bitmap画向左---右的按钮

private Bitmap getLeftIcon() {

Shader gradient = new LinearGradient(0, 0, height >> 

1, 0, new int[] {

Color.rgb(180, 196, 219), Color.rgb

(231, 240, 245) }, null,

TileMode.REPEAT);

Paint paint = new Paint();

paint.setAntiAlias(true);

paint.setShader(gradient);

Bitmap bitmap = Bitmap.createBitmap(height, height, 

Config.ARGB_8888);

Canvas canvas = new Canvas(bitmap);

canvas.drawCircle(height >> 1, height >> 1, height 

>> 1, paint);

paint.setShader(null);

paint.setColor(Color.WHITE);

paint.setAlpha(255);

canvas.drawCircle(height >> 2, height >> 1, 0.15f * 

height, paint);

paint.setColor(Color.RED);

Path path = new Path();

path.moveTo(height >> 3, height >> 1);

path.lineTo(0.325f * height, 0.4f * height);

path.lineTo(0.325f * height, 0.6f * height);

path.close();

canvas.drawPath(path, paint);

return Bitmap.createBitmap(bitmap, 0, 0, height >> 

1, height);

}

/**

 * 获取右边指示钮的bitmap

 * 

 * @return

 */

private Bitmap getRightIcon() {

//可以旋转的

Matrix m = new Matrix();

//位置旋转180度

m.postRotate(180);

Bitmap bitmap = getLeftIcon();

//给左边的bitmap添加旋转对象

return Bitmap.createBitmap(bitmap, 0, 0, height >> 

1, height, m, false);

}