构造函数Intent（new View.OnClickListener（）{}，类 <ChangePasswordActivity> ）未定义

Question

嗨，有错误构造函数Intent（new View.OnClickListener（）{}，Class）未定义，我在该类中创建了Util类，在该布局屏幕注销中创建了弹出布局，更改了密码，例如创建了textview的文本视图onClick i必须调用另一个活动。 当时它显示此错误。

public class Util {


public static void initPopWindow(Activity a, Button button)
{
    final Context context = a;  
    // popupWindow
    View contentView = LayoutInflater.from(a).inflate(R.layout.my_list, null);
 // popupWindow
    contentView.setBackgroundColor(Color.LTGRAY);           
    popupWindow = new PopupWindow(contentView, 340, 249, true);
    contentView.setFocusableInTouchMode(true);      
    popupWindow.setBackgroundDrawable(new BitmapDrawable());
    popupWindow.showAtLocation(button, Gravity.TOP|Gravity.RIGHT, 2, 127);



 change_passwrod_activity.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub


            startActivity((new Intent(this, ChangePasswordActivity.class)));

        }
    });
}

}




main Activity call 
public void onSetting(View v) {
 Util.initPopWindow(this, menubutton)
 }

Answer 1

通常， 此关键字指向当前类，这里您的当前类是Util.java 。

Use activity **context** instead of **this**, because Intent need reference of activity class. It will not accept any other class reference Use activity **context** instead of **this**, because Intent need reference of activity class. It will not accept any other class reference 。

startActivity((new Intent(context, ChangePasswordActivity.class)));

Answer 2

context.startActivity((new Intent(context, ChangePasswordActivity.class)));

Answer 3

change_passwrod_activity.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View v) {
        context.startActivity(new Intent(context, ChangePasswordActivity.class));
    }

});

startActivity（）是Context中的方法，而不是OnClickListener或Util类中的方法。