Android js和原生交互
简单的demo
package com.xindeco.swingu_h5;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.webkit.JavascriptInterface;
import android.webkit.ValueCallback;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.EditText;
import android.widget.Toast;
import com.xindeco.reader.common.Action;
import com.xindeco.reader.common.ReaderListener;
import com.xindeco.reader.common.Tag;
import com.xindeco.reader.swingu.SwingUReader;
public class MainActivity extends AppCompatActivity {
private WebView mWebView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
}
private void init() {
mWebView = findViewById(R.id.web_view);
mWebView.loadUrl("file:///android_asset/test.html");
WebSettings webSettings = mWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
mWebView.addJavascriptInterface(new JsInteration( new CallBack(){
@Override
void callBack(Object o){
}
}
), "android");
mWebView.setWebViewClient(new WebViewClient() {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (url.equals("https://www.baidu.com/")) {
Toast.makeText(MainActivity.this, "就是要拦你", Toast.LENGTH_SHORT).show();
return true;
} else {
mWebView.loadUrl(url);
return true;
}
}
});
findViewById(R.id.call_js).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
final EditText input = findViewById(R.id.input);
String content = input.getText().toString().trim();
if (!TextUtils.isEmpty(content)) {
// 调用js方法，更新页面
// mWebView.loadUrl("javascript:change(\"" + content + "\")"); // 没带返回值的调用方式
mWebView.evaluateJavascript("javascript:change(\"" + content + "\")", new ValueCallback<String>() {
@Override
public void onReceiveValue(String value) {
input.setText(value);
}
});
}
}
});
}
interface CallBack{
void callBack(Object o);
}
public class JsInteration {
Callback callBack;
public JsInteration(CallBack callback){
this.callBack = callback;
}
@JavascriptInterface
public String toast(String msg) {
Toast.makeText(MainActivity.this, msg, Toast.LENGTH_SHORT).show();
return "我是java的返回值";
}
}
}
布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<EditText
android:id="@+id/input"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="我要改变网页的内容"/>
<Button
android:id="@+id/call_js"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="我是原生的button啦"/>
<WebView
android:id="@+id/web_view"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
HTML页面，把该页面放置在assets文件夹下
<html>
<head>
<meta content="text/html; charset=utf-8" http-equiv="content-type">
<title>js和原生交互</title>
</head>
<script type="text/javascript">
<!--该方法调用原生的toast方法-->
function toast(){
var s = document.getElementById("input_toast").value;
var result = window.android.toast(s);
document.getElementById("input_toast").value=result;
}
<!--该方法被原生调用-->
function change(content){
document.getElementById("input_toast").value=content;
return "我是js的返回值";
}
</script>
<body>
<p>
<input type="text" id="input_toast"/>
</p>
<p>
<input type="button" id="toast" value="toast" onclick="toast()"/>
</p>
<a href="https://www.taobao.com/">跳转淘宝，不拦你</a>
<br>
<a href="https://www.baidu.com/">跳转百度，别拦我</a>
</body>
</html>
记得添加<uses-permission android:name="android.permission.INTERNET"/>权限才能访问网络
原文：https://blog.csdn.net/mqdxiaoxiao/article/details/81414935
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