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Toast.makeText(this, "This is a toast", Toast.LENGTH_SHORT).show();
Here you can increase the timeout by using Toast.LENGTH_LONG instead of Toast.LENGHT_SHORT.

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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/custom_toast_container"
    android:orientation="horizontal"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:padding="8dp"
    android:background="#DAAA"
    >
    <ImageView android:src="@drawable/ic_launcher_foreground"
        android:layout_width="44dp"

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LayoutInflater inflater = getLayoutInflater();
View layout = inflater.inflate(R.layout.custom_toast,
        (ViewGroup) findViewById(R.id.custom_toast_container));

TextView text = (TextView) layout.findViewById(R.id.text);
text.setText("This is a custom toast");

Toast toast = new Toast(getApplicationContext());
toast.setGravity(Gravity.CENTER_VERTICAL, 0, 0);
toast.setDuration(Toast.LENGTH_LONG);

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import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

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<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>

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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"
    android:orientation="vertical"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <LinearLayout

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package com.techpakka.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.TextView;

public class MainActivity extends AppCompatActivity {

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   @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btn_save = findViewById(R.id.btn_save);
        btn_load = findViewById(R.id.btn_load);
        btn_second = findViewById(R.id.btn_second);
        ed_name = findViewById(R.id.ed1);
        ed_email = findViewById(R.id.ed2);

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btn_load.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                SharedPreferences sharedPreferences = getPreferences(Context.MODE_PRIVATE);
                String name = sharedPreferences.getString("name","default_value");
                String email = sharedPreferences.getString("email","default_value");
                txt_name.setText(name);
                txt_email.setText(email);
            }
        });

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  btn_save.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //getdata from edittext and store in corresponding string file
                str_email = ed_email.getText().toString();
                str_name = ed_name.getText().toString();
                SharedPreferences sharedPreferences = getSharedPreferences("my_sharedpreference_file_name",Context.MODE_PRIVATE);
                //we need editor to edit created shared preference file
                SharedPreferences.Editor editor = sharedPreferences.edit();
                editor.putString("name",str_name);