使用Intent将arrayList传递到下一个活动

Question

我正在处理一个任务，因为我想使用Intent将数组列表传递给下一个活动。我想在列表视图中显示我也创建了一个适配器的数据，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，您可以获取parcelable和值。您可以在三个steps..Parcelable中完成它，这比可序列化要好得多，因为许多reasons...for都知道这个link

1.数组列表的示例可打包类

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.打包到意图

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.从第二个活动中的对象获取包

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

github中的此将帮助您更多...

Answer 2

使ImageModel类实现Serializable接口。然后将arraylist作为额外参数传递：

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

然后在您的活动的onCreate()中，您可以检索数据：

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

希望能有所帮助。

Answer 3

要么让你的arraylist可序列化serializable，要么让它的内容可序列化，这样你就可以把你的arraylist通过捆绑包发送给下一个intent。