$ npm install react-native-wechat --save

- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url
  sourceApplication:(NSString *)sourceApplication annotation:(id)annotation
{
  return [RCTLinkingManager application:application openURL:url
                            sourceApplication:sourceApplication annotation:annotation];
}

include ':RCTWeChat'
project(':RCTWeChat').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-wechat/android')

...
dependencies {
   ...
   compile project(':RCTWeChat')    // Add this line only.
}

import com.theweflex.react.WeChatPackage;       // Add this line before public class MainActivity

...

/**
 * A list of packages used by the app. If the app uses additional views
 * or modules besides the default ones, add more packages here.
 */
@Override
protected List<ReactPackage> getPackages() {
    return Arrays.<ReactPackage>asList(
        new MainReactPackage()
        , new WeChatPackage()        // Add this line
    );
}

package your.package.wxapi;

import android.app.Activity;
import android.os.Bundle;

import com.theweflex.react.WeChatModule;

public class WXEntryActivity extends Activity{
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        WeChatModule.handleIntent(getIntent());
        finish();
    }
}

<manifest>
  ...
  <application>
    ...
    <!-- 微信Activity -->
    <activity
      android:name=".wxapi.WXEntryActivity"
      android:label="@string/app_name"
      android:exported="true"
      />
  </application>
</manifest>

-keep class com.tencent.mm.sdk.** {
   *;
}

import * as WeChat from 'react-native-wechat';
import fs from 'react-native-fs';
var resolveAssetSource = require('resolveAssetSource'); // along with Image component
// Code example to share text message:
try {
    var result = await  WeChat.shareToTimeline({type: 'text', description: 'I\'m Wechat, :)'});
    console.log('share text message to time line successful', result);
}
catch (e) {
    console.log('share text message to time line failed', e);
}

// Code example to share image url:
// Share raw http(s) image from web will always fail with unknown reason, please use image file or image resource instead
try {
    var result = await WeChat.shareToTimeline({
        type: 'imageUrl',
        title: 'web image',
        description: 'share web image to time line',
        mediaTagName: 'email signature',
        messageAction: undefined,
        messageExt: undefined,
        imageUrl: 'http://www.ncloud.hk/email-signature-262x100.png'
    });
    console.log('share image url to time line successful', result);
}
catch (e) {
    console.log('share image url to time line failed', e);
}

// Code example to share image file:
try {
    var rootPath = fs.DocumentDirectoryPath;
    var savePath = rootPath + '/email-signature-262x100.png';
    console.log({savePath});
    /*
     * savePath on iOS may be:
     *  /var/mobile/Containers/Data/Application/B1308E13-35F1-41AB-A20D-3117BE8EE8FE/Documents/email-signature-262x100.png
     *
     * savePath on Android may be:
     *  /data/data/com.wechatsample/files/email-signature-262x100.png
     * */

    await fs.downloadFile('http://www.ncloud.hk/email-signature-262x100.png', savePath);

    var result = await WeChat.shareToTimeline({
        type: 'imageFile',
        title: 'image file download from network',
        description: 'share image file to time line',
        mediaTagName: 'email signature',
        messageAction: undefined,
        messageExt: undefined,
        imageUrl: "file://" + savePath // require the prefix on both iOS and Android platform
    });

    console.log('share image file to time line successful', result);
}
catch (e) {
    console.log('share image file to time line failed', e);
}

// Code example to share image resource:
try {
    var imageResource = require('./email-signature-262x100.png');
    var result = await WeChat.shareToTimeline({
        type: 'imageResource',
        title: 'resource image',
        description: 'share resource image to time line',
        mediaTagName: 'email signature',
        messageAction: undefined,
        messageExt: undefined,
        imageUrl: resolveAssetSource(imageResource).uri
    });
    console.log('share resource image to time line successful', result);
}
catch (e) {
    console.log('share resource image to time line failed', e);
}

// Code example to download an word file from web, then share it to WeChat session
// only support to share to session but time line
try {
    var rootPath = fs.DocumentDirectoryPath;
    var fileName = 'signature_method.doc';
    var savePath = rootPath + '/' + fileName;
    console.log({savePath});
    /*
     * savePath on iOS may be:
     *  /var/mobile/Containers/Data/Application/B1308E13-35F1-41AB-A20D-3117BE8EE8FE/Documents/signature_method.doc
     *
     * savePath on Android may be:
     *  /data/data/com.wechatsample/files/signature_method.doc
     * */

    await fs.downloadFile('https://open.weixin.qq.com/zh_CN/htmledition/res/assets/signature_method.doc', savePath);

    var result = await WeChat.shareToSession({
        type: 'file',
        title: fileName, // WeChat app treat title as file name
        description: 'share word file to chat session',
        mediaTagName: 'word file',
        messageAction: undefined,
        messageExt: undefined,
        filePath: savePath,
        fileExtension: '.doc'
    });

    console.log('share word file to chat session successful', result);
}
catch (e) {
    console.log('share word file to chat session failed', e);
}