Enable generation of default (0-arguments) constructor when extending classes

If the developer extends a base class with no default constructor, they have no way of explicitly specifying that they want a default constructor code to be generated in Java. This is a certain limitation if the class needs to be declared in the AndroidManifest and is instantiated by the system (attempting to use IntentService is one such case - Android will attempt to create an instance of the implementation of IntentService, but will crash, as it tries to invoke a default constructor, which the developer cannot declare).

Given the following Java class:

package a.b;

public class Base {
    public Base(String a) { ... }       
}

and the following implementation in JavaScript:

a.b.Base.extend("a.b.ExtendedBase", {
    init: function() {
     _this("arbitrary string");      
     // -> will introduce additional logic in the sole ctor block
     // in Java, but will not create an additional constructor
    }  
});

will output

package a.b;

@com.tns.JavaScriptImplementation(javaScriptFile = "./ExtendedBase.js")
public class ExtendedBase extends a.b.Base implements com.tns.NativeScriptHashCodeProvider {
        /* No default constructor */

    public ExtendedBase (java.lang.String param_0){
        super(param_0);
                /* 
                    Additional logic to handle more arguments -> a result of the init function
                */                 
        com.tns.Runtime.initInstance(this);
    }

    public boolean equals__super(java.lang.Object other) {
        return super.equals(other);
    }

    public int hashCode__super() {
        return super.hashCode();
    }
}

Developers have no way to declare a default constructor for a.b.ExtendedBase.

Instead what I need is

package a.b;

@com.tns.JavaScriptImplementation(javaScriptFile = "./ExtendedBase.js")
public class ExtendedBase extends a.b.Base implements com.tns.NativeScriptHashCodeProvider {
        /* default constructor */
        public ExtendedBase () {
        this("Arbitrary String");
    }

    public ExtendedBase (java.lang.String param_0){
        super(param_0);
                /* 
                    Additional logic to handle more arguments -> a result of the init function
                */                 
        com.tns.Runtime.initInstance(this);
    }
}

Generating custom constructors based on the javascript code will require additional analysis, and may not be worth looking into at the moment.

该 issue 提供了 JavaScript 和 Java 示例，但没有指明源文件、测试或入口点。首先定位类扩展的构造函数生成路径；完成的标准是：一个没有无参构造函数的基类的扩展能够提供一个按指定方式委托的生成的零参数构造函数，并覆盖所示案例。