[TIMOB-24660] Android: Support loading downloaded images from gallery

[garymathews]

• Implement support for content://com.android.providers.downloads.documents paths

TEST CASE

• Download an image on device
• Load the image from the app, it's filesize and filename should show correctly

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

var w = Ti.UI.createWindow({backgroundColor : 'grey'}),
    b = Titanium.UI.createButton({
        title : 'OPEN GALLERY',
        top : '10dp'
    }),
    iv = Ti.UI.createImageView({
        top : '65dp',
        width : '95%'
    }),
    sp = 'android.permission.READ_EXTERNAL_STORAGE';

function openGallery() {
    Ti.Media.openPhotoGallery({
        mediaTypes : [Ti.Media.MEDIA_TYPE_PHOTO],
        success: function(e) {
            iv.height = e.media.height * (iv.rect.width / e.media.width);
            iv.image = e.media;

            alert('filename: ' + e.media.file.name);
            alert('filesize: ' + e.media.length);
        },
        error: function(e) {
            Ti.API.error(JSON.stringify(e));
        }
    });
}

b.addEventListener('click', function(e) {
    if (Ti.Android.hasPermission(sp)) {
        openGallery();
    } else {
        Ti.Android.requestPermissions([sp], function(e) {
            if (e.success) {
                openGallery();
            } else {
                Ti.API.info('ERROR: ' + e.error);
            }
        });
    }
});

w.add(b);
w.add(iv);

w.open();

JIRA Ticket

[ypbnv]

Pass.

[ssjsamir]

FR Passed - Was able to view the correct file size and file name of a downloaded image from the downloads directory without an error.

Test Steps

• Built the SDK form this PR
• Copied the test case from the description and pasted it in to a titanium project
• Ran the program
• Pressed Open Gallery
• Went to Downloads
• Selected a recent image I downloaded
• Was able to view filesize and filename without the application crashing

Environment

Appcelerator Command-Line Interface, version 6.2.0
Nexus 6P device (Android 7.1.2)
Operating System Name: Mac OS X El Capitan
Operating System Version: 10.11.6
Node.js Version: 4.6.0
npm: 4.2.8
Xcode: 8.2
Appcelerator Studio: 4.8.1.201612050850