android通知栏

目前市场上这么多手机，有很多手机通知栏默认是关闭的。

然而通知栏并没有权限申请的通道，不多说，看代码。

// 检查是否开启通知栏权限
@RequiresApi(api = Build.VERSION_CODES.KITKAT)
public static boolean isNotificationEnabled(Context context){
   String CHECK_OP_NO_THROW = "checkOpNoThrow";
   String OP_POST_NOTIFICATION = "OP_POST_NOTIFICATION";

   AppOpsManager mAppOps = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
   ApplicationInfo appInfo = context.getApplicationInfo();
   String pkg = context.getApplicationContext().getPackageName();
   int uid = appInfo.uid;

   Class appOpsClass = null;
   try {
      appOpsClass = Class.forName(AppOpsManager.class.getName());
      Method checkOpNoThrowMethod = appOpsClass.getMethod(CHECK_OP_NO_THROW, Integer.TYPE, Integer.TYPE,
            String.class);
      Field opPostNotificationValue = appOpsClass.getDeclaredField(OP_POST_NOTIFICATION);

      int value = (Integer) opPostNotificationValue.get(Integer.class);
      return ((Integer) checkOpNoThrowMethod.invoke(mAppOps, value, uid, pkg) == AppOpsManager.MODE_ALLOWED);

   } catch (Exception e) {
      e.printStackTrace();
   }
   return false;
}

if else

if(!ScreenUtils.isNotificationEnabled(MainActivity.this)){
    showNotification();
}else{
    
}

protected void showNotification(){
    AlertDialog notificationDialog = new AlertDialog.Builder(this)
            .setTitle("友情提示").setMessage("发现新版本！请先开启通知栏显示功能,方便下载进度查看！")
            .setNegativeButton("下次更新", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.dismiss();
                }
            }).setPositiveButton("前往设置", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    //跳转设置界面
                    Intent localIntent = new Intent();
                    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);
                }
            })
            .setCancelable(false)
            .create();
    notificationDialog.setCanceledOnTouchOutside(true);
    notificationDialog.show();
}

是不是很方便哈，在更新或者推送的时候提示用户手动去打开通知栏。

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