在这部分放置什么，以便按钮可以获得第二个按钮的属性？ [英] What to put on this part so the button can get the properties of the second button?

问题描述

public class Activ2 extends Activity implements OnClickListener {
	
	ImageButton butt1,butt2,butt3;
	TextView textview1;
	int buttonHeight =1, buttonWidth =1;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_activ2);
        butt1 = (ImageButton) findViewById(R.id.Butt1);
        textview1 = (TextView)findViewById(R.id.textView1);
        butt1.setOnClickListener(new View.OnClickListener() {
			
			public void onClick(View v) {
				
"What to put on this part so the button can get the properties of the second button?"
 
			}
        });

推荐答案

这是一个闭包，所以butt2和butt3在范围内，如果你在设置butt1的事件处理程序之前分配它们，你可以按名称引用它们，即< br $> b $ b

That's a closure so butt2 and butt3 are in scope, if you assign them before setting butt1's event handler you can just refer to them by name, i.e.

butt1 = (ImageButton) findViewById(R.id.Butt1);
butt2 = (ImageButton) findViewById(R.id.Butt2);
butt1.setOnClickListener(new View.OnClickListener() {
  public void onClick(View v) {
    butt2.Text = "whatever";
  }
});

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