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Android开发实现图片平移、缩放、倒影及旋转功能的方法

2019年07月24日  | 移动技术网IT编程  | 我要评论

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本文实例讲述了android开发实现图片平移、缩放、倒影及旋转功能的方法。分享给大家供大家参考，具体如下：

解析：

1）根据原来的图片创建新的图片

bitmap modbm = bitmap.createbitmap(bm.getwidth()+20, bm.getheight()+20, bm.getconfig());

2）设置到画布

canvas canvas = new canvas(modbm);

3）使用矩阵进行平移…

matrix matrix = new matrix();
matrix.setrotate(90, bm.getwidth()/2, bm.getheight()/2);

4）把改变后图片设置到

canvas.drawbitmap(bm, matrix, paint);
imageview2.setimagebitmap(modbm);

示例代码：

1、平移：

public class translateimageactivity extends activity {
  private imageview imageview1;
  private imageview imageview2;
  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_image_rotate);
    initviews();
  }
  private void initviews() {
    imageview1 = (imageview) findviewbyid(r.id.imageview1);
    imageview2 = (imageview) findviewbyid(r.id.imageview2);
    bitmap bm = bitmapfactory.decoderesource(getresources(), r.drawable.mm0);
    imageview1.setimagebitmap(bm);
    bitmap modbm = bitmap.createbitmap(bm.getwidth()+20, bm.getheight()+20, bm.getconfig());
    canvas canvas = new canvas(modbm);
    paint paint = new paint();
    paint.setcolor(color.black);
    paint.setantialias(true);
    matrix matrix = new matrix();
    //matrix.setrotate(90, bm.getwidth()/2, bm.getheight()/2);
    matrix.settranslate(20, 20);
    matrix.posttranslate(20, 20);
    canvas.drawbitmap(bm, matrix, paint);
    imageview2.setimagebitmap(modbm);
  }
}

2、缩放

public class scaleimageactivity extends baseactivity {
  private static final int double = 2;
  private imageview iv1, iv2;
  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_scale_iamge);
    iv1 = (imageview) findviewbyid(r.id.imageview1);
    iv2 = (imageview) findviewbyid(r.id.imageview2);
    bitmap b1 = bitmapfactory.decoderesource(getresources(), r.drawable.p1);
    iv1.setimagebitmap(b1);
    bitmap b2 = bitmap.createbitmap(b1.getwidth()*double, b1.getheight(), config.argb_8888);
    canvas canvas = new canvas(b2);
    matrix matrix = new matrix();
    matrix.setvalues(new float[]{
        double * 1.0f, 0,    0,//x
        0,       1.0f,  0,//y
        0,       0,    1.0f//z
    });
    canvas.drawbitmap(b1, matrix, new paint());
    iv2.setimagebitmap(b2);
  }
}

3、倒影

public class shadeimageactivity extends activity {
  private imageview imageview1;
  private imageview imageview2;
  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_image_rotate);
    initviews();
  }
  private void initviews() {
    imageview1 = (imageview) findviewbyid(r.id.imageview1);
    imageview2 = (imageview) findviewbyid(r.id.imageview2);
    bitmap bm = bitmapfactory.decoderesource(getresources(), r.drawable.mm3);
    imageview1.setimagebitmap(bm);
    bitmap modbm = bitmap.createbitmap(bm.getwidth(), bm.getheight(), bm.getconfig());
    canvas canvas = new canvas(modbm);
    paint paint = new paint();
    paint.setcolor(color.black);
    paint.setantialias(true);
    matrix matrix = new matrix();
    //matrix.setrotate(90, bm.getwidth()/2, bm.getheight()/2);
    //matrix.settranslate(20, 20);
    //镜子效果
    matrix.setscale(1, -1);
    matrix.posttranslate(0, bm.getheight());
    canvas.drawbitmap(bm, matrix, paint);
    imageview2.setimagebitmap(modbm);
  }
}

4、旋转

public class rotateimageactivity extends activity {
  private imageview imageview1;
  private imageview imageview2;
  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_image_rotate);
    initviews();
  }
  private void initviews() {
    imageview1 = (imageview) findviewbyid(r.id.imageview1);
    imageview2 = (imageview) findviewbyid(r.id.imageview2);
    bitmap bm = bitmapfactory.decoderesource(getresources(), r.drawable.mm0);
    imageview1.setimagebitmap(bm);
    bitmap modbm = bitmap.createbitmap(bm.getwidth(), bm.getheight(), bm.getconfig());
    canvas canvas = new canvas(modbm);
    paint paint = new paint();
    paint.setcolor(color.black);
    paint.setantialias(true);
    matrix matrix = new matrix();
    matrix.setrotate(90, bm.getwidth()/2, bm.getheight()/2);
    canvas.drawbitmap(bm, matrix, paint);
    imageview2.setimagebitmap(modbm);
  }
}

更多关于android相关内容感兴趣的读者可查看本站专题：《android图形与图像处理技巧总结》、《android开发入门与进阶教程》、《android调试技巧与常见问题解决方法汇总》、《android基本组件用法总结》、《android视图view技巧总结》、《android布局layout技巧总结》及《android控件用法总结》

希望本文所述对大家android程序设计有所帮助。

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