Remove this line from your index.html file meta http-equiv="Content-Security-Policy" content="default-src 'self' data: gap: https://ssl.gstatic.com 'unsafe-eval'; style-src 'self' 'unsafe-inline'; media-src *; img-src 'self' data: content:;"> and add below one..
...
meta http-equiv="Content-Security-Policy" content="default-src * gap: ws: https://ssl.gstatic.com;style-src * 'unsafe-inline' 'self' data: blob:;script-src * 'unsafe-inline' 'unsafe-eval' data: blob:;img-src * data: 'unsafe-inline' 'self' content:;media-src mediastream;">

Try subscribe it with empty even:
this.toast.showShortCenter("再次点击返回键退出").subscribe();
In my project it works.
BTW my device is Honor V10.
I don't know its reason....

I do have Honor V10 and i didn/t tried with .subscribe() , mine worked by doing above method.

It seems that the toast notifications do not show on Android 8 when using the latest versions of the plugin.

I removed the latest plugin from my project and went back to 2.5.2, and the toasts are working on at least Android 8.0 (e.g. Huawei P Smart) and Android 8.1 (Honor 7S).

ionic cordova plugin rm cordova-plugin-x-toast
ionic cordova plugin add [email protected]

@NorthFred It no works in Honor 8X，Android 8.1.0

@DGGohil I had tried with .subscribe() , but it no worked by doing above method.

@DGGohil I had tried with .subscribe() , but it no worked by doing above method.

PM me your index.html.

@DGGohil

Whether or not there is a sentence above. It doesn't work.

meta charset="utf-8"
meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no, width=device-width, viewport-fit=cover"

meta http-equiv="Content-Security-Policy" content="default-src * gap: ws: https://ssl.gstatic.com;style-src * 'unsafe-inline' 'self' data: blob:;script-src * 'unsafe-inline' 'unsafe-eval' data: blob:;img-src * data: 'unsafe-inline' 'self' content:;media-src mediastream;"

I also encountered this problem, and my device is Xiaomi 8, Android 8.1

I also integrated cordova-plugin-toastyplugin to my project, it works for me.

if (window.cordova&&window.plugins.toastyPlugin) {
window.plugins.toastyPlugin.show(message, 1000, function () {
console.log('totoastyPluginast success');
}, function () {
});
}else if (window.cordova&&window.plugins.toast) {
window.plugins.toast.showShortCenter(message, function (res) {
console.log('toast success');
}, function () { });
} else {
alert(message);
}

I also integrated cordova-plugin-toastyplugin to my project, it works for me.

if (window.cordova&&window.plugins.toastyPlugin) {
window.plugins.toastyPlugin.show(message, 1000, function () {
console.log('totoastyPluginast success');
}, function () {
});
}else if (window.cordova&&window.plugins.toast) {
window.plugins.toast.showShortCenter(message, function (res) {
console.log('toast success');
}, function () { });
} else {
alert(message);
}

Are you talking about ToastyPlugin? I installed it, but I saw that the source code inside it is not very reliable, actually there is alert

@Zhang1051127659

Yeah!, same issue I encountered , you need remove it manually and install again.

it work for me:
Toast.java, find
private static final boolean IS_AT_LEAST_PIE = Build.VERSION.SDK_INT >= 28;
replace with
private static final boolean IS_AT_LEAST_PIE = Build.VERSION.SDK_INT >= 26;

Published 2.7.1 which removes the problematic code entirely.