原生暴露API

SystemExposedJsApi.java

该文件定义要暴露给js的方法

package org.apache.cordova.engine;

import android.webkit.JavascriptInterface;

import org.apache.cordova.CordovaBridge;
import org.apache.cordova.ExposedJsApi;
import org.json.JSONException;

/**
 * Contains APIs that the JS can call. All functions in here should also have
 * an equivalent entry in CordovaChromeClient.java, and be added to
 * cordova-js/lib/android/plugin/android/promptbasednativeapi.js
 */
class SystemExposedJsApi implements ExposedJsApi {
    private final CordovaBridge bridge;

    SystemExposedJsApi(CordovaBridge bridge) {
        this.bridge = bridge;
    }

    @JavascriptInterface
    public String exec(int bridgeSecret, String service, String action, String callbackId, String arguments) throws JSONException, IllegalAccessException {
        return bridge.jsExec(bridgeSecret, service, action, callbackId, arguments);
    }

    @JavascriptInterface
    public void setNativeToJsBridgeMode(int bridgeSecret, int value) throws IllegalAccessException {
        bridge.jsSetNativeToJsBridgeMode(bridgeSecret, value);
    }

    @JavascriptInterface
    public String retrieveJsMessages(int bridgeSecret, boolean fromOnlineEvent) throws IllegalAccessException {
        return bridge.jsRetrieveJsMessages(bridgeSecret, fromOnlineEvent);
    }
}

SystemWebViewEngine.java

该文件实现了具体的暴露过程

  SystemExposedJsApi exposedJsApi = new SystemExposedJsApi(bridge);
  webView.addJavascriptInterface(exposedJsApi, "_cordovaNative");

  注:之后通过window._cordovaNative.exec来执行暴露的方法以接收js端传递过来的数据