Image for ImageButton doesn't change as intend

问题:

My goal here is to change an Image from an ImageButton(ibChamp).

package com.example.custombuilds;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;z
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageButton;

public class Champions extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.champions);

    ImageButton ibAnnie = (ImageButton) findViewById(R.id.ibAnnie);

    ibAnnie.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {
            // TODO Check this for errors
            RelativeLayout test = (RelativeLayout) findViewById(R.id.layoutChampions);
            LayoutInflater layoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            View view = layoutInflater.inflate(R.layout.create_build_page, null);
            test.addView(view);
            ImageButton img = (ImageButton) view.findViewById(R.id.ibChamp);
            img.setImageResource(R.drawable.ic_launcher);

            try {
                Intent open = new Intent("android.intent.action.CREATE");
                startActivity(open);
            } catch (Exception e) {

            }

        }
    });
}
}

Note that the ImageButton ibChamp is from the xml layout create_build_page, and not the xml champions. This code runs without crashing, but the Image from the Imagebutton ibChamp does not change, which is what I am trying to do. I will be happy to provide any other additional information.

回答1:

You are inflating "ibChamp" in onClick. That creates a new ImageButton. You will not see it until you use "addView" from the parent.

You can add your XML, but you need to get a reference to an existing button in Activity in order to change it. Or else add the new button and remove an old one...

In other words, change this:

        LayoutInflater layoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View view = layoutInflater.inflate(R.layout.create_build_page, null);
        ImageButton img = (ImageButton) view.findViewById(R.id.ibChamp);

to this:

        ImageButton img = (ImageButton)findViewById(R.id.ibChamp);

And it will probably do what you want.

回答2:

you need to call addView() for this inflated view

View view = layoutInflater.inflate(R.layout.create_build_page, null);