Android(安卓)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, Animation.RELATIVE_TO_SELF, 0.5f);@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.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() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubrotateBitmap1();}});        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() {@Overridepublic void onAnimationStart(Animation animation) {// TODO Auto-generated method stub}@Overridepublic void onAnimationRepeat(Animation animation) {// TODO Auto-generated method stub}@Overridepublic void onAnimationEnd(Animation animation) {// TODO Auto-generated method stubrotateAnimation.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);}});}}
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