var packageName = "com.google.android.gm";
    var className = "com.google.android.gm.ComposeActivityGmail";
    var action = "android.intent.action.VIEW";
    var category = null;
    var uri = "myfriend@gmail.com";
    var type = "message/rfc822";
 
    var extras = [ 
        {name:"android.intent.extra.EMAIL", type:"list", value:"fred@gmail.com"},
        {name:"android.intent.extra.SUBJECT", type:"string", value:"My subject"},
        {name:"android.intent.extra.TEXT", type:"string", value:"Hello!"} 
    ];
    extras = JSON.stringify( extras );
 
    app.SendIntent( packageName, className, action, category, uri, type, extras );