समय त्रुटि (Parcelable का उपयोग करना)

Question

मैं Parcelable

का उपयोग करते हुए मैं एक कक्षा बनाएं है और यह नाम एक और करने के लिए एक गतिविधि से वस्तु कक्षा पास करने के लिए छात्र

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 

    } 

} 

की कोशिश की

मुख्य गतिविधि मैं इस कोड का उपयोग Obejct पारित करने के लिए ...

   Student st = new Student("aaa","bbb","ccc"); 
       Intent intent = new Intent(MainActivity.this,Main2Activity.class); 
       intent.putExtra("stu", st); 
       startActivity(intent); 

दूसरा गतिविधि में (पुनः प्राप्त एक)

मैं का उपयोग इस कोड (त्रुटि यहाँ है)

Student model = (Student)getIntent().getParcelableExtra("stu"); 

LogCat त्रुटि

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 

Answer 1

आप लिख सकते हैं और पार्सल से अपने वर्ग के खेतों को पढ़ने के लिए कोड को लागू करने की जरूरत है।

writeToParcel में:

@Override 
public void writeToParcel(Parcel dest, int flags) { 
     dest.writeString(st_AcadimicNumber); 
     dest.writeString(st_Name); 
     dest.writeString(st_Class); 
} 

पार्सल निर्माता:

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]; 
    } 
}; 

और निर्माता:

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(); 
} 

और यह किया है।

सादर