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Android - Drawables
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  Tint a drawable

A drawable can be tinted a certain color. This is useful for supporting different themes within your application, and reducing the number of drawable resource files.

Using framework APIs on SDK 21+:

Drawable d = context.getDrawable(R.drawable.ic_launcher);
d.setTint(Color.WHITE);

Using android.support.v4 library on SDK 4+:

//Load the untinted resource
final Drawable drawableRes = ContextCompat.getDrawable(context, R.drawable.ic_launcher);
//Wrap it with the compatibility library so it can be altered
Drawable tintedDrawable = DrawableCompat.wrap(drawableRes);
//Apply a coloured tint
DrawableCompat.setTint(tintedDrawable, Color.WHITE);
//At this point you may use the tintedDrawable just as you usually would 
//(and drawableRes can be discarded)

//NOTE: If your original drawableRes was in use somewhere (i.e. it was the result of 
//a call to a `getBackground()` method then at this point you still need to replace 
//the background. setTint does *not* alter the instance that drawableRes points to, 
//but instead creates a new drawable instance

Please not that int color is not referring to a color Resource, however you are not limited to those colours defined in the 'Color' class. When you have a colour defined in your XML which you want to use you must just first get it's value.

You can replace usages of Color.WHITE using the methods below

When targetting older API's:

getResources().getColor(R.color.your_color);

Or on newer targets:

ContextCompat.getColor(context, R.color.your_color);
  Custom Drawable

Extend your class with Drawable and override these methods

public class IconDrawable extends Drawable {
    /**
     * Paint for drawing the shape
     */
    private Paint paint;
    /**
     * Icon drawable to be drawn to the center of the shape
     */
    private Drawable icon;
    /**
     * Desired width and height of icon
     */
    private int desiredIconHeight, desiredIconWidth;

    /**
     * Public constructor for the Icon drawable
     *
     * @param icon            pass the drawable of the icon to be drawn at the center
     * @param backgroundColor background color of the shape
     */
    public IconDrawable(Drawable icon, int backgroundColor) {
        this.icon = icon;
        paint = new Paint(Paint.ANTI_ALIAS_FLAG);
        paint.setColor(backgroundColor);
        desiredIconWidth = 50;
        desiredIconHeight = 50;
    }

    @Override
    public void draw(Canvas canvas) {
        //if we are setting this drawable to a 80dpX80dp imageview 
        //getBounds will return that measurements,we can draw according to that width.
        Rect bounds = getBounds();
        //drawing the circle with center as origin and center distance as radius
        canvas.drawCircle(bounds.centerX(), bounds.centerY(), bounds.centerX(), paint);
        //set the icon drawable's bounds to the center of the shape
        icon.setBounds(bounds.centerX() - (desiredIconWidth / 2), bounds.centerY() - (desiredIconHeight / 2), (bounds.centerX() - (desiredIconWidth / 2)) + desiredIconWidth, (bounds.centerY() - (desiredIconHeight / 2)) + desiredIconHeight);
        //draw the icon to the bounds
        icon.draw(canvas);

    }

    @Override
    public void setAlpha(int alpha) {
        //sets alpha to your whole shape
        paint.setAlpha(alpha);
    }

    @Override
    public void setColorFilter(ColorFilter colorFilter) {
       //sets color filter to your whole shape
        paint.setColorFilter(colorFilter);
    }

    @Override
    public int getOpacity() {
        //give the desired opacity of the shape
        return PixelFormat.TRANSLUCENT;
    }
}

Declare a ImageView in your layout

<ImageView
   android:layout_width="80dp"
   android:id="@+id/imageView"
   android:layout_height="80dp" />

Set your custom drawable to the ImageView


IconDrawable iconDrawable=new IconDrawable(ContextCompat.getDrawable(this,android.R.drawable.ic_media_play),ContextCompat.getColor(this,R.color.pink_300));
 imageView.setImageDrawable(iconDrawable);

Screenshot

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  Circular View

For a circular View (in this case TextView) create a drawble round_view.xml in drawble folder:

<?xml version="1.0" encoding="utf-8"?>
<shape
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval">
    <solid android:color="#FAA23C" />
    <stroke android:color="#FFF" android:width="2dp" />
</shape>

Assign the drawable to the View:


   <TextView
        android:id="@+id/game_score"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:background="@drawable/round_score"
        android:padding="6dp"
        android:text="100"
        android:textColor="#fff"
        android:textSize="20sp"
        android:textStyle="bold"
        android:gravity="center" />

Now it should look like the orange circle:

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  Make View with rounded corners

Create drawable file named with custom_rectangle.xml in drawable folder:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >

    <solid android:color="@android:color/white" />

    <corners android:radius="10dip" />

    <stroke
        android:width="1dp"
        android:color="@android:color/white" />

</shape>

Now apply rectangle background on View:

mView.setBackGround(R.drawlable.custom_rectangle);

Reference screenshot:

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Read Article
https://develop.horje.com/learn/1434/reference

 

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