Android如何关闭AlertDialog.Builder对话框呢？AlertDialog.Builder对话框没有类似finish()或者dismiss()这样的方法。

但是它的父类AlertDialog有dismiss方法，而且AlertDialog.Builder在.show()的时候会得到一个AlertDialog对象，我们就可以用dismiss方法将该Builder关闭。

AlertDialog.Builder builder = new AlertDialog.Builder(this); 
AlertDialog dialog = builder.show(); 
dialog.dismiss(); 

关于Android阻止AlertDialog关闭具体代码如下所示：

AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setTitle("测试");
LayoutInflater inflater = getActivity().getLayoutInflater();
View view = inflater.inflate(R.layout.dialogfragment_num_input, null);
builder.setView(view);
builder.setPositiveButton("确定",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int id) {
Field field = null;
try {
//通过反射获取dialog中的私有属性mShowing
field = dialog.getClass().getSuperclass().getDeclaredField("mShowing");
field.setAccessible(true);//设置该属性可以访问
} catch (Exception ex) {
}
String inputValue = String.valueOf(mEdit.getText());
if (inputValue == null || "".equals(inputValue)) {
try {
//设置dialog不可关闭
field.set(dialog, false);
dialog.dismiss();
} catch (Exception ex) {
}
} else {
//
//做自己的事
//
try {
//关闭
field.set(dialog, true);
dialog.dismiss();
} catch (Exception ex) {
}
}
}
});
builder.setNegativeButton("取消",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int id) {
Field field = null;
try {
//通过反射获取dialog中的私有属性mShowing
field = dialog.getClass().getSuperclass().getDeclaredField("mShowing");
field.setAccessible(true);//设置该属性可以访问
} catch (Exception ex) {
}
try {
field.set(dialog, true);
dialog.dismiss();
} catch (Exception ex) {
}
}
});
builder.create();