圖片發(fā)自簡書App

1、引入android-support-v4.jar包，在主布局里加入

< ?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"

android:orientation="vertical"

android:id="@+id/layout"

tools:context="com.zjq.viewpager.MainActivity">

< android.support.v4.view.ViewPager

android:id="@+id/viewPager"

android:layout_width="match_parent"

android:layout_height="wrap_content">

< /android.support.v4.view.ViewPager>

< LinearLayout

android:id="@+id/viewGroup"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_alignParentBottom="true"

android:layout_marginBottom="40dp"

android:gravity="center_horizontal"

android:orientation="horizontal" >

< /LinearLayout>

< /RelativeLayout >

其他幾個(gè)子布局都一樣 例如 item01 :

< ?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">

< ImageView

android:layout_width="match_parent"

android:layout_height="match_parent"

android:src="@drawable/view1"

android:scaleType="centerCrop"

/>

2、加載切換內(nèi)容

3、ViewPager加載適配器PagerAdapter

public class MainActivity extends Activity {

private ViewPager viewPager;

private ArrayList pageview;

private ImageView imageView;

private ImageView[] imageViews;

//包裹點(diǎn)點(diǎn)的LinearLayout

private ViewGroup group;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

//設(shè)置無標(biāo)題欄

requestWindowFeature(Window.FEATURE_NO_TITLE);

setContentView(R.layout.activity_main);

viewPager = (ViewPager) findViewById(R.id.viewPager);

//查找布局文件用LayoutInflater.inflate

LayoutInflater inflater =getLayoutInflater();

View view1 = inflater.inflate(R.layout.item01, null);

View view2 = inflater.inflate(R.layout.item02, null);

View view3 = inflater.inflate(R.layout.item03, null);

View view4 = inflater.inflate(R.layout.item04, null);

//將view裝入數(shù)組

pageview =new ArrayList();

pageview.add(view1);

pageview.add(view2);

pageview.add(view3);

pageview.add(view4);

group = (ViewGroup)findViewById(R.id.viewGroup);

//有多少張圖就有多少個(gè)點(diǎn)點(diǎn)

imageViews = new ImageView[pageview.size()];

for(int i =0;i

imageView = new ImageView(MainActivity.this);

imageView.setLayoutParams(new LayoutParams(20,20));

imageView.setPadding(20, 0, 20, 0);

imageViews[i] = imageView;

//默認(rèn)第一張圖顯示為選中狀態(tài)

if (i == 0) {

imageViews[i].setBackgroundResource(R.drawable.page_indicator_focused);

} else {

imageViews[i].setBackgroundResource(R.drawable.page_indicator_unfocused);

}

group.addView(imageViews[i]);

}

//綁定適配器

viewPager.setAdapter(mPagerAdapter);

//綁定監(jiān)聽事件

viewPager.setOnPageChangeListener(new GuidePageChangeListener());

}

//數(shù)據(jù)適配器

PagerAdapter mPagerAdapter = new PagerAdapter(){

@Override

//獲取當(dāng)前窗體界面數(shù)

public int getCount() {

// TODO Auto-generated method stub

return pageview.size();

}

@Override

//斷是否由對象生成界面

public boolean isViewFromObject(View arg0, Object arg1) {

// TODO Auto-generated method stub

return arg0==arg1;

}

//是從ViewGroup中移出當(dāng)前View

public void destroyItem(View arg0, int arg1, Object arg2) {

((ViewPager) arg0).removeView(pageview.get(arg1));

}

//返回一個(gè)對象，這個(gè)對象表明了PagerAdapter適配器選擇哪個(gè)對象放在當(dāng)前的ViewPager中

public Object instantiateItem(View arg0, int arg1){

((ViewPager)arg0).addView(pageview.get(arg1));

return pageview.get(arg1);

}

};

//pageView監(jiān)聽器

class GuidePageChangeListener implements OnPageChangeListener{

@Override

public void onPageScrollStateChanged(int arg0) {

// TODO Auto-generated method stub

}

@Override

public void onPageScrolled(int arg0, float arg1, int arg2) {

// TODO Auto-generated method stub

}

@Override

//如果切換了，就把當(dāng)前的點(diǎn)點(diǎn)設(shè)置為選中背景，其他設(shè)置未選中背景

public void onPageSelected(int arg0) {

// TODO Auto-generated method stub

for(int i=0;i

imageViews[arg0].setBackgroundResource(R.drawable.page_indicator_focused);

if (arg0 != i) {

imageViews[i].setBackgroundResource(R.drawable.page_indicator_unfocused);

}

}

}

} }

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