我正在尝试在文件夹中的SD 卡上备份我的收件箱短信。但我无法在SD 卡上创建文件夹我正在使用此代码
backup=(Button)findViewById(R.id.backup);
backup.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
backupSMS();
}
public ArrayList<String> smsBuffer = new ArrayList<String>();
String smsFile = "SMS-" + SystemClock.currentThreadTimeMillis() + ".csv";
private void backupSMS() {
smsBuffer.clear();
Uri mSmsinboxQueryUri = Uri.parse("content://sms/inbox");
Cursor cursor1 = getContentResolver().query(
mSmsinboxQueryUri,
new String[] { "_id", "thread_id", "address", "person", "date",
"body", "type" }, null, null, null);
//startManagingCursor(cursor1);
String[] columns = new String[] { "_id", "thread_id", "address", "person", "date", "body",
"type" };
if (cursor1.getCount() > 0) {
String count = Integer.toString(cursor1.getCount());
Log.d("Count",count);
while (cursor1.moveToNext()) {
String messageId = cursor1.getString(cursor1
.getColumnIndex(columns[0]));
String threadId = cursor1.getString(cursor1
.getColumnIndex(columns[1]));
String address = cursor1.getString(cursor1
.getColumnIndex(columns[2]));
String name = cursor1.getString(cursor1
.getColumnIndex(columns[3]));
String date = cursor1.getString(cursor1
.getColumnIndex(columns[4]));
String msg = cursor1.getString(cursor1
.getColumnIndex(columns[5]));
String type = cursor1.getString(cursor1
.getColumnIndex(columns[6]));
smsBuffer.add(messageId + ","+ threadId+ ","+ address + "," + name + "," + date + " ," + msg + " ,"
+ type);
}
generateCSVFileForSMS(smsBuffer);
}
}
private void generateCSVFileForSMS(ArrayList<String> list)
{
try
{
String storage_path = Environment.getExternalStorageDirectory().toString() + File.separator + smsFile;
FileWriter write = new FileWriter(storage_path);
write.append("messageId, threadId, Address, Name, Date, msg, type");
write.append('\n');
write.append('\n');
for (String s : list)
{
write.append(s);
write.append('\n');
}
write.flush();
write.close();
}
catch (NullPointerException e)
{
System.out.println("Nullpointer Exception "+e);
// e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
catch (Exception e)
{
e.printStackTrace();
}
}
});
使用此代码,我可以备份但不能在文件夹中。请帮助我,我是 android 新手,在此先感谢