我试图使用Parcelable将对象类从一个活动传递给另一个
我创建了一个班级,并将其命名为学生
package com.example.test08_passobjectoverintent;
import android.os.Parcel;
import android.os.Parcelable;
public class Student implements Parcelable
{
private String st_AcadimicNumber ;
private String st_Name ;
private String st_Class ;
public String getSt_AcadimicNumber() {
return st_AcadimicNumber;
}
public void setSt_AcadimicNumber(String st_AcadimicNumber) {
this.st_AcadimicNumber = st_AcadimicNumber;
}
public String getSt_Name() {
return st_Name;
}
public void setSt_Name(String st_Name) {
this.st_Name = st_Name;
}
public String getSt_Class() {
return st_Class;
}
public void setSt_Class(String st_Class) {
this.st_Class = st_Class;
}
public Student(String st_AcadimicNumber,String st_Name,String st_Class) {
super();
this.st_AcadimicNumber = st_AcadimicNumber;
this.st_Name = st_Name;
this.st_Class = st_Class;
}
public Student() {
super();
}
@Override
public int describeContents() {
// Todo Auto-generated method stub
return 0;
}
@Override
public void writetoParcel(Parcel dest,int flags) {
// Todo Auto-generated method stub
}
}
在主要活动中我使用此代码传递Obejct …
Student st = new Student("aaa","bbb","ccc");
Intent intent = new Intent(MainActivity.this,Main2Activity.class);
intent.putExtra("stu",st);
startActivity(intent);
在第二个活动(检索一个)
Student model = (Student)getIntent().getParcelableExtra("stu");
LogCat错误
12-09 15:50:06.068: E/Trace(30655): error opening trace file: No such file or directory (2) 12-09 15:50:06.188: D/libEGL(30655): loaded /system/lib/egl/libEGL_mali.so 12-09 15:50:06.188: D/libEGL(30655): loaded /system/lib/egl/libGLESv1_CM_mali.so 12-09 15:50:06.193: D/libEGL(30655): loaded /system/lib/egl/libGLESv2_mali.so 12-09 15:50:06.193: D/(30655): Device driver API match 12-09 15:50:06.193: D/(30655): Device driver API version: 10 12-09 15:50:06.193: D/(30655): User space API version: 10 12-09 15:50:06.193: D/(30655): mali: REVISION=Linux-r2p4-02rel0 BUILD_DATE=Wed Sep 12 17:53:53 KST 2012 12-09 15:50:06.218: D/Openglrenderer(30655): Enabling debug mode 0 12-09 15:50:08.033: D/GestureDetector(30655): [Surface Touch Event] mSweepDown False,mlrsDCnt : -1 mTouchCnt : 4 mFalseSizeCnt:0 12-09 15:50:08.123: D/AndroidRuntime(30655): Shutting down VM 12-09 15:50:08.123: W/dalvikvm(30655): threadid=1: thread exiting with uncaught exception (group=0x40e372a0) 12-09 15:50:08.128: E/AndroidRuntime(30655): FATAL EXCEPTION: main 12-09 15:50:08.128: E/AndroidRuntime(30655): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.test08_passobjectoverintent/com.example.test08_passobjectoverintent.Main2Activity}: android.os.BadParcelableException: Parcelable protocol requires a Parcelable.Creator object called CREATOR on class com.example.test08_passobjectoverintent.Student 12-09 15:50:08.128: E/AndroidRuntime(30655): at android.app.ActivityThread.performlaunchActivity(ActivityThread.java:2100) 12-09 15:50:08.128: E/AndroidRuntime(30655): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125) 12-09 15:50:08.128: E/AndroidRuntime(30655): at android.app.ActivityThread.access$600(ActivityThread.java:140) 12-09 15:50:08.128: E/AndroidRuntime(30655): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1227) 12-09 15:50:08.128: E/AndroidRuntime(30655): at android.os.Handler.dispatchMessage(Handler.java:99) 12-09 15:50:08.128: E/AndroidRuntime(30655): at android.os.Looper.loop(Looper.java:137) 12-09 15:50:08.128: E/AndroidRuntime(30655): at android.app.ActivityThread.main(ActivityThread.java:4898) 12-09 15:50:08.128: E/AndroidRuntime(30655): at java.lang.reflect.Method.invokeNative(Native Method) 12-09 15:50:08.128: E/AndroidRuntime(30655): at java.lang.reflect.Method.invoke(Method.java:511) 12-09 15:50:08.128: E/AndroidRuntime(30655): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1008) 12-09 15:50:08.128: E/AndroidRuntime(30655): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:775) 12-09 15:50:08.128: E/AndroidRuntime(30655): at dalvik.system.NativeStart.main(Native Method) 12-09 15:50:08.128: E/AndroidRuntime(30655): Caused by: android.os.BadParcelableException: Parcelable protocol requires a Parcelable.Creator object called CREATOR on class com.example.test08_passobjectoverintent.Student 12-09 15:50:08.128: E/AndroidRuntime(30655): at android.os.Parcel.readParcelable(Parcel.java:2086) 12-09 15:50:08.128: E/AndroidRuntime(30655): at android.os.Parcel.readValue(Parcel.java:1965) 12-09 15:50:08.128: E/AndroidRuntime(30655): at android.os.Parcel.readMapInternal(Parcel.java:2226) 12-09 15:50:08.128: E/AndroidRuntime(30655): at android.os.Bundle.unparcel(Bundle.java:223) 12-09 15:50:08.128: E/AndroidRuntime(30655): at android.os.Bundle.getParcelable(Bundle.java:1165) 12-09 15:50:08.128: E/AndroidRuntime(30655): at android.content.Intent.getParcelableExtra(Intent.java:4451) 12-09 15:50:08.128: E/AndroidRuntime(30655): at com.example.test08_passobjectoverintent.Main2Activity.onCreate(Main2Activity.java:22) 12-09 15:50:08.128: E/AndroidRuntime(30655): at android.app.Activity.performCreate(Activity.java:5191) 12-09 15:50:08.128: E/AndroidRuntime(30655): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094) 12-09 15:50:08.128: E/AndroidRuntime(30655): at android.app.ActivityThread.performlaunchActivity(ActivityThread.java:2064) 12-09 15:50:08.128: E/AndroidRuntime(30655): ... 11 more
解决方法
您需要实现代码来编写和读取parcel中的类字段.
在writetoParcel中：
@Override public void writetoParcel(Parcel dest,int flags) { dest.writeString(st_AcadimicNumber); dest.writeString(st_Name); dest.writeString(st_Class); }
包裹创作者：
public static final Parcelable.Creator<Track> CREATOR
= new Parcelable.Creator<Track>() {
public Student createFromParcel(Parcel in) {
return new Track(in);
}
public Student[] newArray(int size) {
return new Track[size];
}
};
和构造函数：
public Student (Parcel source){
/*
* Reconstruct from the Parcel. Keep same order as in writetoParcel()
*/
st_AcadimicNumber = source.readString();
st_Name = source.readString();
st_Class = source.readString();
}
它已经完成了.
问候
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