三级缓存02
//缓存到手机SD卡，封装成一个类
public class LocalCache {
public void putImage(String imageUrl, Bitmap bitmap) throws Exception {
String newImage = MD5Unit.encode(imageUrl);
Log.e("newImage", newImage);
File file = new File(Environment.getExternalStorageDirectory() + "/BCache/" + newImage);
Log.e("看看目录结构", file.getAbsolutePath());
File parentFile = file.getParentFile();
Log.e("看看文件的父目录", parentFile.getAbsolutePath());
if (!parentFile.exists()) {
parentFile.mkdirs();
}
FileOutputStream fos = new FileOutputStream(file);
//Bitmap可以直接跟IO流就行直接交互
//compress 有三个参数，参数1：图片格式 参数2：对原图片进行压缩，参数3：流
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
Log.e("-----", "图片写入成功 66哒");
fos.flush();
fos.close();
}
public Bitmap getImage(String imageUrl) throws Exception {
String newImage = MD5Unit.encode(imageUrl);
File file = new File(Environment.getExternalStorageDirectory() + "/BCache/" + newImage);
InputStream in = new FileInputStream(file);
Log.e("获取图片", "成功么么哒");
return BitmapFactory.decodeStream(in);
}
}
//获取到手机内存中，封装成一个类
public class PhoneCache { private LruCachemLru; private Context mContext; public PhoneCache(Context context) { this.mContext = context; //得到一个可以管理手机内存操作者的类 ActivityManager manager = (ActivityManager) mContext.getSystemService(Context.ACTIVITY_SERVICE); //得到手机内存空间大小，单位是m int memoryClass = manager.getMemoryClass(); Log.e("memoryClass", memoryClass + "m"); //因为等会我们实例化LRUCache是构造方法里面参数是字节类型所有要吧m转换成b int maxSize = memoryClass * 1024 * 1024 / 8; Log.e("maxSize", maxSize + "by"); mLru = new LruCache(maxSize) {
@Override
protected int sizeOf(String key, Bitmap value) {
//计算图片的大小
return value.getRowBytes() * value.getHeight();
}
};
}
//存放图片和得到图片
public void putImage(String url, Bitmap b) {
mLru.put(url, b);
Log.e("存放", "存放成功");
}
public Bitmap getImage(String url) {
Log.e("获取", "获取成功");
return mLru.get(url);
}
}
