使用 Intent 将 arrayList 传递给下一个活动

Question

我正在处理一项任务，我想使用 Intent 将数组列表传递给下一个活动。 我想在列表视图中显示数据，因为我也创建了一个适配器，但问题是如何在意图中传递数组列表。

private ArrayList<ImageModel> test(){

    ArrayList results = new ArrayList();

    ImageModel newsData = new ImageModel();

    newsData.setQuestions("Q1.who belongs to melanistic color variant of any Panthera species");
    newsData.setImageView(R.drawable.ic_blackpanther);
    results.add(newsData);

    newsData = new ImageModel();

    newsData.setQuestions("Q2.who can run faster than any other land animal");
    newsData.setImageView(R.drawable.ic_chita);
    results.add(newsData);

    newsData = new ImageModel();

    newsData.setQuestions("Q3.who is belongs to family Elephantidae and the order Proboscidea");
    newsData.setImageView(R.drawable.ic_elephant);
    results.add(newsData);

    newsData = new ImageModel();

    newsData.setQuestions("Q4.Which animal is historically used in warfare");
    newsData.setImageView(R.drawable.ic_horse);
    results.add(newsData);

    newsData = new ImageModel();

    newsData.setQuestions("Q5.Which animal is united by their distinctive black and white stripes on his body");
    newsData.setImageView(R.drawable.ic_zebra);
    results.add(newsData);


    return results;
}

Answer 1

您可以使用 parcelabale 传递数组列表。您可以通过 parcelable 传递任何对象。将您的数组列表包装在 parcelable 中并将其作为附加内容传递，在其他活动中您可以获得 parcelable 并获取值。您可以分三个步骤完成。由于许多原因，Parcelable 比可序列化更好...因为知道这个link 退出

1. Arraylist 的 Parcelable 类示例

public class SampleParcelable implements Parcelable {
    String carName;
    String modelNumber;
    String carMake;
    int carPrice;

    public String getCarName() {
        return carName;
    }

    public void setCarName(String carName) {
        this.carName = carName;
    }

    public String getModelNumber() {
        return modelNumber;
    }

    public void setModelNumber(String modelNumber) {
        this.modelNumber = modelNumber;
    }

    public String getmMake() {
        return carMake;
    }

    public void setmMake(String mMake) {
        this.carMake = mMake;
    }

    public int getPrice() {
        return carPrice;
    }

    public void setPrice(int price) {
        carPrice = price;
    }

    @Override
    public int describeContents() {

        return 0;
    }

    public static final Parcelable.Creator<SampleParcelable> CREATOR = new Creator<SampleParcelable>() {

        public SampleParcelable createFromParcel(Parcel source) {

            SampleParcelable mBook = new SampleParcelable();
            mBook.carName = source.readString();
            mBook.carMake = source.readString();
            mBook.modelNumber = source.readString();
            mBook.carPrice = source.readInt();
            return mBook;

        }

        public SampleParcelable[] newArray(int size) {

            return new SampleParcelable[size];

        }

    };

    @Override
    public void writeToParcel(Parcel mParcel, int flags) {
        mParcel.writeString(carName);
        mParcel.writeString(modelNumber);
        mParcel.writeString(carMake);
        mParcel.writeInt(carPrice);
    }

}

2.将parcelable绑定到一个意图

Intent pIntent = new Intent(this, SecondActivity.class);
Bundle pBundle = new Bundle();
pBundle.putParcelable(PAR_KEY, mCar);
pIntent.putExtras(pBundle);

//starting next Activity with intent
startActivity(pIntent);

3.在第二个活动中从对象中获取parcelable

SampleParcelable mObjCar =(SampleParcelable)getIntent().getParcelableExtra(FirstActivity.PAR_KEY);

github 上的这个code 会帮助你更多...

Answer 2

让您的 ImageModel 类实现 Serializable 接口。然后将arraylist作为额外的传递：

Intent intent = new Intent(getApplicationContext(), MyActivityClass.class);
    intent.putExtra("list", results);
    startActivity(intent);

然后在你的 Activity 的 onCreate() 中你可以检索数据：

ArrayList<ImageModel> list = (ArrayList<ImageModel>)getIntent().getSerializableExtra("list");

希望对你有帮助。

Answer 3

要么让您的数组列表可序列化serializable，所以请购买使其内容可序列化，这样您就可以通过捆绑将您的数组列表发送到下一个意图。

Answer 4

在发布任何问题之前请先谷歌。 无论如何尝试下面的代码

    ArrayList<ImageModel> modelList= new ArrayList<ImageModel>();
    Bundle bundle = new Bundle();
    bundle.putSerializable("array_list", modelList);
    intent.putExtras(bundle);

对于上面的代码，你的 ImageModel 类应该被序列化。

Answer 5

MainActivity.class

private ArrayList<ImageModel> listItem;

Bundle bundle = new Bundle();
bundle.putSerializable("array_list",listItem);
Intent intent = new Intent(getApplicationContext(), MyActivityClass.class);
intent.putExtra(intent);
startActivity(intent);

// and to another Activity get it as.

Intent intent=this.getIntent();
Bundle bundle=intent.getExtras();

 ArrayList<ImageModel> listItem= 
   (ArrayList<ImageModel>)bundle.getSerializable("array_list");

ImageModel.class 你需要 ImageModel 类为 putSerializable 实现可序列化

public class ImageModel implements Serializable{

           // Generate getter and setter
    }