大家好,又见面了,我是你们的朋友全栈君。
这里是我的应用程序布局:
> onResume()提示用户登录
>如果用户登录,他可以继续使用该应用程序
3.如果用户在任何时候退出,我想再次提示登录
我该如何实现呢?
这里是我的MainActivity:
@Override
protected void onResume(){
super.onResume();
isLoggedIn = prefs.getBoolean(“isLoggedIn”, false);
if(!isLoggedIn){
showLoginActivity();
}
}
这里是我的LoginActivity:
@Override
protected void onPostExecute(JSONObject json) {
String authorized = “200”;
String unauthorized = “401”;
String notfound = “404”;
String status = new String();
try {
// Get the messages array
JSONObject response = json.getJSONObject(“response”);
status = response.getString(“status”);
if(status.equals(authorized)){
Toast.makeText(getApplicationContext(), “You have been logged into the app!”,Toast.LENGTH_SHORT).show();
prefs.edit().putBoolean(“isLoggedIn”,true);
setResult(RESULT_OK, getIntent());
finish();
}
else if (status.equals(unauthorized)){
Toast.makeText(getApplicationContext(), “The username and password you provided are incorrect!”,Toast.LENGTH_SHORT).show();
prefs.edit().putBoolean(“isLoggedIn”,true);
}
else if(status.equals(notfound)){
Toast.makeText(getApplicationContext(), “Not found”,Toast.LENGTH_SHORT).show();
prefs.edit().putBoolean(“isLoggedIn”,true);
}
} catch (JSONException e) {
System.out.println(e);
} catch (NullPointerException e) {
System.out.println(e);
}
}
}
用户成功登录后:
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK) {
Toast.makeText(getApplicationContext(), “BOOM SHAKA LAKA!”,Toast.LENGTH_SHORT).show();
}
}
问题是,onResume()在onActivityResult()之前被调用,所以当用户成功登录时,我的主活动不会得到通知,因为首先调用onResume()。
在哪里是提示登录的最佳地点?
发布者:全栈程序员栈长,转载请注明出处:https://javaforall.cn/144082.html原文链接:https://javaforall.cn