SharedPreferences দিয়ে এক্টিভিটির মাঝপথে ডেটা শেয়ার করা
`SharedPreferences` একটি লাইটওয়েট কি-ভ্যালু স্টোরেজ। এটি ব্যবহার করে একটি এক্টিভিটিতে ডেটা সংরক্ষণ করে অন্য এক্টিভিটিতে পাওয়া যায়।
ধাপ ১: নতুন প্রজেক্ট তৈরি
Android Studio-তে File → New Project যান।
ধাপ ২: লেআউট ফাইল (res/layout/activity_main.xml)
<?xml version = "1.0" encoding = "utf-8"?> <LinearLayout xmlns:android = "https://schemas.android.com/apk/res/android" xmlns:tools = "https://schemas.android.com/tools" android:layout_width = "match_parent" android:layout_height = "match_parent" android:layout_margin = "16dp" android:orientation = "vertical" tools:context = ".MainActivity"> <EditText android:id = "@+id/edit_text" android:layout_width = "match_parent" android:layout_height = "wrap_content" android:layout_gravity = "center" android:hint = "Enter something to pass" android:inputType = "text" /> <Button android:id = "@+id/button" android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:layout_gravity = "center" android:layout_marginTop = "16dp" android:text = "Next" /> </LinearLayout>
ধাপ ৩: MainActivity.java (src/MainActivity.java)
package com.example.myapplication; import android.content.Intent; import android.content.SharedPreferences; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.Button; import android.widget.EditText; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); final EditText editText = findViewById(R.id.edit_text); Button button = findViewById(R.id.button); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { String value = editText.getText().toString().trim(); SharedPreferences sharedPref = getSharedPreferences("myKey", MODE_PRIVATE); SharedPreferences.Editor editor = sharedPref.edit(); editor.putString("value", value); editor.apply(); Intent intent = new Intent(MainActivity.this, SecondActivity.class); startActivity(intent); } }); } }
ধাপ ৪: SecondActivity লেআউট (res/layout/activity_second.xml)
<?xml version = "1.0" encoding = "utf-8"?> <LinearLayout xmlns:android = "https://schemas.android.com/apk/res/android" xmlns:tools = "https://schemas.android.com/tools" android:layout_width = "match_parent" android:layout_height = "match_parent" android:layout_margin = "16dp" android:orientation = "vertical" tools:context = ".SecondActivity"> <TextView android:id = "@+id/text_view" android:layout_width = "match_parent" android:layout_height = "wrap_content" android:layout_gravity = "center" /> </LinearLayout>
ধাপ ৫: SecondActivity.java (src/SecondActivity.java)
package com.example.myapplication; import android.content.SharedPreferences; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.widget.TextView; public class SecondActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_second); TextView textView = findViewById(R.id.text_view); SharedPreferences sharedPreferences = getSharedPreferences("myKey", MODE_PRIVATE); String value = sharedPreferences.getString("value",""); textView.setText(value); } }
ধাপ ৬: AndroidManifest.xml
<?xml version = "1.0" encoding = "utf-8"?> <manifest xmlns:android = "https://schemas.android.com/apk/res/android" package = "com.example.myapplication"> <application android:allowBackup = "true" android:icon = "@mipmap/ic_launcher" android:label = "@string/app_name" android:roundIcon = "@mipmap/ic_launcher_round" android:supportsRtl = "true" android:theme = "@style/AppTheme"> <activity android:name = ".MainActivity"> <intent-filter> <action android:name = "android.intent.action.MAIN" /> <category android:name = "android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name = ".SecondActivity"></activity> </application> </manifest>
অ্যাপ্লিকেশন চালান
ডিভাইস সংযুক্ত থাকলে Run আইকনে ক্লিক করুন। প্রথম এক্টিভিটিতে টেক্সট লিখে Next করলে দ্বিতীয় এক্টিভিটিতে সেটি দেখাবে।
