Android编程之阴影(Shadow)制作方法

public void setShadowLayer (float radius, float dx, float dy, int color)

package xiaosi.textShadow;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Bundle;
import android.view.View;
public class TextShadowActivity extends Activity
{
  @Override
  public void onCreate(Bundle savedInstanceState)
  {
    super.onCreate(savedInstanceState);
    setContentView(new drawCanvas(this));
  }
  class drawCanvas extends View
  {
    private Bitmap bitmap = null;
    public drawCanvas(Context context)
    {
      super(context);
      bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.i_skinprocess);
    }
    @Override
    protected void onDraw(Canvas canvas)
    {
      super.onDraw(canvas);
      // 建立Paint 物件
      Paint paint1 = new Paint();
      // 设定颜色
      paint1.setColor(0xFFFFFF00);
      // 设定阴影(柔边, X 轴位移, Y 轴位移, 阴影颜色)
      paint1.setShadowLayer(5, 3, 3, 0xFFFF00FF);
      // 实心矩形& 其阴影
      canvas.drawText("我很爱你", 20,40,paint1);
      Paint paint2 = new Paint();
      paint2.setColor(Color.GREEN);
      paint2.setShadowLayer(10, 5, 2, Color.YELLOW);
      canvas.drawText("你真傻", 20,60,paint2);
      Paint paint3 = new Paint();
      paint3.setColor(Color.RED);
      paint3.setShadowLayer(30, 5, 2, Color.GREEN);
      canvas.drawCircle(50, 130,30, paint3);
      Paint paint4 = new Paint();
      paint4.setShadowLayer(5, 8, 7, Color.DKGRAY);
      canvas.drawBitmap(bitmap, 50, 200, paint4);
    }
  }
}