android开发|Android Intent传递Map及List类型值问题完美解决 android开发|移动开发

问题:

在Android开发中传递Map时特别Map值是自定义Bean时遇到的一些问题,有时抱异常,如以下异常:

java.lang.RuntimeException: Parcelable encountered IOException writing serializable object

原因:

Map或者Bean实体类没有做序列化,或者只实例化了一个

下面是例子:

用到的工具类:CourseItemInfo.java

import java.io.Serializable; /** *注意实体类必须序列化 * Created by yongjie on 2017/1/1. */public class CourseItemInfo implements Serializable { //章节 private Integer section; //课程名称 private String courseName; //视频地址 private String localUrl; public Integer getSection() { return section; }public void setSection(Integer section) { this.section = section; }public String getLocalUrl() { return localUrl; }public void setLocalUrl(String localUrl) { this.localUrl = localUrl; }public String getCourseName() { return courseName; }public void setCourseName(String courseName) { this.courseName = courseName; }@Override public String toString() { return "CourseItemInfo{" + "section=" + section + ", courseName='" + courseName + '\'' + ", localUrl='" + localUrl + '\'' + '}'; } }

MapMapper实现

import android.content.Intent; import java.io.Serializable; import java.util.Map; /** * Created by yongjie on 2017/1/5. */public class MapWrapper implements Serializable {private final T map; public MapWrapper(T map) { this.map = map; }public T getMap() { return map; }public static Intent putMapExtra(Intent intent, String name, T map) {return intent.putExtra(name, new MapWrapper<>(map)); }public static T getMapExtra(Intent intent, String name) throws ClassCastException {Serializable s = intent.getSerializableExtra(name); return s == null ? null : ((MapWrapper) s).getMap(); }

测试方法

public void startActivity(Map courseItemInfoMap) { Intent intent = new Intent(context, TransparentActivity.class); MapWrapper.putMapExtra(intent, "mapWrapper", courseItemInfoMap); startActivity(intent); }public void getActivity(){ Map courseItemInfoMap = MapWrapper.getMapExtra(getIntent(), "mapWrapper"); }

ListMapper实现

import android.content.Intent; import java.io.Serializable; import java.util.List; /** * Created by yongjie on 2017/1/5. */public class ListWrapper implements Serializable {private final T list; public ListWrapper(T list) { this.list = list; }public T getList() { return list; }public static Intent putListExtra(Intent intent, String name, T list) {return intent.putExtra(name, new ListWrapper<>(list)); }public static T getListExtra(Intent intent, String name) throws ClassCastException {Serializable s = intent.getSerializableExtra(name); return s == null ? null : ((ListWrapper) s).getList(); } }

测试方法

public void startActivity(Map courseItemInfo) { Intent intent = new Intent(context, TransparentActivity.class); ListWrapper.putListExtra(intent, "listWrapper", courseItemInfo); startActivity(intent); }public void getActivity(){ List courseItemInfo = ListWrapper.getListExtra(getIntent(), "listWrapper"); }