Step-by-Step android Development 66: android image selection,

Step-by-Step android Development 66: android image selection,

I recently made a page to provide feedback on the problem page, which provides a function for users to upload problematic images. I was so stupid that I wanted to list all the images in the system and asked the user to select them. Later I found that I could directly open the api for all images on the mobile phone. Effect

Provide the main code:

1. Select an image

    Intent i = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);    startActivityForResult(i, 1);

2. retrieve images

 

Protected void onActivityResult (int requestCode, int resultCode, Intent data) {super. onActivityResult (requestCode, resultCode, data); try {if (requestCode = 1 & resultCode = RESULT_ OK & null! = Data) {Uri selectedImage = data. getData (); String [] filePathColumn = {MediaStore. images. media. DATA}; Cursor cursor = getContentResolver (). query (selectedImage, filePathColumn, null, null); cursor. moveToFirst (); int columnIndex = cursor. getColumnIndex (filePathColumn [0]); String picturePath = cursor. getString (columnIndex); cursor. close (); BitmapFactory. options opts = new BitmapFactory. optio Ns (); opts. inJustDecodeBounds = true; BitmapFactory. decodeFile (picturePath, opts); opts. inSampleSize = computeSampleSize (opts,-1,160*160); // convert it to a 160*160 size image. // you must set it back to false, because we set it to true opts. inJustDecodeBounds = false; try {Bitmap bmp = BitmapFactory. decodeFile (picturePath, opts); if (mPosition! = 0) // replace {fba. getmImgs (). set (mPosition, bmp); fba. getmImgPaths (). set (mPosition, picturePath);} else {fba. getmImgs (). add (bmp); fba. getmImgPaths (). add (picturePath) ;}} catch (OutOfMemoryError err) {if (err! = Null) {err. printStackTrace () ;}} fba. policydatasetchanged () ;}} catch (Exception e) {if (e! = Null) {e. printStackTrace () ;}} catch (OutOfMemoryError e) {if (e! = Null) {e. printStackTrace ();}}}

   public int computeSampleSize(BitmapFactory.Options options, int minSideLength, int maxNumOfPixels) {        int initialSize = computeInitialSampleSize(options, minSideLength, maxNumOfPixels);        int roundedSize;        if (initialSize <= 8) {            roundedSize = 1;            while (roundedSize < initialSize) {                roundedSize <<= 1;            }        } else {            roundedSize = (initialSize + 7) / 8 * 8;        }        return roundedSize;    }    private int computeInitialSampleSize(BitmapFactory.Options options, int minSideLength, int maxNumOfPixels) {        double w = options.outWidth;        double h = options.outHeight;        int lowerBound = (maxNumOfPixels == -1) ? 1 : (int) Math.ceil(Math.sqrt(w * h / maxNumOfPixels));        int upperBound = (minSideLength == -1) ? 128 : (int) Math.min(Math.floor(w / minSideLength), Math.floor(h / minSideLength));        if (upperBound < lowerBound) {            return lowerBound;        }        if ((maxNumOfPixels == -1) && (minSideLength == -1)) {            return 1;        } else if (minSideLength == -1) {            return lowerBound;        } else {            return upperBound;        }    }

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