android-共享的首选项,它们在哪里？

概述我知道共享首选项的工作方式,但是我只是不知道在下面的代码中将代码插入哪里以保存用户数据.我有一个登录,后台任务来完成所有工作和注册.我希望该应用程序能够大放异彩用户登录时的页面.无法从其他答案中找出答案Login.javaButtonbttnLogin;EditTextloginEmail,loginPasswo

我知道共享首选项的工作方式,但是我只是不知道在下面的代码中将代码插入哪里以保存用户数据.我有一个登录,后台任务来完成所有工作和注册.我希望该应用程序能够大放异彩用户登录时的页面.无法从其他答案中找出答案

Login.java

button bttnLogin;EditText loginEmail, loginPassword;TextVIEw reglink;AlertDialog.Builder alert;@OverrIDeprotected voID onCreate(Bundle savedInstanceState){    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.activity_login);    loginEmail = (EditText) findVIEwByID(R.ID.email);    loginPassword = (EditText) findVIEwByID(R.ID.password);    reglink = (TextVIEw) findVIEwByID(R.ID.reglink);    reglink.setonClickListener(new VIEw.OnClickListener()    {        @OverrIDe        public voID onClick(VIEw v)        {            startActivity(new Intent(Login.this, Register.class));        }    });    bttnLogin = (button) findVIEwByID(R.ID.bttnLogin);    bttnLogin.setonClickListener(new VIEw.OnClickListener()    {        @OverrIDe        public voID onClick(VIEw v)        {            if (loginEmail.getText().toString().equals("") || loginPassword.getText().toString().equals(""))            {                alert = new AlertDialog.Builder(Login.this);                alert.set@R_301_5979@("Login Failed");                alert.setMessage("Try again");                alert.setPositivebutton("OK", new DialogInterface.OnClickListener()                {                    @OverrIDe                    public voID onClick(DialogInterface dialog, int which)                    {                        dialog.dismiss();                    }                });                AlertDialog alertDialog = alert.create();                alertDialog.show();            } else  //if user provIDes proper data            {                BackgroundTask backgroundTask = new BackgroundTask(Login.this);                backgroundTask.execute("login", loginEmail.getText().toString(), loginPassword.getText().toString());            }        }    });

Register.java

        private button regbutton;        public EditText regname;        public EditText regEmail;        public EditText regPassword;        public EditText conPassword;        private AlertDialog.Builder alert;@OverrIDeprotected voID onCreate(Bundle savedInstanceState){    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.activity_register);    regname = (EditText) findVIEwByID(R.ID.name);    regEmail = (EditText) findVIEwByID(R.ID.email);    regPassword = (EditText) findVIEwByID(R.ID.password);    conPassword = (EditText) findVIEwByID(R.ID.conPassword);    regbutton = (button) findVIEwByID(R.ID.regbutton);    regbutton.setonClickListener(this);}@OverrIDepublic voID onClick(VIEw v){    if (regname.getText().toString().equals("") || regEmail.getText().toString().equals("") ||  regPassword.getText().toString().equals("") || conPassword.getText().toString().equals(""))    {        alert = new AlertDialog.Builder(Register.this);        alert.set@R_301_5979@("Something not quite right");        alert.setMessage("Please fill in all the fIElds");        alert.setPositivebutton("OK", new DialogInterface.OnClickListener()        {            @OverrIDe            public voID onClick(DialogInterface dialog, int which)            {                dialog.dismiss();            }        });        AlertDialog alertDialog = alert.create();        alertDialog.show();    } else if (!(regPassword.getText().toString().equals(conPassword.getText().toString())))    {        alert = new AlertDialog.Builder(Register.this);        alert.set@R_301_5979@("Passwords do not match");        alert.setMessage("Try Again");        alert.setPositivebutton("OK", new DialogInterface.OnClickListener()        {            @OverrIDe            public voID onClick(DialogInterface dialog, int which)            {                dialog.dismiss();                conPassword.setText("");                regPassword.setText("");            }        });        AlertDialog alertDialog = alert.create();        alertDialog.show();    }    else //if user provIDes proper data    {        BackgroundTask backgroundTask = new BackgroundTask(Register.this);        backgroundTask.execute("register", regname.getText().toString(), regEmail.getText().toString()                , regPassword.getText().toString(), conPassword.getText().toString());    }

