如何将数组列表 <Object> 传递给另一个活动答案

【问题标题】：how to pass Array list <Object> to another activity如何将数组列表 <Object> 传递给另一个活动
【发布时间】：2017-07-25 12:30:58
【问题描述】：

我将数组列表传递给意图，但给出了错误。所以请告诉我出了什么问题。这是我的代码

用于发送

addToCartList=new ArrayList<>();
Intent intent=new Intent(ShopingCart.this,SelectedProductFromShopingCartShow.class);
intent.putExtra("selectedList", (Serializable) addToCartList);
startActivity(intent);

它是我的接收者代码

public class SelectedProductFromShopingCartShow extends AppCompatActivity{

    ArrayList<ShowProducts> arrayList=new ArrayList<>();
    String condition="SelectedItemsFromShoppingCart";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_selected_product_from_shoping_cart_show);

        arrayList= (ArrayList<ShowProducts>) getIntent().getSerializableExtra("selectedList");

    }
}

这是我的错误

07-25 20:15:54.280 16503-16503/com.sizdom.sizdomstockmanager E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.RuntimeException: Parcel: unable to marshal value ShowProducts{product_name='Almost new', product_photo='http://192.168.1.39:81/sizdom/sizdomstock/product_images/1-Almost-new-17-07-11-10-27-21.jpg', product_sizes=0, product_created_date='null'}
at android.os.Parcel.writeValue(Parcel.java:1235)
at android.os.Parcel.writeList(Parcel.java:622)
at android.os.Parcel.writeValue(Parcel.java:1195)
at android.os.Parcel.writeMapInternal(Parcel.java:591)
at android.os.Bundle.writeToParcel(Bundle.java:1627)
at android.os.Parcel.writeBundle(Parcel.java:605)
at android.content.Intent.writeToParcel(Intent.java:6660)
at android.app.ActivityManagerProxy.startActivity(ActivityManagerNative.java:1865)
at android.app.Instrumentation.execStartActivity(Instrumentation.java:1424)
at android.app.Activity.startActivityForResult(Activity.java:3370)
at android.support.v4.app.BaseFragmentActivityJB.startActivityForResult(BaseFragmentActivityJB.java:50)
at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:79)
at android.app.Activity.startActivityForResult(Activity.java:3331)
at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:859)
at android.app.Activity.startActivity(Activity.java:3566)
at android.app.Activity.startActivity(Activity.java:3534)
at com.sizdom.sizdomstockmanager.ShopingCart$1.onClick(ShopingCart.java:66)
at android.view.View.performClick(View.java:4204)
at android.view.View$PerformClick.run(View.java:17355)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5069)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
07-25 20:20:54.325 700-910/system_process E/InputDispatcher: channel '536cf278 com.sizdom.sizdomstockmanager/com.sizdom.sizdomstockmanager.SplashScrean (server)' ~ Channel is unrecoverably broken and will be disposed!
07-25 20:20:54.325 700-910/system_process E/InputDispatcher: channel '535f9848 com.sizdom.sizdomstockmanager/com.sizdom.sizdomstockmanager.MainActivity (server)' ~ Channel is unrecoverably broken and will be disposed!
07-25 20:20:54.381 21855-21855/? E/Trace: error opening trace file: No such file or directory (2)
07-25 20:20:54.557 21855-21855/? E/dalvikvm: Could not find class 'android.graphics.drawable.RippleDrawable', referenced from method android.support.v7.widget.AppCompatImageHelper.hasOverlappingRendering

ShowProducts 类

public class ShowProducts {
    String product_name;
    String product_photo;
    int product_sizes;
    String product_created_date;
    int size_id;
    String size_name;
    int size_price;
    int size_cost;
    int size_quantity;
    int product_id;

    public int getProduct_id() {
        return product_id;
    }

    public void setProduct_id(int product_id) {
        this.product_id = product_id;
    }

    public String getProduct_name() {
        return product_name;
    }

    public void setProduct_name(String product_name) {
        this.product_name = product_name;
    }

    public String getProduct_photo() {
        return product_photo;
    }

    public void setProduct_photo(String product_photo) {
        this.product_photo = product_photo;
    }

    public int getProduct_sizes() {
        return product_sizes;
    }

    public void setProduct_sizes(int product_sizes) {
        this.product_sizes = product_sizes;
    }

    public String getProduct_created_date() {
        return product_created_date;
    }

    public void setProduct_created_date(String product_created_date) {
        this.product_created_date = product_created_date;
    }

    public int getSize_id() {
        return size_id;
    }

    public void setSize_id(int size_id) {
        this.size_id = size_id;
    }

    public String getSize_name() {
        return size_name;
    }

    public void setSize_name(String size_name) {
        this.size_name = size_name;
    }

    public int getSize_price() {
        return size_price;
    }

    public void setSize_price(int size_price) {
        this.size_price = size_price;
    }

    public int getSize_cost() {
        return size_cost;
    }

    public void setSize_cost(int size_cost) {
        this.size_cost = size_cost;
    }

    public int getSize_quantity() {
        return size_quantity;
    }

    public void setSize_quantity(int size_quantity) {
        this.size_quantity = size_quantity;
    }

