protected onCreate(savedInstanceState: android.os.Bundle): void {
        if (!this._callbacks) {
            setActivityCallbacks(this);
        }

        this._callbacks.onCreate(this, savedInstanceState, super.onCreate);
    }

    protected onCreate(savedInstanceState: any): void { // android.os.Bundle
        // Set isNativeScriptActivity in onCreate (as done in the original NativeScript activity code).
        // The JS constructor might not be called because the activity is created from Android.
        this.isNativeScriptActivity = true;

        if (!this._callbacks) {
            setActivityCallbacks(this);
        }

        this._callbacks.onCreate(this, savedInstanceState, super.onCreate);
    }

 protected onActivityResult(requestCode: number, resultCode: number, data: any): void { // android.content.Intent
     this._callbacks.onActivityResult(this, requestCode, resultCode, data, super.onActivityResult);
 }

 public onRequestPermissionsResult(requestCode: number, permissions: Array<String>, grantResults: Array<number>): void {
     this._callbacks.onRequestPermissionsResult(this, requestCode, permissions, grantResults, undefined /*TODO: Enable if needed*/);
 }

 public onBackPressed(): void {
     this._callbacks.onBackPressed(this, super.onBackPressed);
 }

 protected onDestroy(): void {
     this._callbacks.onDestroy(this, super.onDestroy);
 }

 protected onStop(): void {
     this._callbacks.onStop(this, super.onStop);
 }

 protected onStart(): void {
     this._callbacks.onStart(this, super.onStart);
 }

 protected onSaveInstanceState(outState: any): void { // android.os.Bundle
     this._callbacks.onSaveInstanceState(this, outState, super.onSaveInstanceState);
 }