Question

您好我正在处理翻译应用程序。这个应用程序从webview获取string.getText（）。toString（）;我想用yandex api翻译这个选定的单词。我创建了AsyncTask类来从api中获取翻译后的单词。

public class Translate extends AsyncTask<String, String, JSONObject> {
TranslatedWord trWord = new TranslatedWord();
private static final String TAG_RESULTS = "text";

@Override
protected JSONObject doInBackground(String... args) {
    JSONParser jParser = new JSONParser();

    // Getting JSON from URL
    JSONObject json = jParser.getJSONFromUrl(args[0]);
    return json;
}

@Override
protected void onPostExecute(JSONObject json) {
    try {
        JSONArray result = json.getJSONArray(TAG_RESULTS);
        String text = result.getString(0);
        trWord.setTrWord(text);
    } catch (JSONException e) {
        e.printStackTrace();
    }
}

}

我应该在同一个表上插入所选单词并将其翻译成数据库。我在下面的代码中这样做。

private static String TRANSLATE_URL = "https://translate.yandex.net/api/v1.5/tr.json/translate?" +
        "key=trnsl.1.1.20171218T092308Z.2e90b7fad1cf523b.a2696fb34d9d70f427cad15c9ee664230c048054" +
        "&lang=tr&text=" + selectedWord;

    final ClipboardManager clipboard = (ClipboardManager) this.getSystemService(Context.CLIPBOARD_SERVICE);
    clipboard.addPrimaryClipChangedListener(new ClipboardManager.OnPrimaryClipChangedListener() {
        @Override
        public void onPrimaryClipChanged() {
            selectedWord = clipboard.getText().toString();

            translate.execute(TRANSLATE_URL);

            translatedWord = trword.getTrWord();

            Toast.makeText(getApplicationContext(), "Copy:\n" + selectedWord, Toast.LENGTH_SHORT).show();

            WordsDbHelper helper = new WordsDbHelper(getApplicationContext());
            SQLiteDatabase db = helper.getReadableDatabase();
            Cursor cursor = db.rawQuery("SELECT engWord FROM words; ", null);
            boolean titlePresent = false;

            while (cursor.moveToNext()) {
                String recorded_title = cursor.getString(cursor.getColumnIndex("engWord"));
                if (recorded_title.equals(selectedWord)) {
                    titlePresent = true;
                    Toast.makeText(getApplicationContext(), "There is already same word!",
                            Toast.LENGTH_LONG).show();
                }
            }

            if (!titlePresent)
            helper.createWord(new Words(selectedWord, translatedWord));
        }
    });

我在翻译单词方面遇到了一些问题。我正在接受这个错误。我需要一些帮助。请帮帮我。

java.lang.NullPointerException：尝试调用虚方法＆＃39; android.os.AsyncTask com.ermanelm.redler20.Translate.execute（java.lang.Object []）＆＃39;在空对象引用上

Answer 1

似乎翻译对象为空，请尝试替换，

translate.execute(TRANSLATE_URL);

与

new Translate().execute(TRANSLATE_URL);

Android AsyncTask nullpointer异常

1 个答案: