Questions tagged as 'java'

Tagged questions
2
answers

Problem when counting with decimals on Android

I want to get 5% of any number and it has occurred to me in the following way: public class Main4Activity extends AppCompatActivity { EditText uno; TextView tres, tresinvisible, multiplica, divide, haciendocuenta, haciendocuenta2;...
asked by 18.05.2017 / 00:02
2
answers

Add content to a file without overwriting the content

I would like to be able to solve the doubt of how to make it possible that when restarting the console do not overwrite and continue writing at the end of the line: import java.io.*; public class RedirectSystemOut { public static void main(...
asked by 09.05.2017 / 10:57
2
answers

Up and down volume of an audio channel with the physical buttons on Android

I would like to synchronize the physical buttons of volume up and down synchronized with a specific audio channel. When clicking, the dialogue of the image will be shown, with the seekbar icon and increase or decrease the volume.     
asked by 15.05.2017 / 13:40
2
answers

What is the difference between StringBuilder and StringBuffer? in Java

I think StringBuilder and StringBuffer in Java have the same functionality. What is the main difference?     
asked by 20.05.2017 / 21:00
1
answer

Assign different actions to a Floating Button on Android

I have a FloatingActionButton general and 3 Fragments that are loaded with a ViewPager Following the Google Design Guide , show that FloatingActionButton is in parent and not in each fragment video: lin...
asked by 21.07.2018 / 09:21
1
answer

How to detect the user's language and do one thing or another?

I just need to know if it's English go to url2 and if it's Spanish url. I have some layout with strings in Spanish and English and I know how to use them so that it comes out depending on the language of the user, but being a URL, I am not able...
asked by 05.02.2017 / 09:09
3
answers

Writing arraysList in txt java files

I am trying to write an arrayList in a text file with this function: String ruta = "C:\Users\usuario\Desktop\archivo1.txt"; File f = new File(ruta); FileWriter fw = new FileWriter(f); BufferedWriter escritura = new BufferedWrit...
asked by 16.02.2017 / 11:04
1
answer

SQLite and listView does not list

It shows me the following: And the logCAT: The app consists of showing the business of my town in a listView. The Business class I have the getter and setters methods. I have the class: public class NegociosDBOpenHelper...
asked by 15.10.2018 / 14:26
1
answer

Save images in SQLite? [closed]

I wanted to know how to save images (business photos) in the SQLite database. I'm with an app that shows all the businesses in the city where I live. This is the code that creates the table: public static final String TABLE_CREATE =...
asked by 17.10.2018 / 16:12
2
answers

Convert Integer to String, with leading zeros?

I'm manipulating dates, and I need to convert ints to String without losing the number in front. That is, 01, 02, 03, 04 I've tried String.valueOf() and Integer.ToString() , but it eliminates the zero on the left thanks in...
asked by 28.10.2018 / 19:48