Android广告Banner实现

Android广告Banner实现

最近在做公司的东西，需要加入广告，之前也加得有广告，但是是第三方提供的SDK，鉴于项目需求，后台就写了一个广告系统，

这样我们客户端就得改了。花了一点时间，把广告的Banner实现了，这里面主要牵涉到了一些简单的知识，异步下载（图片和APK文件）

以及安装下载完成的APK，下面直接上代码吧。

//一些简单的变量 可以根据你个人情况选择

private ViewPager viewPager; // android-support-v4中的滑动组件

private List<ImageView> imageViews; // 滑动的图片集合

private List<View> dots; // 图片标题正文的那些点

private int currentItem = 0; // 当前图片的索引号

private ScheduledExecutorService scheduledExecutorService;

private int len = 0;

private final String SAVE_PATH = Environment.getExternalStorageDirectory()

+ "/cheesedownload/";

private RelativeLayout adsLayout;

private RelativeLayout ads_banner;

// 切换当前显示的图片

private Handler handler = new Handler() {

public void handleMessage(android.os.Message msg) {

viewPager.setCurrentItem(currentItem);// 切换当前显示的图片

};

};

//异步实现加载广告

class ShowAdsTask extends AsyncTask<String, Integer, String> {

List<AdsBean> list;

@Override

protected String doInBackground(String... params) {

// TODO Auto-generated method stub

return null;

}

@Override

protected void onPreExecute() {

// TODO Auto-generated method stub

super.onPreExecute();

list = DataFetcher.getAds(context, "banner");

if (list != null && list.size() != 0) {

ads_banner.setVisibility(View.VISIBLE);

adsLayout.setVisibility(View.VISIBLE);

showAds(list);

}

}

//广告显示函数

private void showAds(final List<AdsBean> list) {

imageViews = new ArrayList<ImageView>();

for (int i = 0; i < list.size(); i++) {

final int index = i;

len = list.get(index).getAdsCount();

ImageView imageView = new ImageView(this);

Bitmap bitmap = downloadAdsPic(list.get(index).getAdsPicUrl());

imageView.setImageBitmap(bitmap);

imageView.setScaleType(ScaleType.CENTER_CROP);

imageView.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

DownloadApkTask task = new DownloadApkTask(list.get(index)

.getAdsApkUrl(), list.get(index).getAdsName());

task.execute("");

}

});

imageViews.add(imageView);

}

dots = new ArrayList<View>();

LinearLayout layout = (LinearLayout) findViewById(R.id.ads_viewpage);

for (int i = 0; i < len; i++) {

View view = new View(this);

layout.addView(view);

dots.add(view);

}

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

viewPager.setAdapter(new MyAdapter());// 设置填充ViewPager页面的适配器

// 设置一个监听器，当ViewPager中的页面改变时调用

viewPager.setOnPageChangeListener(new MyPageChangeListener());

}

/**

* 打开安装apk

*/

private Handler downloadHandler = new Handler() {

@Override

public void handleMessage(Message msg) {

// TODO Auto-generated method stub

super.handleMessage(msg);

if (msg.what == 1) {

openFile(new File(SAVE_PATH + msg.obj + ".apk"));

}

}

};

/**

* 广告apk下载task

*

*/

class DownloadApkTask extends AsyncTask<String, Integer, String> {

String urlPath;

String name;

public DownloadApkTask(String urlPath, String name) {

// TODO Auto-generated constructor stub

this.urlPath = urlPath;

this.name = name;

}

@Override

protected String doInBackground(String... params) {

// TODO Auto-generated method stub

try {

apkDownload(urlPath, name);

Message msg = downloadHandler.obtainMessage();

msg.what = 1;

msg.obj = name;

downloadHandler.sendMessage(msg);

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return null;

}

}

@Override

protected void onStart() {

// TODO Auto-generated method stub

super.onStart();

scheduledExecutorService = Executors.newSingleThreadScheduledExecutor();

// 当Activity显示出来后，每两秒钟切换一次图片显示

scheduledExecutorService.scheduleAtFixedRate(new ScrollTask(), 1, 2,

TimeUnit.SECONDS);

super.onStart();

}

@Override

protected void onStop() {

// TODO Auto-generated method stub

super.onStop();

scheduledExecutorService.shutdown();

}

/**

* 换行切换任务

*

* @author Administrator

*

*/

private class ScrollTask implements Runnable {

public void run() {

synchronized (viewPager) {

currentItem = (currentItem + 1) % imageViews.size();

handler.obtainMessage().sendToTarget(); // 通过Handler切换图片

}

}

}

/**

* 当ViewPager中页面的状态发生改变时调用

*

* @author Administrator

*

*/

private class MyPageChangeListener implements OnPageChangeListener {

private int oldPosition = 0;

/**

* This method will be invoked when a new page becomes selected.

