当我试图从意图中获取额外时,我收到此错误。 if (empty($_POST['comment']) === true ) {
echo 'ERGHH ! You cannot do this.';
}
else
//this immediate curly brace ends after the HTML form at the end:
{
if (isset($_POST['comment'])) {
$comment = $_POST['comment'];
$comment = mysql_real_escape_string($comment);
$sql_register_hangout = mysqli_query($conn, "UPDATE hangout_comments SET
(comment, comment_corresponding_hangout_id, comment_corresponding_user_id)
SET VALUES
("$comment", "$hangout_id", "$user_data['user_id']")
WHERE comment_id=".$_POST['comment']);
}
/*
then there's the HTML form with a
input type ="textarea" name="comment"
and a submit button input
followed by a closing }
*/
当我更改KEY时,错误变为getIntent().getParcelableArrayListExtra(KEY)
。
我无法理解为什么会这样。有许多Parcelable对象工作正常。这也工作得很好(所以,Parcelable对象没有问题),直到我将其他对象置于意图中并使用不同的键值对,并且可能做错了。有人能告诉我为什么会发生这种错误吗?这种错误背后的原因可能是什么?
您也可以查看日志。
java.lang.NullPointerException
当我更改密钥时,我会在日志中得到这个以及空指针异常
02-24 02:55:21.927 28362-28362/com.abc.app E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.abc.app, PID: 28362
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.abc.app/com.abc.app.activity.FinalActivity}: java.lang.IllegalArgumentException: Duplicate key in ArrayMap: null
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2493)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2555)
at android.app.ActivityThread.access$800(ActivityThread.java:176)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1437)
at android.os.Handler.dispatchMessage(Handler.java:111)
at android.os.Looper.loop(Looper.java:194)
at android.app.ActivityThread.main(ActivityThread.java:5576)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:956)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:751)
Caused by: java.lang.IllegalArgumentException: Duplicate key in ArrayMap: null
at android.util.ArrayMap.validate(ArrayMap.java:555)
at android.os.Parcel.readArrayMapInternal(Parcel.java:2486)
at android.os.BaseBundle.unparcel(BaseBundle.java:221)
at android.os.Bundle.getParcelableArrayList(Bundle.java:848)
at android.content.Intent.getParcelableArrayListExtra(Intent.java:5099)
at com.abc.app.activity.FinalActivity.onCreate(FinalActivity.java:60)
at android.app.Activity.performCreate(Activity.java:6005)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1111)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2446)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2555)
at android.app.ActivityThread.access$800(ActivityThread.java:176)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1437)
at android.os.Handler.dispatchMessage(Handler.java:111)
at android.os.Looper.loop(Looper.java:194)
at android.app.ActivityThread.main(ActivityThread.java:5576)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:956)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:751)
答案 0 :(得分:0)
我的Parcelable类出了问题。我重新制作它,现在它工作正常。
答案 1 :(得分:0)
就我而言,我在我的类Model的writeToParcel
方法中编写了两次相同的密钥,该方法实现了Parcelable
。因此,当它从Bundle保存/检索时,它给我一个错误。
错误的代码:
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(feature_id);
dest.writeString(tab_custom_name);
dest.writeString(sort_order);
dest.writeString(tab_logo_selected_image);
dest.writeString(tab_logo_unselected_image);
dest.writeString(tab_logo_unselected_image);
所以,我删除了在End中写的两条相似的行中的一行。之后无误。
答案 2 :(得分:0)
在我的情况下,因为服务器语言是php并且它返回json String不是标准的。例如,字段' code'可以是String或int,所以我定义了代码'就这样
Object code
。但是当class实现Parcelable时,你必须指定字段类型,如果没有,你将收到错误。
此外,我的解决方案是定义字段' localCode'使用和包裹它。我设置了localCode'当我获得服务器返回数据时的字段。
当然,最好的解决方案是确保服务器返回标准json。
答案 3 :(得分:0)
写入Parcelable并从Parcelable读取的顺序应相同。 或者你把null放在额外内容中。
答案 4 :(得分:0)
在我的情况下,我有两个用于实现Parcelable的类的构造函数,并使用IDE生成了@Override writeToParcel and read parcel
方法,它们具有不同数量的参数。因此我通过使用相同的参数(相同的编号,类型和顺序)删除了多余的参数来解决了这些问题,请参见代码中的注释部分。
public class MediaChannel implements Parcelable {
String name;
String url;
String supportDevice;
String process;
String line;
String icon;
// movies extra fields
String imagePath;
String category;
String duration;
String title;
String description;
String actors;
String years;
String imdb;
public MediaChannel(String name, String url, String process, String icon, String imagePath, String category, String duration, String title, String description, String actors, String years, String imdb) {
this.name = name;
this.url = url;
this.process = process;
this.icon = icon;
this.imagePath = imagePath;
this.category = category;
this.duration = duration;
this.title = title;
this.description = description;
this.actors = actors;
this.years = years;
this.imdb = imdb;
}
public MediaChannel(String name, String url, String supportDevice, String process, String line) {
this.name = name;
this.url = url;
this.supportDevice = supportDevice;
this.process = process;
this.line = line;
}
protected MediaChannel(Parcel in) {
name = in.readString();
url = in.readString();
supportDevice = in.readString();
process = in.readString();
line = in.readString();
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(name);
dest.writeString(url);
dest.writeString(supportDevice);
dest.writeString(process);
dest.writeString(line);
// deleted this part to fix the issues
/*
dest.writeString(icon);
dest.writeString(imagePath);
dest.writeString(category);
dest.writeString(duration);
dest.writeString(title);
dest.writeString(description);
dest.writeString(actors);
dest.writeString(years);
dest.writeString(imdb);
*/
}
}