我的数据库中有一些测试值,我想在 android 中获取它们。 这是我的数据库中值的以下 JSON 输出:
[{"email_address":"[email protected]","comment":"qwehgashdgaskdaweq","date_comment":"2014-06-21","time_comment":"08:28:00","password":"rainier1990"},
{"email_address":"[email protected]","comment":"asfasdasdasd","date_comment":"2104-06-12","time_comment":"09:03:00","password":"rainier1990"}
{"email_address":"[email protected]","comment":"asdsfafd","date_comment":"2014-06-22","time_comment":"04:44:00","password":"rainier1990"}]
但是每次我运行此代码时:http://prntscr.com/3vhs5j,它只给我 JSON 输出的第一行。:http://prntscr.com/3vi34b
如何在 android 中显示所有行(而不是 1 行)?
您可以使用android API提供的JSONObject。 JSONObject 有一个名为 getJSONArray() 的方法
http://developer.android.com/reference/org/json/JSONObject.html#getJSONArray(java.lang.String)
你的错误是你正在用你的对象实例化一个JSONArray。你应该尝试这个:
JSONArray myArray =jsonObject.getJSONArray();
这是我的一个应用程序中的一段代码,可以很好地检索 Json 数据。
success = jObject.getInt(TAG_SUCCESS);
vehicles = jObject.getJSONArray(Vehicle.TAG_VEHICLES);
if(success == 1) {
// loop through all the vehicles
for(int i = 0; i < vehicles.length(); i++) {
JSONObject obj = vehicles.getJSONObject(i);
// Get each element based on it's tag
String year = obj.getString(Vehicle.TAG_YEAR);
String model = obj.getString(Vehicle.TAG_MODEL);
String brand = obj.getString(Vehicle.TAG_BRAND);
String color = obj.getString(Vehicle.TAG_COLOR);
String license_plate = obj.getString(Vehicle.TAG_LICENSE);
String main_driver = obj.getString(Vehicle.TAG_DRIVER);
String policeNumber = obj.getString(Vehicle.TAG_POLICENUMBER);
String driversLicense = obj.getString(Vehicle.TAG_DRIVER_LICENSE);
String licenseState = obj.getString(Vehicle.TAG_LICENSE_STATE);
String driverBirthday = obj.getString(Vehicle.TAG_BIRTHDAY_MONTH) + "/" +
obj.getString(Vehicle.TAG_BIRTHDAY_DAY) + "/" +
obj.get(Vehicle.TAG_BIRTHDAY_YEAR);
String driverGender = obj.getString(Vehicle.TAG_DRIVER_GENDER);
ListRowGroup group = new ListRowGroup(brand + " " + year + " " + model, brand);
group.children.add(brand + " " + year + " " + model);
group.children.add(policeNumber);
group.children.add(model);
group.children.add(color);
group.children.add(license_plate);
group.children.add(main_driver);
group.children.add(driversLicense + " - " + licenseState);
group.children.add(driverBirthday + " - " + driverGender);
vehiclesGroup.append(i, group);
}
如果您在问题中添加一些用于获取 JSON 的代码,以便更容易引用,将会有所帮助,但是,我没有看到循环,这就是为什么它只获取第一行。
您可能想参考这个问题:Android/Java中的JSON数组迭代,但基本上使用JSONArray的
length
属性并循环多次。