}

【问题讨论】：

试试这个例子stackoverflow.com/a/44956149/1548824
发布您的 ShowProducts 课程

标签： android object android-intent arraylist parameter-passing

【解决方案1】：

请在你的模型类中写上ShowProducts implements Serializable。
这将解决问题。

【讨论】：

【解决方案2】：

没有通过意图将对象数组列表从一个活动传递到另一个活动的内置方法。您需要实现 Parcelable 接口。检查文档的开发人员控制台。

https://developer.android.com/reference/android/os/Parcelable.html

【讨论】：

【解决方案3】：

以下代码适用于我：

 Intent intent = new Intent(this, editList.class);
 intent.putStringArrayListExtra("list", list);
 startActivity(intent);

您可以使用以下方法获得结果：

ArrayList<String>() array_list = new ArrayList<String>();

array_list = getIntent().getStringArrayListExtra("list");

【讨论】：

【解决方案4】：

首先，不推荐在Android中将item序列化并作为可序列化列表传递。

Android 提供了一种安全且快速的方式来执行此操作。我们可以使用“Parcelable”接口。使用类似下面的“Parcelable pojo”将您的列表项从一项活动移动到另一项活动。

public class ShowProducts implements Parcelable {

// THis class implents pracellable but does not create a CREATOR field
String product_name;
String product_photo;
int product_sizes;
String product_created_date;
int size_id;
String size_name;
int size_price;
int size_cost;
int size_quantity;
int product_id;

protected ShowProducts(Parcel in) {
    product_name = in.readString();
    product_photo = in.readString();
    product_sizes = in.readInt();
    product_created_date = in.readString();
    size_id = in.readInt();
    size_name = in.readString();
    size_price = in.readInt();
    size_cost = in.readInt();
    size_quantity = in.readInt();
    product_id = in.readInt();
}

public static final Creator<ShowProducts> CREATOR = new Creator<ShowProducts>() {
    @Override
    public ShowProducts createFromParcel(Parcel in) {
        return new ShowProducts(in);
    }

    @Override
    public ShowProducts[] newArray(int size) {
        return new ShowProducts[size];
    }
};

public int getProduct_id() {
    return product_id;
}

public void setProduct_id(int product_id) {
    this.product_id = product_id;
}

public String getProduct_name() {
    return product_name;
}

public void setProduct_name(String product_name) {
    this.product_name = product_name;
}

public String getProduct_photo() {
    return product_photo;
}

public void setProduct_photo(String product_photo) {
    this.product_photo = product_photo;
}

public int getProduct_sizes() {
    return product_sizes;
}

public void setProduct_sizes(int product_sizes) {
    this.product_sizes = product_sizes;
}

public String getProduct_created_date() {
    return product_created_date;
}

public void setProduct_created_date(String product_created_date) {
    this.product_created_date = product_created_date;
}

public int getSize_id() {
    return size_id;
}

public void setSize_id(int size_id) {
    this.size_id = size_id;
}

public String getSize_name() {
    return size_name;
}

public void setSize_name(String size_name) {
    this.size_name = size_name;
}

public int getSize_price() {
    return size_price;
}

public void setSize_price(int size_price) {
    this.size_price = size_price;
}

public int getSize_cost() {
    return size_cost;
}

public void setSize_cost(int size_cost) {
    this.size_cost = size_cost;
}

public int getSize_quantity() {
    return size_quantity;
}

public void setSize_quantity(int size_quantity) {
    this.size_quantity = size_quantity;
}

@Override
public int describeContents() {
    return 0;
}

@Override
public void writeToParcel(Parcel parcel, int i) {
    parcel.writeString(product_name);
    parcel.writeString(product_photo);
    parcel.writeInt(product_sizes);
    parcel.writeString(product_created_date);
    parcel.writeInt(size_id);
    parcel.writeString(size_name);
    parcel.writeInt(size_price);
    parcel.writeInt(size_cost);
    parcel.writeInt(size_quantity);
    parcel.writeInt(product_id);
}

}

您可以使用以下代码将您的数组列表移动到另一个活动。

addToCartList=new ArrayList<>();
    Intent intent=new Intent(ShopingCart.this,SelectedProductFromShopingCartShow.class);
    intent.putParcelableArrayListExtra("selectedList",addToArrayList);
    startActivity(intent);

使用下面的代码在另一个活动中接收它。

getIntent().getParcelableArrayListExtra("selectedList");

对于 Android Studio，实现 Parcelable 接口的快捷键是 ALT+ENTER。只需通过实现 Java 类来实现 Parcelable 接口。 Android studio 会提示你实现和创建 CREATOR 的红色错误。 Android Studio 将为您生成漂亮的代码。而已。享受。

【讨论】：

【解决方案5】：

您的 ShowProducts 对象必须实现 Parcelable。您可以使用以下在线工具轻松使您的对象可打包：http://www.parcelabler.com/

这篇文章可以帮助你：How can I make my custom objects Parcelable?

【讨论】：

【解决方案6】：

请试试这个……

addToCartList=new ArrayList<>();
 Intent intent=new 
 Intent(ShopingCart.this,SelectedProductFromShopingCartShow.class);
 intent.putStringArrayListExtra("selectedList", addToCartList);
 startActivity(intent);

在您的接收活动中...

public class SelectedProductFromShopingCartShow extends AppCompatActivity{
ArrayList<ShowProducts> arrayList=new ArrayList<>();
String condition="SelectedItemsFromShoppingCart";

@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);        
  setContentView(R.layout.activity_selected_product_from_shoping_cart_show);
  arrayList= (ArrayList<ShowProducts>) 
  getIntent().getStringArrayListExtra("selectedList");
}}

【讨论】：