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Android中获取网络图片的方法(如果手机缓存里面有就从缓存获取)
https://doinone.iteye.com/blog/1074366
// 如果缓存里面有就从缓存获取，否则网络获取图片，返回Drawable对象
public static Drawable loadImageFromNetwork(Context context, String imageUrl)
{
Drawable drawable = null;
if(imageUrl == null )
return null;
String imagePath = "";
String fileName = "";
// 获取url中图片的文件名与后缀
if(imageUrl!=null&&imageUrl.length()!=0){
fileName = imageUrl.substring(imageUrl.lastIndexOf("/")+1);
}
// 图片在手机本地的存放路径,注意：fileName为空的情况
imagePath = context.getCacheDir() + "/" + fileName;
Log.i("test","imagePath = " + imagePath);
File file = new File(context.getCacheDir(),fileName);// 保存文件
Log.i("test","file.toString()=" + file.toString());
if(!file.exists()&&!file.isDirectory())
{
try {
// 可以在这里通过文件名来判断，是否本地有此图片
FileOutputStream fos=new FileOutputStream( file );
InputStream is = new URL(imageUrl).openStream();
int data = is.read();
while(data!=-1){
fos.write(data);
data=is.read();;
}
fos.close();
is.close();
// drawable = Drawable.createFromStream(
// new URL(imageUrl).openStream(), file.toString() ); // (InputStream) new URL(imageUrl).getContent();
drawable = Drawable.createFromPath(file.toString());
Log.i("test", "file.exists()不文件存在，网上下载:" + drawable.toString());
} catch (IOException e) {
Log.d("test", e.getMessage());
}
}else
{
drawable = Drawable.createFromPath(file.toString());
Log.i("test", "file.exists()文件存在，本地获取");
}
if (drawable == null) {
Log.d("test", "null drawable");
} else {
Log.d("test", "not null drawable");
}
return drawable ;
}
最后更新：2017-04-02 22:16:38