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+1 A:

There's a reasonably well-supported Intent for this (worked on my testing on at least a half dozen different Android 2.1+ phones, including SenseUI and Motoblur devices, and I believe it's been around since Android 1.0 or earlier on the G1). This might get you started:

    final Intent intent = new Intent("com.android.camera.action.CROP");
    intent.setData(uriOfImageToCrop);
    intent.putExtra("outputX", 400);
    intent.putExtra("outputY", 400);
    intent.putExtra("aspectX", 1);
    intent.putExtra("aspectY", 1);
    intent.putExtra("scale", true);
    intent.putExtra("noFaceDetection", true);
    intent.putExtra("output", Uri.fromFile(someOutputFile));
    startActivityForResult(intent, SOME_RANDOM_REQUEST_CODE);

Then just handle what you need to do in the onActivityResult() method of your Activity; your output file should have the cropped image in it at that point.

To be safe, though, you may want to have a fallback behavior (autocrop? Don't crop?) if someone has a device that doesn't support this Intent.

Yoni Samlan 2010-10-22 20:43:50

How can I tell if this Intent is supported?

synic 2010-10-22 21:05:22

Also, are you sure that's the intent name? I get the following error on the Droid and the emulator: No Activity found to handle Intent { act=com.android.camera.action.CROP dat=file:///mnt/sdcard/data/okcupid/mediacache/takephoto (has extras) }

synic 2010-10-22 21:09:08

See this Romain Guy blog post on checking if there's an intent available: http://android-developers.blogspot.com/2009/01/can-i-use-this-intent.html As far as why you're getting the error, it may not be recognizing the format of the URL you're passing it... I always operate directly on a URI returned in the data portion of an Intent from an ACTION_PICK or ACTION_IMAGE_CAPTURE, which I believe comes back with a "media://" URI. You also may want to check some other documentation, like http://www.androidworks.com/crop_large_photos_with_android

Yoni Samlan 2010-10-24 17:25:06

And of course, the Android AOSP source code for the Camera app, including its manifest, which should tell you exactly what intent-filters are set up for this on default Android devices.

Yoni Samlan 2010-10-24 17:25:44

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Image cropping activity/widget

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