Android的Parcelable - RetailerOrderActivity.java返回NULL [英] Android Parcelable -- RetailerOrderActivity.java return null
本文介绍了Android的Parcelable - RetailerOrderActivity.java返回NULL的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我要通过一个活动到另一个活动：
I have to pass one activity to another activity:
我有SalesProduct enetity类：
I have SalesProduct enetity class:
public class Product implements Parcelable{
private double availableQuantity;
private double price;
private String productCode;
private String description;
private String description2;
private String productGroup;
private String alternateSearch;
private String productTypeCode;
private String nonStockItemFlag;
private String salableFlag;
private double weight;
private double qty;
private double grossValue;
private double value;
private ArrayList<Product> product;
public Product() {
}
public Product(Parcel in) {
this();
readFromParcel(in);
}
/*
* Constructor calls read to create object
*/
private void readFromParcel(Parcel in) {
in.readTypedList(product, Product.CREATOR); /* NULLPOINTER HERE */
}
public int describeContents() {
return 0;
}
public void writeToParcel(Parcel dest, int flags) {
dest.writeList(product);
}
public static final Parcelable.Creator<Product> CREATOR = new Parcelable.Creator<Product>() {
public Product createFromParcel(Parcel in) {
Product prod = new Product();
Bundle b = in.readBundle(Product.class.getClassLoader());
prod.product = b.getParcelableArrayList("enteredProduct");
return prod;
}
public Product[] newArray(int size) {
return new Product[size];
}
};
/**
* @param product
*/
public Product(ArrayList<Product> product) {
this.product = product;
}
/**
* @param availableQuantity
* @param price
* @param productCode
* @param description
* @param nonStockItemFlag
* @param kitProductFlag
* @param qty
* @param grossValue
* @param value
*/
public Product(double availableQuantity, double price, String productCode,
String description, String nonStockItemFlag,
double qty, double value) {
super();
this.availableQuantity = availableQuantity;
this.price = price;
this.productCode = productCode;
this.description = description;
this.nonStockItemFlag = nonStockItemFlag;
this.qty = qty;
this.value = value;
}
public ArrayList<Product> getProduct() {
return product;
}
public void setProduct(ArrayList<Product> product) {
this.product = product;
}
public double getValue() {
return value;
}
public void setValue(double value) {
this.value = value;
}
public double getGrossValue() {
return grossValue;
}
public void setGrossValue(double grossValue) {
this.grossValue = grossValue;
}
public double getQty() {
return qty;
}
public void setQty(double qty) {
this.qty = qty;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
public double getAvailableQuantity() {
return availableQuantity;
}
public void setAvailableQuantity(double availableQuantity) {
this.availableQuantity = availableQuantity;
}
public String getProductCode() {
return productCode;
}
public void setProductCode(String productCode) {
this.productCode = productCode;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getDescription2() {
return description2;
}
public void setDescription2(String description2) {
this.description2 = description2;
}
public String getProductGroup() {
return productGroup;
}
public void setProductGroup(String productGroup) {
this.productGroup = productGroup;
}
public String getAlternateSearch() {
return alternateSearch;
}
public void setAlternateSearch(String alternateSearch) {
this.alternateSearch = alternateSearch;
}
public String getProductTypeCode() {
return productTypeCode;
}
public void setProductTypeCode(String productTypeCode) {
this.productTypeCode = productTypeCode;
}
public String getNonStockItemFlag() {
return nonStockItemFlag;
}
public void setNonStockItemFlag(String nonStockItemFlag) {
this.nonStockItemFlag = nonStockItemFlag;
}
public String getSalableFlag() {
return salableFlag;
}
public void setSalableFlag(String salableFlag) {
this.salableFlag = salableFlag;
}
public double getWeight() {
return weight;
}
public void setWeight(double weight) {
this.weight = weight;
}
}
和来电者的活动：
if(productMap.size() >0){
ArrayList<Product> enteredProductList = new ArrayList<Product>(productMap.values());
Bundle b = new Bundle();
Product pr =new Product(enteredProductList);
b.putParcelableArrayList("enteredProduct", enteredProductList);
Intent showContent = new Intent(getApplicationContext(),RetailerOrderIActivity.class);
showContent.putExtras(b); //Insert the Bundle object in the Intent' Extras
startActivity(showContent);
}else{
Toast.makeText(RetailerOrderActivity.this," You don't have invoice records" ,Toast.LENGTH_SHORT).show();
}
和接收部分：
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.order_main);
Bundle b = this.getIntent().getExtras();
ArrayList<Product> p = b.getParcelableArrayList("enteredProduct");
System.out.println("-- RetailerOrderIActivity --" + p.size());
for (Product s : p) {
System.out.println(" --Qty-" + s.getQty());
System.out.println(" --price -" + s.getPrice());
System.out.println(" --code -" + s.getProductCode());
}
这是我的错误的部分：
09-13 16:22:43.236: ERROR/AndroidRuntime(343): FATAL EXCEPTION: main
09-13 16:22:43.236: ERROR/AndroidRuntime(343): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.xont.controller/com.xont.controller.sales.RetailerOrderIActivity}: java.lang.NullPointerException
09-13 16:22:43.236: ERROR/AndroidRuntime(343): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
