APP开发一般分原生开发和H5开发，接入方式有所不同。
1.H5开发的APP可以使用客服代码嵌入方式，也可以使用客服直连，和网页接入没有区别。
2.原生代码开发的APP通过webview组件嵌入客服直连的方式接入；如果需要支持语音发送，文件图片传输等功能，需要做一些处理，请参考以下示例；

                	
package com.xxx.activity;

import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.provider.MediaStore;
import android.text.TextUtils;
import android.view.KeyEvent;
import android.webkit.DownloadListener;
import android.webkit.JavascriptInterface;
import android.webkit.JsResult;
import android.webkit.PermissionRequest;
import android.webkit.ValueCallback;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;

import com.xxx.R;

import java.io.File;

public class MorningH5Activity extends AppCompatActivity {
    private ValueCallback mUploadMessage;
    private ValueCallback mUploadMessage5;
    public static final int FILECHOOSER_RESULTCODE = 5173;
    public static final int FILECHOOSER_RESULTCODE_FOR_ANDROID_5 = 5174;

    private WebView webView;

    @Override
    public void initView() {
        setContentView(R.layout.activity_worksheet_service);
        webView=(WebView) findViewById(R.id.web_view);
        WebSettings set = webView.getSettings();
        set.setJavaScriptEnabled(true);
        set.setUseWideViewPort(true);
        set.setLoadWithOverviewMode(true);
        set.setAllowFileAccess(true);
    }

    @Override
    public boolean onKeyDown(int keyCode ,KeyEvent keyEvent){
        if(keyCode==keyEvent.KEYCODE_BACK){//监听返回键，如果可以后退就后退
            if(webView.canGoBack()){
                webView.goBack();
                return true;
            }
        }
        return super.onKeyDown(keyCode, keyEvent);
    }

    @Override
    public void initData(Bundle arg0) {
        webView.setWebChromeClient(new MyChromeClient());

        webView.setDownloadListener(new DownloadListener() {
            @Override
            public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimeType, long contentLength) {
                Intent intent = new Intent(Intent.ACTION_VIEW);
                intent.addCategory(Intent.CATEGORY_BROWSABLE);
                intent.setData(Uri.parse(url));
                startActivity(intent);
            }
        });

        String url=getIntent().getStringExtra("url");
        if (!TextUtils.isEmpty(url)){
            webView.loadUrl(url);
        }
    }


    @Override
    protected void onDestroy() {
        super.onDestroy();
        webView.destroy();
    }

    @SuppressLint("NewApi")
    @Override
    protected void onActivityResult(int requestCode, int resultCode,
                                    Intent intent) {
        super.onActivityResult(requestCode, resultCode, intent);
        if (requestCode == FILECHOOSER_RESULTCODE) {
            if (null == mUploadMessage) {
                return;
            }
            Uri result = intent == null || resultCode != Activity.RESULT_OK ? null
                    : intent.getData();
            mUploadMessage.onReceiveValue(result);
            mUploadMessage = null;
        } else if (requestCode == FILECHOOSER_RESULTCODE_FOR_ANDROID_5) {
            if (null == mUploadMessage5) {
                return;
            }
            mUploadMessage5.onReceiveValue(WebChromeClient.FileChooserParams
                    .parseResult(resultCode, intent));
            mUploadMessage5 = null;
        }
    }


    public class MyChromeClient extends WebChromeClient {
        @Override
        public void onPermissionRequest(PermissionRequest request) {
            if (Build.VERSION.SDK_INT>=Build.VERSION_CODES.LOLLIPOP){
                request.grant(request.getResources());
                request.getOrigin();
            }
        }

        @Override
        public boolean onJsAlert(WebView view, String url, String message, JsResult result) {
           // return super.onJsAlert(view, url, message, result);
            result.confirm();
            return true;
        }

        @Override
        public void onReceivedTitle(WebView view, String title) {
            super.onReceivedTitle(view, title);
            if (title != null) {
                tv_title.setText(title);
            }
        }

        // For Android < 3.0
        public void openFileChooser(ValueCallback uploadMsg){
            this.openFileChooser(uploadMsg, "*/*");
        }

        // For Android >= 3.0
        public void openFileChooser(ValueCallback uploadMsg,
                                    String acceptType) {
            this.openFileChooser(uploadMsg, acceptType, null);
        }

        // For Android >= 4.1
        public void openFileChooser(ValueCallback uploadMsg,
                                    String acceptType, String capture) {
            mUploadMessage = uploadMsg;
            Intent i = new Intent(Intent.ACTION_GET_CONTENT);
            i.addCategory(Intent.CATEGORY_OPENABLE);
            i.setType("*/*");
            startActivityForResult(Intent.createChooser(i, "文件浏览"),
                    FILECHOOSER_RESULTCODE);
        }

        @TargetApi(Build.VERSION_CODES.LOLLIPOP)
        @Override
        public boolean onShowFileChooser(WebView mWebView,
                                         ValueCallback filePathCallback,
                                         WebChromeClient.FileChooserParams fileChooserParams) {
            if (mUploadMessage5 != null) {
                mUploadMessage5.onReceiveValue(null);
                mUploadMessage5 = null;
            }
            mUploadMessage5 = filePathCallback;
            Intent intent = fileChooserParams.createIntent();
            try {
                startActivityForResult(intent,
                        FILECHOOSER_RESULTCODE_FOR_ANDROID_5);
            } catch (ActivityNotFoundException e) {
                mUploadMessage5 = null;
                return false;
            }
            return true;
        }
    }


}