How can I get zoom functionality for images?

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UPDATE

I’ve just given TouchImageView a new update. It now includes Double Tap Zoom and Fling in addition to Panning and Pinch Zoom. The code below is very dated. You can check out the github project to get the latest code.

USAGE

Place TouchImageView.java in your project. It can then be used the same as
ImageView. Example:

TouchImageView img = (TouchImageView) findViewById(R.id.img);

If you are using TouchImageView in xml, then you must provide the full package
name, because it is a custom view. Example:

<com.example.touch.TouchImageView
    android:id="@+id/img”
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

Note: I’ve removed my prior answer, which included some very old code and now link straight to the most updated code on github.

ViewPager

If you are interested in putting TouchImageView in a ViewPager, refer to this answer.

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