- Part 2

Android: Set Min & Max Value An EditText Accepts

June 27, 2011 by blogmeister·20 Comments

Forcing an EditText to accept a number value from a certain range entails the use of filters using the InputFilter class. I created a custom made class that lets you set an EditText to accept only values between a minimum and maximum value.

Here is the class.

public class InputFilterMinMax implements InputFilter {
	private int min, max;
	public InputFilterMinMax(int min, int max) {
		this.min = min;
		this.max = max;
	}
	public InputFilterMinMax(String min, String max) {
		this.min = Integer.parseInt(min);
		this.max = Integer.parseInt(max);
	}
	@Override
	public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {	
		try {
			int input = Integer.parseInt(dest.toString() + source.toString());
			if (isInRange(min, max, input))
				return null;
		} catch (NumberFormatException nfe) { }		
		return "";
	}
	private boolean isInRange(int a, int b, int c) {
		return b > a ? c >= a && c <= b : c >= b && c <= a;
	}
}

public class InputFilterMinMax implements InputFilter {

private int min, max;

public InputFilterMinMax(int min, int max) {

this.min = min;

this.max = max;

}

public InputFilterMinMax(String min, String max) {

this.min = Integer.parseInt(min);

this.max = Integer.parseInt(max);

}

@Override

public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {

try {

int input = Integer.parseInt(dest.toString() + source.toString());

if (isInRange(min, max, input))

return null;

} catch (NumberFormatException nfe) { }

return "";

}

private boolean isInRange(int a, int b, int c) {

return b > a ? c >= a && c <= b : c >= b && c <= a;

}

To use the class, do it like this which sets an EditText to accept any number between 1 and 100.

EditText et = (EditText) findViewById(R.id.your_edittext);
et.setFilters(new InputFilter[]{ new InputFilterMinMax("1", "100");

1 2	EditText et = (EditText) findViewById(R.id.your_edittext); et.setFilters(new InputFilter[]{ new InputFilterMinMax("1", "100");

There! Now you should be able to have your EditText accept only your desired values. Just be sure you set your EditText widget to accept only numbers.

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June 25, 2011 by blogmeister·33 Comments

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Change Spinner Style In Android

June 25, 2011 by blogmeister·7 Comments

Changing themes and styles of Android widgets require you to modify its drawable images. For the Spinner widget, I found it necessary to have the height changed because the default is just too fat.

You need to create your own 9 patch images or you can get the existing one in Android‘s and modify it. A quicker way though is to make use of this great article by Kostya Vasilyev on compact Spinner widgets.

There are already 9 patch images for you to use. If you want it to have a different color then you will have to modify it yourself. But at least there is already a thin image ready for you to use.

This is a screenshot taken from his site showing the slim spinners side-by-side with the regular ones in an HTC Hero smartphone.

And these are his 9 patch images.

To use the images in an XML file, place them in a selector XML file like this and use it in the Spinner tag.

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
     <item android:state_pressed="true"
           android:drawable="@drawable/slim_spinner_pressed" />
     <item android:drawable="@drawable/slim_spinner_normal" />
</selector>
<Spinner ..... android:background="@drawable/selector_slim_spinner" ..... />

<?xml version="1.0" encoding="utf-8"?>

<item android:state_pressed="true"

android:drawable="@drawable/slim_spinner_pressed" />

</selector>

There you have it. Now you have slimmer Spinner widgets for your app! Just make sure when you save these images from my post you replace the -9 in the filename to .9 because all 9 patch images should end with .9.png.

Tech Tips & Tricks

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Month: June 2011

Android: Set Min & Max Value An EditText Accepts

Create Your First Website & Make Money Online

Change Spinner Style In Android