我有以下课程：实验和测量。我在 Android 活动之间传递一个包含 Experiment 对象的 HashMap 作为值，并将它们的 Experiment.getExperimentName 作为键。
这些 Experiment 对象又包含一个 Measurements 对象的 HashMap。这个 HashMap 有一个 Measurements 对象作为值，它们的 Measurements.getMeasurements 作为键。
这些测量对象然后包含一个双精度的 ArrayList。
我尝试了许多使用捆绑包或直接放入包裹的变体，但是当我在新活动中读取 HashMap 时，我不断收到“解组时出现 ClassNotFoundException：nl.bioinf.thema12.labpal.objects.Measurements”。
我将如何正确实施包裹/包裹？
实验班：
package nl.bioinf.thema12.labpal.objects;
import java.util.HashMap;
//import java.util.Set;
import android.os.Bundle;
import android.os.Parcel;
import android.os.Parcelable;
/**
* @author roy
* a class which describes an experiment
*/
public class Experiment implements Parcelable{
private String experimentName = "";
private HashMap<String,Measurements> measurements = new HashMap<String,Measurements>();
//every Experiment needs a name to make it unique
public Experiment(String experimentName) {
this.experimentName=experimentName;
}
/**
* a method which adds values to a measurement
* @param measurementName the name of the measurement you want to write a value to
* @param measurement the value of the measurement you want to add
* @return the sequence from the fasta
*/
public void addValueToMeasurements(String measurementName, double measurement){
//try to add the measurement
if(measurements.get(measurementName)== null){
Measurements m = new Measurements(measurementName);
m.addMeasurement(measurement);
measurements.put(measurementName,m);
}
//if the measurement does not exist, create it
else{
measurements.get(measurementName).addMeasurement(measurement);
}
}
/**
* a method which returns the experiment name
* @return the experiment name
*/
public String getExperimentName(){
return experimentName;
}
//This makes the object parselable, I don't understand why
/**
* a constructor for the parcelable variant of the object
*/
public Experiment(Parcel in){
measurements = new HashMap<String,Measurements>();
readFromParcel(in);
}
@Override
public int describeContents() {
// TODO Auto-generated method stub
return 0;
}
@Override
/**
* a method which writes the objects to a parcel
*/
public void writeToParcel(Parcel dest, int flags) {
//dest.writeString(experimentName);
//for(String s: (Set<String>)measurements.keySet()){
//dest.writeString(s);
//dest.writeValue(measurements.get(s));
//}
Bundle b = new Bundle();
b.putString("experimentName", experimentName);
b.putSerializable("measurements", measurements);
dest.writeBundle(b);
}
/**
* a method which reads from a parcel
*/
public void readFromParcel(Parcel in){
//experimentName = in.readString();
Bundle b = in.readBundle();
experimentName = b.getString("experimentName");
measurements = (HashMap<String, Measurements>)b.getSerializable("measurements");
}
/**
* generic parcelable creator method
*/
public static final Parcelable.Creator CREATOR =
new Parcelable.Creator() {
public Experiment createFromParcel(Parcel in) {
return new Experiment(in);
}
public Experiment[] newArray(int size) {
return new Experiment[size];
}
};
}
测量类
package nl.bioinf.thema12.labpal.objects;
import java.util.ArrayList;
import android.os.Bundle;
import android.os.Parcel;
import android.os.Parcelable;
/**
* @author roy
* a class which describes a group of measurements
*/
public class Measurements implements Parcelable{
private ArrayList<Double> measurements;
private String measurementName;
//each measurement has at least a name and an empty list of measurements
public Measurements(String measurementName) {
this.measurementName=measurementName;
measurements = new ArrayList<Double>();
}
/**
* a method which adds a measurement to an ArrayList of measurements
* @param measurement a measurement to add to the ArrayList
*/
public void addMeasurement(double measurement){
measurements.add(measurement);
System.out.println("added a measurement");
}
/**
* a method which returns the measurement name
* @return the measurement name
*/
public String getMeasurementName(){
return measurementName;
}
/**
* a method which returns an ArrayList of the values in the measurement
* @return the values of the measurements in an ArrayList
*/
public ArrayList<Double> getMeasurements(){
return measurements;
}
//This makes the object parselable, I don't understand why
/**
* a constructor for the parcelable variant of the object
*/
public Measurements(Parcel in){
measurements = new ArrayList<Double>();
readFromParcel(in);
}
@Override
public int describeContents() {
// TODO Auto-generated method stub
return 0;
}
/**
* a method which writes the objects to a parcel
*/
@Override
public void writeToParcel(Parcel dest, int flags) {
//dest.writeString(measurementName);
//dest.writeList(measurements);
Bundle b = new Bundle();
b.putString("measurementName", measurementName);
b.putSerializable("measurements", measurements);
}
/**
* a method which reads from a parcel
*/
public void readFromParcel(Parcel in){
//measurementName = in.readString();
//measurements = in.readArrayList(Object.class.getClassLoader());
Bundle b = in.readBundle();
measurementName = b.getString("measurementName");
measurements = (ArrayList<Double>)b.getSerializable("measurements");
}
/**
* generic parcelable creator method
*/
public static final Parcelable.Creator CREATOR =
new Parcelable.Creator() {
public Measurements createFromParcel(Parcel in) {
return new Measurements(in);
}
public Measurements[] newArray(int size) {
return new Measurements[size];
}
};
}
接收包的活动代码
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//get the intent passed by the other activity
Bundle b = getIntent().getExtras();
experiment = b.getParcelable("nl.bioinf.thema12.labpal.objects.Experiment");
setContentView(R.layout.activity_show_table);
}
发送捆绑包的活动代码
//setup the table button
table = (Button)findViewById(R.id.button_activityMain_table);
table.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v){
try{
Intent intentToPassToShowTable = new Intent(MainActivity.this, ShowTable.class);
Bundle b = new Bundle();
b.putParcelable("nl.bioinf.thema12.labpal.objects.Experiment", experiments.get(experimentName.getSelectedItem().toString()));
intentToPassToShowTable.putExtras(b);
startActivity(intentToPassToShowTable);
}
catch(Exception e){
e.printStackTrace();
}
}
});