private static int sOffScreenLimit = 1;
 26 | 
 27 |     @Override
 28 |     protected void onCreate(Bundle savedInstanceState) {
 29 |         super.onCreate(savedInstanceState);
 30 |         setContentView(R.layout.activity_main);
 31 |         initView();
 32 |         initData();
 33 |         initListener();
 34 |     }
 35 | 
 36 |     private void initView() {
 37 |         mTabLayout = (TabLayout) findViewById(R.id.tablayout);
 38 |         mViewPager = (ViewPager) findViewById(R.id.viewpager);
 39 |         mllLogs = (LinearLayout) findViewById(R.id.ll_log_container);
 40 |     }
 41 | 
 42 |     private void initData() {
 43 |         //填充数据
 44 |         ArrayList<Fragment> fragmentList = new ArrayList<>();
 45 |         fragmentList.add(new AFragment());
 46 |         fragmentList.add(new BFragment());
 47 |         fragmentList.add(new CFragment());
 48 | 
 49 |         ArrayList<String> titleList = new ArrayList<>();
 50 |         for (int i = 0; i < 3; i++) {
 51 |             titleList.add("Page_"+i);
 52 |         }
 53 | 
 54 |         MainAdapter adapter = new MainAdapter(getSupportFragmentManager(), fragmentList, titleList);
 55 |         mViewPager.setAdapter(adapter);
 56 |         mTabLayout.setupWithViewPager(mViewPager);
 57 |         if(sOffScreenLimit >1){
 58 |             mViewPager.setOffscreenPageLimit(sOffScreenLimit);
 59 |             Log.i("wxw","偏移量>1...:"+ sOffScreenLimit);
 60 |         }else {
 61 |             Log.i("wxw","偏移量...:"+ sOffScreenLimit);
 62 |         }
 63 |     }
 64 | 
 65 |     private void initListener() {
 66 |         findViewById(R.id.btn_viewpager_mode_default).setOnClickListener(this);
 67 |         findViewById(R.id.btn_viewpager_mode_load2page).setOnClickListener(this);
 68 |         findViewById(R.id.btn_clear_log).setOnClickListener(this);
 69 |     }
 70 | 
 71 |     @Override
 72 |     public void onClick(View v) {
 73 |         switch (v.getId()){
 74 |             case R.id.btn_viewpager_mode_default:       //默认模式
 75 |                 sOffScreenLimit = 1;
 76 |                 finish();
 77 |                 startActivity(new Intent(this,MainActivity.class));
 78 |                 overridePendingTransition(0,0);
 79 |                 break;
 80 |             case R.id.btn_viewpager_mode_load2page:     //预加载两页
 81 |                 sOffScreenLimit = 2;
 82 |                 finish();
 83 |                 startActivity(new Intent(this,MainActivity.class));
 84 |                 overridePendingTransition(0,0);
 85 |                 break;
 86 |             case R.id.btn_clear_log:                    //清空Log
 87 |                 mllLogs.removeAllViews();
 88 |                 break;
 89 |             default:
 90 |                 break;
 91 |         }
 92 |     }
 93 | 
 94 |     public void addLog(TextView logView){
 95 |         mllLogs.addView(logView);
 96 |     }
 97 | 
 98 | 
 99 | }
100 | 


--------------------------------------------------------------------------------
/app/src/main/java/com/wangxw/fragmentlazyloaddemo/MainAdapter.java:
--------------------------------------------------------------------------------
 1 | package com.wangxw.fragmentlazyloaddemo;
 2 | 
 3 | import android.support.v4.app.Fragment;
 4 | import android.support.v4.app.FragmentManager;
 5 | import android.support.v4.app.FragmentPagerAdapter;
 6 | 
 7 | import java.util.List;
 8 | 
 9 | /**
10 |  * Created by wangxw on 2017/2/10 0009 15:05.
11 |  * E-mail:wangxw725@163.com
12 |  * function:
13 |  */
14 | public class MainAdapter extends FragmentPagerAdapter {
15 | 
16 |     List<Fragment> fragmentList;
17 |     List<String> titleList;
18 | 
19 |     public MainAdapter(FragmentManager fm, List<Fragment> fragmentList, List<String> titleList) {
20 |         super(fm);
21 |         this.fragmentList = fragmentList;
22 |         this.titleList = titleList;
23 |     }
24 | 
25 |     @Override
26 |     public int getCount() {
27 |         return fragmentList!=null ? fragmentList.size() : 0;
28 |     }
29 | 
30 |     @Override
31 |     public Fragment getItem(int position) {
32 |         return fragmentList.get(position);
33 |     }
34 | 
35 |     @Override
36 |     public CharSequence getPageTitle(int position) {
37 |         return titleList.get(position);
38 |     }
39 | }
40 | 


