webview zoom

WebViewWrapperManager.java

// android/app/src/main/java/com/YOUR_APP/webview/WebViewWrapperManager.java
package com.YOUR_APP.webview;

import android.webkit.WebView;

import com.facebook.react.views.webview.ReactWebViewManager;
import com.facebook.react.uimanager.ThemedReactContext;

public class WebViewWrapperManager extends ReactWebViewManager {
    private static final String REACT_CLASS = "RCTWebViewWrapper";

    @Override
    public String getName() {
        return REACT_CLASS;
    }

    @Override
    protected WebView createViewInstance(ThemedReactContext reactContext) {
        WebView webView = super.createViewInstance(reactContext);
        // Set text zoom
        webView.getSettings().setTextZoom(100);
        return webView;
    }
}

WebViewWrapperPackage.java

// android/app/src/main/java/com/YOUR_APP/webview/WebViewWrapperPackage.java
package com.YOUR_APP.webview;

import com.facebook.react.ReactPackage;
import com.facebook.react.bridge.JavaScriptModule;
import com.facebook.react.bridge.NativeModule;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.uimanager.ViewManager;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class WebViewWrapperPackage implements ReactPackage {
    @Override
    public List<NativeModule> createNativeModules(ReactApplicationContext reactApplicationContext) {
        return new ArrayList<>();
    }

    @Override
    public List<ViewManager> createViewManagers(ReactApplicationContext reactApplicationContext) {
        return Arrays.<ViewManager>asList(
                new WebViewWrapperManager()
        );
    }
}