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SharedPreferences Tutorial
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<?xml version="1.0" encoding="utf-8"?> | |
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" | |
xmlns:app="http://schemas.android.com/apk/res-auto" | |
xmlns:tools="http://schemas.android.com/tools" | |
android:layout_width="match_parent" | |
android:layout_height="match_parent" | |
android:orientation="vertical" | |
tools:context="com.example.application.exampleapp.MainActivity"> | |
<TextView | |
android:id="@+id/textview" | |
android:layout_width="match_parent" | |
android:layout_height="wrap_content" | |
android:gravity="center_horizontal" | |
android:textSize="30sp" | |
tools:text="Here will be our text" /> | |
<EditText | |
android:id="@+id/edittext" | |
android:layout_width="match_parent" | |
android:layout_height="wrap_content" /> | |
<Button | |
android:id="@+id/apply_text_button" | |
android:layout_width="wrap_content" | |
android:layout_height="wrap_content" | |
android:layout_gravity="center_horizontal" | |
android:text="apply text" /> | |
<Switch | |
android:id="@+id/switch1" | |
android:layout_width="wrap_content" | |
android:layout_height="wrap_content" | |
android:layout_gravity="center_horizontal" /> | |
<Button | |
android:id="@+id/save_button" | |
android:layout_width="wrap_content" | |
android:layout_height="wrap_content" | |
android:layout_gravity="center_horizontal" | |
android:text="save data" /> | |
</LinearLayout> |
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package com.example.application.exampleapp; | |
import android.content.SharedPreferences; | |
import android.support.v7.app.AppCompatActivity; | |
import android.os.Bundle; | |
import android.view.View; | |
import android.widget.Button; | |
import android.widget.EditText; | |
import android.widget.Switch; | |
import android.widget.TextView; | |
import android.widget.Toast; | |
public class MainActivity extends AppCompatActivity { | |
private TextView textView; | |
private EditText editText; | |
private Button applyTextButton; | |
private Button saveButton; | |
private Switch switch1; | |
public static final String SHARED_PREFS = "sharedPrefs"; | |
public static final String TEXT = "text"; | |
public static final String SWITCH1 = "switch1"; | |
private String text; | |
private boolean switchOnOff; | |
@Override | |
protected void onCreate(Bundle savedInstanceState) { | |
super.onCreate(savedInstanceState); | |
setContentView(R.layout.activity_main); | |
textView = (TextView) findViewById(R.id.textview); | |
editText = (EditText) findViewById(R.id.edittext); | |
applyTextButton = (Button) findViewById(R.id.apply_text_button); | |
saveButton = (Button) findViewById(R.id.save_button); | |
switch1 = (Switch) findViewById(R.id.switch1); | |
applyTextButton.setOnClickListener(new View.OnClickListener() { | |
@Override | |
public void onClick(View view) { | |
textView.setText(editText.getText().toString()); | |
} | |
}); | |
saveButton.setOnClickListener(new View.OnClickListener() { | |
@Override | |
public void onClick(View view) { | |
saveData(); | |
} | |
}); | |
loadData(); | |
updateViews(); | |
} | |
public void saveData() { | |
SharedPreferences sharedPreferences = getSharedPreferences(SHARED_PREFS, MODE_PRIVATE); | |
SharedPreferences.Editor editor = sharedPreferences.edit(); | |
editor.putString(TEXT, textView.getText().toString()); | |
editor.putBoolean(SWITCH1, switch1.isChecked()); | |
editor.apply(); | |
Toast.makeText(this, "Data saved", Toast.LENGTH_SHORT).show(); | |
} | |
public void loadData() { | |
SharedPreferences sharedPreferences = getSharedPreferences(SHARED_PREFS, MODE_PRIVATE); | |
text = sharedPreferences.getString(TEXT, ""); | |
switchOnOff = sharedPreferences.getBoolean(SWITCH1, false); | |
} | |
public void updateViews() { | |
textView.setText(text); | |
switch1.setChecked(switchOnOff); | |
} | |
} |
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