我收到异常“无法在函数 doFirstTime() 中未调用 Looper.prepare() 的线程内创建处理程序。我正在尝试使用 Dropbox API 在 Dropbox 上传我的数据你能告诉我如何解决吗？
public class DownloadFile extends AsyncTask<Void, Long, Boolean>
`{
private Context mContext;
private DropboxAPI<?> mApi;
private String mPath;
private FileOutputStream mFos;
private String mErrorMsg;
private StringBuilder xmlcode,newXMLCode;
private final static String FILE_NAME = "fuelrecords.xml";
private final static String ZIP_FILE_NAME = "fuelpad.zip";
private String dropbox_xml_records[];
private ArrayList<ArrayList<String>> dropbox_records;
private ArrayList<ArrayList<String>> database_records;
private ExpenseOperations eop;
private UploadFile up;
private boolean no_file;
public DownloadFile(Context context, DropboxAPI<?> api,String dropboxPath)
{
// We set the context this way so we don't accidentally leak activities
mContext = context.getApplicationContext();
mApi = api;
mPath = dropboxPath;
dropbox_records = new ArrayList<ArrayList<String>>();
database_records = new ArrayList<ArrayList<String>>();
eop = new ExpenseOperations(mContext);
xmlcode=new StringBuilder("");
newXMLCode=new StringBuilder("");
no_file = false;
}
@Override
protected Boolean doInBackground(Void... params)
{
Log.d("yes1", " in do in back of download..");
try
{
// Get the metadata for a directory
Entry dirent = mApi.metadata(mPath, 1000, null, true, null);
if (!dirent.isDir || dirent.contents == null)
{
// It's not a directory, or there's nothing in it
mErrorMsg = "Could not locate the file...";
return false;
}
String cachefilePath = mContext.getCacheDir().getAbsolutePath() + "/" + FILE_NAME;
String cachezipPath = mContext.getCacheDir().getAbsolutePath() + "/" + ZIP_FILE_NAME;
try
{
mFos = new FileOutputStream(cachezipPath);
}
catch (FileNotFoundException e)
{
mErrorMsg = "Couldn't create a local file to store the image";
return false;
}
Notification("SmartExpense", "Now syncing to dropbox");
mApi.getFile("/SmartExpenses.zip",null,mFos,null);
try
{
FileInputStream fin = new FileInputStream(cachezipPath);
ZipInputStream zin = new ZipInputStream(fin);
ZipEntry ze = null;
if((ze = zin.getNextEntry()) != null)
{
Log.v("Decompress", "Unzipping " + ze.getName());
if(ze.isDirectory())
{
}
else
{
FileOutputStream fout = new FileOutputStream(cachefilePath);
for (int c = zin.read(); c != -1; c = zin.read())
{
fout.write(c);
}
zin.closeEntry();
fout.close();
}
}
zin.close();
}
catch(Exception ee)
{
Log.d("In unzip:", ""+ee);
}
try
{
FileInputStream fs =new FileInputStream(cachefilePath);
byte buff[] =new byte[1024];
while(fs.read(buff)>0)
{
xmlcode.append(new String(buff));
}
fs.close();
Log.d("Hhhhhhhhhhhaaaaaaaaaaaaa : ",""+xmlcode);
Looper.prepare();
if(!(xmlcode.toString().contains("<expenserecord>")) && getDBRecords())
{
doFirstTime();
Log.d("1","1");
}
else if((xmlcode.toString().contains("<expenserecord>")) && getDBRecords())
{
Log.d("2","2");
makeDropboxRecordArray();
performSync();
}
else if((xmlcode.toString().contains("<expenserecord>")) && !getDBRecords())
{
Log.d("3","3");
makeDropboxRecordArray();
fillDBwithDropboxRecords();
}
else if(!(xmlcode.toString().contains("<expenserecord>")) && !getDBRecords())
{
Log.d("4","4");
mErrorMsg ="No records exist to sync";
}
}
catch (Exception e)
{
Log.d("Exception in doback: ",""+e);
}
return true;
}
catch (DropboxUnlinkedException e)
{
mErrorMsg = "Error :Dropbox unliked";
// The AuthSession wasn't properly authenticated or user unlinked.
