如何在 WebView 中加载外部网页

我的问题是该网页没有加载在 WebView 内。

mWebview.loadUrl("http://www.google.com");启动网页浏览器..。

这是我的行为准则:

import android.app.Activity;
import android.os.Bundle;
import android.webkit.WebView;


public class Main extends Activity {
    

private WebView mWebview;


@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
        

mWebview = new WebView(this);
mWebview.loadUrl("http://www.google.com");
setContentView(mWebview);
}
}

我在清单中添加了所需的权限:

<uses-permission android:name="android.permission.INTERNET" />
296479 次浏览
小开

试试这个

Xml:

<?xml version="1.0" encoding="utf-8"?>
<WebView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/help_webview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:scrollbars="none"
/>

活动内容:

WebView webView;
setContentView(R.layout.webviewlayout);
webView = (WebView)findViewById(R.id.help_webview);
webView.getSettings().setJavaScriptEnabled(true);
webview.loadUrl("http://www.google.com");

更新

将 webView.setWebViewClient(new WebViewController());添加到活动中。

WebViewController 类:

public class WebViewController extends WebViewClient {


@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
}
小开
最佳答案

多亏了这个 邮寄，我终于找到了解决方案。下面是代码:

import android.app.Activity;
import android.os.Bundle;
import android.webkit.WebResourceError;
import android.webkit.WebResourceRequest;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;
import android.annotation.TargetApi;


public class Main extends Activity {


private WebView mWebview ;


@Override
public void onCreate(Bundle savedInstanceState) {


super.onCreate(savedInstanceState);


mWebview  = new WebView(this);


mWebview.getSettings().setJavaScriptEnabled(true); // enable javascript


final Activity activity = this;


mWebview.setWebViewClient(new WebViewClient() {
@SuppressWarnings("deprecation")
@Override
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
Toast.makeText(activity, description, Toast.LENGTH_SHORT).show();
}
@TargetApi(android.os.Build.VERSION_CODES.M)
@Override
public void onReceivedError(WebView view, WebResourceRequest req, WebResourceError rerr) {
// Redirect to deprecated method, so you can use it in all SDK versions
onReceivedError(view, rerr.getErrorCode(), rerr.getDescription().toString(), req.getUrl().toString());
}
});


mWebview .loadUrl("http://www.google.com");
setContentView(mWebview );


}


}
小开

请使用以下代码:-

Main. Xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent" android:background="@drawable/background">
<RelativeLayout android:layout_width="fill_parent"
android:layout_height="wrap_content" android:background="@drawable/top_heading"
android:id="@+id/rlayout1">
<TextView android:layout_width="wrap_content"
android:layout_centerVertical="true" android:layout_centerHorizontal="true"
android:textColor="#ffffff" android:textSize="22dip"
android:textStyle="bold" android:layout_height="wrap_content"
android:text="More Information" android:id="@+id/txtviewfbdisplaytitle" />
</RelativeLayout>
<RelativeLayout android:layout_width="fill_parent"
android:layout_height="fill_parent" android:layout_below="@+id/rlayout1"
android:id="@+id/rlayout2">
<WebView android:id="@+id/webview1" android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1.0" />
</RelativeLayout>
</RelativeLayout>

MainActivity Java

public class MainActivity extends Activity {
private class MyWebViewClient extends WebViewClient {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
}
Button btnBack;
WebView webview;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.main);


webview=(WebView)findViewById(R.id.webview1);
webview.setWebViewClient(new MyWebViewClient());
openURL();
}


/** Opens the URL in a browser */
private void openURL() {
webview.loadUrl("http://www.google.com");
webview.requestFocus();
}
}

如果有任何查询询问我，请尝试此代码。

小开

在你的活动类中添加下面的方法。这里浏览器只是你的 webview 对象。

现在你可以很容易地查看网页包含页面。

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && browser.canGoBack()) {
browser.goBack();
return true;
}
return false;
}
小开 
public class WebViewController extends WebViewClient {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
}
webView.setWebViewClient(new WebViewController());
小开

你可以这样做。

webView = (WebView) findViewById(R.id.webView1);
webView.getSettings().setJavaScriptEnabled(true);
webView.loadUrl("Your URL goes here");
小开

尝试集成这些代码行非常简单 首先在 Android 清单文件中获得许可

<uses-permission android:name="android.permission.INTERNET" />

然后写一些代码在你的 Activity.xml

<?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"
tools:context="com.example.MainActivity">


<WebView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/help_webview"
android:layout_width="match_parent"
android:layout_height="match_parent"


