在android webview上启用输入文件摄像头

Question

我正在创建一个网络视图，以加载一个外部网站。

在这个网站上，我有一个带有输入文件的表格。点击它应该会打开手机的摄像头，但这并没有发生。

看起来网络视图有一些阻塞。如何解决此问题？

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="br.com.app...">
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<application
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/AppTheme">
<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>

主活动.java

package br.com.app...;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
public class MainActivity extends AppCompatActivity {
private WebView webView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
this.getSupportActionBar().hide();
webView = findViewById(R.id.webView);
webView.setWebViewClient(new WebViewClient());
webView.loadUrl("https://apps.url/loja/index.php");
WebSettings webSettings = webView.getSettings();
webSettings.setJavaScriptEnabled(true);
}
}

Answer 1

首先，您应该在HTML文件中添加以下代码

<input type="button" value="Say hello" onClick="showAndroidCamera()" />
<script type="text/javascript">
function showAndroidCamera() {
Android.openCamera();
}
</script>

在安卓侧中创建一个类之后

class WebAppInterface(private val mContext: Context) {
/** Show a toast from the web page  */
@JavascriptInterface
fun openCamera() {
//This method called when user clicks on webview button.
Toast.makeText(mContext, open Camera, Toast.LENGTH_SHORT).show()
}
}

并将WebAppInterface处理程序添加到您的webview

webView.addJavascriptInterface(WebAppInterface(this), "Android")

例如

public class MainActivity extends AppCompatActivity {
private WebView webView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
this.getSupportActionBar().hide();
webView = findViewById(R.id.webView);
webView.setWebViewClient(new WebViewClient());
webView.loadUrl("https://apps.url/loja/index.php");
WebSettings webSettings = webView.getSettings();
webSettings.setJavaScriptEnabled(true);
webView.addJavascriptInterface(WebAppInterface(this), "Android")

}
}
class WebAppInterface(private val mContext: Context) {
/** Show a toast from the web page  */
@JavascriptInterface
fun openCamera() {
//This method called when user clicks on webview button.
Toast.makeText(mContext, open Camera, Toast.LENGTH_SHORT).show()
}
}

有关更多信息，请：Android Webview