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我有一个后台服务,如果存在新数据,它会从服务器请求新数据,它会更新sharedpreferences我的 firebase 作业中的通知显示命令,该命令显示 0、20 秒之间的通知。

通知每 20 秒显示一次,这意味着我的工作正常,但我onSharedPreferenceChanged没有监听为工作服务所做的更改。

有什么方法可以监听来自 Job.sharedPreferences 的更改。

家庭活动

public class HomeActivity extends AppCompatActivity
        implements NavigationView.OnNavigationItemSelectedListener
        ,SharedPreferences , SharedPreferences.OnSharedPreferenceChangeListener
{


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        testUtils.myjob(this);
        setContentView(R.layout.activity_home);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        ......

        defaultSetup();
    }


    private void defaultSetup() {

        SharedPreferences shared = PreferenceManager.getDefaultSharedPreferences(this);

        shared.registerOnSharedPreferenceChangeListener(this);
    }
    @Override
    protected void onResume() {
        super.onResume();
        SharedPreferences shared = PreferenceManager.getDefaultSharedPreferences(this);

        shared  .registerOnSharedPreferenceChangeListener(this);
    }

    @Override
    protected void onPause() {
        super.onPause();
        SharedPreferences shared = PreferenceManager.getDefaultSharedPreferences(this);

        shared.unregisterOnSharedPreferenceChangeListener(this);
    }

    @Override
    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {


//        if (key.equals(Preferences.LIST)) {
//            Toast.makeText(this, "cool", Toast.LENGTH_LONG).show();
//        }
//        if (key.equals(Preferences.CHAT_LIST)) {

        Log.e("Cool","cooooooooooooool");
            Toast.makeText(this, "cool", Toast.LENGTH_LONG).show();
//        }
    }

    @Override
    public Map<String, ?> getAll() {
        return null;
    }

    @Nullable
    @Override
    public String getString(String key, @Nullable String defValue) {
        return null;
    }

    @Nullable
    @Override
    public Set<String> getStringSet(String key, @Nullable Set<String> defValues) {
        return null;
    }

    @Override
    public int getInt(String key, int defValue) {
        return 0;
    }

    @Override
    public long getLong(String key, long defValue) {
        return 0;
    }

    @Override
    public float getFloat(String key, float defValue) {
        return 0;
    }

    @Override
    public boolean getBoolean(String key, boolean defValue) {
        return false;
    }

    @Override
    public boolean contains(String key) {
        return false;
    }

    @Override
    public Editor edit() {
        return null;
    }

    @Override
    public void registerOnSharedPreferenceChangeListener(OnSharedPreferenceChangeListener listener) {

    }

    @Override
    public void unregisterOnSharedPreferenceChangeListener(OnSharedPreferenceChangeListener listener) {

    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        PreferenceManager.getDefaultSharedPreferences(this)
                .unregisterOnSharedPreferenceChangeListener(this);

    }
}

Firebase 作业服务

public class FirebaseJobService extends com.firebase.jobdispatcher.JobService{


    @Override
    public boolean onStartJob(com.firebase.jobdispatcher.JobParameters job) {
        String url = ApiUtil.getNewMessage();
        final Context context = this;
        StringRequest stringRequest = new StringRequest(Request.Method.GET, url,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        JSONArray arr;
                        try {
                            arr = new JSONArray(response);
                            SharedPreferences pref1 = getSharedPreferences(Preferences.LIST, 0);
                            String chatList = pref1.getString(Preferences.CHAT_LIST, "[]");
                            arr = Utils.concatArray(arr, new JSONArray(chatList));
                            SharedPreferences.Editor editor = pref1.edit();
                            editor.putString(Preferences.CHAT_LIST, arr.toString());
                            editor.apply();
                            NotificationUtils.show(context);
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }

                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
            }
        });
        RequestManager.getInstance(this).addToRequestQueue(stringRequest);
        return false;
    }

    @Override
    public boolean onStopJob(com.firebase.jobdispatcher.JobParameters job) {
        return false;
    }
}
4

1 回答 1

1

大概 :

SharedPreferences pref1 = getSharedPreferences(Preferences.LIST, 0);

导致问题,因为设置返回的是 byregisterOnSharedPreferenceChangeListener而不是 by 。SharedPreferencesgetDefaultSharedPreferencesgetSharedPreferences

笔记 :

getDefaultSharedPreferences()-使用默认的首选项文件名

getSharedPreferences-检索并保存首选项文件“名称”的内容

因此,要使其工作保存Preferences.CHAT_LIST使用getDefaultSharedPreferences或设置 registerOnSharedPreferenceChangeListener在 Activity 返回的实例上getSharedPreferences

于 2017-03-27T06:12:30.400 回答