安卓：通过片段之间一个JSONObject [英] Android: pass a JSONobject between Fragments
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问题描述
我正在它采用了ListFragment以显示每一天的天气和更多信息的细节片段一点点天气应用程序。我试图让每一个细节片段显示每个列表视图一天相应的天气。以下是code的一些片段：
在ListFragment的部分：
公共类WeatherListFragment扩展ListFragment实现LocationListener的{ 私人最终字符串initialURL =https://api.forecast.io/forecast/8fc2b0556e166fa4670d4014d318152a/;
天气[] myWeatherArray = {};
WeatherAdapter weatherAdapter;
的LocationManager mLocationManager;
串currentLoc;
的JSONObject日; OnWeatherSelectedListener mCallback; // Container活动必须实现此接口使FRAG可以传递消息
公共接口OnWeatherSelectedListener {
通过调用HeadlinesFragment / **当选择列表项* /
公共无效onWeatherSelected（INT位置，字符串数据）;
}@覆盖
公共无效onListItemClick（ListView中升，视图V，INT位置，长的id）{ //与所选项目回调父活动 mCallback.onWeatherSelected（位置，数据）;
l.setItemChecked（位置，真正的）;
}
尝试{
每天的JSONObject = response.getJSONObject（日报）;
JSONArray数据= daily.getJSONArray（数据）;
myWeatherArray =新气象[data.length（）];
的for（int i = 0; I＆LT; myWeatherArray.length;我++）{
天= data.getJSONObject（ⅰ）;
天气myWeatherObject =新气象（）;
myWeatherObject.setmDate（day.getInt（时代））;
myWeatherObject.setmTempMin（day.getInt（temperatureMin））;
myWeatherObject.setmTempMax（day.getInt（temperatureMax））;
myWeatherObject.setIcon（day.getString（图标））;
myWeatherArray [I] = myWeatherObject; } }赶上（JSONException E）{
e.printStackTrace（）;}
主要活动：
公共类MainActivity扩展ActionBarActivity实现WeatherListFragment.OnWeatherSelectedListener { @覆盖
公共无效onWeatherSelected（INT位置，字符串数据）{
//用户选择的文章的标题从HeadlinesFragment
WeatherDetailFragment weatherDetailFragment =（WeatherDetailFragment）getSupportFragmentManager（）findFragmentById（R.id.weather_detail_fragment）。 //一个面板布局
如果（weatherDetailFragment == NULL）{
WeatherDetailFragment onePaneFragment =新WeatherDetailFragment（）; 捆绑ARGS =新包（）;
args.putInt（WeatherDetailFragment.ARG_POSITION，位置）; onePaneFragment.setArguments（参数）; getSupportFragmentManager（）调用BeginTransaction（）
.replace（R.id.container，onePaneFragment）
.addToBackStack（空）
。承诺（）;
细节片段：
公共类WeatherDetailFragment扩展片段{ 最终静态字符串ARG_POSITION =位置; INT mCurrentPosition = -1;
。
。
。
公共无效updateWeatherView（INT位置，字符串数据）{ 视图V = getView（）;
TextView的天=（TextView中）v.findViewById（R.id.dayTextView）;
TextView的日期=（TextView中）v.findViewById（R.id.dateTextView）;
TextView的tempMin =（TextView中）v.findViewById（R.id.tempMinTextView）;
TextView的tempMinF =（TextView中）v.findViewById（R.id.tempMinFTextView）;
TextView的tempMax =（TextView中）v.findViewById（R.id.tempMaxTextView）;
TextView的tempMaxF =（TextView中）v.findViewById（R.id.tempMaxFTextView）;
ImageView的ImageView的=（ImageView的）v.findViewById（R.id.imageView）;
ImageView的imageView2 =（ImageView的）v.findViewById（R.id.imageView2）;
mCurrentPosition =位置;
}
。
。
}
解决方案
传递的JSONObject 如果您使用可以更容易的捆绑对象。转换的JSONObject 到字符串由JSONObject.toString（）方法。然后将其设置为捆绑对象。例如：
捆绑ARGS =新包（）;
串userProfileString = userProfileJsonObject.toString（）;
args.putString（userProfileString，userProfileString）;
fragmentUserProfile.setArguments（参数）;
然后在目标片段中，onCreateView方法中，你可以提取字符串，并将其重新转换到JSONObject的。
字符串userProfileString = getArguments（）的getString（userProfileString）;
的JSONObject的JSONObject =新的JSONObject（userProfileString）;
希望这有助于。
I'm working on a little Weather app which uses a ListFragment to show the weather for each day and a detail fragment with more information. I'm trying to get each detail fragment to show the corresponding weather for each listview day. Here are some snippets of code:
Parts of the ListFragment:
public class WeatherListFragment extends ListFragment implements LocationListener{
private final String initialURL = "https://api.forecast.io/forecast/8fc2b0556e166fa4670d4014d318152a/";
