Android 旋转图片，, import a

Android 旋转图片，, import a

    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);                  }              });          }      }