import android.app.Activity;        import android.graphics.Bitmap;        import android.graphics.Matrix;        import android.graphics.drawable.BitmapDrawable;        import android.os.Bundle;        import android.view.View;        import android.view.View.OnClickListener;        import android.view.animation.Animation;        import android.view.animation.Animation.AnimationListener;        import android.view.animation.RotateAnimation;        import android.widget.Button;        import android.widget.ImageView;        import android.widget.LinearLayout;                public class RotateBitmapActivity extends Activity {                        Button btnRotate1, btnRotate2;            ImageView ivBitmap;                        //逆时针转45度            RotateAnimation rotateAnimation = new RotateAnimation(0, -45, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);                        @Override            protected void onCreate(Bundle savedInstanceState) {                // TODO Auto-generated method stub                super.onCreate(savedInstanceState);                setTitle("旋转图片");                setContentView(R.layout.rorate_bitmap);                btnRotate1 = (Button) findViewById(R.id.btn_rorate);                btnRotate2 = (Button) findViewById(R.id.btn_rorate_anim);                ivBitmap = (ImageView) findViewById(R.id.iv_bitmap);                                btnRotate1.setOnClickListener(new OnClickListener() {                                        @Override                    public void onClick(View v) {                        // TODO Auto-generated method stub                        rotateBitmap1();                    }                });                btnRotate2.setOnClickListener(new OnClickListener() {                                        @Override                    public void onClick(View v) {                        // TODO Auto-generated method stub                        rotateBitmap2();                    }                });            }            /**            * 使用矩阵对象 旋转            */            private void rotateBitmap1() {                LinearLayout linLayout = new LinearLayout(this);                 BitmapDrawable bitmapDrawable = (BitmapDrawable) ivBitmap.getDrawable();                //获取这个图片的宽和高                int width = bitmapDrawable.getBitmap().getWidth();                 int height = bitmapDrawable.getBitmap().getHeight();                 //定义预转换成的图片的宽度和高度                int newWidth = getWindow().getWindowManager().getDefaultDisplay().getWidth() / 2;                 int newHeight = getWindow().getWindowManager().getDefaultDisplay().getHeight() / 2;                //计算缩放率，新尺寸除原始尺寸                float scaleWidth = ((float) newWidth) / width;                 float scaleHeight = ((float) newHeight) / height;                 // 创建操作图片用的matrix对象                Matrix matrix = new Matrix();                 // 缩放图片动作                matrix.postScale(scaleWidth, scaleHeight);                 //旋转图片 动作                matrix.postRotate(90);                 // 创建新的图片                Bitmap resizedBitmap = Bitmap.createBitmap(bitmapDrawable.getBitmap(), 0, 0, width, height, matrix, true);                                ivBitmap.setImageBitmap(resizedBitmap);            }                        /**            * 通过动画方式旋转，实际位置没有改变，当再次运行该函数，图像还是从原来的位置开始转动            */            private void rotateBitmap2() {                                 rotateAnimation.setDuration(1000);                ivBitmap.startAnimation(rotateAnimation);                                rotateAnimation.setAnimationListener(new AnimationListener() {                                        @Override                    public void onAnimationStart(Animation animation) {                        // TODO Auto-generated method stub                                            }                                        @Override                    public void onAnimationRepeat(Animation animation) {                        // TODO Auto-generated method stub                                            }                                        @Override                    public void onAnimationEnd(Animation animation) {                        // TODO Auto-generated method stub                        rotateAnimation.setFillAfter(true);//动画后的效果固定下来，实际图片位置没有改变                        //逆时针转45度  坐标点算不好，        //              ivBitmap.layout(l, t, r, b);                    }                });                            }                                }