}
catch (DropboxPartialFileException e)
{
// We canceled the operation
mErrorMsg = "Download canceled";
}
catch (DropboxServerException e)
{
// Server-side exception. These are examples of what could happen,
// but we don't do anything special with them here.
if (e.error == DropboxServerException._304_NOT_MODIFIED)
{
mErrorMsg = "Server Error.....";
// won't happen since we don't pass in revision with metadata
}
else if (e.error == DropboxServerException._401_UNAUTHORIZED)
{
mErrorMsg = "Server Error : Unautherized user...";
// Unauthorized, so we should unlink them. You may want to
// automatically log the user out in this case.
}
else if (e.error == DropboxServerException._403_FORBIDDEN)
{
mErrorMsg = "Server Error : Access denied";
// Not allowed to access this
}
else if (e.error == DropboxServerException._404_NOT_FOUND)
{
no_file = true;
doFirstTime();
// path not found
}
else if (e.error == DropboxServerException._406_NOT_ACCEPTABLE)
{
mErrorMsg = "Server Error : Congestion...";
// too many entries to return
}
else if (e.error == DropboxServerException._507_INSUFFICIENT_STORAGE)
{
// user is over quota
mErrorMsg = "Server Error : Insufficient Storage...";
}
else
{
// Something else
mErrorMsg = "Server Error...";
}
// This gets the Dropbox error, translated into the user's language
mErrorMsg = e.body.userError;
if (mErrorMsg == null)
{
mErrorMsg = e.body.error;
}
}
catch (DropboxIOException e)
{
// Happens all the time, probably want to retry automatically.
mErrorMsg = "Network error. Try again.";
}
catch (DropboxParseException e)
{
// Probably due to Dropbox server restarting, should retry
mErrorMsg = "Dropbox error. Try again.";
}
catch (DropboxException e)
{
// Unknown error
mErrorMsg = "Unknown error. Try again.";
}
return false;
}
public void fillDBwithDropboxRecords()
{
Log.d("In fill db","yetoy");
try
{
for(int i=0 ; i<dropbox_records.size()-1 ; i++)
{
{
eop.addRecord(Integer.parseInt(dropbox_records.get(i).get(0)), dropbox_records.get(i).get(1), dropbox_records.get(i).get(2), Integer.parseInt(dropbox_records.get(i).get(3)));
}
}
}
catch (Exception e)
{
Log.d("In fill db", ""+e);
}
}
private void doFirstTime()
{
Log.d("yes2", " in do first time of download..");
try
{
if(!getDBRecords())
{
mErrorMsg = "No records exist to sync";
return;
}
newXMLCode.append("<smartexpense>");
for(int i=0 ; i<database_records.size() ; i++)
{
newXMLCode.append("<expenserecord>");
newXMLCode.append("<c_id>"+database_records.get(i).get(0)+"</c_id>");
newXMLCode.append("<title>"+database_records.get(i).get(1)+"</title>");
newXMLCode.append("<date>"+database_records.get(i).get(2)+"</date>");
newXMLCode.append("<amount>"+database_records.get(i).get(3)+"</amount>");
newXMLCode.append("</expenserecord>");
}//for
newXMLCode.append("</smartexpense>");
up = new UploadFile(mContext,mApi,newXMLCode.toString());
up.execute();
}
catch(Exception e)
{
Log.d("Exception in doFirtstTime : ",""+e);
}
}//doFirstTime
public void makeDropboxRecordArray()
{
Log.d("yes3", " in make record array of download..");
try
{
dropbox_xml_records = (xmlcode.toString()).split("</expenserecord>");
for(int i=0 ; i< dropbox_xml_records.length ; i++)
{
dropbox_records.add(new ArrayList<String>());
dropbox_records.get(i).add(dropbox_xml_records[i].substring(
((dropbox_xml_records[i].indexOf("<c_id>"))+
("<c_id>".length())),
dropbox_xml_records[i].indexOf("</c_id>")
));
dropbox_records.get(i).add(dropbox_xml_records[i].substring(
((dropbox_xml_records[i].indexOf("<title>"))+
("<title>".length())),
dropbox_xml_records[i].indexOf("</title>")
