Java Arraylist到字符串并返回到Arraylist

我想将TestObject的ArrayList转换为字符串，反之亦然。我还附加了主要活动，以便您可以看到我要创建的方法

MainActivity：制作ArrayList并需要将其转换为字符串的地方

public class MainActivity extends AppCompatActivity {
ArrayList<TestObject> testObjects;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    testObjects = new ArrayList<>();
    testObjects.add(new TestObject("Name1", "Attribute1"));
    testObjects.add(new TestObject("Example", "Example"));
}


private String convertObjectArrayToString(ArrayList<TestObject> arrayToBeConverted){
    return null;
}

private ArrayList<TestObject> convertStringToObjectArray(){

    return null;
}

}

---

//ArrayList到字符串转换：

String listToJson = new Gson().toJson(testObjects);

//要获取数组列表的ViceVersa字符串：

Type listType = new TypeToken<List>() {}.getType();

List myModelList = new Gson().fromJson(listToJson, listType);

更新：

 myModelList = gson.fromJson(br, new TypeToken<ArrayList< TestObject >>(){}.getType());

在onCreate方法中首先填充arraylist：

现在调用将arraylist转换为字符串的方法

private String convertObjectArrayToString(ArrayList<TestObject> arrayToBeConverted){

String listString = "";
for (String s : arrayToBeConverted)
{
    listString += s + "\t";
}
System.out.println(listString);
return listString;
}

字符串到arraylist的实现方法

private ArrayList<TestObject> convertStringToObjectArray(){
Gson gson = new Gson();
TypeToken<ArrayList<Publication>> token = new TypeToken<ArrayList<TestObject>>() {
    };
ArrayList<TestObject> pb = gson.fromJson(str, token.getType());
    return testObjects ;
}

---

更改您的数据类：TestObject

    public class TestObject {

    private String name;
    private String attribute;

    TestObject(String name, String attribute){
        this.name = name;
        this.attribute = attribute;
    }

    public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

    public String getAttribute() {
            return attribute;
        }

        public void setAttribute(String attribute) {
            this.attribute = attribute;
        }

    }

用于将中的ArrayList转换为字符串：

    ArrayList<TestObject> testObjects;
     testObjects = new ArrayList<>();
     testObjects.add(new TestObject("Name1", "Attribute1"));   
     testObjects.add(new TestObject("Example", "Example"));

            for (int i=0;i<testObjects.size();i++)
            {

               String name = testObjects.get(i).getName();
               String attribute = testObjects.get(i).getAttribute();

               System.out.println(name);
               System.out.println(attribute);

            }

    You will get the items in the array list as Strings....

---

实现这两种方法的位置？方法位于主要活动ConverObjectArrayString和convertStringToObjectArray中。将getter和setter添加到TestObject中class@CagriYalcin现在将它们添加到代码中，你能分享示例吗？嗨，我喜欢代码，我没有经常使用GSON，但我有一些问题。第一个问题是for循环，它希望我将其更改为对象而不是字符串，您对此有何建议。另一个问题是TypeTokens，应该是TestObject，因为它无法识别变量。您可以将arraylist映射到自定义对象，TypeToken是Gson的类。您好，我尝试过转换回来，但我得到[{attribute=Attribute1，name=Name1}，{attribute=Example，name=Example}]作为响应。如何将其创建回TestObject表单？ArrayList到字符串转换为JSON而不是字符串。两者都是不同的东西

    public class TestObject {

    private String name;
    private String attribute;

    TestObject(String name, String attribute){
        this.name = name;
        this.attribute = attribute;
    }

    public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

    public String getAttribute() {
            return attribute;
        }

        public void setAttribute(String attribute) {
            this.attribute = attribute;
        }

    }

    ArrayList<TestObject> testObjects;
     testObjects = new ArrayList<>();
     testObjects.add(new TestObject("Name1", "Attribute1"));   
     testObjects.add(new TestObject("Example", "Example"));

            for (int i=0;i<testObjects.size();i++)
            {

               String name = testObjects.get(i).getName();
               String attribute = testObjects.get(i).getAttribute();

               System.out.println(name);
               System.out.println(attribute);

            }

    You will get the items in the array list as Strings....