虛擬碼貼上

@Override
    protected void onCreate(Bundle savedInstanceState) {
        mWebView = (WebView) findViewById(R.id.webview); //獲得webView

        initWebView();
}

    private void initWebView() {
        WebSettings settings = mWebView.getSettings();
        settings.setJavaScriptEnabled(true
 
);
        settings.setSupportZoom(false);
        settings.setBuiltInZoomControls(false);

        mWebView.setWebChromeClient(new WebChromeClient() {
            // For Android 3.0+
            public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType) {
                Log.i(
 
"test", "openFileChooser 1");
                SplashActivity.this.uploadFile = uploadMsg;
                openFileChooseProcess();
            }

            // For Android < 3.0
            public void openFileChooser(ValueCallback<Uri> uploadMsgs) {
                Log.i("test", "openFileChooser 2");
                SplashActivity.
 
this.uploadFile = uploadMsgs;
                openFileChooseProcess();
            }

            // For Android  > 4.1.1
            public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
                Log.i("test", "openFileChooser 3");
                SplashActivity.this.uploadFile = uploadMsg;
                openFileChooseProcess();
            }

            // For Android  >= 5.0
            public boolean onShowFileChooser(WebView webView,
                                             ValueCallback<Uri[]> filePathCallback,
                                             WebChromeClient.FileChooserParams fileChooserParams) {
                Log.i("test", "openFileChooser 4:" + filePathCallback.toString());
                SplashActivity.this.uploadFiles = filePathCallback;
                openFileChooseProcess();
                return true;
            }

        });
    }

    private void openFileChooseProcess() {



//      這裡可以做你想做的事情了,比如開啟相機 選擇相簿,或者呼叫第三方的外掛

    }

這裡返回2個值就可以把圖片路徑傳回去了,也可以操作的時候把Uri定義在外面,具體看選擇的方法

    private ValueCallback<Uri> uploadFile;
    private ValueCallback<Uri[]> uploadFiles;

 @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);if (requestCode ==  664) {
            if (resultCode == RESULT_OK) {
                if (null != uploadFile) {
                    Uri result = data == null ? null
                            : data.getData();
                    uploadFile.onReceiveValue(result);
                    uploadFile = null;
                }
                if (null != uploadFiles) {
                    Uri result = data == null ? null
                            : data.getData();
                    uploadFiles.onReceiveValue(new Uri[]{result});
                    uploadFiles = null;
                }
            } else if (resultCode == RESULT_CANCELED) {
                if (null != uploadFile) {
                    uploadFile.onReceiveValue(null);
                    uploadFile = null;
                }
            }
        }
    }