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我有兩個非活動類，我需要從一個類發送一個字符串到另一個類，我的方法是使用共享首選項，但無法在第二個類中獲取共享字符串。第一類將運行的每個應用程序打開時，將生成令牌在非活動類之間傳遞字符串
第一類：
public class MyFirebaseInstanceIDService extends FirebaseInstanceIdService {
private static final String TAG = "MyFirebaseIDService";
/**
* Called if InstanceID token is updated. This may occur if the security of
* the previous token had been compromised. Note that this is called when the InstanceID token
* is initially generated so this is where you would retrieve the token.
*/
// [START refresh_token]
@Override
public void onTokenRefresh() {
// Get updated InstanceID token.
String refreshedToken = FirebaseInstanceId.getInstance().getToken();
Log.d(TAG, "Refreshed token: " + refreshedToken);
sendRegistrationToServer(refreshedToken);
}
// [END refresh_token]
/**
* Persist token to third-party servers.
*
* Modify this method to associate the user's FCM InstanceID token with any server-side account
* maintained by your application.
*
* @param token The new token.
*/
public void sendRegistrationToServer(String token) {
// TODO: Implement this method to send token to your app server.
SharedPreferences sp = getSharedPreferences("PUSHToken", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
editor.putString("PUSHToken", token);
editor.commit();
}
}
我試圖傳遞字符串令牌，並存儲在我的第二個非活動課爲我的截擊要求：
public class VolleyPut {
private static final String TAG = "VolleyPut";
private static VolleyPut instance = null;
public static final String KEY_TOKEN = "token";
//for Volley API
public RequestQueue requestQueue;
SharedPreferences sp2=getSharedPreferences("PUSHToken", Context.MODE_PRIVATE);
String token = sp2.getString("PUSHToken", "");
private VolleyPut(Context context)
{
this.token = token;
requestQueue = Volley.newRequestQueue(context.getApplicationContext());
return;
}
public static synchronized VolleyPut getInstance(Context context)
{
if (null == instance)
instance = new VolleyPut(context);
return instance;
}
public static synchronized VolleyPut getInstance()
{
if (null == instance)
{
throw new IllegalStateException(VolleyPut.class.getSimpleName() +
" is not initialized, call getInstance(...) first");
}
return instance;
}
public void VolleyPUT(String domain, String api, final String finalToken, final CustomListener<String> listener){
JSONArray jsonArray = new JSONArray();
JSONObject jsonObject = new JSONObject();
try{
jsonObject.put("token", token);
jsonArray.put(jsonObject);
Log.i("JsonString :", jsonObject.toString());
}catch (Exception e){
System.out.println("Error:" + e);
}
StringRequest sr = new StringRequest(Request.Method.PUT, domain + api,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.e("HttpClient", "success! response: " + response);
if(null != response)
listener.getResult(response);
return;
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
if (null != error.networkResponse)
{
Log.d(TAG + ": ", "Error Response code: " + error.networkResponse.statusCode);
//listener.getResult(false);
}
}
})
{
@Override
public Map<String,String> getHeaders() throws AuthFailureError {
HashMap<String, String> headers= new HashMap<>();
headers.put("Authorization",finalToken);
headers.put("Content-Type","application/json");
headers.put(KEY_TOKEN,token);
return headers;
}
};
requestQueue.add(sr);
}
}
但是我得到錯誤無法解析方法getsharedpreference在我的第二課堂。如何解決這個問題，並且無論如何都要在非活動類之間傳遞字符串？