We Keep Coding

Convert from Android color to HTML color

I want to know how this conversion could be done:
I've checked that the following instruction:
int color= ((ColorDrawable) dialog1.getButton(AlertDialog.BUTTON_POSITIVE).getBackground()).getColor();
Gives in some devices the result color=-12434878, it's checked that the color is equivalent to the HTML color #424242.
But point is I see no way for transforming from one to the other and neither I find any reference for this.
How could this be done?

Convert integer to hex String
Integer intColor = -12434878;
String hexColor = "#" + Integer.toHexString(intColor).substring(2);

getDrawable (int) in Context cannot be applied to (java.lang.String) [duplicate]

This question already has answers here:
How to get a resource id with a known resource name?
(10 answers)
Closed 4 years ago.
Here's the code:
String id = "R.drwable.br" + mQuestionNumber;
mSlikaNastavi.setImageDrawable(getDrawable(id));
error found on getDrawable(id): getDrawable (int) in Context cannot be
applied to (java.lang.String)
mSlikaNstavi is ImageView, and I would like to change image from java. I cant write in R.drawable.br2 in getDrwable() because every time mQuestionNumber is different.

I guess you have drawables like br1, br2, br3,... and you think that by concatenating R.drawable.br and mQuestionNumber you get the id of the drawable but this is not the case.
do this:
int id = getResources().getIdentifier("br" + mQuestionNumber, "drawable", getPackageName());
mSlikaNastavi.setImageDrawable(getDrawable(id));

A drawable Id needs to be int rather than String. You can get the relative int Id using getIdentifier()
Instead of
mSlikaNastavi.setImageDrawable(getDrawable(id))
Use
String id = "br" + mQuestionNumber;
mSlikaNastavi.setImageDrawable(getDrawable(getResources().getIdentifier(id, "drawable", getPackageName())));`

Here you need to extract the Drawable Id by passing your own id value, instead of the ids which are present in R.java
So for that getIdentifier method is used where you need to provide the drawable name, type of the resource which is "drawable" in your case, and the packageName where Android will search the drawable from.
int drawableId = getResources().getIdentifier("br" + mQuestionNumber,"drawable",getPackageName());
After the id is found, use it to show it in imageView using setImageDrawable() and as it required Drawable get the Drawabel from its iD using getDrawable() passing in the ID.
mSlikaNastavi.setImageDrawable(getResources().getDrawable(drawableId));
So the code is:
int drawableId = getResources().getIdentifier("br" + mQuestionNumber,"drawable",getPackageName());
mSlikaNastavi.setImageDrawable(getResources().getDrawable(drawableId));

Need to show random picture for behaviour

Please, forgive my ignorance, as I am new to Java programming. However, I need to show a picture (at random) for each of the three behaviours listed, below. Each picture has a designated image - What would be the best method to do so?
String whatsUp()
{
double r;
int myNumber;
String behaviour="";
r = Math.random();
myNumber = (int) (r * 3.0)+1;
switch(myNumber)
{
case 1:
behaviour = "reading";
break;
case 2:
behaviour = "surfing the web";
break;
case 3:
behaviour = "interacting with other students";
break;
}
return behaviour;
}
}

First of all, your process to get a random number doesn't make a lot of sense. What you'll want to to is create a new random object "r":
Random r = new Random();
Then you can use this object to create a random number from zero to a certain index. In your case this would be three.
int randomNumber = r.nextInt(index); //replace index with three
However, this would give the numbers 0, 1, and 2 so you will want to add one to the number.
int randomNumber = r.nextInt(index) + 1;
This will now give you a random number from one to three.
To get three images into the system you could use ImageIcon or similar method, which I will let you figure out for yourself.
I would then put the ImageIcons inside an ArrayList so that they can be easily accessed like so:
ArrayList<ImageIcon> images = new ArrayList<ImageIcon>();
images.add(imageOne);
images.add(imageTwo);
images.add(imageThree);
Thus, when inside case 1, 2, or 3 you could have a reference to the ArrayList you created with the first random number you you created like this
selectedImage = images.get(r); // the random number acts as the index
This will not display any image; you will have to work out how to do that yourself, but hopefully this gives you a good idea of where to go from here.

ImageView setBackround inside the activity dynamically

Inside my drawabale folder I have these images: levelone, leveltwo, level three.
i need to set the ImageView according to the inputted string as follows:
levelindicatorImageView = (ImageView) findViewById(R.id.levelindicatorImageView);
String tempo="R.drawable.level"+LevelReached;
Drawable replacer = getResources().getDrawable(tempo);
int sdk = android.os.Build.VERSION.SDK_INT;
if(sdk < android.os.Build.VERSION_CODES.JELLY_BEAN) {
levelindicatorImageView.setBackgroundDrawable(replacer);
} else {
levelindicatorImageView.setBackground(replacer);
}
levelindicatorImageView.invalidate();
now inside LevelReached variable i have the needed level (one, two, three)
I need to set the Image R.drawable.leveltwo etc...
How is that possible please?
as getDrawable doesn't work with tempo (needs int)
thanks for the help!

