[英]Change background color of button on click and then open a new activity
I am trying to make a Button change its background color and launch a new activity on click. 我正在尝试使Button更改其背景颜色,并在单击时启动新的活动。 Below is the code I wrote, but I am getting error message saying to declare 'Button btn1' as 'final Button btn1'.
下面是我编写的代码,但是我收到一条错误消息,要求将“ Button btn1”声明为“ final Button btn1”。 If I do that, the button change its color on click and launch another activity as I wished, but if returning to Main activity from the new activity, the once changed background color stays permanently.
如果这样做,该按钮将在单击时更改其颜色,并根据需要启动另一个活动,但是如果从新活动返回到主活动,则曾经更改过的背景颜色将永久保留。 How can I improve my code?
如何改善我的代码? Thank you.
谢谢。
public class Home extends ActionBarActivity{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.layout_home);
Button btn1 = (Button) findViewById(R.id.button);
btn1.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
btn1.setBackgroundColor(Color.GRAY);
Intent intent = new Intent(v.getContext(), activity_street.class);
startActivityForResult(intent, 0);
}
});
只需使用onClick
方法的v
参数更改所单击的Button背景的颜色,就无需使btn1
final
:
v.setBackgroundColor(Color.GRAY);
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