活动引用

我有一个异步任务,其中有一个警告,它应该是静态的,否则可能会发生泄漏。

所以我用了这样一个弱引用:

 private static class GetContacts extends AsyncTask<String, Void, Boolean> {
    ProgressDialog dialog;
    private WeakReference<Novinky> activityReference;

    GetContacts(Novinky context) {
        activityReference = new WeakReference<>(context);
    }

    @Override
    protected void onPreExecute() {
        // get a reference to the activity if it is still there
        Novinky activity = activityReference.get();
        if (activity == null || activity.isFinishing()) return;
        super.onPreExecute();
        dialog = new ProgressDialog(activity);
        dialog.setMessage("Načítavam");
        dialog.setTitle("Pripájam sa k serveru");
        dialog.show();
        dialog.setCancelable(false);
    }

    @Override
    protected Boolean doInBackground(String... args) {
        HttpHandler sh = new HttpHandler();
        String url = "https://www...";
        String jsonStr = sh.makeServiceCall(url);

        if (jsonStr != null) {
            try {JSONObject jsonObj = new JSONObject(jsonStr);
                JSONArray actors = jsonObj.getJSONArray("result");

                for (int i = 0; i < actors.length(); i++) {
                    JSONObject c = actors.getJSONObject(i);

                    Actors actor = new Actors();

                    actor.setLetter(c.getString("letter"));
                    actor.setNazov(c.getString("name"));
                    actor.setPerex(c.getString("perex"));

                    actorsList.add(actor);
                }

            }  catch (final JSONException e) {
                        Novinky.this.runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(Novinky.this.getApplicationContext(),
                                "Chyba dát: " + e.getMessage(),
                                Toast.LENGTH_LONG).show();
                    }
                }); }

            return true;

        } else {
                Novinky.this.runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    Toast.makeText(Novinky.this.getApplicationContext(),
                            "Chyba internetového pripojenia.",
                            Toast.LENGTH_LONG).show();
                }
            });
            return false;
        }
    }

    protected void onPostExecute(Boolean result) {
        // get a reference to the activity if it is still there
        Novinky activity = activityReference.get();
        if (activity == null || activity.isFinishing()) return;
        super.onPostExecute(result);
        dialog.dismiss();
        adapter.notifyDataSetChanged();
    }
}

1/ actorsList.add(actor); -在我的for循环中现在说 无法从静态上下文引用非静态字段“actorsList”

2/ Novinky.this.runOnUiThread - 无法从静态上下文引用

Novinky activity = activityReference.get(); activity.runOnUiThread 然后发出警告 此字段泄漏上下文对象

3/ adapter.notifyDataSetChanged(); . 错误显示: 无法从静态上下文引用非静态字段“适配器”

更新:我以某种方式解决了它,现在我没有错误,应用程序正在运行,但仍然不确定我是否正确解决了它:

对于定义的1/I static ArrayList<Actors> actorsList;

2/在捕获中,否则我定义 final Novinky activity = activityReference.get();

然后:

3/在我使用的onPostExecute中 activity.adapter.notifyDataSetChanged();