09-13 16:22:43.236: ERROR/AndroidRuntime(343): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
09-13 16:22:43.236: ERROR/AndroidRuntime(343): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
09-13 16:22:43.236: ERROR/AndroidRuntime(343): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
09-13 16:22:43.236: ERROR/AndroidRuntime(343): at android.os.Handler.dispatchMessage(Handler.java:99)
09-13 16:22:43.236: ERROR/AndroidRuntime(343): at android.os.Looper.loop(Looper.java:123)
09-13 16:22:43.236: ERROR/AndroidRuntime(343): at android.app.ActivityThread.main(ActivityThread.java:3683)
09-13 16:22:43.236: ERROR/AndroidRuntime(343): at java.lang.reflect.Method.invokeNative(Native Method)
09-13 16:22:43.236: ERROR/AndroidRuntime(343): at java.lang.reflect.Method.invoke(Method.java:507)
09-13 16:22:43.236: ERROR/AndroidRuntime(343): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
09-13 16:22:43.236: ERROR/AndroidRuntime(343): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
09-13 16:22:43.236: ERROR/AndroidRuntime(343): at dalvik.system.NativeStart.main(Native Method)
09-13 16:22:43.236: ERROR/AndroidRuntime(343): Caused by: java.lang.NullPointerException
09-13 16:22:43.236: ERROR/AndroidRuntime(343): at com.xont.entity.Product$1.createFromParcel(Product.java:94)
09-13 16:22:43.236: ERROR/AndroidRuntime(343): at com.xont.entity.Product$1.createFromParcel(Product.java:1)
09-13 16:22:43.236: ERROR/AndroidRuntime(343): at android.os.Parcel.readParcelable(Parcel.java:1981)
09-13 16:22:43.236: ERROR/AndroidRuntime(343): at android.os.Parcel.readValue(Parcel.java:1846)
09-13 16:22:43.236: ERROR/AndroidRuntime(343): at android.os.Parcel.readListInternal(Parcel.java:2092)
09-13 16:22:43.236: ERROR/AndroidRuntime(343): at android.os.Parcel.readArrayList(Parcel.java:1536)
09-13 16:22:43.236: ERROR/AndroidRuntime(343): at android.os.Parcel.readValue(Parcel.java:1867)
09-13 16:22:43.236: ERROR/AndroidRuntime(343): at android.os.Parcel.readMapInternal(Parcel.java:2083)
09-13 16:22:43.236: ERROR/AndroidRuntime(343): at android.os.Bundle.unparcel(Bundle.java:208)
09-13 16:22:43.236: ERROR/AndroidRuntime(343): at android.os.Bundle.getParcelableArrayList(Bundle.java:1144)
09-13 16:22:43.236: ERROR/AndroidRuntime(343): at com.xont.controller.sales.RetailerOrderIActivity.onCreate(RetailerOrderIActivity.java:18)
09-13 16:22:43.236: ERROR/AndroidRuntime(343): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
09-13 16:22:43.236: ERROR/AndroidRuntime(343): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
请帮忙me..its返回null ......哪里错了？请指点我一下吗？
Please help me..its return null ... where is wrong ?please advice me on this?
在此先感谢
推荐答案
下面是你可以通过一个ArrayList，因为我尝试过了。
Here is how you can pass an ArrayList as I tried it.
MyListClass.java - 自定义的类
public class MyListClass implements Parcelable{
private int test;
public MyListClass()
{}
public MyListClass(Parcel read){
test = read.readInt();
}
public int getTest() {
return test;
}
public void setTest(int test) {
this.test = test;
}
public static final Parcelable.Creator<MyListClass> CREATOR =
new Parcelable.Creator<MyListClass>() {
@Override
public MyListClass createFromParcel(Parcel source) {
return new MyListClass(source);
}
@Override
public MyListClass[] newArray(int size) {
return new MyListClass[size];
}
};
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel arg0, int arg1) {
arg0.writeInt(test);
}
}
MyParcelable.java
public class MyParcelable implements Parcelable {
private List<MyListClass> arrList = new ArrayList<MyListClass>();
private int myInt = 0;
private String str = null;
public String getStr() {
return str;
}
public void setStr(String str) {
this.str = str;
}
public List<MyListClass> getArrList() {
return arrList;
}
public void setArrList(List<MyListClass> arrList) {
this.arrList = arrList;
}
public int getMyInt() {
return myInt;
}
public void setMyInt(int myInt) {
this.myInt = myInt;
}
MyParcelable() {
// initialization
arrList = new ArrayList<MyListClass>();
}
public MyParcelable(Parcel in) {
myInt = in.readInt();
str = in.readString();
in.readTypedList(arrList, MyListClass.CREATOR);
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel outParcel, int flags) {
outParcel.writeInt(myInt);
outParcel.writeString(str);
outParcel.writeTypedList(arrList);
}
public static final Parcelable.Creator<MyParcelable> CREATOR = new Parcelable.Creator<MyParcelable>() {
@Override
public MyParcelable createFromParcel(Parcel in) {
return new MyParcelable(in);
}
@Override
public MyParcelable[] newArray(int size) {
return new MyParcelable[size];
}
};
}
MainAcitivty.java
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
arrList.add(new MyListClass());
arrList.get(0).setTest(200);
MyParcelable object = new MyParcelable();
object.setMyInt(100);
object.setArrList(arrList);
Intent intent = new Intent(MainActivity.this,ReceiverParcel.class);
intent.putExtra("parcel", object);
startActivity(intent);
}
ReceiverParcel.java
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Bundle b = getIntent().getExtras();
MyParcelable object = b.getParcelable("parcel");
System.out.println(object.getArrList().get(0).getTest());
System.out.println(object.getMyInt());
}
这篇关于Android的Parcelable - RetailerOrderActivity.java返回NULL的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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