对下载文件是否完整的判断方法

mMusicSourceFile = new File(MUSIC_FILE_PATH, mCurrentPlayMusic.getMusicName()+".tmp"); //按照SourceFile下载
mMusicDescFile = new File(MUSIC_FILE_PATH, mCurrentPlayMusic.getMusicName());

mClient.downloadFile(new HttpGet(mCurrentPlayMusic.getMusicPath()), mMusicSourceFile)

//下载成功后
mMusicSourceFile.renameTo(mMusicDescFile);

int len, mHasRead = 0;
byte[] buffer = new byte[8192];
final long size = response.getEntity().getContentLength();

BufferedOutputStream outputStream = null;
InputStream inputStream = response.getEntity().getContent();
try {
　　outputStream = new BufferedOutputStream(new FileOutputStream(mFile));

　　while (!Thread.interrupted() && (len = inputStream.read(buffer)) != -1) {
　　　　outputStream.write(buffer, 0, len);
　　　　mHasRead += len;
　　}
　　outputStream.flush();

　　return mHasRead == size;
} finally {
if (outputStream != null)
　　outputStream.close();
　　if (inputStream != null)
　　inputStream.close();
}