--------------------------------------------------------------------------------
/app/src/main/java/com/wangxw/fragmentlazyloaddemo/fragment/AFragment.java:
--------------------------------------------------------------------------------
 1 | package com.wangxw.fragmentlazyloaddemo.fragment;
 2 | 
 3 | import android.os.Bundle;
 4 | import android.support.annotation.Nullable;
 5 | import android.support.v4.app.Fragment;
 6 | import android.util.Log;
 7 | import android.view.LayoutInflater;
 8 | import android.view.View;
 9 | import android.view.ViewGroup;
10 | import android.widget.TextView;
11 | 
12 | import com.wangxw.fragmentlazyloaddemo.R;
13 | 
14 | /**
15 |  * Created by wangxw on 2017/2/10 0010 14:58.
16 |  * E-mail:wangxw725@163.com
17 |  * function:
18 |  */
19 | public class AFragment extends BaseFragment {
20 | 
21 |     @Override
22 |     protected void loadData() {
23 |         Log.i("wxw","AFragment可见,可以加载数据了");
24 |     }
25 | 
26 |     @Override
27 |     protected String getFragmentTextviewContent() {
28 |         return "Page_0";
29 |     }
30 | }
31 | 


--------------------------------------------------------------------------------
/app/src/main/java/com/wangxw/fragmentlazyloaddemo/fragment/BFragment.java:
--------------------------------------------------------------------------------
 1 | package com.wangxw.fragmentlazyloaddemo.fragment;
 2 | 
 3 | import android.os.Bundle;
 4 | import android.support.annotation.Nullable;
 5 | import android.support.v4.app.Fragment;
 6 | import android.util.Log;
 7 | import android.view.LayoutInflater;
 8 | import android.view.View;
 9 | import android.view.ViewGroup;
10 | import android.widget.TextView;
11 | 
12 | import com.wangxw.fragmentlazyloaddemo.R;
13 | 
14 | /**
15 |  * Created by wangxw on 2017/2/10 0010 14:58.
16 |  * E-mail:wangxw725@163.com
17 |  * function:
18 |  */
19 | public class BFragment extends BaseFragment {
20 | 
21 | 
22 |     @Override
23 |     protected void loadData() {
24 |         Log.i("wxw","BFragment可见,可以加载数据了");
25 |     }
26 | 
27 |     @Override
28 |     protected String getFragmentTextviewContent() {
29 |         return "Page_1";
30 |     }
31 | }
32 | 


