从内部类访问变量“i”，需要声明为 final

Question

I'm trying to send value to another activity intent.putExtra("doctor",String.valueOf(items.get(i))); but it gives error. That's " Variable 'i' is accessed from within inner class, needs to be declared final ". The code is running in the for loop so I can't give final value because it's iterator .

How can we solve it?

Part of code

for (int i = 0; i < c; i++) {
items.add(options[i]);                            
spinnerDialog=new SpinnerDialog(NewActivity.this,items,"Search","Close");// With No Animation
spinnerDialog=new SpinnerDialog(NewActivity.this,items,"Search",R.style.DialogAnimations_SmileWindow,"Close");// With   Animation

spinnerDialog.setCancellable(true); // for cancellable
spinnerDialog.setShowKeyboard(false);// for open keyboard by default
spinnerDialog.bindOnSpinerListener(new OnSpinerItemClick() {
    @Override
    public void onClick(String item, int position) {
        Intent intent = new Intent(NewActivity.this,PrescriptionActivity.class);
        intent.putExtra("doctor",String.valueOf(items.get(i)));
        NewActivity.this.startActivity(intent);

    }
});
findViewById(R.id.show).setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        spinnerDialog.showSpinerDialog();
    }
});

}

Answer 1

The variables used in the anonymous classes implementations (or lambda expressions) must be effectively final, or else the undefined behavior would happen.

I suppose that you want to handle on click action the item at the position obtained from the method using the int position , not from the outer loop. Do the following:

spinnerDialog.bindOnSpinerListener(new OnSpinerItemClick() {
@Override
public void onClick(String item, int position) {
    Intent intent = new Intent(NewActivity.this,PrescriptionActivity.class);
    intent.putExtra("doctor",String.valueOf(items.get(position)));            // here
    NewActivity.this.startActivity(intent);

    }
});