Android 旋转图片

    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,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(),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);  
                }  
            });  
              
        }  
          
          
    }