如何在不将 AppCompatActivity 扩展到类的情况下使用共享首选项?

Question

我需要在我的类中使用共享首选项，但是当我使用getSharedPreferences方法时，它说 "无法解析方法'getSharedPreferences(java.lang.String， int('。代码如下：

public class FetchData extends AsyncTask<Void, Void, Void> {
String data = "";

@Override
protected Void doInBackground(Void... voids) {
try {
URL url = new URL("https://api.jsonbin.io/b/5e42776dd18e4016617690ce/3");
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
String line = "";
while (line != null) {
line = bufferedReader.readLine();
data = data + line;
}

JSONArray JA = new JSONArray(data);
SharedPreferences sharedPreferences = getSharedPreferences("SHARED_PREFS", Context.MODE_PRIVATE); // THE ERROR
SharedPreferences.Editor editor = sharedPreferences.edit();
//            for(int i =0 ;i < JA.length(); i++) {
//                JSONObject JO = (JSONObject) JA.get(i);
//                singleParsed =
//                        "id: " + JO.get("id") + "n" +
//                      "img: " + JO.get("img") + "n" +
//                        "w1: " + JO.get("w1") + "n" +
//                        "w2: " + JO.get("w2") + "n" +
//                        "w3: " + JO.get("w3") + "n" +
//                        "w4: " + JO.get("w4") + "n";
//
//                dataParsed = dataParsed + singleParsed + "n";
//
//            }

Answer 1

你应该这样做，

public class FetchData extends AsyncTask<Void, Void, Void> {
String data = "";
Context context;
FetchData (Context context){
this.context = context;
}
}

和

SharedPreferences sharedPreferences = context.getSharedPreferences("SHARED_PREFS", Context.MODE_PRIVATE);

Answer 2

您可以使用 GitHub 库进行共享Prefrence，这里是链接 - EasyPrefs Library

该库为您提供共享首选项的功能。