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BitmapFactory.decodeFile returns null

I am going to compress the image using the method Bitmap.compress().

But when I get Bitmapusing bitmap = BitmapFactory.decodeFile(), I get the object null, and this method did not rule out any exceptions.

Here is my code

public static File compressImage(String imagePath) throws IOException {

    // Get bitmap
    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    Bitmap bitmap = BitmapFactory.decodeFile(imagePath, options);

    // Get bitmap output stream
    ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
    bitmap.compress(Bitmap.CompressFormat.JPEG, 100, byteArrayOutputStream);

......

When the code runs on the last line, I get a NullPointerException:

java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.graphics.Bitmap.compress(android.graphics.Bitmap$CompressFormat, int, java.io.OutputStream)' on a null object reference

Then I run my code in debug mode, it turned out that I have an object nullfrom the method BitmapFactory.decodeFile.

The parameter imagePathis

/storage/emulated/0/DCIM/Camera/IMG_20160610_195633.jpg

which looks ok.

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AndroidManifest.xml

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
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