dx：X轴方向的偏移量
dy：Y轴方向的偏移量
color：阴影颜色
注意：如果半径被设置为0，意思就是去掉阴影。
具体实现：
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); } } }