You have 2 options:
Option 1:
Simply use a switch-case to get the correct drawable, then set it as a background image as you normally would
// Get the level drawable resource id
int imageRes = R.drawable.default_image;
switch (levelReached) {
case LEVEL_ONE: // 1
imageRes = R.drawable.level_one;
break;
case LEVEL_TWO: // 2
imageRes = R.drawable.level_two;
break;
...
}
// Set the drawable as a background
levelIndicatorImageView.setBackgroundResource(imageRes);
Where LEVEL_ONE == 1; LEVEL_TWO == 2; as const or enum.
Option 2:
You can find a drawable resource by name (as you wanted), but it is less recommended since it is more error prune. But if you must, use following example:
// Get the level drawable resource id
int imageRes = getResources().getIdentifier("level"+levelReached, "drawable", getPackageName());
// Set the drawable as a background
levelIndicatorImageView.setBackgroundResource(imageRes);
Note:
You don't need to explicitly invalidate the view if you set the background since setting a new background will trigger invalidation by itself. So, this line:
levelindicatorImageView.invalidate();
is not needed.

You cant append input string to image name, but what you can do is,
select the image based on input string and then If you have 3 different images, try with ;
if(input.equalsIgnoreCase("input one"))
{
int id = R.drawable.<img one>;
}
else
{
//so on
}
levelindicatorImageView.setBackground(getResources().getDrawable( id) );

You need to do something like this:
public int getResourecId(String level) {
if(level.equalsIgnoreCase("one"))
return R.drawable.levelone;
if(level.equalsIgnoreCase("two"))
return R.drawable.leveltwo;
if(level.equalsIgnoreCase("three"))
return R.drawable.levelthree;
return 0;
}
and then:
Drawable replacer = getResources().getDrawable(getResourceId(LevelReached));

You need to associate the levels to a resource, in this case, an int. An idiomatic way of doing this would be to store the levels as an enum, say
enum Level { ONE, TWO, THREE }
Using an enum in this way allows you some flexibility with your level conventions. For example, if you later wanted to add the level TWO_THIRDS, there is nothing stoping you. Then, associate each level with a resource in an EnumMap, for example:
Map<Level, Integer> levelResources = new EnumMap<Level, Integer>(Level.class);
levelResources.put(ONE, R.drawable.levelOne);
levelResources.put(TWO, R.drawable.levelTwo);
levelResources.put(THREE, R.drawable.levelThree);
Now, instead of passing around a string which describes your current level, you can pass around an enum, which you can use to determine the correct resource without concatenating strings. So, suppose that levelReached is of type Level, you could write:
Integer tempo = levelResources.get(levelReached);
Drawable replacer = getResources().getDrawable(tempo);

numbered images on setImageResource

I'm working on an Android App, and I had the following code:
int digit = 0;
imageButton = (ImageView)findViewById(R.id.btn1);
numberedImage = (ImageView)findViewById(R.id.Digit1);
imageButton.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
digit++;
numberedImage.setImageResource(R.drawable.number + ((digit) + 1));
}
});
and some images on a drawable folder called number1, number2, and so on...
This code was working perfectly, and then, suddenly, it's not working anymore.
I want the ImageView to change the images each click, and what made me completely confused, is the fact that this code was working completely fine (even though it might be wrong some way, I'm not a programmer), and all of the sudden, it's not anymore...
After that I also tried using arrays and loops, but I encountered the same error:
"number cannot be resolved or is not a field"
which wasn't a problem before.

You have some misunderstanding. But may be fortunately(or unfortunately) your code gave you some successful result for which your misunderstanding was more firmed.
ImageView.setImageResource takes a resource id as parameter. not a image name. so when you are adding a digit to the resource id it is setting the image of next id. as your images' names are sequential so the ids were also sequential that's why you got successful result. But it is not guranteed that you will always be getting that done.
I guess previously it was working because there was an image named number in your resource. But now it is removed.
Proposed solution
Resources res = getResources();
String mDrawableName = "number" + digit + 1; // be sure those exist
int resID = res.getIdentifier(mDrawableName , "drawable", getPackageName()); numberedImage.setImageResource(resId);

please kindly use
for(int i=0;i<imageCount;i++){
int imageResId = getResources().getIdentifier("image" + i, "id", YourActivity.this.getPackageName());
numberedImage.setImageResource(imageResId);
}
in order to access image by resource name.