Android learning blog: SharedPreferences Switch ,saving the preferences,clear and remove the key value

AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.saketh.sharedprefdemo">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
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=".SecondActivitys"></activity>
</application>
</manifest>
activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/pageLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"




    tools:context="com.example.saketh.sharedprefdemo.MainActivity">


    <Switch
        android:id="@+id/pageColorSwitch"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="20dp"
        android:text="True Green" />


    <EditText
        android:id="@+id/etName"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="74dp"
        android:hint="Eneter your name" />


    <EditText
        android:id="@+id/etProfession"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Enter your professional" />


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">


        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="saveAccountData"
            android:text="save" />


        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="loadAccountData"
            android:text="load" />
    </LinearLayout>


    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="openSecondActivity"
        android:text="open second activity" />


    <TextView
        android:id="@+id/txvName"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="Person Name"
        android:textColor="#969494"
        android:textSize="25sp"
        android:textStyle="bold" />


    <TextView
        android:id="@+id/txvProfession"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="Profession"
        android:textColor="#969494"
        android:textSize="25sp"
        android:textStyle="bold" />




</LinearLayout>


MainActivity.java




package com.example.saketh.sharedprefdemo;


import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.Switch;
import android.widget.TextView;


public class MainActivity extends AppCompatActivity {
    private EditText etName,etProfession;
    private TextView txvName,txvProfession;
    private Switch pageColorSwitch;
    private LinearLayout pageLayout;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        etName=(EditText) findViewById(R.id.etName);
        etProfession=(EditText) findViewById(R.id.etProfession);
        txvName=(TextView) findViewById(R.id.txvName);
        txvProfession=(TextView) findViewById(R.id.txvProfession);
        pageColorSwitch=(Switch) findViewById(R.id.pageColorSwitch);
        pageLayout=(LinearLayout) findViewById(R.id.pageLayout);
        pageColorSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                setPageColor(isChecked);




            }
        });
        //retrive the value from Activity level Sharedprefs
        SharedPreferences sharedPreferences=getPreferences(Context.MODE_PRIVATE);
        boolean isChecked=sharedPreferences.getBoolean("green",false);//default value false
        pageColorSwitch.setChecked(isChecked);
    }


    private void setPageColor(boolean isChecked) {//save data in Activity level SharedPrefs
        SharedPreferences sharedPreferences=getPreferences(Context.MODE_PRIVATE);
        SharedPreferences.Editor editor=sharedPreferences.edit();
        editor.putBoolean("green",isChecked);
        editor.apply();
        pageLayout.setBackgroundColor(isChecked? Color.GREEN:Color.WHITE);
    }


    public void saveAccountData(View view) {//saving app level SharedPref file
        SharedPreferences sharedPreferences=getSharedPreferences(getPackageName()+Constants.PREF_FILE_NAME,Context.MODE_PRIVATE);
        SharedPreferences.Editor editor=sharedPreferences.edit();
        editor.putString(Constants.KEY_NAME,etName.getText().toString());
        editor.putString(Constants.KEY_PROFESSION,etProfession.getText().toString());
        editor.putInt(Constants.KEY_PROF_ID,287);
        editor.apply();//editor.commit
    }


    public void loadAccountData(View view) {//loading app level SharedPref file
        SharedPreferences sharedPreferences=getSharedPreferences(getPackageName()+Constants.PREF_FILE_NAME,Context.MODE_PRIVATE);
        String name=sharedPreferences.getString(Constants.KEY_NAME,"N/A");
        String profession=sharedPreferences.getString(Constants.KEY_PROFESSION,"N/A");
        int profId=sharedPreferences.getInt(Constants.KEY_PROF_ID,0);
        txvName.setText(name);
        String profstr=profession+"-"+profId;
        txvProfession.setText(profstr);
    }


    public void openSecondActivity(View view) {//accessing app level SharedPref file
        Intent in=new Intent(getApplicationContext(),SecondActivitys.class);
        startActivity(in);
    }
}





activity_second_activitys.xml



<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="20dp">


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">


        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_weight="1"
            android:onClick="loadAccountData"
            android:text="load" />


        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_weight="1"
            android:onClick="clearAccountData"
            android:text="clear" />


        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_weight="1"
            android:onClick="removeProfessionKey"
            android:text="remove" />
    </LinearLayout>


    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginTop="30dp"
        android:text="Person Name"
        android:textColor="#969494"
        android:textSize="24sp"
        android:textStyle="bold"
        android:id="@+id/txvName"/>


    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"


        android:text="Profession"
        android:textColor="#969494"
        android:textSize="20sp"
        android:textStyle="bold"
        android:id="@+id/txvProfession"/>


</LinearLayout>





SecondActivitys.java




package com.example.saketh.sharedprefdemo;


import android.content.Context;
import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;


public class SecondActivitys extends AppCompatActivity {
    TextView txvName,txvProfession;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second_activitys);
        txvName=(TextView) findViewById(R.id.txvName);
        txvProfession=(TextView) findViewById(R.id.txvProfession);
    }


    public void loadAccountData(View view) {//accessing app level SharedPref file
        SharedPreferences sharedPreferences=getSharedPreferences(getPackageName()+Constants.PREF_FILE_NAME, Context.MODE_PRIVATE);
        String name=sharedPreferences.getString(Constants.KEY_NAME,"N/A");
        String profession=sharedPreferences.getString(Constants.KEY_PROFESSION,"N/A");
        int profId=sharedPreferences.getInt(Constants.KEY_PROF_ID,0);
        txvName.setText(name);
        String profstr=profession+"-"+profId;
        txvProfession.setText(profstr);
    }


    public void clearAccountData(View view) {
        SharedPreferences sp=getSharedPreferences(getPackageName()+Constants.PREF_FILE_NAME,Context.MODE_PRIVATE);
        SharedPreferences.Editor editor=sp.edit();
        editor.clear();
        editor.apply();
    }


    public void removeProfessionKey(View view) {
        SharedPreferences sp=getSharedPreferences(getPackageName()+Constants.PREF_FILE_NAME,Context.MODE_PRIVATE);
        SharedPreferences.Editor editor=sp.edit();
        editor.remove(Constants.KEY_PROFESSION);
        editor.apply();
    }
}


Constants.java






package com.example.saketh.sharedprefdemo;


/**
 * Created by saketh on 3/6/2017.
 */


public class Constants {
    public static final String PREF_FILE_NAME=".my_pref_file";
    public static final String KEY_NAME="name";
    public static final String KEY_PROFESSION="profession";
    public static final String KEY_PROF_ID="prof_id";
}
Android learning blog

Monday, 6 March 2017

SharedPreferences Switch ,saving the preferences,clear and remove the key value

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