我希望使用Google Drive Android API将Google Drive中的“.ppt”文件制作成本地副本（外部存储）。
我正在读取一个字节并将其写入我的本地文件。但是，当我尝试打开它时，显示文件已损坏。请帮助我解决这个问题。
我正在读取一个字节并将其写入我的本地文件。但是，当我尝试打开它时，显示文件已损坏。请帮助我解决这个问题。
final DriveFile file = Drive.DriveApi.getFile(getClient(), fileid);
final Metadata[] metadata = new Metadata[1];
file.getMetadata(getClient())
.setResultCallback(new ResultCallback<DriveResource.MetadataResult>() {
@Override
public void onResult(DriveResource.MetadataResult metadataResult) {
metadata[0] = metadataResult.getMetadata();
L.b(EditorWindow.this, metadata[0].getMimeType(), 0);
}
});
file.open(getClient(), DriveFile.MODE_READ_ONLY, null)
.setResultCallback(new ResultCallback<DriveApi.DriveContentsResult>() {
@Override
public void onResult(DriveApi.DriveContentsResult result) {
if (!result.getStatus().isSuccess()) {
L.c("Error in creating new file");
return;
}
DriveContents contents = result.getDriveContents();
String filename = metadata[0].getTitle();
File localFile = new File(Environment.getExternalStorageDirectory(), filename);
OutputStream out = null;
InputStream in = null;
try {
out = new BufferedOutputStream(new FileOutputStream(localFile));
in = contents.getInputStream();
int b;
while ( (b = in.read()) > 0) {
out.write(b);
}
in.close();
out.close();
} catch (Exception e) {L.c("Error in writing to SD card");}
contents.discard(getClient());
}
});