--------------------------------------------------------------------------------
/app/src/main/java/com/wangxw/fragmentlazyloaddemo/fragment/BaseFragment.java:
--------------------------------------------------------------------------------
 1 | package com.wangxw.fragmentlazyloaddemo.fragment;
 2 | 
 3 | import android.os.Bundle;
 4 | import android.support.annotation.Nullable;
 5 | import android.support.v4.app.Fragment;
 6 | import android.view.LayoutInflater;
 7 | import android.view.View;
 8 | import android.view.ViewGroup;
 9 | import android.widget.TextView;
10 | 
11 | import com.wangxw.fragmentlazyloaddemo.MainActivity;
12 | import com.wangxw.fragmentlazyloaddemo.R;
13 | 
14 | /**
15 |  * Created by wangxw on 2017/2/10 0010 15:21.
16 |  * E-mail:wangxw725@163.com
17 |  * function:
18 |  */
19 | public abstract class BaseFragment extends Fragment {
20 | 
21 |     private String mTextviewContent;
22 |     private MainActivity mMainActivity;
23 | 
24 |     //Fragment的View加载完毕的标记
25 |     private boolean isViewCreated;
26 |     //Fragment对用户可见的标记
27 |     private boolean isUIVisible;
28 | 
29 |     @Override
30 |     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
31 |         View view = inflater.inflate(R.layout.fragment_item, container, false);
32 |         initView(view);
33 |         return view ;
34 |     }
35 | 
36 |     private void initView(View view) {
37 |         TextView textView = (TextView) view.findViewById(R.id.textview);
38 |         mTextviewContent = getFragmentTextviewContent();
39 |         textView.setText(mTextviewContent);
40 | 
41 |         mMainActivity = (MainActivity) getActivity();
42 |         printLog(mTextviewContent +"加载了");
43 |     }
44 | 
45 |     @Override
46 |     public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
47 |         super.onViewCreated(view, savedInstanceState);
48 |         isViewCreated = true;
49 |         lazyLoad();
50 |     }
51 | 
52 |     @Override
53 |     public void setUserVisibleHint(boolean isVisibleToUser) {
54 |         super.setUserVisibleHint(isVisibleToUser);
55 |         //isVisibleToUser这个boolean值表示:该Fragment的UI 用户是否可见
56 |         if (isVisibleToUser) {
57 |             isUIVisible = true;
58 |             lazyLoad();
59 |         } else {
60 |             isUIVisible = false;
61 |         }
62 |     }
63 | 
64 |     private void lazyLoad() {
65 |         //这里进行双重标记判断,是因为setUserVisibleHint会多次回调,并且会在onCreateView执行前回调,必须确保onCreateView加载完毕且页面可见,才加载数据
66 |         if (isViewCreated && isUIVisible) {
67 |             loadData();
68 |             //数据加载完毕,恢复标记,防止重复加载
69 |             isViewCreated = false;
70 |             isUIVisible = false;
71 | 
72 |             printLog(mTextviewContent+"可见,加载数据");
73 |         }
74 |     }
75 | 
76 | 
77 |     protected abstract void loadData();
78 | 
79 | 
80 |     @Override
81 |     public void onDestroyView() {
82 |         super.onDestroyView();
83 |         //页面销毁,恢复标记
84 |         isViewCreated = false;
85 |         isUIVisible = false;
86 | 
87 |         printLog(mTextviewContent +"销毁了");
88 |     }
89 | 
90 |     private void printLog(String logStr) {
91 |         TextView logView = new TextView(getContext());
92 |         logView.setText(logStr);
93 |         mMainActivity.addLog(logView);
94 |     }
95 | 
96 |     /**Fragment中TextView显示的内容*/
97 |     protected abstract String getFragmentTextviewContent();
98 | }
99 | 


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/app/src/main/java/com/wangxw/fragmentlazyloaddemo/fragment/CFragment.java:
--------------------------------------------------------------------------------
 1 | package com.wangxw.fragmentlazyloaddemo.fragment;
 2 | 
 3 | import android.os.Bundle;
 4 | import android.support.annotation.Nullable;
 5 | import android.support.v4.app.Fragment;
 6 | import android.util.Log;
 7 | import android.view.LayoutInflater;
 8 | import android.view.View;
 9 | import android.view.ViewGroup;
10 | import android.widget.TextView;
11 | 
12 | import com.wangxw.fragmentlazyloaddemo.R;
13 | 
14 | /**
15 |  * Created by wangxw on 2017/2/10 0010 14:58.
16 |  * E-mail:wangxw725@163.com
17 |  * function:
18 |  */
19 | public class CFragment extends BaseFragment {
20 | 
21 | 
22 |     @Override
23 |     protected void loadData() {
24 |         Log.i("wxw","CFragment可见,可以加载数据了");
25 |     }
26 | 
27 |     @Override
28 |     protected String getFragmentTextviewContent() {
29 |         return "Page_2";
30 |     }
31 | }
32 | 