BackgroundTask.java

 public class BackgroundTask extends AsyncTask<String,VoID,String>{private Context context;private Activity activity;private String reg_url = "http://blaah.com/register.PHP";private String login_url = "http://blaah.com/login.PHP";private AlertDialog.Builder builder;private ProgressDialog progressDialog;public BackgroundTask(Context context){    this.context = context;    activity = (Activity) context;}@OverrIDeprotected voID onPreExecute(){    builder = new AlertDialog.Builder(activity);    progressDialog = new ProgressDialog(context);    progressDialog.set@R_301_5979@("Please wait");    progressDialog.setMessage("Connecting to Server...");    progressDialog.setIndeterminate(true);    progressDialog.setCancelable(false);    progressDialog.show();}@OverrIDeprotected String doInBackground(String... params){    String method = params[0];    if (method.equals("register"))    {        try        {            URL url = new URL(reg_url);            httpURLConnection httpURLConnection = (httpURLConnection) url.openConnection();            httpURLConnection.setRequestMethod("POST");            httpURLConnection.setDoOutput(true);            httpURLConnection.setDoinput(true);            OutputStream outputStream = httpURLConnection.getoutputStream();            BuffereDWriter buffereDWriter = new BuffereDWriter(new OutputStreamWriter(outputStream, "UTF-8"));            String name = params[1];            String email = params[2];            String username = params[3];            String password = params[4];            String data = URLEncoder.encode("name", "UTF-8") + "=" + URLEncoder.encode(name, "UTF-8") + "&" +                    URLEncoder.encode("email", "UTF-8") + "=" + URLEncoder.encode(email, "UTF-8") + "&" +                    URLEncoder.encode("password", "UTF-8") + "=" + URLEncoder.encode(password, "UTF-8");            buffereDWriter.write(data);            buffereDWriter.flush();            buffereDWriter.close();            outputStream.close();            inputStream inputStream = httpURLConnection.getinputStream();            BufferedReader bufferedReader = new BufferedReader(new inputStreamReader(inputStream));            StringBuilder stringBuilder = new StringBuilder();            String line = "";            while ((line = bufferedReader.readline()) != null)            {                stringBuilder.append(line).append("\n");            }            httpURLConnection.disconnect();            Thread.sleep(8000);            return stringBuilder.toString().trim();        } catch (MalformedURLException e)        {            e.printstacktrace();        } catch (IOException e)        {            e.printstacktrace();        } catch (InterruptedException e)        {            e.printstacktrace();        }    }    else if (method.equals("login"))    {        try        {            URL url = new URL(login_url);            httpURLConnection httpURLConnection = (httpURLConnection) url.openConnection();            httpURLConnection.setRequestMethod("POST");            httpURLConnection.setDoOutput(true);            httpURLConnection.setDoinput(true);            OutputStream outputStream = httpURLConnection.getoutputStream();            BuffereDWriter buffereDWriter = new BuffereDWriter(new OutputStreamWriter(outputStream, "UTF-8"));            String username,password;            username = params[1];            password = params [2];            String data = URLEncoder.encode("email", "UTF-8") + "=" + URLEncoder.encode(username, "UTF-8") + "&" +                    URLEncoder.encode("password", "UTF-8") + "=" + URLEncoder.encode(password, "UTF-8");            buffereDWriter.write(data);            buffereDWriter.flush();            buffereDWriter.close();            outputStream.close();            inputStream inputStream = httpURLConnection.getinputStream();            BufferedReader bufferedReader = new BufferedReader(new inputStreamReader(inputStream));            StringBuilder stringBuilder = new StringBuilder();            String line = "";            while ((line = bufferedReader.readline()) != null)            {                stringBuilder.append(line + "\n");            }            httpURLConnection.disconnect();            Thread.sleep(5000);            return stringBuilder.toString().trim();        } catch (MalformedURLException e)        {            e.printstacktrace();        } catch (ProtocolException e)        {            e.printstacktrace();        } catch (UnsupportedEnCodingException e)        {            e.printstacktrace();        } catch (IOException e)        {            e.printstacktrace();        } catch (InterruptedException e)        {            e.printstacktrace();        }    }    return null;}@OverrIDeprotected voID onProgressUpdate(VoID... values){    super.onProgressUpdate(values);}@OverrIDeprotected voID onPostExecute(String Json){   try   {       progressDialog.dismiss();       Log.v("JsON", Json);       JsONObject JsonObject = new JsONObject(Json);       JsONArray JsonArray = JsonObject.getJsONArray("server_response");       JsONObject Jsonobject = JsonArray.getJsONObject(0);       String code = Jsonobject.getString("code");       String message = Jsonobject.getString("message");       if(code.equals("reg_true"))       {           showDialog("Sucessful registration.Thank you.Enjoy_AS!", message, code);       }       else if (code.equals("reg_false"))       {           showDialog("User Already exists", message, code);       }       else if (code.equals("login_true"))       {           Toast.makeText(context, "You are logged in", Toast.LENGTH_LONG).show();           Intent intent = new Intent(activity, SplashScreen.class);           activity.startActivity(intent);       } else if (code.equals("login_false"))       {           showDialog("Login Error", message, code);       }   } catch (JsONException e){       e.printstacktrace();   }}public voID  showDialog(String @R_301_5979@,String message,String code){    builder.set@R_301_5979@(@R_301_5979@);    if (code.equals("reg_true") || code.equals("reg_false"))    {        builder.setMessage(message);//message form server        builder.setPositivebutton("OK", new DialogInterface.OnClickListener()        {            @OverrIDe            public voID onClick(DialogInterface dialog, int which)            {                dialog.dismiss();                activity.finish();            }        });    }    else if (code.equals("login_false"))    {        builder.setMessage(message);        builder.setPositivebutton("OK", new DialogInterface.OnClickListener()        {            @OverrIDe            public voID onClick(DialogInterface dialog, int which)            {                EditText loginEmail, loginPassword;                loginEmail = (EditText) activity.findVIEwByID(R.ID.email);                loginPassword = (EditText) activity.findVIEwByID(R.ID.password);                loginEmail.setText("");                loginPassword.setText("");                dialog.dismiss();            }        });    }    AlertDialog alertDialog = builder.create();    alertDialog.show();}}