/>


</LinearLayout>

然后在你的 MainActivity.java中写下这些代码

import android.app.Activity;
import android.content.Intent;
import android.content.res.Resources;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.Window;
import android.webkit.WebResourceRequest;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;


public class MainActivity extends Activity{
private WebView mWebview ;
String link = "";// global variable
Resources res;// global variable
@Override




protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_modernherbal_main);
mWebview  = (WebView) findViewById(R.id.help_webview);
WebSettings webSettings = mWebview.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setUseWideViewPort(true);
webSettings.setLoadWithOverviewMode(true);






final Activity activity = this;


mWebview.setWebViewClient(new WebViewClient() {
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
Toast.makeText(activity, description, Toast.LENGTH_SHORT).show();
}




});


mWebview .loadUrl("http://www.example.com");


}

}

试试这个，它会帮助你解决你的问题

小开

试试这个

webView.loadData("<iframe src='http://www.google.com' style='border: 0; width: 100%; height: 100%'></iframe>", "text/html; charset=utf-8", "UTF-8");
小开

只需进入 XML 文件，给你的 webView 标识，然后在 java 中粘贴这些行:

   public class Main extends Activity {


private WebView mWebview;


@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.Your_layout_file_name);


mWebview = (WebView)findViewById(R.id.id_you_gave _to_your_wenview_in_xml);
mWebview.loadUrl("http://www.google.com");
}
}
小开

在 AndroidManifest.xml 中添加 Internet 权限

<uses-permission android:name="android.permission.INTERNET" />

在你的布局中:

<?xml version="1.0" encoding="utf-8"?>
<WebView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/webView"
/>

在你的活动中

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);


try {
progressDialog = new ProgressDialog(this);
url_Api = "https://learn.microsoft.com/en-us/learn";


webView = this.findViewById(R.id.webView);


progressDialog.setMessage(getString(R.string.connection_Wait));
progressDialog.setIndeterminate(false);
progressDialog.setCancelable(true);
progressDialog.show();


LoadUrlWebView( url_Api );
}catch (Exception e){
Log.w(TAG, "onCreate", e);
}
}


private void LoadUrlWebView( String url_api ) {
try {
webView.setWebViewClient(new WebViewClient());
webView.setWebChromeClient(new MyWebChromeClient( url_api ));
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setSupportZoom(true);
webView.getSettings().setAllowContentAccess(true);
webView.getSettings().setBuiltInZoomControls(true);
webView.getSettings().setDisplayZoomControls(false);


webView.loadUrl(url_api);
} catch (Exception e) {
Log.w(TAG, "setUpNavigationView", e);
}
}


private class MyWebChromeClient extends WebChromeClient {
private String urlAccount;


public MyWebChromeClient( String urlAccount ) {
this.urlAccount = urlAccount;
}


@Override
public void onProgressChanged(WebView view, int newProgress) {
try {
//Tools.LogCat(context, "INSIDE MyWebChromeClient | onProgressChanged / newProgress1:" + newProgress);
progressDialog.setMessage(newProgress + "% " + getString(R.string.connection_Wait));
if (newProgress < 100 && !progressDialog.isShowing()) {
if (progressDialog != null)
progressDialog.show();
}
if (newProgress == 100) {
if (progressDialog != null)
progressDialog.dismiss();
}
}catch (Exception e){
Log.w( "onProgressChanged", e);
}
}


@Override
public void onReceivedTitle(WebView view, String title) {
super.onReceivedTitle(view, title);


sharedPreferences = new Shared_Preferences( context );
sharedPreferences.setPageWebView(view.getUrl());
}


}
小开

我使用的这段代码很酷，但是有一个错误 显示当你使用这个代码，然后你将面临这个问题。。

我有一个解决方案，你必须在 申请附近的 AndroidManifest.xml上加上这个

android:usesCleartextTraffic="true"
<uses-permission android:name="android.permission.INTERNET" /> // ignore if you already added. outside of Application.
小开

添加 WebView 客户端

mWebView.setWebViewClient(new WebViewClient());
小开

您需要添加 WebView 客户端

mWebView.setWebViewClient(new WebViewClient() {


public void onPageFinished(WebView view, String url) {
// do your stuff here
}
});

也可以使用 onPageFinish 在 webview 加载完网页后执行任务

小开

Activity _ main. xml:

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
tools:context=".MainActivity">
<WebView
android:id="@+id/webView"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />


</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java:

package com.example.myapplication;


import androidx.appcompat.app.AppCompatActivity;


import android.os.Bundle;
import android.webkit.WebView;
import android.webkit.WebViewClient;


public class MainActivity extends AppCompatActivity {
private class MyWebViewClient extends WebViewClient {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
}
WebView webView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);


webView = findViewById(R.id.webView);
webView .loadUrl("http://www.google.com");
webView.setWebViewClient(new MyWebViewClient());
}
}

Xml: (add use-mission and android: usesCleartextTraffic)

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.myapplication">


<uses-permission android:name="android.permission.INTERNET" />


<application
android:usesCleartextTraffic="true"
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.MyApplication">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>


</manifest>

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