--------------------------------------------------------------------------------
/app/src/main/res/layout/activity_main.xml:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="utf-8"?>
 2 | <LinearLayout
 3 |     xmlns:android="http://schemas.android.com/apk/res/android"
 4 |     xmlns:app="http://schemas.android.com/apk/res-auto"
 5 |     android:layout_width="match_parent"
 6 |     android:layout_height="match_parent"
 7 |     android:orientation="vertical">
 8 | 
 9 |     <android.support.design.widget.TabLayout
10 |         android:id="@+id/tablayout"
11 |         android:layout_width="match_parent"
12 |         android:layout_height="wrap_content"
13 |         app:layout_scrollFlags="scroll|enterAlways"
14 |         app:tabBackground="?attr/colorPrimary"
15 |         app:tabIndicatorHeight="2dp"
16 |         app:tabTextColor="@android:color/white"/>
17 | 
18 |     <android.support.v4.view.ViewPager
19 |         android:id="@+id/viewpager"
20 |         android:layout_width="match_parent"
21 |         android:layout_height="300dp"/>
22 | 
23 | 
24 |     <LinearLayout
25 |         android:layout_width="match_parent"
26 |         android:layout_height="match_parent"
27 |         android:orientation="horizontal">
28 | 
29 |         <!--Log区域-->
30 |         <ScrollView
31 |             android:layout_width="0dp"
32 |             android:layout_weight="3"
33 |             android:background="@android:color/darker_gray"
34 |             android:layout_height="match_parent">
35 | 
36 |             <LinearLayout
37 |                 android:id="@+id/ll_log_container"
38 |                 android:layout_width="wrap_content"
39 |                 android:layout_height="wrap_content"
40 |                 android:orientation="vertical"/>
41 | 
42 |         </ScrollView>
43 | 
44 |         <!--模式选择-->
45 |         <LinearLayout
46 |             android:layout_width="0dp"
47 |             android:layout_weight="1"
48 |             android:layout_height="wrap_content"
49 |             android:orientation="vertical">
50 | 
51 |             <Button
52 |                 android:id="@+id/btn_viewpager_mode_default"
53 |                 android:layout_width="wrap_content"
54 |                 android:text="默认模式"
55 |                 android:layout_height="wrap_content"/>
56 | 
57 |             <Button
58 |                 android:id="@+id/btn_viewpager_mode_load2page"
59 |                 android:layout_width="wrap_content"
60 |                 android:text="预加载2页"
61 |                 android:layout_height="wrap_content"/>
62 | 
63 |             <Button
64 |                 android:id="@+id/btn_clear_log"
65 |                 android:layout_width="wrap_content"
66 |                 android:text="清空Log"
67 |                 android:layout_height="wrap_content"/>
68 | 
69 | 
70 |         </LinearLayout>
71 | 
72 | 
73 |     </LinearLayout>
74 | 
75 | 
76 | 
77 | </LinearLayout>
78 | 


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/app/src/main/res/layout/fragment_item.xml:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="utf-8"?>
 2 | <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3 |              android:layout_width="match_parent"
 4 |              android:layout_height="match_parent">
 5 | 
 6 |     <TextView
 7 |         android:id="@+id/textview"
 8 |         android:layout_width="wrap_content"
 9 |         android:layout_gravity="center"
10 |         android:textSize="30sp"
11 |         android:text="Fragment"
12 |         android:layout_height="wrap_content"/>
13 | 
14 | </FrameLayout>


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/app/src/main/res/mipmap-hdpi/ic_launcher.png:
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https://raw.githubusercontent.com/Crocutax/FragmentLazyloadDemo/262492d5b12f473a231024d8b99f3c0c15018ecb/app/src/main/res/mipmap-hdpi/ic_launcher.png


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/app/src/main/res/mipmap-mdpi/ic_launcher.png:
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https://raw.githubusercontent.com/Crocutax/FragmentLazyloadDemo/262492d5b12f473a231024d8b99f3c0c15018ecb/app/src/main/res/mipmap-mdpi/ic_launcher.png


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/app/src/main/res/mipmap-xhdpi/ic_launcher.png:
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https://raw.githubusercontent.com/Crocutax/FragmentLazyloadDemo/262492d5b12f473a231024d8b99f3c0c15018ecb/app/src/main/res/mipmap-xhdpi/ic_launcher.png


