Android APP WebView 为 H5动态授权 H5获取APP权限

前言：平时项目开发时，有时H5需要APP的一些动态权限，Web已支持该需求

下面代码介绍下：

首先创建一个Activity:

1. 布局XML:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white"
    android:orientation="vertical"&gt;
    
    <WebView
        android:id="@+id/webView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" /&gt;


</RelativeLayout&gt;

2.Activity 代码：

public class WebViewActivity extends AppCompatActivity {

    private WebView mWebView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_webview);
        mWebView = findViewById(R.id.webView);

        mWebView.setWebChromeClient(webChromeClient);
        mWebView.getSettings().setJavaScriptEnabled(true);
        mWebView.setInitialScale(25);
        WebSettings webSettings = mWebView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        webSettings.setDomStorageEnabled(true);
        webSettings.setDatabaseEnabled(true);
        webSettings.setAllowFileAccess(true);
        webSettings.setAppCacheEnabled(true);
        webSettings.setSupportZoom(true);
        webSettings.setDefaultTextEncodingName("UTF-8");
        webSettings.setJavaScriptCanOpenWindowsAutomatically(true);
        webSettings.setUseWideViewPort(true);
        webSettings.setBuiltInZoomControls(false);
        webSettings.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.SINGLE_COLUMN);
        webSettings.setLoadWithOverviewMode(true);
        mWebView.loadUrl("目标URL");
    }


    public WebChromeClient webChromeClient = new WebChromeClient() {

        @Override
        public void onPermissionRequest(PermissionRequest request) {
            PermissionUtils.permission(PermissionConstants.CAMERA, PermissionConstants.MICROPHONE, PermissionConstants.STORAGE).rationale(new PermissionUtils.OnRationaleListener() {
                @Override
                public void rationale(UtilsTransActivity activity, ShouldRequest shouldRequest) {
                    shouldRequest.again(true);
                }
            }).callback(new PermissionUtils.FullCallback() {
                @Override
                public void onGranted(List<String> permissionsGranted) {
                    request.grant(request.getResources());
                }

                @Override
                public void onDenied(List<String> permissionsDeniedForever, List<String> permissionsDenied) {
                    if (!permissionsDeniedForever.isEmpty()) {
                        PermissionUtils.launchAppDetailsSettings();
                    }
                }
            }).request();

        }
    };
}

总结：动态设置：setWebChromeClient(@Nullable WebChromeClient client)

当H5获取对应权限的时候，会走 onPermissionRequest(PermissionRequest request)回调，

这个时候客户端Check 下有没有该动态权限，如果没有就动态获取权限，然后再调用：

request.grant(request.getResources());

动态给H5授权，这样H5就可以获取到动态的权限，实现对应的功能了

代码007普通

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