Utils

DrawUtils.java

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;

import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.LayerDrawable;
import android.util.DisplayMetrics;
import android.util.TypedValue;

public class DrawUtils
{
    private static final float BASE_DIP_MARKER_WIDTH = 42.f;
    private static final float BASE_DIP_MARKER_HEIGHT = 42.f;

    private DrawUtils(){}

    public static Drawable criarProfileMarker(Drawable marker, Drawable foto)
    {
        return new LayerDrawable(new Drawable[]{marker, foto});
    }

    public static BitmapDrawable criarMarkerFotoDrawable(Resources resources, Bitmap foto)
    {
        DisplayMetrics metrics = resources.getDisplayMetrics();
        int dipWidth = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
                BASE_DIP_MARKER_WIDTH, metrics);
        int dipHeight = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
                BASE_DIP_MARKER_HEIGHT, metrics);
        Bitmap redimencionado = Bitmap.createScaledBitmap(foto, dipWidth, dipHeight, true);

        return new BitmapDrawable(resources, redimencionado);
    }
    public static BitmapDrawable criarMarkerFotoDrawable(Resources resources, Bitmap foto, final DisplayMetrics metrics)
    {
        int dipWidth = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
                BASE_DIP_MARKER_WIDTH, metrics);
        int dipHeight = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
                BASE_DIP_MARKER_HEIGHT, metrics);
        Bitmap redimencionado = Bitmap.createScaledBitmap(foto, dipWidth, dipHeight, true);

        return new BitmapDrawable(resources, redimencionado);
    }

    public static byte[] criarPNGByteArray(Bitmap bitmap)
    {
        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);

        return stream.toByteArray();
    }

    public static Bitmap decodificarBitmap(byte[] data)
    {
        ByteArrayInputStream input = new ByteArrayInputStream(data);
        return BitmapFactory.decodeStream(input);
    }


    public static void drawCirculoPrecisao(Canvas canvas, float raio, int x, int y)
    {
        Paint paint = new Paint();
        paint.setAntiAlias(true);

        //preenchimento
        paint.setColor(Color.GRAY);
        paint.setAlpha(90);
        paint.setStyle(Paint.Style.FILL);
        canvas.drawCircle(x, y, raio, paint);

        //borda
        paint.setColor(Color.GRAY);
        paint.setAlpha(255);
        paint.setStyle(Paint.Style.STROKE);
        paint.setStrokeWidth(1);
        canvas.drawCircle(x, y, raio, paint);
    }

    public static Bitmap desenharStaticMapMarker(Bitmap mapa, Drawable marker)
    {
        Bitmap bitmap = mapa.copy(mapa.getConfig(), true);
        Canvas canvas = new Canvas(bitmap);

        int centerX = bitmap.getWidth() / 2;
        int centerY = bitmap.getHeight() / 2;

        Rect bounds = drawableCentralizarInferior(marker);

        Rect padding = new Rect();
        marker.getPadding(padding);

        marker.setBounds(centerX + bounds.left, centerY + bounds.top,
                centerX + bounds.right, centerY + bounds.bottom);
        marker.draw(canvas);

        return bitmap;
    }

    private static Rect drawableCentralizarInferior(Drawable drawable)
    {
        int width = drawable.getMinimumWidth();
        int height = drawable.getMinimumHeight();

        return new Rect(-(width/2), -(height - 1), (width/2), 1);
    }


}