我想打开应用程序的启动画面

 final String TAG = this.getClass().getname();private static int SPLASH_TIME_OUT = 4000;private TextVIEw saying;@OverrIDeprotected voID onCreate(Bundle savedInstanceState){    super.onCreate(savedInstanceState);    //this.requestwindowFeature(Window.FEATURE_NO_@R_301_5979@);    supportRequestwindowFeature(Window.FEATURE_NO_@R_301_5979@);    getwindow().setFlags(WindowManager.LayoutParams.FLAG_FulLSCREEN,                         WindowManager.LayoutParams.FLAG_FulLSCREEN);    setContentVIEw(R.layout.activity_splash_screen);    saying = (TextVIEw) findVIEwByID(R.ID.saying);    Typeface mainhead =  Typeface.createFromAsset(getAssets(), "Fonts/emporo.TTF");    saying.setTypeface(mainhead);    //Set text custom Font for subhead text    new Handler().postDelayed(new Runnable()    {        @OverrIDe        public voID run()        {            // This method will be executed once the timer is over            // Start your app main activity            Intent i = new Intent(SplashScreen.this, HomeScreen.class);            startActivity(i);            // close this activity            finish();        }    }, SPLASH_TIME_OUT);}}

解决方法:

这就是我在每个AndroID应用中使用的SharedPreferences

import androID.content.Context;import androID.content.SharedPreferences;/** * Created by Jimit Patel on 30/07/15. */public class Prefs {    private static final String TAG = Prefs.class.getSimplename();    private static final String MY_APP_PREFS = "my_app";    /**     * <p>ProvIDes Shared Preference object</p>     * @param context     * @return     */    private static SharedPreferences getPrefs(Context context) {        return context.getSharedPreferences(MY_APP_PREFS, Context.MODE_PRIVATE);    }    /**     * <p>Saves a string value for a given key in Shared Preference</p>     * @param context     * @param key     * @param value     */    public static voID setString(Context context, String key, String value) {        getPrefs(context).edit().putString(key, value).apply();    }    /**     * <p>Saves integer value for a given key in Shared Preference</p>     * @param context     * @param key     * @param value     */    public static voID setInt(Context context, String key, int value) {        getPrefs(context).edit().putInt(key, value).apply();    }    /**     * <p>Saves float value for a given key in Shared Preference</p>     * @param context     * @param key     * @param value     */    public static voID setfloat(Context context, String key, float value) {        getPrefs(context).edit().putfloat(key, value).apply();    }    /**     * <p>Saves long value for a given key in Shared Preference</p>     * @param context     * @param key     * @param value     */    public static voID setLong(Context context, String key, long value) {        getPrefs(context).edit().putLong(key, value).apply();    }    /**     * <p>Saves boolean value for a given key in Shared Preference</p>     * @param context     * @param key     * @param value     */    public static voID setBoolean(Context context, String key, boolean value) {        getPrefs(context).edit().putBoolean(key, value).apply();    }    /**     * ProvIDes string from the Shared Preferences     * @param context     * @param key     * @param defaultValue     * @return     */    public static String getString(Context context, String key, String defaultValue) {        return getPrefs(context).getString(key, defaultValue);    }    /**     * ProvIDes int from Shared Preferences     * @param context     * @param key     * @param defaultValue     * @return     */    public static int getInt(Context context, String key, int defaultValue) {        return getPrefs(context).getInt(key, defaultValue);    }    /**     * ProvIDes boolean from Shared Preferences     * @param context     * @param key     * @param defaultValue     * @return     */    public static boolean getBoolean(Context context, String key, boolean defaultValue) {        return getPrefs(context).getBoolean(key, defaultValue);    }    /**     * ProvIDes float value from Shared Preferences     * @param context     * @param key     * @param defaultValue     * @return     */    public static float getfloat(Context context, String key, float defaultValue) {        return getPrefs(context).getfloat(key, defaultValue);    }    /**     * ProvIDes long value from Shared Preferences     * @param context     * @param key     * @param defaultValue     * @return     */    public static long getLong(Context context, String key, long defaultValue) {        return getPrefs(context).getLong(key, defaultValue);    }    public static voID clearPrefs(Context context) {        getPrefs(context).edit().clear().commit();    }}

要使用它,您可以只使用它的那些功能

总结

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