Android Native Module wrapper for ReactNative -MyLibraryModule.java

MyLibraryModule.java

package com.reactlibrary;

import android.graphics.Color;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;

import com.facebook.react.bridge.Callback;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.ReactContextBaseJavaModule;
import com.facebook.react.bridge.ReactMethod;
import com.facebook.react.bridge.ReadableMap;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;

public class MyLibraryModule extends ReactContextBaseJavaModule {

    private final ReactApplicationContext reactContext;

    private static final String DURATION_TOAST_SHORT = "TOAST_SHORT";
    private static final String DURATION_TOAST_LONG = "TOAST_LONG";

    public MyLibraryModule(ReactApplicationContext reactContext) {
        super(reactContext);
        this.reactContext = reactContext;
    }

    // Methods

    /**
     * Show Toast ReactNative method
     * @param options Toast options
     */
    @ReactMethod
    public void showToast(ReadableMap options) {
        String message = getOptionValue(options, "message", "");
        int duration = getOptionValue(options, "duration", Toast.LENGTH_SHORT);

        Toast.makeText(reactContext, message, duration).show();
    }

    // Module name in javascript to expose
    @NonNull
    @Override
    public String getName() {
        return "MyLibrary";
    }

    // Constants in javascript to expose
    @Nullable
    @Override
    public Map<String, Object> getConstants() {
        final Map<String, Object> constants = new HashMap<>();
        constants.put(DURATION_TOAST_SHORT, Toast.LENGTH_SHORT);
        constants.put(DURATION_TOAST_LONG, Toast.LENGTH_LONG);
        return constants;
    }

    // Helpers
    private String getOptionValue(ReadableMap option, String key, String fallBack) {
        return option.hasKey(key) ? option.getString(key) : fallBack;
    }
    private int getOptionValue(ReadableMap option, String key, int fallBack) {
        return option.hasKey(key) ? option.getInt(key) : fallBack;
    }
    private boolean getOptionValue(ReadableMap option, String key, boolean fallBack) {
        return option.hasKey(key) ? option.getBoolean(key) : fallBack;
    }
}