Android学习之Android ViewPager引导页

Android ViewPager引导页

ViewPager实现引导页

//讲解ViewPager的实现，实现左右滑动的效果，掌握ViewPager的使用
//创建GuideActivity引导类
//GuideActivity.java

public class GuideActivity extends Activity {
private ViewPager viewPager;
private ViewPagerAdapter viewPagerAdapter;
private List<View> views;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.guide);
initViews();
}

private void initViews() {
LayoutInflater layoutInflater = LayoutInflater.from(this);
views = new ArrayList<View>();
views.add(layoutInflater.inflate(R.layout.one, null));
views.add(layoutInflater.inflate(R.layout.two, null));
views.add(layoutInflater.inflate(R.layout.three, null));

viewPagerAdapter = new ViewPagerAdapter(this,views);
viewPager = (ViewPager) this.findViewById(R.id.viewpager);
viewPager.setAdapter(viewPagerAdapter);
}
}

public class ViewPagerAdapter extends PagerAdapter{

private Context context;
private List<View> views;

public ViewPagerAdapter(Context context, List<View> views){
this.context = context;
this.views = views;
}

@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView(views.get(position));
}

@Override
public Object instantiateItem(ViewGroup container, int position) {
container.addView(views.get(position));
return views.get(position);
}

@Override
public int getCount() {
return views.size();
}

@Override
public boolean isViewFromObject(View view, Object object) {
return (view == object);
}

}

//创建guide.xml

<?xml version="1.0" encoding="utf-8"?>
<?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">

<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#00000000"></android.support.v4.view.ViewPager>

<LinearLayout
android:id="@+id/ll"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:orientation="horizontal"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true">

</LinearLayout>
</RelativeLayout>

//创建3个引导页View
//one.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">

<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/guide_1"/>

</LinearLayout>

//two.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">

<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/guide_2"/>

</LinearLayout>

//three.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">

<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/guide_3"/>

</LinearLayout>

//修改AndroidManifest.xml

<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme" >
<activity android:name=".MainActivity" >
<!--<intent-filter>-->
<!--<action android:name="android.intent.action.MAIN" />-->

<!--<category android:name="android.intent.category.LAUNCHER" />-->
<!--</intent-filter>-->
</activity>
<activity android:name=".GuideActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

添加导航点

//讲解在ViewPager上添加页面滑动的导航点，用以表示当前ViewPager的索引。掌握如何使用点来标识ViewPager当前在哪一页中。
//修改guide.xml

<?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">

<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#00000000"></android.support.v4.view.ViewPager>

<LinearLayout
android:id="@+id/ll"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:orientation="horizontal"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true">

<ImageView
android:id="@+id/iv1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/login_point_selected" />

<ImageView
android:id="@+id/iv2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/login_point" />

<ImageView
android:id="@+id/iv3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/login_point" />
</LinearLayout>
</RelativeLayout>

//修改GuideActivity.java
//初始化导航点

private ImageView[] imageViews;
private int[] ids = {R.id.iv1, R.id.iv2, R.id.iv3};

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.guide);
initViews();
initDots();
}

private void initDots(){
imageViews = new ImageView[views.size()];
for (int i = 0; i < views.size(); i++){
imageViews[i] = (ImageView) findViewById(ids[i]);
}
}

//实现导航点监听方法

public class GuideActivity extends Activity implements ViewPager.OnPageChangeListener

//实现OnPageChangeListener方法
/**
* 当页面被滑动的时候进行调用
* @param position
* @param positionOffset
* @param positionOffsetPixels
*/
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

}

/**
* 当前新的页面被选中的时候调用
* @param position
*/
@Override
public void onPageSelected(int position) {
for (int i=0;i<ids.length;i++){
if (position == i){
imageViews[i].setImageResource(R.drawable.login_point_selected);
}else {
imageViews[i].setImageResource(R.drawable.login_point);
}
}
}

/**
* 当滑动状态改变的时候进行调用
* @param state
*/
@Override
public void onPageScrollStateChanged(int state) {

}

添加进入主界面按钮

//讲解了在ViewPager的最后一个页面添加上Button按钮用以提示用户进入程序，掌握如何在最后一个页面添加上Button。

//修改three.xml

<?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">

<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/guide_3" />

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:gravity="center_horizontal"
android:orientation="horizontal">

<Button
android:id="@+id/start_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="进入" />
</LinearLayout>

</RelativeLayout>

//修改GuideActivity.java

private Button startBtn;

private void initViews() {
LayoutInflater layoutInflater = LayoutInflater.from(this);
views = new ArrayList<View>();
views.add(layoutInflater.inflate(R.layout.one, null));
views.add(layoutInflater.inflate(R.layout.two, null));
views.add(layoutInflater.inflate(R.layout.three, null));

viewPagerAdapter = new ViewPagerAdapter(this, views);
viewPager = (ViewPager) this.findViewById(R.id.viewpager);
viewPager.setAdapter(viewPagerAdapter);
viewPager.setOnPageChangeListener(this);

startBtn = (Button) views.get(2).findViewById(R.id.start_btn);
startBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(GuideActivity.this, MainActivity.class);
startActivity(intent);
finish();
}
});
}

添加数据储存

//讲解了如何在首次打开程序进入引导页，之后进入主程序。掌握数据存储的使用，通过使用数据储存实现效果。
//新建Activity界面
//WelcomeActivity.java extendsActivity

public class WelcomeActivity extends AppCompatActivity {

private boolean isFirstIn = true;
private static final int DELAYED_TIME = 2000;
private static final int GO_HOME = 1000;
private static final int GO_GUIDE = 1001;

private Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
switch (msg.what){
case GO_HOME:
goHome();
break;
case GO_GUIDE:
goGuide();
break;
default:
break;
}
}
};

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_welcome);
init();
}

private void init(){
SharedPreferences sharedPreferences = getSharedPreferences("jike", MODE_PRIVATE);
isFirstIn = sharedPreferences.getBoolean("isFirstIn", true);
if (isFirstIn){
handler.sendEmptyMessageDelayed(GO_GUIDE, DELAYED_TIME);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putBoolean("isFirstIn", false);
editor.commit();
}else {
handler.sendEmptyMessageDelayed(GO_HOME,DELAYED_TIME);
}

}

private void goHome(){
Intent intent = new Intent(WelcomeActivity.this, MainActivity.class);
startActivity(intent);
finish();
}
private void goGuide(){
Intent intent = new Intent(WelcomeActivity.this, GuideActivity.class);
startActivity(intent);
finish();
}

}

//activity_welcome.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:orientation="vertical">

<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/welcome_android" />

</LinearLayout>

<activity android:name=".WelcomeActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

效果截图

源码下载：LearnViewPager