* position: Position index of the new selected page.

*/

public void onPageSelected(int position) {

currentItem = position;

oldPosition = position;

}

public void onPageScrollStateChanged(int arg0) {

}

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

}

}

/**

* 填充ViewPager页面的适配器

*

* @author Administrator

*

*/

private class MyAdapter extends PagerAdapter {

@Override

public int getCount() {

return len;

}

@Override

public Object instantiateItem(View arg0, int arg1) {

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

return imageViews.get(arg1);

}

@Override

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

((ViewPager) arg0).removeView((View) arg2);

}

@Override

public boolean isViewFromObject(View arg0, Object arg1) {

return arg0 == arg1;

}

@Override

public void restoreState(Parcelable arg0, ClassLoader arg1) {

}

@Override

public Parcelable saveState() {

return null;

}

@Override

public void startUpdate(View arg0) {

}

@Override

public void finishUpdate(View arg0) {

}

}

/**

* apk文件下载

*

* @param url

* @param name

* @throws IOException

*/

public void apkDownload(String url, String name) throws IOException {

try {

byte[] buffer = new byte[1024];

int len = 0;

DefaultHttpClient client = new DefaultHttpClient();

HttpGet get = new HttpGet(url);

HttpResponse response = client.execute(get);

StatusLine statusline = response.getStatusLine();

if (statusline.getStatusCode() == HttpStatus.SC_OK) {

HttpEntity entity = response.getEntity();

InputStream is = entity.getContent();

File file = new File(SAVE_PATH);

if (!file.exists()) {

file.mkdir();

}

File apk_file = new File(SAVE_PATH + name + ".apk");

if (!apk_file.exists())

apk_file.createNewFile();

FileOutputStream fos = new FileOutputStream(apk_file);

while ((len = is.read(buffer)) != -1) {

fos.write(buffer, 0, len);

}

fos.flush();

fos.close();

is.close();

}

} catch (MalformedURLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

/**

* 安装APK文件

*

* @param file

*/

private void openFile(File file) {

// TODO Auto-generated method stub

Intent intent = new Intent();

intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

intent.setAction(android.content.Intent.ACTION_VIEW);

intent.setDataAndType(Uri.fromFile(file),

"application/vnd.android.package-archive");

startActivity(intent);

}

/**

* 下载广告图片

*

* @param urlPath

* @return

*/

private Bitmap downloadAdsPic(String urlPath) {

Bitmap bitmap = null;

try {

URL url = new URL(urlPath);

// 打开盖URL对应的资源的输入流

InputStream is = url.openStream();

// 从inputstream中解析图片

bitmap = BitmapFactory.decodeStream(is);

is.close();

// 再次打开URL对应的资源输入流

is = url.openStream();

// 打开手机对应文件的输出流

OutputStream os = openFileOutput("image.jpg", MODE_WORLD_READABLE);

byte[] buff = new byte[1024];

int hasread = 0;

// 将URL资源下载到本地

while ((hasread = is.read(buff)) > 0) {

os.write(buff, 0, hasread);

}

is.close();

os.close();

} catch (Exception ex) {

ex.printStackTrace();

}

return bitmap;

}

ad_banner.xml

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

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:id="@+id/ads_banner"

android:visibility="gone"

android:layout_width="wrap_content"

android:layout_height="wrap_content" >

<LinearLayout

android:id="@+id/adview_container"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:gravity="center_horizontal" >

<FrameLayout

android:layout_width="fill_parent"

android:layout_height="50dip" >

<android.support.v4.view.ViewPager

android:id="@+id/vp"

android:layout_width="fill_parent"

android:layout_height="fill_parent" />

<LinearLayout

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_gravity="bottom"

android:gravity="center"

android:orientation="vertical" >

<LinearLayout

android:id="@+id/ads_viewpage"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginTop="3dip"

android:gravity="center"

android:orientation="horizontal" >

</LinearLayout>

</LinearLayout>

</FrameLayout>

</LinearLayout>

</RelativeLayout>