我的代码在保存内部存储时遇到了某种逻辑问题。我在类 pet 中创建了两个方法来加载和保存我试图保存和加载 pet 实例的位置。我在 logcat 中没有收到任何错误消息，但是当我退出然后再次打开应用程序时没有保存任何内容。
package Model;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import edu.chl.dat255.sofiase.readyforapet.CreatePet;
import android.content.Context;
public class Pet implements Serializable{
/**
*
*/
private static final long serialVersionUID = 1L;
PetMood petMood = new PetMood();
private int hungerCounter;
private int walkCounter;
private int playCounter;
/**
* Method that increases mood bar while eating
*
* @return String with the pet's reaction
*/
public String eat() {
//walkCounter = petMood.getWalkMood();
hungerCounter = petMood.getFoodMood();
//playCounter = petMood.getPlayMood();
if (hungerCounter < 5) {
hungerCounter = hungerCounter + 1;
petMood.setFoodMood(hungerCounter);
return "Yummie!";
}
else{
return "I am full";
}
}
/**
* Method that increases mood bar while walking
* and decides that the dog can't walk when it is too hungry or too tired
*
* @return String with the pet's reaction
*/
public String walk() {
walkCounter = petMood.getWalkMood();
hungerCounter = petMood.getFoodMood();
playCounter = petMood.getPlayMood();
if (hungerCounter < 3 && walkCounter < 5)
return "I'm too hungry!";
else if (playCounter + walkCounter > 6)
return "I'm tired! I want to rest!";
else if (walkCounter < 5) {
walkCounter = walkCounter + 1;
petMood.setWalkMood(walkCounter);
return "Yeey! Great exercise!";
}
else{
return "I'm tired! I want to rest!";
}
}
/**
* Method that increases mood bar while playing
* and decides that the dog can't play when it is too hungry or too tired
*
* @return String with the pet's reaction
*/
public String play() {
walkCounter = petMood.getWalkMood();
hungerCounter = petMood.getFoodMood();
playCounter = petMood.getPlayMood();
if (playCounter + walkCounter > 6) {
return "I'm tired! I want to rest!";
}
else if (hungerCounter <3 && playCounter < 5)
return "I'm too hungry!";
else if (playCounter < 5 ) {
playCounter = playCounter + 1;
petMood.setPlayMood(playCounter);
return "Yeey! Lots of fun!";
}
else{
return "I'm tired! I want to rest!";
}
}
public void save(String FILENAME, Context context) throws FileNotFoundException, IOException{
FileOutputStream fos = context.openFileOutput(FILENAME, Context.MODE_PRIVATE);
ObjectOutputStream savedPet = new ObjectOutputStream(fos);
savedPet.writeObject(context.getApplicationContext());
savedPet.close();
}
public static Pet load(String FILENAME, Context context) throws FileNotFoundException, IOException, ClassNotFoundException{
FileInputStream fis = context.openFileInput(FILENAME);
ObjectInputStream ois = new ObjectInputStream(fis);
Pet pet = (Pet) ois.readObject();
ois.close();
CreatePet.setPet(pet);
return pet;
}
}
package edu.chl.dat255.sofiase.readyforapet;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.Serializable;
import Model.Dog;
import Model.Pet;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
public class CreatePet extends Activity implements OnClickListener, Serializable { //lagt till interface serializivble. kanske inte n�dv�ndigt
/**
*
*/
private static final long serialVersionUID = 1L;
String petName;
private static Dog dog;
String FILENAME = "pet_file.dat";//lagts till f�r nullpointerexeption
/**
* onCreate Method
*
*
* @param savedInstanceState - Bundle
*/
@Override
protected void onCreate (Bundle savedInstanceState) {
super.onCreate (savedInstanceState);
setContentView(R.layout.createpet);
Button create = (Button) findViewById(R.id.puppy_settings);
create.setOnClickListener(this);
}
public void onClick (View v){
startActivity(new Intent(CreatePet.this, PetActivity.class));
EditText setName = (EditText) findViewById(R.id.edit_pet_name);
petName = setName.getText().toString();
dog = new Dog(petName);
try {
dog.save("pet_file.dat", this);
} catch (FileNotFoundException e) {
System.out.print("File not found kastad i CreatePet");
e.printStackTrace();
} catch (IOException e) {
System.out.print("IOException kastad i CreatePet");
e.printStackTrace();
}
}
/**
* getPet Method
*
* makes the created pet available to other classes
*
* @return dog - an instance of the class Dog
*/
public static Pet getPet(){
return dog;
}
/**
* getPet Method
*
* makes the created pet available to other classes
*
* @return dog - an instance of the class Dog
*/
public static void setPet(Pet pet){
dog = (Dog) pet;
}
}
package edu.chl.dat255.sofiase.readyforapet;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.Serializable;
import Model.Pet;
import Model.Dog;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class SelectGame extends Activity implements Serializable {// la till f�r att objektet m�ste vara serializible
private static final long serialVersionUID = 1L;
TextView failMessage;
String FILENAME = "pet_file.dat";// lgts till f�r nullpointerexep
/**
* onCreate method
*
* @param savedInstanceState - Bundle
*/
@Override
protected void onCreate (Bundle savedInstanceState) {
super.onCreate (savedInstanceState);
setContentView(R.layout.selectgame);
//The continue button reacts to a click and starts PetActivity
Button continuePreviousGame = (Button) findViewById(R.id.continuegame);
continuePreviousGame.setOnClickListener(new OnClickListener() {
/**
* Method onClick for the continue previous game button
*
* @param v - View
*/
public void onClick (View v){
try {
Pet.load("pet_file.dat",SelectGame.this);
} catch (FileNotFoundException e) {
System.out.print("File not found ");
e.printStackTrace();
} catch (IOException e) {
System.out.print("IO Exception ");
e.printStackTrace();
} catch (ClassNotFoundException e) {
System.out.print("Class not found exception ");
e.printStackTrace();
}
if (CreatePet.getPet() != null){
startActivity(new Intent(SelectGame.this, PetActivity.class));
}
else{
failMessage = (TextView) findViewById(R.id.failmessage);
failMessage.setText("Create a pet first!");
}
}
}
);
//To send the button CreateNewPet to the activity CreatePet
Button createNewPet = (Button) findViewById(R.id.createnewpet);
createNewPet.setOnClickListener(new OnClickListener() {
/**
* Method onClick for the create new pet button
*
* @param v - View
*/
public void onClick (View v){
startActivity(new Intent(SelectGame.this, CreatePet.class));
}
}
);
}
}