Question

我正在进行一项任务，因为我想使用Intent将Array List传递给Next活动。我想在列表视图中显示数据，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arraylist。您可以通过parcelable传递任何对象。将您的arraylist包裹在parcelable中并将其作为额外内容传递，在其他活动中，您可以获得parcelable并获取值。你可以分三步完成。由于很多原因，可以比可序列化更好...可以知道这个问题link

1.示例Arraylist的Parcelable类

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.Bundling parcelable to a intent

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.在第二项活动中获取可从对象获取的内容

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

github中的这个code将为您提供更多帮助......

Answer 2

让 ImageModel 类实现 Serializable 界面。然后传递arraylist作为额外的：

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

然后在您的Activity的onCreate（）中，您可以检索数据：

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

希望它有所帮助。

Answer 3

要么使你的arraylist可序列化serializable所以购买使其内容可序列化，这样你就可以通过捆绑发送你的arraylist到下一个意图。

Answer 4

在发布任何问题之前请先google。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，您的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serializable

public class ImageModel implements Serializable{

           // Generate getter and setter
    }

使用Intent将arrayList传递给下一个活动

5 个答案: