java

Question: Right now I have a very secret number in my client application. It lies in the resources, strings.xml , we urgently need to come up with something so that the picking hackers cannot find anything, or at least stop their atrocities 🙂 This number consists of 50 digits, it …

java – How to hide secret number from decompilers in android application? Read More »

Question: I draw like this: Bitmap bitmap = Bitmap.createBitmap(w, w, Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(bitmap); canvas.drawARGB(1, 178, 229, 255); Paint p = new Paint(Paint.ANTI_ALIAS_FLAG); p.setColor(Color.BLACK); p.setStyle(Paint.Style.STROKE); p.setStrokeWidth(1); canvas.drawCircle(400, 400, 100, p); There is a component: ImageView iv = (ImageView) findViewById(R.id.iv); How now to display the drawn on the screen …

java – How to display the drawn image in ImageView? Read More »

Question: If I do: float a=5; System.out.printf(“%d”, a); Its output will be: 5.000000 How do I print 5.000000 ? That is, I want to replace the comma with a period. Answer: Maybe this will help you: import java.text.DecimalFormat; import java.text.DecimalFormatSymbols; import java.text.NumberFormat; import java.util.Locale; public class Teste { public static …

java – How to print a decimal number with dot, not comma? Read More »

Question: Question: I'm trying to use the overloaded methods provided by the Java library in Scala. class X{ public <E> void f(E… values){ System.out.println(1); } public void f(Object value){ System.out.println(2); } } However, in Scala, if the parameter types are compatible, you will not be able to resolve which of …

java – How to explicitly resolve overloaded method ambiguity in Scala? Read More »

Question: There is a Java generics class like: public class MyClass<T> { static long myField=System.currentTimeMillis(); //blah-blah } Two objects are created: MyClass<String> var1=new MyClass<String>(); MyClass<Integer> var2=new MyClass<Integer>(); question: are var1.myField and var2.myField the same? update And if it is a template in C++/C# – then will they be the same …

java – Static field in generics/template Read More »

Question: There is a String code; it contains the code of one method. Can it be done with some libraries or some other way? Thanks in advance! Answer: If you have javac on hand, you can compile it and call it by reflection. No other way.

Question: A variable is created BigDecimal bet = new BigDecimal(0.00000010) and passed to the server and it returns a different value than expected. It is not clear why this is so. Answer: When using a constructor that takes double as input, an unpleasant feature occurs, noted in the documentation. Since …

java – Bigdecimal precision loss Read More »

Question: What I'm trying to do is move from one fragment to another when a button is pressed, the code I'm using is: public class DimensionFragment extends Fragment { Button Bmeters, Bfeet; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment //return …

java – Switch from one fragment to another by means of a button Read More »

Question: It happens that I have an Edit Text of type textPersonName and when I pass the focus to another Edit Text of type date it shows me the virtual keyboard but I want it not to be shown, since instead I want a dialog to be shown that contains …

java – How to prevent an Android EditText from showing the keyboard when it receives focus (without disabling the control)? Read More »

Question: I am trying to get the screen dimensions of an Android device, I am trying with this code: Display display = getWindowManager().getDefaultDisplay(); int width = display.getWidth(); // obsoleto (deprecated) int height = display.getHeight(); // obsoleto (deprecated) Which is obsolete (deprecated), what would be the current correct way to obtain …

java – How to get screen dimensions in Android? Read More »