Android中阻止AlertDialog关闭实例代码

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();