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[英]Convert ArrayList<ArrayList<String>> “back” to ArrayList<String>
[英]Arraylist to string and back to arraylist
我想將(TestObject)的ArrayList轉換為String,反之亦然。 我還附加了主要活動,因此您可以看到我要創建的方法。
MainActivity:創建ArrayList的位置,需要將其轉換為String。
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中的對象:
public class TestObject {
private String name;
private String attribute;
TestObject(String name, String attribute){
this.name = name;
this.attribute = attribute;
}
public void setAttribute(String attribute) {
this.attribute = attribute;
}
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
public String getAttribute() {
return attribute;
}
}
// ArrayList轉換為String Convert:
String listToJson = new Gson().toJson(testObjects);
// ViceVersa String獲取數組列表:
Type listType = new TypeToken<List>() {}.getType();
List myModelList = new Gson().fromJson(listToJson, listType);
更新:
myModelList = gson.fromJson(br, new TypeToken<ArrayList< TestObject >>(){}.getType());
首先在onCreate()
方法中填充arraylist:
@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"));
convertObjectArrayToString(testObjects)
}
現在調用將arraylist轉換為字符串的方法
private String convertObjectArrayToString(ArrayList<TestObject> arrayToBeConverted){
String listString = "";
for (String s : arrayToBeConverted)
{
listString += s + "\t";
}
System.out.println(listString);
return listString;
}
實現字符串到arraylist的方法
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 ;
}
更改您的數據類: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;
}
}
要將ArrayList轉換為String:
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....
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