如何在imageview中添加缩放效果

Question

我想在活动中展示一张图片。我成功地用imageview.But制作了它，它没有缩放效果。我无法缩放这张照片。现在我该如何添加这个缩放效果呢？我的.xml代码是：

 <ImageView
    android:id="@+id/imageView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:scaleType="fitXY"
    android:src="@drawable/cat" />

Answer 1

使用lib https://github.com/chrisbanes/PhotoView

在代码中

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();