Android中通过url获取图片Bitmap

Android中通过url获取图片Bitmap

这里直接上代码：

/**
* Author:FounderWatts
* context:调用方上下文，Activity.this
* urlStr:指定的网址，如：“http://www.baidu.com”
* */
public Bitmap getBitmapFromUrl(Context context,String urlStr){
URL url = null;
Bitmap bitmap = null;
HttpURLConnection connection = null;
try{
url = new URL(urlStr);
connection = (HttpURLConnection)url.openConnection();
connection.setReadTimeout(5000);
connection.setConnectTimeout(5000);

InputStream inputStream = new BufferedInputStream(connection.getInputStream());
bitmap = BitmapFactory.decodeStream(inputStream);
inputStream.close();

}catch (Exception e){
e.printStackTrace();
Resources resources = context.getResources();
bitmap = BitmapFactory.decodeResource(resources, R.drawable.ic_launcher);
}finally {
connection.disconnect();
}
return bitmap;
}

注意到整个方法中没有声明 connection.connect(); 现在大部分的说法是在必要的情况下connect()方法会被隐式调用，不过我查看API源码，发现HttpURLConnection本身也是继承自URLConnection的抽象类，它并没有实现connect()抽象方法。至于具体connect()的调用情况我将尽快在我后面的博客给出。