Android之阴影制作(Shadow)
阴影制作:包括各种形状(矩形,圆形等等),以及文字等等都能设置阴影。
阴影制作是什么原理呢?
其实很简单,你需要设置阴影的东西被看作一个主层。然后在主层下面画一个阴影层。
阴影制作涉及到一个重要函数:
public void setShadowLayer (float radius, float dx, float dy, int color)
radius:阴影半径
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:[java] 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);
}
}
}
摘自 agods--足迹
补充:移动开发 , Android ,