我想将自定义类的对象传递给另一个活动。我开始知道Parceable比 Serializable 快得多。但是这样做我得到了例外
Key _id expected Parceable but value was java.lang.Long. The default value <null> was returned.
我不知道我做错了什么。我遵循了这些教程：
我的对象实现的代码Parcelable如下：
public class CourseNote implements Parcelable {
private long id;
private String noteDescription;
private String noteTitle;
private String creationDate;
private String notePic;
private String noteAudio;
private String noteVideo;
private long courseID_FK;
// ---------------------------------------------------------------------------
public CourseNote() {
super();
}
// ---------------------------------------------------------------------------
public CourseNote(long id, String noteContent, String noteTitle,
String creationDate, String notePic, String noteAudio,
String noteVideo, long courseID_FK) {
super();
this.id = id;
this.noteDescription = noteContent;
this.noteTitle = noteTitle;
this.creationDate = creationDate;
this.notePic = notePic;
this.noteAudio = noteAudio;
this.noteVideo = noteVideo;
this.courseID_FK = courseID_FK;
}
// ---------------------------------------------------------------------------
// parcel constructor
public CourseNote(Parcel in) {
String[] data = new String[8];
in.readStringArray(data);
this.id = Long.parseLong(data[0]);
this.noteDescription = data[1];
this.noteTitle = data[2];
this.creationDate = data[3];
this.notePic = data[4];
this.noteAudio = data[5];
this.noteVideo = data[6];
this.courseID_FK = Long.parseLong(data[7]);
}
@Override
public void writeToParcel(Parcel dest, int flags) {
// TODO Auto-generated method stub
dest.writeStringArray(new String[] { String.valueOf(this.id),
this.noteDescription, this.noteTitle, this.creationDate,
this.notePic, this.noteAudio, this.noteVideo,
String.valueOf(this.courseID_FK) });
}
public static final Parcelable.Creator<CourseNote> CREATOR = new Creator<CourseNote>() {
@Override
public CourseNote[] newArray(int size) {
// TODO Auto-generated method stub
return new CourseNote[size];
}
@Override
public CourseNote createFromParcel(Parcel source) {
// TODO Auto-generated method stub
return new CourseNote(source);
}
};
@Override
public int describeContents() {
// TODO Auto-generated method stub
return 0;
}
// ---------------------------------------------------------------------------
// I am ignoring setters/getters
}
当用户单击列表项时，我将Parcelable对象发送到其他活动，我onItemClickListner按如下方式执行此操作（但是它工作正常）：
getListView().setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View view,
int position, long id) {
long selectedNoteId = id;
mIntent = new Intent(getActivity(), AddEditNoteActivity.class);
mCursor = (Cursor) mNoteListAdapter2.getItem(position);
mTempCourseNote = new CourseNote(
id,
mCursor.getString(mCursor
.getColumnIndex(CourseNote.COL_CONTENT)),
mCursor.getString(mCursor
.getColumnIndex(CourseNote.COL_TITLE)),
String.valueOf(mCursor.getLong(mCursor
.getColumnIndex(CourseNote.COL_CREATION_DATE))),
"", "", "", mCursor.getLong(mCursor
.getColumnIndex(CourseNote.COL_COURSE_ID_FK)));
mIntent.putExtra("method", "edit");
mIntent.putExtra(CourseNote._ID, mTempCourseNote);
mIntent.putExtra(Course._ID, currentCourseID);
Log.i(StudyManagerDataSource.LOG_TAG, "Going to start activity");
startActivity(mIntent);
}
});
这就是我接收 ParcelAble 对象的方式：
CourseNote mTempCourseNote = (CourseNote) getIntent().getParcelableExtra(
CourseNote._ID);