颤振Android编程关闭/关闭ProgressHUD对话框,无需按
我刚进入Android学习flutter。我想问一下ProgressHUD对话框 如何以编程方式关闭/关闭ProgressHUD对话框?因为在文档中,它使用onPress来关闭对话框。我想要的是在不按onPress的情况下以编程方式关闭对话框 多谢各位 下面ProgressHUD对话框链接的库/包:颤振Android编程关闭/关闭ProgressHUD对话框,无需按,android,ios,flutter,Android,Ios,Flutter,我刚进入Android学习flutter。我想问一下ProgressHUD对话框 如何以编程方式关闭/关闭ProgressHUD对话框?因为在文档中,它使用onPress来关闭对话框。我想要的是在不按onPress的情况下以编程方式关闭对话框 多谢各位 下面ProgressHUD对话框链接的库/包: bool _loading = true; @override void initState() { super.initState(); _progre
bool _loading = true;
@override
void initState() {
super.initState();
_progressHUD = new ProgressHUD(
backgroundColor: Colors.black12,
color: Colors.white,
containerColor: Colors.blue,
borderRadius: 5.0,
text: 'Loading...',
);
//If I put in this line, there have an error,
//the state is null, the dismiss() function called on null.
_progressHUD.state.dismiss();
}
_progressHUD.state.dismiss();
下面的代码是启动对话框的代码:
bool _loading = true;
@override
void initState() {
super.initState();
_progressHUD = new ProgressHUD(
backgroundColor: Colors.black12,
color: Colors.white,
containerColor: Colors.blue,
borderRadius: 5.0,
text: 'Loading...',
);
//If I put in this line, there have an error,
//the state is null, the dismiss() function called on null.
_progressHUD.state.dismiss();
}
_progressHUD.state.dismiss();
您可以看到我是否将\u progressHUD.state.disclose()放入
在函数initState()
中有一个错误,即状态为null,dismise()函数在null引用上调用
下面的代码用于关闭对话框:
bool _loading = true;
@override
void initState() {
super.initState();
_progressHUD = new ProgressHUD(
backgroundColor: Colors.black12,
color: Colors.white,
containerColor: Colors.blue,
borderRadius: 5.0,
text: 'Loading...',
);
//If I put in this line, there have an error,
//the state is null, the dismiss() function called on null.
_progressHUD.state.dismiss();
}
_progressHUD.state.dismiss();
当小部件未完全构建时,您将忽略init状态下的进度。因此,状态null错误正在显示。若要在init state内部或在未完全设置状态时使用它,可以使用postframe回调
WidgetsBinding.instance.addPostFrameCallback((_) {
_progressHUD.state.dismiss();
});