function start(){
    var packageName = Env.packageName();
    if (packageName != "com.wrbug.jsposed") {
        return
    }
    
    //hook MainActivity#onCreate 方法
    JsPosedHelpers.findAndHookMethod("com.wrbug.jsposeddemo.MainActivity", "onCreate", ["android.os.Bundle"], null, function (methodHookParam) {
            //获取thisObject变量
            var activity = JsPosedHelpers.getObjectField(methodHookParam, "thisObject");
            // 获取tv变量
            var tv = JsPosedHelpers.getObjectField(activity, "tv");
            // 获取mCheckBox变量
            var checkbox = JsPosedHelpers.getObjectField(activity, "mCheckBox");
            //通过 idName获取btn
            var btn = JsContext.findViewById(activity, "btn")
            // 设置tv文本
            JsView.setText(tv, "Jsposed running");
            JsView.setText(btn, "点击跳转");
            // 设置tv文本颜色
            JsView.setTextColor(tv, 0xffff0000);
            // 设置tv字体大小
            JsView.setTextSize(tv, 20);
            // 设置tv 点击事件
            JsView.setOnclickListener(tv, function (view) {
                JsView.toggle(checkbox)
            });
            JsView.setOnclickListener(btn, function (view) {
                // 跳转到 Main2Activity
                JsContext.startActivity(activity, "com.wrbug.jsposeddemo.Main2Activity", {
                    "a": "test1",
                    "b": ["test2","java.lang.String"],
                    "c": 12345,
                    "d":[12345,"long"]
                })
            });
            // checkbox 事件监听
            JsView.setOnCheckedChangeListener(checkbox, function (view, isChecked) {
                JsView.setText(tv, "checkBox status:" + isChecked);
            })
        })
    }