Weather[] myWeatherArray = {};
WeatherAdapter weatherAdapter;
LocationManager mLocationManager;
String currentLoc;
JSONObject day;
OnWeatherSelectedListener mCallback;
// The container Activity must implement this interface so the frag can deliver messages
public interface OnWeatherSelectedListener {
/** Called by HeadlinesFragment when a list item is selected */
public void onWeatherSelected(int position, String data);
}
@Override
public void onListItemClick(ListView l, View v, int position, long id) {
//call back to the parent activity with the selected item
mCallback.onWeatherSelected(position, data);
l.setItemChecked(position, true);
}
try {
JSONObject daily = response.getJSONObject("daily");
JSONArray data = daily.getJSONArray("data");
myWeatherArray = new Weather[data.length()];
for (int i = 0; i < myWeatherArray.length; i++) {
day = data.getJSONObject(i);
Weather myWeatherObject = new Weather();
myWeatherObject.setmDate(day.getInt("time"));
myWeatherObject.setmTempMin(day.getInt("temperatureMin"));
myWeatherObject.setmTempMax(day.getInt("temperatureMax"));
myWeatherObject.setIcon(day.getString("icon"));
myWeatherArray[i] = myWeatherObject;
}
} catch (JSONException e) {
e.printStackTrace();
}
The main activity:
public class MainActivity extends ActionBarActivity implements WeatherListFragment.OnWeatherSelectedListener {
@Override
public void onWeatherSelected(int position, String data) {
// The user selected the headline of an article from the HeadlinesFragment
WeatherDetailFragment weatherDetailFragment = (WeatherDetailFragment)getSupportFragmentManager().findFragmentById(R.id.weather_detail_fragment);
//One pane layout
if(weatherDetailFragment == null) {
WeatherDetailFragment onePaneFragment = new WeatherDetailFragment();
Bundle args = new Bundle();
args.putInt(WeatherDetailFragment.ARG_POSITION, position);
onePaneFragment.setArguments(args);
getSupportFragmentManager().beginTransaction()
.replace(R.id.container, onePaneFragment)
.addToBackStack(null)
.commit();
The detail fragment:
public class WeatherDetailFragment extends Fragment {
final static String ARG_POSITION = "position";
int mCurrentPosition = -1;
.
.
.
public void updateWeatherView(int position, String data) {
View v = getView();
TextView day = (TextView) v.findViewById(R.id.dayTextView);
TextView date = (TextView) v.findViewById(R.id.dateTextView);
TextView tempMin = (TextView) v.findViewById(R.id.tempMinTextView);
TextView tempMinF = (TextView) v.findViewById(R.id.tempMinFTextView);
TextView tempMax = (TextView) v.findViewById(R.id.tempMaxTextView);
TextView tempMaxF = (TextView) v.findViewById(R.id.tempMaxFTextView);
ImageView imageView = (ImageView) v.findViewById(R.id.imageView);
ImageView imageView2 = (ImageView) v.findViewById(R.id.imageView2);
mCurrentPosition = position;
}
.
.
}
解决方案
Passing JSONObject can be easier if you use the Bundle object. Convert the JSONObject to a String by the JSONObject.toString() method. Then set it to the Bundle object. For example:
Bundle args=new Bundle();
String userProfileString=userProfileJsonObject.toString();
args.putString("userProfileString", userProfileString);
fragmentUserProfile.setArguments(args);
Then in the destination fragment, inside the onCreateView method you can extract the String and reconvert it to the JSONObject.
String userProfileString=getArguments().getString("userProfileString");
JSONObject jsonObject=new JSONObject(userProfileString);
Hope this helps.
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