How to create Hashmap from Json in Android

In this android programming source code example, we are going to create Hashmap from Json in Android.

You can copy and adopt this source code example to your android project without reinventing the wheel.

Below is a step by step source code to create Hashmap from Json in Android.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    android:orientation="vertical" 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"
    tools:context=".json.Json12">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="16sp"
        android:text="Hashmap from JSON"
        android:layout_gravity="center_horizontal"
        android:paddingBottom="8dp"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/text"
        android:textSize="14sp"
        android:padding="8dp"
        android:textColor="@color/colorAccent"/>

    <Button
        android:layout_gravity="center_horizontal"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/button"
        android:text="Json 2 Hashmap"
        />

</LinearLayout>

MainActivity.java

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import com.inducesmile.inducesmile_button.R;

import java.util.HashMap;

public class Json12 extends AppCompatActivity {

    static String jsonString = "{\"firstName\":\"Peter\",\"Country\":\"Nigeria\",\"State\":\"Lagos State\"}";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_json12);

        final Button button = findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //json2HashMap();
                button.setVisibility(View.GONE);
                jsonHashmap();
            }
        });
    }

    public void jsonHashmap() {
        HashMap<String, String> map = new Gson().fromJson(jsonString, new TypeToken<HashMap<String, String>>(){}.getType());
        TextView textView = findViewById(R.id.text);
        textView.setText(map.toString());
    }
}

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