Android 和 H5 通信

有需要与h5通信的需求，写了一个helper类，处理与h5通信。

import android.content.Context;
import android.os.Handler;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.View;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
/**
 * Created by Awen on 2016/12/14.
 */
public class WebViewHelper {
    private final String CALLJS = "javascript:%s(%s)";
    private WebView myBrowser;
    private MyJavaScriptInterface myJavaScriptInterface;
    private Handler mHandler;

    public WebViewHelper(WebView myBrowser, MyJavaScriptInterface myJavaScriptInterface, Handler handler) {
        this.myBrowser = myBrowser;
        this.myJavaScriptInterface = myJavaScriptInterface;
        this.mHandler = handler;
    }

    public void initWebView(String url) {
        WebSettings webSettings = myBrowser.getSettings();
        myBrowser.addJavascriptInterface(myJavaScriptInterface, "JavaScriptInterface");
        webSettings.setJavaScriptEnabled(true);
        webSettings.setAllowFileAccess(true);// 设置允许访问文件数据
        webSettings.setSupportZoom(false);
        webSettings.setBuiltInZoomControls(true);
        webSettings.setJavaScriptCanOpenWindowsAutomatically(true);
        webSettings.setCacheMode(WebSettings.LOAD_NO_CACHE);
        webSettings.setDomStorageEnabled(true);

        //myBrowser.loadUrl(Config.getServerAddress().replace("/server", url));
        myBrowser.loadUrl("http://192.168.1.14/h5" + url);
        myBrowser.setWebViewClient(new WebViewClient() {
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                view.loadUrl(url);
                return true;
            }
        });
        myBrowser.setOnKeyListener(new View.OnKeyListener() {
            @Override
            public boolean onKey(View v, int keyCode, KeyEvent event) {
                if (keyCode == KeyEvent.KEYCODE_BACK
                        && event.getAction() == MotionEvent.ACTION_UP
                        && myBrowser.canGoBack()) {
                    mHandler.sendEmptyMessage(0);
                    return true;
                }

                return false;
            }

        });
        myBrowser.setWebChromeClient(new WebChromeClient());
    }

    public static  abstract class MyJavaScriptInterface {
        protected Context mContext;

        public MyJavaScriptInterface() {
            mContext = WtpApplication.getInstance();
        }

        public abstract void requestShopId();
    }

    public void callJs(String method, Object... param) {
        String format = String.format(CALLJS, method, getParam(param));
        myBrowser.loadUrl(format);
    }

    public void callJsIntegerParam(String method, Object param) {
        String tmp = (String) param;
        while (tmp.length() > 1 && tmp.indexOf("0") == 0) {
            tmp = tmp.replaceFirst("0", "");
        }
        callJs(method, tmp);
    }

    private String getParam(Object... param) {
        if (param == null || param.length < 1)
            return "";
        StringBuilder sb = new StringBuilder("");
        for (Object str : param) {
            sb.append("'").append(str).append("',");
        }
        return sb.deleteCharAt(sb.length()-1).toString();
    }

    /**
     * 返回上几步
     * @param step  步数，为负数
     */
    public void backStep(int step) {
        if (myBrowser.canGoBackOrForward(step))
            myBrowser.goBackOrForward(step);
    }
}

调用类

public class TencentZoneFragment extends BaseSupperFragment<MainEvent>  {

    private final int SET_SHOP_ID = 1;

    private final int SHOW_TOAST  = 2;

    @ViewById(R.id.wv_web)
    WebView myBrowser;

    private WebViewHelper webViewHelper;

    @Override
    public void initData() {
        TencentJavaScriptInterface tencentJavaScriptInterface = new TencentJavaScriptInterface();
        webViewHelper = new WebViewHelper(myBrowser, tencentJavaScriptInterface, handler);
        webViewHelper.initWebView("/h5.html");
    }

    @Override
    public void onEventMainThread(MainEvent event) {
        switch (event.getEventId()) {
            case MainEvent.CLEAR_INFO:
                int step = -2;
                webViewHelper.backStep(step);
                break;
        }
    }
    public class TencentJavaScriptInterface extends WebViewHelper.MyJavaScriptInterface {

        @JavascriptInterface
        public void requestShopId() {
            handler.sendEmptyMessage(SET_SHOP_ID);
        }

        @JavascriptInterface
        public void showToast(String msg) {
            Message message = Message.obtain();
            message.what = SHOW_TOAST;
            message.obj = msg;

            handler.sendMessage(message);
        }
    }

    private Handler handler = new Handler(){
        @Override
        public void handleMessage(Message msg) {

            switch (msg.what) {
                case 0:
                    myBrowser.goBack();
                    break;
                case SET_SHOP_ID:
                    webViewHelper.callJs("setId", 1);
                    break;
                case SHOW_TOAST:
                    Object obj = msg.obj;
                    if (obj != null) {
                        ToastCommom.ToastShow((String) obj);
                    }
                    break;
            }
        }
    };
}