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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

2020年02月15日 作者：佚名

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.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.getHeight()/2);
    matrix.setTranslate(20,20);
    matrix.postTranslate(20,20);
    canvas.drawBitmap(bm,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,//x
        0,1.0f,//y
        0,1.0f//z
    });
    canvas.drawBitmap(b1,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.getHeight()/2);
    //matrix.setTranslate(20,20);
    //镜子效果
    matrix.setScale(1,-1);
    matrix.postTranslate(0,bm.getHeight());
    canvas.drawBitmap(bm,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.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.getHeight()/2);
    canvas.drawBitmap(bm,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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