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I have a application where I have some downloaded images in a folder in SD Card. I want to save it as a wallpaper.

using the below code user can set it as wallpaper.

WallpaperManager myWallpaperManager = WallpaperManager.getInstance(context);
myWallpaperManager.setBitmap(loadedImage);

However this does not bring up any UI for user to select a part of the image like crop operation when selecting a image from Gallery app to set wallpaper. I would like my code to trigger such a operation. When users click a button in my app I want to take them to gallery app with crop option to set the wallpaper.

Please let me know how to do this. Thank you.

Jagger
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Vinod
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  • which Android version do you target? – Shinigamae Dec 03 '12 at 03:28
  • Hi @Shinigamae: I want to support from 2.1. But if it is only possible from a particular version, I am okay with it. – Vinod Dec 03 '12 at 03:35
  • I did have a simple project, on 2.3. I allow user to choose an image from his library (saved from a website before) then allow him to crop that image. But I found out it didn't work well on Android 3.0 and 4.0. Need some work-around then. – Shinigamae Dec 03 '12 at 03:38

1 Answers1

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You may want to try this:

  1. To select from your library (SD Card included) - void selectPhoto(): 

    Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Choose photo to upload"), PICK_FROM_FILE);

  2. To start the crop action - void doCrop():

    Intent intent = new Intent("com.android.camera.action.CROP");
intent.setType("image/*");

// Check if there is image cropper application installed.
List<ResolveInfo> list = getPackageManager().queryIntentActivities( intent, 0 );

int size = list.size();

// If no cropper application is found, throw a message.
if (size == 0) {            
    Toast.makeText(this, "Can not find image crop app", Toast.LENGTH_SHORT).show();
    return;

// If there're cropper applications found, use the first
} else {

    // Specify image path and cropping parameters
    intent.setData(mImageCaptureUri);
    intent.putExtra("outputX", 0);
    intent.putExtra("outputY", 0);
    intent.putExtra("return-data", true);

    Intent i = new Intent(intent);
    ResolveInfo res = list.get(0);
    i.setComponent( new ComponentName(res.activityInfo.packageName, res.activityInfo.name));
    startActivityForResult(i, CROPPED_IMAGE);

  3. Handle Activity results - void onActivityResult(int requestCode, int resultCode, Intent data)

    if (resultCode != RESULT_OK) return;

switch (requestCode) {
    case PICK_FROM_FILE: 
        mImageCaptureUri = data.getData();
        doCrop();
        break;          
    case CROPPED_IMAGE:         
        Bundle extras = data.getExtras();
        try{
            if (extras != null) {
                 Bitmap myImage = extras.getParcelable("data");
            }
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
        break;

This code will activate crop action right after you selected the image.

Note that mImageCaptureUri is the selected image URI, it would be pass to intent of cropping action.

Shinigamae
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