Android 图片处理缩放功能

功能：

• 正常加载图片
• 双击放大
• 手势随意缩放
• 随意拖动查看图片每一个角落
• 结合其他设置可实现翻转

• 1:本地图片加载

  <ImageView
      android:layout_width="match_parent"
      android:layout_height="300dp"
      android:id="@+id/id_loc"
      android:scaleType="fitXY"
      />
  <uk.co.senab.photoview.PhotoView
      android:layout_width="match_parent"
      android:layout_height="400dp"
      android:src="@mipmap/ic_launcher"
      android:id="@+id/id_myimg"/>

  第一种方法：

   //本地加载方法一
      // 设置图片
      Drawable bitmap = getResources().getDrawable(R.mipmap.ic_launcher);
      loc.setImageDrawable(bitmap);
      // 连接在photoview中
      PhotoViewAttacher mAttacher = new PhotoViewAttacher(loc);
      mAttacher.update();//更新 

  第二种

  //本地方法加载二
      PhotoViewAttacher mAttacher;
      mAttacher = new PhotoViewAttacher(loc);
      iv.setImageBitmap(bitmap);
      Glide.with(this).load(R.mipmap.ic_launcher).asBitmap().into(loc);
      mAttacher.update();

   2：网络图片加载

  对于网络也是可以用ImageView和PhotoView两种

  把ImageView或者PhotoView的对象名直接添加到display中就OK 了。    

  //加载网络图片
      ImageLoader loader= ImageLoader.getInstance();
      loader.init(ImageLoaderConfiguration.createDefault(ImageTest.this));//loader初始化
      loader.displayImage("https://ss0.bdstatic.com/94oJfD_bAAcT8t7mm9GUKT-xh_/timg?image&quality=100&size=b4000_4000&sec=1529211252&di=1414331e22239ecb5730cbbd0f3793eb&src=http://pic154.nipic.com/file/20180114/26629113_090329120799_2.jpg",loc);//展示图片

  看一下源码，其实他也是继承了ImageView

  /**
     * Adds display image task to execution pool. Image will be set to ImageView when it's turn. <br/>
     * Default {@linkplain DisplayImageOptions display image options} from {@linkplain ImageLoaderConfiguration
     * configuration} will be used.<br />
     * <b>NOTE:</b> {@link #init(ImageLoaderConfiguration)} method must be called before this method call
     *
     * @param uri    Image URI (i.e. "http://site.com/image.png", "file:///mnt/sdcard/image.png")
     * @param imageView {@link ImageView} which should display image
     * @throws IllegalStateException  if {@link #init(ImageLoaderConfiguration)} method wasn't called before
     * @throws IllegalArgumentException if passed <b>imageView</b> is null
     */
    public void displayImage(String uri, ImageView imageView) {
      displayImage(uri, new ImageViewAware(imageView), null, null, null);
    }