Android开发之带进度条的WebView

效果：

直接上代码：

区分java和kotlin版本

Java版本：

package com.example.progresswebview;

import android.os.Bundle;

import android.view.View;

import android.view.WindowManager;

import android.webkit.WebChromeClient;

import android.webkit.WebSettings;

import android.webkit.WebView;

import android.webkit.WebViewClient;

import android.widget.ProgressBar;

import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

import static android.view.View.GONE;

import static android.view.View.VISIBLE;

/**

* @author xiayiye5

* 2020年6月5日14:47:18

public class JavaWebViewActivity extends AppCompatActivity {

private ProgressBar pbAd;

private WebView wvInternetPage;

private TextView tvWebTitle;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

getWindow().setSoftInputMode(

WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN |

WindowManager.LayoutParams.SOFT_INPUT_ADJUST_UNSPECIFIED);

setContentView(R.layout.activity_webview_browser);

String loadUrl = getIntent().getStringExtra("load_url");

loadUrl = "https://blog.csdn.net/xiayiye5";

String title = getIntent().getStringExtra("title");

title = "下一页5博客首页";

wvInternetPage = findViewById(R.id.pb_webView);

tvWebTitle = findViewById(R.id.tv_web_title);

pbAd = findViewById(R.id.pb_ad);

WebViewOption(loadUrl, title);

}

private void WebViewOption(String loadUrl, String title) {

tvWebTitle.setText(title);

WebSettings settings = wvInternetPage.getSettings();

settings.setJavaScriptEnabled(true);

//允许打开js新窗口

settings.setJavaScriptCanOpenWindowsAutomatically(true);

settings.setDomStorageEnabled(true);

wvInternetPage.setWebViewClient(new MyWebViewClient());

wvInternetPage.setWebChromeClient(new MyChromeWebViewClient());

wvInternetPage.loadUrl(loadUrl);

}

private class MyWebViewClient extends WebViewClient {

@Override

public boolean shouldOverrideUrlLoading(WebView view, String url) {

return super.shouldOverrideUrlLoading(view, url);

}

@Override

public void onPageFinished(WebView view, String url) {

tvWebTitle.setText(view.getTitle());

super.onPageFinished(view, url);

}

private class MyChromeWebViewClient extends WebChromeClient {

@Override

public void onProgressChanged(WebView view, int newProgress) {

if (newProgress == 100) {

pbAd.setVisibility(View.INVISIBLE);

} else {

if (pbAd.getVisibility() == GONE) {

pbAd.setVisibility(VISIBLE);

}

pbAd.setProgress(newProgress);

}

super.onProgressChanged(view, newProgress);

}

@Override

public void onBackPressed() {

if (wvInternetPage.canGoBack()) {

wvInternetPage.goBack();

return;

}

super.onBackPressed();

}

kotlin版本：

package com.example.progresswebview

import android.os.Bundle

import android.view.View

import android.view.WindowManager

import android.webkit.WebChromeClient

import android.webkit.WebView

import android.webkit.WebViewClient

import android.widget.ProgressBar

import android.widget.TextView

import androidx.appcompat.app.AppCompatActivity

/**

* @author xiayiye5

* 2020年6月5日14:47:18

class KotlinWebViewActivity : AppCompatActivity() {

private var pbAd: ProgressBar? = null

private var wvInternetPage: WebView? = null

private var tvWebTitle: TextView? = null

override fun onCreate(savedInstanceState: Bundle?) {

super.onCreate(savedInstanceState)

window.setSoftInputMode(

WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN or

WindowManager.LayoutParams.SOFT_INPUT_ADJUST_UNSPECIFIED

)

setContentView(R.layout.activity_webview_browser)

var loadUrl = intent.getStringExtra("load_url")

loadUrl = "https://blog.csdn.net/xiayiye5/category_7513606.html"

var title = intent.getStringExtra("title")

title = "下一页5|git的使用"

wvInternetPage = findViewById(R.id.pb_webView)

tvWebTitle = findViewById(R.id.tv_web_title)

pbAd = findViewById(R.id.pb_ad)

WebViewOption(loadUrl, title)

}

private fun WebViewOption(loadUrl: String, title: String) {

tvWebTitle!!.text = title

val settings = wvInternetPage!!.settings

settings.javaScriptEnabled = true

//允许打开js新窗口

settings.javaScriptCanOpenWindowsAutomatically = true

settings.domStorageEnabled = true

wvInternetPage!!.webViewClient = MyWebViewClient()

wvInternetPage!!.webChromeClient = MyChromeWebViewClient()

wvInternetPage!!.loadUrl(loadUrl)

}

private inner class MyWebViewClient : WebViewClient() {

override fun shouldOverrideUrlLoading(

view: WebView,

url: String

): Boolean {

return super.shouldOverrideUrlLoading(view, url)

}

override fun onPageFinished(view: WebView, url: String) {

tvWebTitle!!.text = view.title

super.onPageFinished(view, url)

}

private inner class MyChromeWebViewClient : WebChromeClient() {

override fun onProgressChanged(view: WebView, newProgress: Int) {

if (newProgress == 100) {

pbAd!!.visibility = View.INVISIBLE

} else {

if (pbAd!!.visibility == View.GONE) {

pbAd!!.visibility = View.VISIBLE

}

pbAd!!.progress = newProgress

}

super.onProgressChanged(view, newProgress)

}

override fun onBackPressed() {

if (wvInternetPage!!.canGoBack()) {

wvInternetPage!!.goBack()

return

}

super.onBackPressed()

}

再看下布局文件：

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"