));
dropbox_records.get(i).add(dropbox_xml_records[i].substring(
((dropbox_xml_records[i].indexOf("<date>"))+
("<date>".length())),
dropbox_xml_records[i].indexOf("</date>")
));
dropbox_records.get(i).add(dropbox_xml_records[i].substring(
((dropbox_xml_records[i].indexOf("<amount>"))+
("<amount>".length())),
dropbox_xml_records[i].indexOf("</amount>")
));
}
}
catch (Exception e)
{
Toast.makeText(mContext,"In fill records :"+e , 2000).show();
}
}
public boolean getDBRecords()
{
Log.d("yes4", " in get dbrecords of download..");
try
{
Cursor cc = eop.getRecords();
if(cc.getCount() == 0)
return false;
int i=0;
if(cc.moveToFirst())
{
do
{
database_records.add(new ArrayList<String>());
database_records.get(i).add(cc.getString(cc.getColumnIndex("c_id")));
database_records.get(i).add(cc.getString(cc.getColumnIndex("title")));
database_records.get(i).add(cc.getString(cc.getColumnIndex("date")));
database_records.get(i).add(cc.getString(cc.getColumnIndex("amount")));
i++;
}while(cc.moveToNext());
}
cc.close();
}
catch(Exception ee)
{
Toast.makeText(mContext,"getDBRecords :"+ee , 2000).show();
}
return true;
}
public void performSync()
{
try
{
//compare database records with dropbox records
newXMLCode.append("<smartexpense>");
for(int i=0 ; i<database_records.size() ; i++)
{
newXMLCode.append("<expenserecord>");
newXMLCode.append("<c_id>"+database_records.get(i).get(0)+"</c_id>");
newXMLCode.append("<title>"+database_records.get(i).get(1)+"</title>");
newXMLCode.append("<date>"+database_records.get(i).get(2)+"</date>");
newXMLCode.append("<amount>"+database_records.get(i).get(3)+"</amount>");
newXMLCode.append("</expenserecord>");
}
for(int i=0 ; i<dropbox_records.size()-1 ; i++)
{
eop.addRecord(Integer.parseInt(dropbox_records.get(i).get(0)),
dropbox_records.get(i).get(1),
dropbox_records.get(i).get(2),
Integer.parseInt(dropbox_records.get(i).get(3)));
newXMLCode.append("<expenserecord>");
newXMLCode.append("<c_id>"+dropbox_records.get(i).get(0)+"</c_id>");
newXMLCode.append("<title>"+dropbox_records.get(i).get(1)+"</title>");
newXMLCode.append("<date>"+dropbox_records.get(i).get(2)+"</date>");
newXMLCode.append("<amount>"+dropbox_records.get(i).get(3)+"</amount>");
newXMLCode.append("</expenserecord>");
}
//}
newXMLCode.append("</smartexpense>");
Log.d("Comming : ","yetoy..");
up = new UploadFile(mContext,mApi,newXMLCode.toString());
up.execute();
}
catch (Exception e)
{
Log.d("Perform sync: ",""+e);
}
}
@Override
protected void onPostExecute(Boolean result)
{
//mDbHelper.close();
if (result)
{
//showToast("File successfully downloaded");
}
else
{
if(!no_file)
{
// Couldn't download it, so show an error
showToast("Error in sync.Check notification.");
Notification("SmartExpense", mErrorMsg);
}
}
}
private void showToast(String msg)
{
Toast error = Toast.makeText(mContext, msg, Toast.LENGTH_LONG);
error.show();
}
// Notification Function
private void Notification(String notificationTitle, String notificationMessage)
{
NotificationManager notificationManager = (NotificationManager)mContext.getSystemService(Context.NOTIFICATION_SERVICE);
Notification notification = new Notification(android.R.drawable.ic_menu_save, "Dropbox Sync", System.currentTimeMillis());
Intent notificationIntent = new Intent(mContext, UploadFile.class);
PendingIntent pendingIntent = PendingIntent.getActivity(mContext, 0, notificationIntent, 0);
notification.setLatestEventInfo(mContext, notificationTitle, notificationMessage, pendingIntent);
notificationManager.notify(10001, notification);
}
}