最近在自定义dialog的时候，在编译写一个例子时。结果编译时出现：
No enclosing instance of type SignOutDialog is accessible. Must qualify the allocation with an enclosing instance of type SignOutDialog (e.g. x.new A() where x is an instance of SignOutDialog).
根据提示，没有可访问的内部类E的实例，必须分配一个合适的内部类E的实例
于是百度谷歌了一下相关资料。原来我写的内部类是动态的，也就是开头以public class开头。而主程序是public static class main。在Java中，类中的静态
方法不能直接调用动态方法。只有将某个内部类修饰为静态类，然后才能够在静态类中调用该类的成员变量与成员方法。
所以在不做其他变动的情况下，最简单的解决办法是将public class改为public static class.
例子：
public static class Builder {//添加static即可！
private Context context;
private String message;
private String title;
private View contentView;
private String positiveButtonText;
private String negativeButtonText;
private DialogInterface.OnClickListener positiveButtonClickListener;
private DialogInterface.OnClickListener negativeButtonClickListener;
public Builder(Context context) {
this.context = context;
}
public Builder setMessage(String message) {//
this.message = message;
return this;
}
public Builder setMessage(int message){
this.message = (String) context.getText(message);
return this;
}
public Builder setTitle(String title) {
this.title = title;
return this;
}
public Builder setTitle(int title){
this.title = (String) context.getText(title);
return this;
}
public Builder setContentView(View v){
this.contentView = v;
return null;
}
public Builder setPositiveButton(String positiveButtonText,OnClickListener onClickListener) {
this.positiveButtonText = positiveButtonText;
this.positiveButtonClickListener = onClickListener;
return this;
}
public Builder setPositiveButton(int positiveButtonText,OnClickListener onClickListener) {
this.positiveButtonText = (String) context.getText(positiveButtonText);
this.positiveButtonClickListener = onClickListener;
return this;
}
public Builder setNegativeButton(String negativeButtonText,OnClickListener onClickListener) {
this.negativeButtonText = negativeButtonText;
this.negativeButtonClickListener = onClickListener;
return this;
}
public Builder setNegativeButton(int negativeButtonText,OnClickListener onClickListener) {
this.negativeButtonText = (String) context.getText(negativeButtonText);
this.negativeButtonClickListener = onClickListener;
return this;
}