[]截屏文件没有保存

截图没有保存成功，在相应的路径找不到图片
参考的教程是:https://ldc.layabox.com/doc/?nav=zh-js-7-2-7
if( window.conch )
{
console.log("i'm here 1");
window.conch.captureScreen(function(arrayBuff,width,height){
conch.saveAsPng(arrayBuff,width,height,conch.getCachePath()+"/test.png" );
console.log("i'm here 2:" + arrayBuff.byteLength + " " + width + " " + height);
console.log(conch.getCachePath()+"/test.png");
});
}
输出的日志是(安卓平台)：
03-05 19:47:45.937 9306-9431 I/LayaBox: i'm here 1
03-05 19:47:45.937 9306-9431 E/LayaBox: >>>>>>>>>>>>>>>>>>>>>>>>>>>>className:layaair/game/browser/ExportJavaFunction,methodName：captureScreen
03-05 19:47:45.937 9306-9431 E/LayaBox: >>>>>>>>>>>>before
03-05 19:47:45.940 9306-9431 E/LayaBox: >>>>>>>>>>>>after
03-05 19:47:45.982 9306-9392 I/dalvikvm-heap: Grow heap (frag case) to 21.565MB for 12582928-byte allocation
03-05 19:47:49.848 9306-9392 E/temp: >>>>>>>>>>>>>>>>>>>>>>>useTimenew3906
03-05 19:47:50.534 9306-9431 I/LayaBox: i'm here 2:12582912 2048 1536
03-05 19:47:50.534 9306-9431 I/LayaBox: /data/data/xxx//LayaCache//appCache/test.png