Android WebView加载H5网页通过WebChromeClient选择设备文件

先写一个web.html作为测试网页文件放到res/assets目录下：

<html>
<body>
<input type="file" value="选择文件">
</body>
</html>

package zhangphil.book;

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.webkit.ValueCallback;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;

public class MainActivity extends AppCompatActivity {

    private WebView mWebView;
    private ValueCallback<Uri[]> mValueCallback;

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

        mWebView = findViewById(R.id.webview);

        mWebView.loadUrl("file:///android_asset/web.html");

        WebSettings mWebSettings = mWebView.getSettings();

        //启用JavaScript。
        mWebSettings.setJavaScriptEnabled(true);
        mWebSettings.setUseWideViewPort(true);

        mWebSettings.setJavaScriptCanOpenWindowsAutomatically(true);

        mWebView.setWebChromeClient(new WebChromeClient() {
            //title：接收网页的标题。
            @Override
            public void onReceivedTitle(WebView view, String title) {
                super.onReceivedTitle(view, title);
                System.out.println(title);
            }

            //加载网页的进度。
            @Override
            public void onProgressChanged(WebView view, int newProgress) {
                super.onProgressChanged(view, newProgress);
                System.out.println(newProgress);
            }

            @Override
            public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, FileChooserParams fileChooserParams) {
                super.onShowFileChooser(webView, filePathCallback, fileChooserParams);

                //在H5网页中打开一个原生的文件选择器选择文件。
                
                Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
                intent.addCategory(Intent.CATEGORY_OPENABLE);
                intent.setType("*/*");
                startActivityForResult(Intent.createChooser(intent, "选择文件"), 2019);

                return true;
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == 2019) {
            
            //选择好的文件路径： data.getData()
            System.out.println(data.getData());
        }
    }
}

Android WebView加载H5网页通过WebChromeClient选择设备文件

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