安卓开发入门教程-通过WebView打开网页 什么是WebView 基础样例

什么是WebView

WebView是用来打开网页的一种UI控件,可以在App内跳转到指定网址,而不是采用系统浏览器打开网页.

基础样例

效果图

实现方案

• activity

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        val url = "https://www.baidu.com"
        setSettings()
        webView.loadUrl(url)
    }

    private fun setSettings() {
        val settings = webView.settings
        settings.javaScriptEnabled = true//设置WebView属性，能够执行Javascript脚本
        settings.cacheMode = WebSettings.LOAD_NO_CACHE
        settings.layoutAlgorithm = WebSettings.LayoutAlgorithm.NORMAL
        settings.allowFileAccess = true //设置可以访问文件
        settings.builtInZoomControls = false //设置支持缩放
        settings.setSupportZoom(true)
        settings.useWideViewPort = true
        settings.loadWithOverviewMode = true
        settings.setAppCacheEnabled(true)
        settings.domStorageEnabled = true
        settings.databaseEnabled = true
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            settings.mixedContentMode = WebSettings.MIXED_CONTENT_ALWAYS_ALLOW
        }
    }
}

• 布局文件activity_main.xml:

<?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">

    <WebView
        android:id="@+id/webView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</LinearLayout>

• Manifest中增加权限

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

完整源代码

https://gitee.com/cxyzy1/webviewDemo