Theres编辑文本字段。它必须像这样工作： 1）如果它是空的 - 没有任何事情发生 2）如果用户使用带有JSON对象的HTTP请求放置一些新文本启动TextWatcher的方法。 String的值也将放在共享首选项中 3）如果用户打开活动时，共享首选项已经具有前一个字符串的值，则必须只从该字符串设置文本，并且不要使用HTTP请求启动TextWatcher的方法。 所以有三个条件，只有在字符串的值与共享的pref中不相同的情况下，progrmm才能发出请求。现在它发送请求即使人只是打开应用程序。我想避免错误的请求，只在新的string值之后发出请求。
主要问题：如果文本字段中的值与sharedpref中的值不同，如何启动HTTP请求代码？
P.S。如果你认为我的问题很糟糕。请在说明中告诉我不要让-1请。教新程序员
这是代码
public class MainActivity extends AppCompatActivity {
AppCompatButton chooseLanguageButton;
AppCompatButton cleanButton;
AppCompatEditText translatedTextOutput;
AppCompatEditText translatedTextInput;
String translatedInputString;
RequestQueue requestQueue;
final String TAG = "myTag";
String language;
SharedPreferences mSettings;
SharedPreferences textReference;
SharedPreferences translateReference;
SharedPreferences longLangReference;
SharedPreferences shortLangReference;
final String SAVED_TEXT = "text";
final String SAVED_TRANSLATION = "translation";
final String LANGUAGE_LONG = "lang_long";
final String LANGUAGE_SHORT = "lang_short";
public static final String APP_PREFERENCES = "mysettings";
private ProgressBar progressBar;
private Timer timer;
private TextWatcher searchTextWatcher = new TextWatcher() {
@Override
public void afterTextChanged(Editable arg0) {
Log.v(TAG, "in afterTextChanged");
timer = new Timer();
timer.schedule(new TimerTask() {
@Override
public void run() {
if (translatedTextInput.getText().length() != 0){
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
MainActivity.this.runOnUiThread(new Runnable() {
@Override
public void run() {
requestQueue = Volley.newRequestQueue(MainActivity.this);
sendJsonRequest();
}
});
}
InputMethodManager in = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
in.hideSoftInputFromWindow(translatedTextInput.getApplicationWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
}
}, 600);
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
if (timer != null) {
timer.cancel();
}
saveText();
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
Log.v(TAG, "in Oncreate");
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
chooseLanguageButton = (AppCompatButton) findViewById(R.id.choose_language_button);
cleanButton = (AppCompatButton) findViewById(R.id.clean_button);
translatedTextOutput = (AppCompatEditText) findViewById(R.id.translated_text_field);
translatedTextInput = (AppCompatEditText) findViewById(R.id.translation_input_edit);
int textLength = translatedTextInput.getText().length();
translatedTextInput.setSelection(textLength);
translatedTextInput.addTextChangedListener(searchTextWatcher);
chooseLanguageButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Log.v(TAG, "in chooseLanguageListener");
Intent intent = new Intent(MainActivity.this, ChooseLanguageList.class);
startActivity(intent);
}
});
cleanButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
translatedTextInput.setText("");
translatedTextOutput.setText("");
}
});
mSettings = getSharedPreferences(APP_PREFERENCES, Context.MODE_PRIVATE);
if (mSettings.contains(LANGUAGE_LONG)){
Log.v(TAG, "here");
chooseLanguageButton.setText(mSettings.getString(LANGUAGE_LONG,""));
} else {
Log.v(TAG, "THERE");
chooseLanguageButton.setText("Choose language");
}
if (mSettings.contains(SAVED_TEXT)){
Log.v(TAG, "here");
translatedTextInput.setText(mSettings.getString(SAVED_TEXT,""));
} else {
Log.v(TAG, "boooooom");
}
if (mSettings.contains(SAVED_TRANSLATION)){
Log.v(TAG, "here in TRANSLATION FIELD" + mSettings.getString(SAVED_TRANSLATION,""));
translatedTextOutput.setText(mSettings.getString(SAVED_TRANSLATION,""));
} else {
Log.v(TAG, "boooooom");
}
}
@Override
protected void onResume() {
super.onResume();
translatedTextInput.post(new Runnable() {
@Override
public void run() {
Selection.setSelection(translatedTextInput, );
}
});
}
@Override
protected void onDestroy() {
super.onDestroy();
mSettings = null;
}
void saveText() {
// mSettings = getSharedPreferences(SAVED_TEXT, MODE_PRIVATE);
SharedPreferences.Editor ed = mSettings.edit();
ed.putString(SAVED_TEXT, translatedTextInput.getText().toString());
ed.putString(SAVED_TRANSLATION, translatedTextOutput.getText().toString());
ed.apply();
Log.v(TAG, "Text saved==========>" + translatedTextInput.getText().toString());
Toast.makeText(this, "Text saved", Toast.LENGTH_SHORT).show();
}
void loadText() {
textReference = getSharedPreferences(SAVED_TEXT, MODE_PRIVATE);
translatedTextInput.setText(mSettings.getString(SAVED_TEXT,""));
translateReference = getSharedPreferences(SAVED_TRANSLATION, MODE_PRIVATE);
translatedTextOutput.setText(mSettings.getString(SAVED_TRANSLATION,""));
Log.v(TAG, "IN LOAD TEXT METHOD" + mSettings.getString(SAVED_TEXT,""));
Log.v(TAG, "IN LOAD TRANSLATION METHOD" + mSettings.getString(SAVED_TRANSLATION,""));
}
public void sendJsonRequest() {
Log.v(TAG, "in sendJsonObject");
Intent myIntent = getIntent();
// language = myIntent.getStringExtra("short");
shortLangReference = getSharedPreferences(LANGUAGE_SHORT, MODE_PRIVATE);
language = mSettings.getString(LANGUAGE_SHORT,"");
Log.v(getClass().getSimpleName(), "language short = " + language);
translatedInputString = translatedTextInput.getText().toString().replace(" ","+");
String url = String.format(getApplicationContext().getResources().getString(R.string.request_template),
String.format(getApplicationContext().getResources().getString(R.string.query_Template), translatedInputString, language ));
JsonObjectRequest jsObjRequest = new JsonObjectRequest
(Request.Method.GET, url, null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
Log.v(TAG, "Inside OnResponse" + response.toString());
JSONArray results = null;
try {
results = response.getJSONObject("data").getJSONArray("translations");
for (int i=0,j=results.length();i<j;i++) {
String webTitle = results.getJSONObject(i).getString("translatedText");
translatedTextOutput.setText(webTitle);
}
} catch (JSONException e) {
Log.e(TAG, "Error :" + e);
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
if (error instanceof NetworkError) {
Log.e(TAG, "NetworkError");
} else if (error instanceof ServerError) {
Log.e(TAG, "The server could not be found. Please try again after some time!!");
} else if (error instanceof AuthFailureError) {
Log.e(TAG, "AuthFailureError");
} else if (error instanceof ParseError) {
Log.e(TAG, "Parsing error! Please try again after some time!!");
} else if (error instanceof NoConnectionError) {
Log.e(TAG, "NoConnectionError!");
} else if (error instanceof TimeoutError) {
Log.e(TAG, "Connection TimeOut! Please check your internet connection.");
}
}
});
requestQueue.add(jsObjRequest);
}
}