Android ImageView 擴展：PhotoView

PhotoView 是一款擴展自Android ImageView ，支持通過單點/多點觸摸來進行圖片縮放的智能控件。

ImageView mImageView;
PhotoViewAttacher mAttacher;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // Any implementation of ImageView can be used!
    mImageView = (ImageView) findViewById(R.id.iv_photo);

    // Set the Drawable displayed
    Drawable bitmap = getResources().getDrawable(R.drawable.wallpaper);
    mImageView.setImageDrawable(bitmap);

    // Attach a PhotoViewAttacher, which takes care of all of the zooming functionality.
    mAttacher = new PhotoViewAttacher(mImageView);
}


// If you later call mImageView.setImageDrawable/setImageBitmap/setImageResource/etc then you just need to call
attacher.update();

特性：

1. 支持單點/多點觸摸，即時縮放圖片；
2. 支持平滑滾動；
3. 在滑動父控件下能夠運行良好；（例如：ViewPager）
   
   

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