Base64 to PNG in Android Phonegap plugin ERROR

Question

I'm fairly new to Phonegap and Java and trying to save an png to the sdcard. I've been following this post and all steps taken there: Phonegap Plugin:How to convert Base64 String to a PNG image in Android

When I call the saveImage method I only get the alert with: "Invalid action" and I'm not sure why, anyone who has more experience with this particular plugin?

The js code that calls the plugin method:

function onDeviceReady(){
    var myCanvas = getCanvas();
    var myBase64 = myCanvas.toDataURL("image/png");
    //console.log(myBase64);
    //Shows how to use optional parameters
    window.plugins.base64ToPNG.saveImage(myBase64, {filename:"inbjudan.png", overwrite: true}, 
    function(result) {
        alert(result);
    }, function(error) {
        alert(error);
    });
}

I do not know PhoneGap so can't really help you, but just thought i'd warn you that conversion to base64 isn't reliable for anything bigger then a couple of MB. A decent camera picture of 5~10 mb could already cause out-of-memory errors. — Stefan de Bruijn, Mar 28 '13 at 15:24
I'm using canvas to assemble 3 png's the size of a postcard(420x298 px) or smaller with some text so I don't think the size of the outcome will be the problem — Omorose, Mar 28 '13 at 15:58

Adrian Bernal · Answer 1 · 2013-06-05T11:31:11.837

revise your Base64ToPNG.js, the action should be "saveImage"

    Base64ToPNG.prototype.savePDF = function(b64String, params, win, fail) {
        cordovaRef.exec(win, fail, "Base64ToPDF", "saveImage", [b64String, params]);
    };

And the plugin have errors in Base64ToPNG.java Change this

    String b64String = "";
    if (b64String.startsWith("data:image")) {
        b64String = args.getString(0).substring(21);
    } else {
        b64String = args.getString(0);
    }

for

    String b64String = "";
    if (args.getString(0).startsWith("data:image")) {
        b64String = args.getString(0).substring(22);
    } else {
        b64String = args.getString(0);
    }

Now the plugin should format the String correctly.

Base64 to PNG in Android Phonegap plugin ERROR

1 Answers1