Android
drawable

Tinta un drawable

Un drawable può essere colorato di un certo colore. Questo è utile per supportare diversi temi all'interno dell'applicazione e ridurre il numero di file di risorse estraibili.

Utilizzo delle API framework su SDK 21+:

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

Utilizzando la libreria android.support.v4 su 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

Si prega di int color che il int color non si riferisce a una risorsa colore, tuttavia non si è limitati a quei colori definiti nella classe 'Colore'. Quando hai un colore definito nel tuo XML che vuoi usare devi prima averne il valore.

È possibile sostituire gli usi di Color.WHITE utilizzando i metodi seguenti

Quando si rivolgono alle API precedenti:

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

O su obiettivi più recenti:

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

Crea vista con angoli arrotondati

Crea un file drawable denominato con custom_rectangle.xml nella cartella drawable :

<?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>

Ora applica lo sfondo del rettangolo sulla vista :

mView.setBackGround(R.drawlable.custom_rectangle);

Schermata di riferimento:

Vista circolare

Per una vista circolare (in questo caso TextView ) crea un file draw_view.xml nella cartella drawble :

<?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>

Assegna il drawable alla vista:

    <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" />

Ora dovrebbe assomigliare al cerchio arancione:

Disegnato su misura

Estendi la tua classe con Drawable e sovrascrivi questi metodi

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;
    }
}

Dichiarare una ImageView nel proprio layout

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

Imposta il tuo drawable personalizzato su ImageView

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

Immagine dello schermo