The effect is as shown in the figure:
There is no way to directly obtain the text. What is used is to inject through js, call the js function, use js to call the Android method and pass in the content in <html></html> of the interface.
Layout content:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="vertical">
<EditText
android:id="@+id/et_url"
android:maxLines="1"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<Button
android:id="@+id/btn_go"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="go" />
<LinearLayout
android:id="@+id/lin_web"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"/>
</LinearLayout>
<ScrollView
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1">
<TextView
android:id="@+id/tv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:typeface="monospace" />
</ScrollView>
</LinearLayout>Interface code:
import android.annotation.SuppressLint;
import android.net.http.SslError;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.ViewGroup;
import android.webkit.JavascriptInterface;
import android.webkit.SslErrorHandler;
import android.webkit.WebResourceRequest;
import android.webkit.WebResourceResponse;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
public class WebActivity extends AppCompatActivity {
private final String TAG = "WebActivity";
private WebView webView;
private TextView tv;
private EditText etUrl;
private Button btnGo;
private LinearLayout webLin;
@SuppressLint({"AddJavascriptInterface", "SetJavaScriptEnabled"})
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_web);
tv = findViewById(R.id.tv);
webLin = findViewById(R.id.lin_web);
etUrl = findViewById(R.id.et_url);
btnGo = findViewById(R.id.btn_go);
etUrl.setText("www.baidu.com");
addWebView();
initWebSetting();
initListener();
}
private void initListener() {
btnGo.setOnClickListener(v -> {
String url = etUrl.getText().toString();
if(!url.startsWith("http")){
url = "https://"+url;
}
webView.loadUrl(url);
});
}
@SuppressLint("AddJavascriptInterface")
private void addWebView() {
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
webView = new WebView(getApplicationContext());
webView.setLayoutParams(params);
webLin.addView(webView);
webView.addJavascriptInterface(new InJavaScriptLocalObj(),"java_obj");
webView.setWebViewClient(webViewClient);
}
private WebViewClient webViewClient = new WebViewClient(){
@Override
public void onPageFinished(WebView view, String url) {
// 在结束加载网页时会回调
Log.i(TAG, "onPageFinished: "+url);
etUrl.setText(url);
// 获取页面内容
view.loadUrl("javascript:window.java_obj.showSource("
+ "document.getElementsByTagName('html')[0].innerHTML);");
super.onPageFinished(view, url);
}
@Override
public void onReceivedError(WebView view, int errorCode,
String description, String failingUrl) {
// 加载错误的时候会回调，在其中可做错误处理，比如再请求加载一次，或者提示404的错误页面
super.onReceivedError(view, errorCode, description, failingUrl);
tv.setText(description);
Log.i(TAG, "onReceivedError: description:"+description);
Log.i(TAG, "onReceivedError: failingUrl:"+failingUrl);
}
@Override
public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
// handler.cancel();// Android默认的处理方式
handler.proceed();// 接受所有网站的证书
}
@Override
public WebResourceResponse shouldInterceptRequest(WebView view,
WebResourceRequest request) {
// 在每一次请求资源时，都会通过这个函数来回调
return super.shouldInterceptRequest(view, request);
}
};
public final class InJavaScriptLocalObj{
@JavascriptInterface
public void showSource(String html) {
html = html.replaceAll(">",">\n\t");
html = html.replaceAll("</","\n</");
tv.setText(html);
}
}
@SuppressLint("SetJavaScriptEnabled")
private void initWebSetting() {
WebSettings webSettings = webView.getSettings();
webSettings.setDefaultZoom(WebSettings.ZoomDensity.MEDIUM); //设置页面默认缩放密度
webSettings.setDefaultTextEncodingName("UTF-8"); //设置默认的文本编码名称，以便在解码html页面时使用
webSettings.setAllowContentAccess(true); //启动或禁用WebView内的内容URL访问
webSettings.setAppCacheEnabled(false); //设置是否应该启用应用程序缓存api
webSettings.setBuiltInZoomControls(false); //设置WebView是否应该使用其内置的缩放机制
webSettings.setUseWideViewPort(true); //设置WebView是否应该支持viewport
webSettings.setLoadWithOverviewMode(true); //不管WebView是否在概述模式中载入页面，将内容放大适合屏幕宽度
webSettings.setCacheMode(WebSettings.LOAD_NO_CACHE); //重写缓存的使用方式
webSettings.setJavaScriptCanOpenWindowsAutomatically(true); //告知js自动打开窗口
webSettings.setLoadsImagesAutomatically(true); //设置WebView是否应该载入图像资源
webSettings.setAllowFileAccess(true); //启用或禁用WebView内的文件访问
webSettings.setDomStorageEnabled(true); //设置是否启用了DOM存储API,
//支持屏幕缩放
webSettings.setSupportZoom(true);
//支持js
webSettings.setJavaScriptEnabled(true);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
webSettings.setMixedContentMode(WebSettings.MIXED_CONTENT_ALWAYS_ALLOW);
}
}
@Override
public void onPause() {
super.onPause();
webView.onPause();
webView.pauseTimers();
}
@Override
public void onResume() {
super.onResume();
webView.onResume();
webView.resumeTimers();
}
@Override
protected void onDestroy() {
webLin.removeView(webView);
if (webView != null) {
webView.clearHistory();
((ViewGroup) webView.getParent()).removeView(webView);
webView.loadUrl("about:blank");
webView.stopLoading();
webView.setWebChromeClient(null);
webView.setWebViewClient(null);
webView.destroy();
webView = null;
}
super.onDestroy();
}
}