我要评论先上效果：
**
1、权限
**
1.1、判断是否拥有权限
NotificationManagerCompat.from(this).areNotificationsEnabled();
没错只要这一行代码，若果拥有权限则打印日志返回true
1.2、用户手动打开权限
Intent localIntent = new Intent();
//直接跳转到应用通知设置的代码：
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {//8.0及以上
localIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
localIntent.setAction("android.settings.APPLICATION_DETAILS_SETTINGS");
localIntent.setData(Uri.fromParts("package", getPackageName(), null));
} else if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {//5.0以上到8.0以下
localIntent.setAction("android.settings.APP_NOTIFICATION_SETTINGS");
localIntent.putExtra("app_package", getPackageName());
localIntent.putExtra("app_uid", getApplicationInfo().uid);
} else if (android.os.Build.VERSION.SDK_INT == Build.VERSION_CODES.KITKAT) {//4.4
localIntent.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
localIntent.addCategory(Intent.CATEGORY_DEFAULT);
localIntent.setData(Uri.parse("package:" + getPackageName()));
} else {
//4.4以下没有从app跳转到应用通知设置页面的Action，可考虑跳转到应用详情页面,
localIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
if (Build.VERSION.SDK_INT >= 9) {
localIntent.setAction("android.settings.APPLICATION_DETAILS_SETTINGS");
localIntent.setData(Uri.fromParts("package", getPackageName(), null));
} else if (Build.VERSION.SDK_INT <= 8) {
localIntent.setAction(Intent.ACTION_VIEW);
localIntent.setClassName("com.android.settings", "com.android.setting.InstalledAppDetails");
localIntent.putExtra("com.android.settings.ApplicationPkgName", getPackageName());
}
}
startActivity(localIntent);
目前我所知道的只能跳转到这里了，有更好的欢迎指点
1.3、完整代码
if (!NotificationManagerCompat.from(this).areNotificationsEnabled()) {
//未打开通知
AlertDialog alertDialog = new AlertDialog.Builder(this)
.setTitle("提示")
.setMessage("请在“通知”中打开通知权限")
.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
})
.setPositiveButton("去设置", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
Intent localIntent = new Intent();
//直接跳转到应用通知设置的代码：
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {//8.0及以上
localIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
localIntent.setAction("android.settings.APPLICATION_DETAILS_SETTINGS");
localIntent.setData(Uri.fromParts("package", getPackageName(), null));
} else if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {//5.0以上到8.0以下
localIntent.setAction("android.settings.APP_NOTIFICATION_SETTINGS");
localIntent.putExtra("app_package", getPackageName());
localIntent.putExtra("app_uid", getApplicationInfo().uid);
} else if (android.os.Build.VERSION.SDK_INT == Build.VERSION_CODES.KITKAT) {//4.4
localIntent.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
localIntent.addCategory(Intent.CATEGORY_DEFAULT);
localIntent.setData(Uri.parse("package:" + getPackageName()));
} else {
//4.4以下没有从app跳转到应用通知设置页面的Action，可考虑跳转到应用详情页面,
localIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
if (Build.VERSION.SDK_INT >= 9) {
localIntent.setAction("android.settings.APPLICATION_DETAILS_SETTINGS");
localIntent.setData(Uri.fromParts("package", getPackageName(), null));
} else if (Build.VERSION.SDK_INT <= 8) {
localIntent.setAction(Intent.ACTION_VIEW);
localIntent.setClassName("com.android.settings", "com.android.setting.InstalledAppDetails");
localIntent.putExtra("com.android.settings.ApplicationPkgName", getPackageName());
}
}
startActivity(localIntent);
}
})
.create();
alertDialog.show();
alertDialog.getButton(DialogInterface.BUTTON_NEGATIVE).setTextColor(Color.BLACK);
alertDialog.getButton(AlertDialog.BUTTON_POSITIVE).setTextColor(Color.RED);
}
2、通知与订阅
效果图在最开始，直接上实现代码
2.1、通知
NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
Notification notification = new NotificationCompat.Builder(this, "chat")
.setContentTitle("收到一条聊天消息")
.setContentText("今天中午吃什么？")
.setWhen(System.currentTimeMillis())
.setSmallIcon(R.drawable.ic_launcher_background)
.setLargeIcon(BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher_background))
.setAutoCancel(true)
.build();
manager.notify(1, notification);
2.2、订阅
NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
Notification notification = new NotificationCompat.Builder(this, "subscribe")
.setContentTitle("收到一条订阅消息")
.setContentText("地铁沿线30万商铺抢购中！")
.setWhen(System.currentTimeMillis())
.setSmallIcon(R.drawable.ic_launcher_background)
.setLargeIcon(BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher_background))
.setAutoCancel(true)
.build();
manager.notify(2, notification);
参考地址：
通知与订阅：https://blog.csdn.net/guolin_blog/article/details/79854070
权限：https://blog.csdn.net/aiynmimi/article/details/102740139?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-1.channel_param&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-1.channel_param
本文地址：https://blog.csdn.net/weixin_44259937/article/details/107952559
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