Android Studio有一个弹出窗口,告诉我在运行SDK管理器并再次启动Android Studio后可以获得更新我得到另一个popoup,请求我到Androids网站,它告诉我应该升级到Java JDK 8和JRE 8之后我做了我尝试运行调试时遇到235错误.我卸载了版本8并重新安装了7u80 JDK和JRE,现在我已经减少了34个错误.当我输入java -version时,我得到1.8.073这里都是35个错误.
Error:java.lang.UnsupportedClassVersionError: com/android/dx/command/Main : Unsupported major.minor version 52.0
Error:java.lang.UnsupportedClassVersionError: com/android/dx/command/Main : Unsupported major.minor version 52.0
Error: at java.lang.ClassLoader.defineClass1(Native Method)
Error: at java.lang.ClassLoader.defineClass1(Native Method)
Error: at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
Error: at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
Error: at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
Error: at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
Error: at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
Error: at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
Error: at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
Error: at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
Error: at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
Error: at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
Error: at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
Error: at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
Error: at java.security.AccessController.doPrivileged(Native Method)
Error: at java.security.AccessController.doPrivileged(Native Method)
Error: at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
Error: at java.net.URLClassLoader.findClass(URLClassLoader.java:354) …我正在尝试使用Postman测试FCM,但即使FCM令牌存在,我总是会收到以下错误.我在Cloud Messaging选项卡中获得了令牌:Firebase Cloud Messaging令牌.
<HTML>
<HEAD>
<TITLE>The request was missing an Authentification Key (FCM Token). Please, refer to section "Authentification" of the FCM documentation, at https://firebase.google.com/docs/cloud-messaging/server.</TITLE>
</HEAD>
这是我发送的内容.
POST /fcm/send HTTP/1.1
Host: fcm.googleapis.com
Cache-Control: no-cache
Postman-Token: 9109eb13-245f-0786-21a5-6207f5426b44
Content-Type:application/json
Authorization:key=AAAAfnYrKvU:APA91bFwgeM3zuFId6UDzvIHk9qZ3lKHnX-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
{ "data": { "message": "This is a Firebase Cloud Messaging Topic Message!", } }:
我用文本创建了一个位图,我可以在Imageview中查看它,但是当我保存位图时,我只得到一个黑色图像.我花了三个小时看类似的问题,但没有一个对我有用.这是代码.谢谢你的帮助.
public void createBitmap(){
Bitmap LabelBitmap;
FileOutputStream fos = null;
//create Text Bitmap
LabelBitmap = textAsBitmap(this,"BRO D 0813","fonts/arialbd.ttf", 4, Color.BLACK);
//load bitmap in to Imageview
ImageView myImageView = (ImageView) findViewById(R.id.imageView);
myImageView.setImageBitmap(LabelBitmap);
// save bitmap
String root = Environment.getExternalStorageDirectory().toString();
File myDir = new File(root + "/myfolder");
myDir.mkdirs();
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
LabelBitmap.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
if (!myDir.exists()) {
myDir.mkdir();
}
File myDirFile = new File(root +"/myfolder/mybitmap.jpg");
try {
if(myDirFile.exists()){
myDirFile.delete();
}
myDirFile.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
try { …我正在尝试将以下代码更改为 UIAlertController 但我收到一条错误消息“不可调用成员‘UIAlertController’不能像方法一样使用”
这是 AppDelegate.cs 中的原始代码
private void remoteNotificationPayload(NSDictionary userInfo)
{
var aps_d = userInfo["aps"] as NSDictionary;
var alert_d = aps_d["alert"] as NSDictionary;
var body = alert_d["body"] as NSString;
var title = alert_d["title"] as NSString;
this.showAlert(title, body);
}
private void showAlert(string title, string message)
{
var alert = new UIAlertView(title ?? "Title", message ?? "Message", null, "Cancel", "OK");
alert.Show();
}
我试过这就是我得到错误的地方：
private void showAlert(string title, string message)
{
var okCancelAlertController = UIAlertController(title ?? "Title", message ?? "Message", preferredStyle: UIAlertControllerStyle.Alert);
okCancelAlertController.AddAction(UIAlertAction.Create("OK", …我有一个看起来像这样的JSON文件，我正在尝试对其进行解码，但是没有运气：
[
{
"FirstName": "Kim",
"Surname": "Jensen"
},
{
"FirstName": "Amery",
"Surname": "Mcmillan"
},
{
"FirstName": "Denton",
"Surname": "Burnett"
}
...
]
将uJson与Delphi 2007结合使用，我知道当数组具有如下名称时如何提取数据：
{
"Names": [
{
"FirstName": "Kim",
"Surname": "Jensen"
},
{
"FirstName": "Amery",
"Surname": "Mcmillan"
},
{
"FirstName": "Denton",
"Surname": "Burnett"
}
...
]
}
var
json: TJSONObject;
Text: String;
i: Integer;
begin
json := TJSONObject.create(jsontext);
for i:=0 to json.getJSONArray('Names').Length -1 do
begin
Text := json.getJSONArray('Names').getJSONObject(i).optString('FirstName');
...
end;
end;
但是，这个数组没有名字，我已经尝试了几乎所有我能想到的东西，但是这个简单的事情却花了我几个小时才能弄清楚。