//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);

}

}