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JsToNativeBridgeActivity.java
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JsToNativeBridgeActivity.java
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package com.hongri.webview;
import android.annotation.TargetApi;
import android.app.Activity;
import android.graphics.Bitmap;
import android.net.Uri;
import android.net.http.SslError;
import android.os.Build.VERSION_CODES;
import android.os.Bundle;
import android.view.ViewGroup;
import android.webkit.JavascriptInterface;
import android.webkit.JsPromptResult;
import android.webkit.JsResult;
import android.webkit.SslErrorHandler;
import android.webkit.WebChromeClient;
import android.webkit.WebResourceError;
import android.webkit.WebResourceRequest;
import android.webkit.WebResourceResponse;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import com.hongri.webview.copy.util.GlobalConstant;
import com.hongri.webview.copy.util.Logger;
import com.hongri.webview.copy.util.ToastUtil;
/**
* @author hongri
* @description JS调用Native方法举例
*/
public class JsToNativeBridgeActivity extends Activity {
private final String TAG = JsToNativeBridgeActivity.class.getSimpleName();
private WebView mWebView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_apiweb_view);
initWebView();
}
private void initWebView() {
mWebView = findViewById(R.id.webView);
WebSettings webSettings = mWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
mWebView.setWebViewClient(new APIWebViewClient());
mWebView.setWebChromeClient(new APIWebChromeClient());
mWebView.addJavascriptInterface(new JsCallAndroidInterface(), "JSCallBackInterface");
mWebView.loadUrl(GlobalConstant.URL_LOCAL_HTML);
}
/**
* WebViewClient 主要用于帮助WebView处理各种通知、请求事件等
*/
private class APIWebViewClient extends WebViewClient {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (resolveShouldLoadLogic(url)) {
return true;
}
return super.shouldOverrideUrlLoading(view, url);
}
@TargetApi(VERSION_CODES.LOLLIPOP)
@Override
public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {
if (resolveShouldLoadLogic(request.getUrl().toString())) {
return true;
}
return super.shouldOverrideUrlLoading(view, request);
}
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
}
@Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
}
/**
* 页面加载每一个资源(如图片)
*
* @param view
* @param url
*/
@Override
public void onLoadResource(WebView view, String url) {
super.onLoadResource(view, url);
Logger.d(TAG, url);
}
/**
* 监听WebView发出的请求并做相应的处理
* (浏览器的渲染以及资源加载都是在一个线程中,如果在shouldInterceptRequest处理时间过长,WebView界面就会阻塞)
*
* @param view
* @param url
* @return API 21以下
*/
@Override
public WebResourceResponse shouldInterceptRequest(WebView view, String url) {
return super.shouldInterceptRequest(view, url);
}
/**
* API 21及以上
*
* @param view
* @param request
* @return
*/
@TargetApi(VERSION_CODES.LOLLIPOP)
@Override
public WebResourceResponse shouldInterceptRequest(WebView view, WebResourceRequest request) {
return super.shouldInterceptRequest(view, request);
}
/**
* 页面加载出错
*
* @param view
* @param errorCode
* @param description
* @param failingUrl
*/
@Override
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
super.onReceivedError(view, errorCode, description, failingUrl);
}
/**
* API 21及以上
*
* @param view
* @param request
* @param error
*/
@TargetApi(VERSION_CODES.LOLLIPOP)
@Override
public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error) {
super.onReceivedError(view, request, error);
}
/**
* https错误
*
* @param view
* @param handler
* @param error
*/
@Override
public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
super.onReceivedSslError(view, handler, error);
}
}
/**
* WebChromeClient主要辅助WebView处理JavaScript对话框,网站图标、网站title、加载进度等
*/
private class APIWebChromeClient extends WebChromeClient {
/**
* 页面加载进度
*
* @param view
* @param newProgress
*/
@Override
public void onProgressChanged(WebView view, int newProgress) {
super.onProgressChanged(view, newProgress);
}
/**
* 加载标题
*
* @param view
* @param title
*/
@Override
public void onReceivedTitle(WebView view, String title) {
super.onReceivedTitle(view, title);
}
/**
* 加载图标
*
* @param view
* @param icon
*/
@Override
public void onReceivedIcon(WebView view, Bitmap icon) {
super.onReceivedIcon(view, icon);
}
/**
* 是否支持页面中的js警告弹出框
*
* @param view
* @param url
* @param message
* @param result
* @return
*/
@Override
public boolean onJsAlert(WebView view, String url, String message, JsResult result) {
return super.onJsAlert(view, url, message, result);
}
/**
* 是否支持页面中的js确定弹出框
*
* @param view
* @param url
* @param message
* @param result
* @return
*/
@Override
public boolean onJsConfirm(WebView view, String url, String message, JsResult result) {
return super.onJsConfirm(view, url, message, result);
}
/**
* 是否支持页面中的js输入弹出框
*
* @param view
* @param url
* @param message
* @param defaultValue
* @param result
* @return
*/
@Override
public boolean onJsPrompt(WebView view, String url, String message, String defaultValue,
JsPromptResult result) {
if (resolveJSPrompt(message)) {
return true;
}
return super.onJsPrompt(view, url, message, defaultValue, result);
}
}
/**
* JS调用android原生方法1:
* <p>
* 通过WebView的addJavascriptInterface()进行对象映射
*/
private class JsCallAndroidInterface {
/**
* @param msg
* @JavascriptInterface注解方法. js端调用,4.2以后安全;4.2以前,当JS拿到Android这个对象后,
* 就可以调用这个Android对象中所有的方法,包括系统类(java.lang.Runtime 类)
* 从而进行任意代码执行。
*/
@JavascriptInterface
public void callback(String msg) {
ToastUtil.showToast(JsToNativeBridgeActivity.this, "JS方法回调到web了 :" + msg);
}
}
/**
* JS调用android原生方法2:
* <p>
* 通过WebViewClient shouldOverrideUrlLoading方法回调拦截url
* <p>
* 根据协议的参数,判断是否是所需要的url:
* 一般根据scheme(协议格式),authority(协议名)来判读
*
* @param url
* @return
*/
private boolean resolveShouldLoadLogic(String url) {
Uri uri = Uri.parse(url);
if (uri.getScheme().equals("remote")) {
if (uri.getAuthority().equals("Authority")) {
ToastUtil.showToast(JsToNativeBridgeActivity.this, "方法2");
}
return true;
}
return false;
}
/**
* JS调用android原生方法3:
* <p>
* 通过WebChromeClient的 onJsAlert() onJsConfirm() onJsPrompt() 方法
* 回调拦截JS对话框alert() confirm() prompt()
*/
private boolean resolveJSPrompt(String message) {
Uri uri = Uri.parse(message);
if (uri.getScheme().equals("remote")) {
if (uri.getAuthority().equals("Authority")) {
ToastUtil.showToast(JsToNativeBridgeActivity.this, "方法3");
}
return true;
}
return false;
}
/**
* 主动清空销毁来避免内存泄漏
*/
@Override
protected void onDestroy() {
if (mWebView != null) {
mWebView.loadDataWithBaseURL(null, "", "text/html", "utf-8", null);
mWebView.clearHistory();
((ViewGroup) mWebView.getParent()).removeView(mWebView);
mWebView.destroy();
mWebView = null;
}
super.onDestroy();
}
}