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/app/src/main/res/mipmap-xxhdpi/ic_launcher.png:
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https://raw.githubusercontent.com/Crocutax/FragmentLazyloadDemo/262492d5b12f473a231024d8b99f3c0c15018ecb/app/src/main/res/mipmap-xxhdpi/ic_launcher.png


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/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png:
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https://raw.githubusercontent.com/Crocutax/FragmentLazyloadDemo/262492d5b12f473a231024d8b99f3c0c15018ecb/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png


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/app/src/main/res/values-w820dp/dimens.xml:
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1 | <resources>
2 |     <!-- Example customization of dimensions originally defined in res/values/dimens.xml
3 |          (such as screen margins) for screens with more than 820dp of available width. This
4 |          would include 7" and 10" devices in landscape (~960dp and ~1280dp respectively). -->
5 |     <dimen name="activity_horizontal_margin">64dp</dimen>
6 | </resources>
7 | 


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/app/src/main/res/values/colors.xml:
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1 | <?xml version="1.0" encoding="utf-8"?>
2 | <resources>
3 |     <color name="colorPrimary">#3F51B5</color>
4 |     <color name="colorPrimaryDark">#303F9F</color>
5 |     <color name="colorAccent">#FF4081</color>
6 | </resources>
7 | 


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/app/src/main/res/values/dimens.xml:
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1 | <resources>
2 |     <!-- Default screen margins, per the Android Design guidelines. -->
3 |     <dimen name="activity_horizontal_margin">16dp</dimen>
4 |     <dimen name="activity_vertical_margin">16dp</dimen>
5 | </resources>
6 | 


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/app/src/main/res/values/strings.xml:
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1 | <resources>
2 |     <string name="app_name">FragmentLazyLoadDemo</string>
3 | </resources>
4 | 


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/app/src/main/res/values/styles.xml:
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 1 | <resources>
 2 | 
 3 |     <!-- Base application theme. -->
 4 |     <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
 5 |         <!-- Customize your theme here. -->
 6 |         <item name="colorPrimary">@color/colorPrimary</item>
 7 |         <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
 8 |         <item name="colorAccent">@color/colorAccent</item>
 9 |     </style>
10 | 
11 | </resources>
12 | 


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/app/src/test/java/com/wangxw/fragmentlazyloaddemo/ExampleUnitTest.java:
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 1 | package com.wangxw.fragmentlazyloaddemo;
 2 | 
 3 | import org.junit.Test;
 4 | 
 5 | import static org.junit.Assert.*;
 6 | 
 7 | /**
 8 |  * Example local unit test, which will execute on the development machine (host).
 9 |  *
10 |  * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
11 |  */
12 | public class ExampleUnitTest {
13 |     @Test
14 |     public void addition_isCorrect() throws Exception {
15 |         assertEquals(4, 2 + 2);
16 |     }
17 | }


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/build.gradle:
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 1 | // Top-level build file where you can add configuration options common to all sub-projects/modules.
 2 | 
 3 | buildscript {
 4 |     repositories {
 5 |         jcenter()
 6 |     }
 7 |     dependencies {
 8 |         classpath 'com.android.tools.build:gradle:2.2.3'
 9 | 
10 |         // NOTE: Do not place your application dependencies here; they belong
11 |         // in the individual module build.gradle files
12 |     }
13 | }
14 | 
15 | allprojects {
16 |     repositories {
17 |         jcenter()
18 |     }
19 | }
20 | 
21 | task clean(type: Delete) {
22 |     delete rootProject.buildDir
23 | }
24 | 


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/screenshots/fragment_lazyload.gif:
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https://raw.githubusercontent.com/Crocutax/FragmentLazyloadDemo/262492d5b12f473a231024d8b99f3c0c15018ecb/screenshots/fragment_lazyload.gif


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/screenshots/viewpager_pre2pages.jpg:
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https://raw.githubusercontent.com/Crocutax/FragmentLazyloadDemo/262492d5b12f473a231024d8b99f3c0c15018ecb/screenshots/viewpager_pre2pages.jpg


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/settings.gradle:
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1 | include ':app'
2 | 


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