Android编程画图之抗锯齿解决方法

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PaintFlagsDrawFilter;
import android.view.View;
public class MyView extends View {
  private PaintFlagsDrawFilter pfd;
  private Paint mPaint = new Paint();
  private Matrix matrix = new Matrix();;
  private Bitmap bmp;
  public MyView(Context context) {
    super(context);
    initialize();
  }
  private void initialize() {
    pfd = new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG|Paint.FILTER_BITMAP_FLAG);
    mPaint.setAntiAlias(true);
    matrix.setRotate(30);
    matrix.postScale(0.5f, 0.5f);
    bmp = BitmapFactory.decodeResource(getResources(), R.drawable.show);
  }
  @Override
  public void dispatchDraw(Canvas canvas) {
    canvas.translate(100, 0);
    canvas.drawBitmap(bmp, matrix, null);
    canvas.translate(0, 250);
    canvas.drawBitmap(bmp, matrix, mPaint);
    canvas.setDrawFilter(pfd);
    canvas.translate(0, 250);
    canvas.drawBitmap(bmp, matrix, null);
  }
}