Activity传递对象集合到Fragment

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我是靠谱客的博主眼睛大荷花，这篇文章主要介绍Activity传递对象集合到Fragment，现在分享给大家，希望可以做个参考。

因为 android.support.v4.app.Fragment 的构造函数是默认的：

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 public Fragment() {
    }

所以传递数据就比较麻烦啦，如果在该Fragment中有一个listview，但其中的数据(List)需要从MainActivity中传过来，要怎么做呢？

可以通过序列化来实现：

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public class DataBean implements Parcelable {
    private String title;
    private String content;

public String getTitle() {
        return title;
    }

public void setTitle(String title) {
        this.title = title;
    }

public String getContent() {
        return content;
    }

public void setContent(String content) {
        this.content = content;
    }

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

@Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(this.title);
        dest.writeString(this.content);
    }

public DataBean() {
    }

protected DataBean(Parcel in) {
        this.title = in.readString();
        this.content = in.readString();
    }

public static final Parcelable.Creator<DataBean> CREATOR = new Parcelable.Creator<DataBean>() {
        @Override
        public DataBean createFromParcel(Parcel source) {
            return new DataBean(source);
        }

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

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public class DataBean implements Parcelable {
    private String title;
    private String content;

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }

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

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(this.title);
        dest.writeString(this.content);
    }

    public DataBean() {
    }

    protected DataBean(Parcel in) {
        this.title = in.readString();
        this.content = in.readString();
    }

    public static final Parcelable.Creator<DataBean> CREATOR = new Parcelable.Creator<DataBean>() {
        @Override
        public DataBean createFromParcel(Parcel source) {
            return new DataBean(source);
        }

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

Parcelable 是Android中的api，其效率要比 Java中的API Serializable效率高。在 Android studio中可以安装 Parcelable generator插件来实现序列化，高效简单。

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 List<DataBean> dataBeanList = new ArrayList<>();
 OneFragment oneFragment = new OneFragment();
        Bundle bundle = new Bundle();
        bundle.putParcelableArrayList("ZJT", (ArrayList<? extends Parcelable>) dataBeanList);
        oneFragment.setArguments(bundle);

        mFragments.add(oneFragment);

然后在 Fragment的 onCreateView方法中通过 getArguments()来获取数据，代码如下：

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 Bundle bundle = getArguments();
        if(bundle != null){
            dataBeanList = bundle.getParcelableArrayList("ZJT");
            listView = (ListView) v.findViewById(R.id.one_fragment_listview);
            listViewAdapter = new ListViewAdapter(getContext(), dataBeanList);
            listView.setAdapter(listViewAdapter);
        }