- 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);
- }
- });
- }
- }
来源: http://www.phpxs.com/code/1002016/