安卓内核开发

其实是Android的webview默认是不支持<input type="file"/>文件上传的。现在的前端页面需要处理的是：

权限

文件路径AndroidManifest.xml

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

宿主返回代码

   private ValueCallback<Uri> uploadMessage;
    private ValueCallback<Uri[]> uploadMessageAboveL;
    private final static int FILE_CHOOSER_RESULT_CODE = 10000;

    // 2.回调方法触发本地选择文件
    private void openImageChooserActivity() {
        Intent i = new Intent(Intent.ACTION_GET_CONTENT);
        i.addCategory(Intent.CATEGORY_OPENABLE);
//        i.setType("image/*");//图片上传
//        i.setType("file/*");//文件上传
        i.setType("*/*");//文件上传
        startActivityForResult(Intent.createChooser(i, "Image Chooser"), FILE_CHOOSER_RESULT_CODE);
    }
    // 3.选择图片后处理
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == FILE_CHOOSER_RESULT_CODE) {
            if (null == uploadMessage && null == uploadMessageAboveL) return;
            Uri result = data == null || resultCode != RESULT_OK ? null : data.getData();
            // Uri result = (((data == null) || (resultCode != RESULT_OK)) ? null : data.getData());
            if (uploadMessageAboveL != null) {
                onActivityResultAboveL(requestCode, resultCode, data);
            } else if (uploadMessage != null) {
                uploadMessage.onReceiveValue(result);
                uploadMessage = null;
            }
        } else {
            //这里uploadMessage跟uploadMessageAboveL在不同系统版本下分别持有了
            //WebView对象，在用户取消文件选择器的情况下，需给onReceiveValue传null返回值
            //否则WebView在未收到返回值的情况下，无法进行任何操作，文件选择器会失效
            if (uploadMessage != null) {
                uploadMessage.onReceiveValue(null);
                uploadMessage = null;
            } else if (uploadMessageAboveL != null) {
                uploadMessageAboveL.onReceiveValue(null);
                uploadMessageAboveL = null;
            }
        }
    }

    // 4. 选择内容回调到Html页面
    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    private void onActivityResultAboveL(int requestCode, int resultCode, Intent intent) {
        if (requestCode != FILE_CHOOSER_RESULT_CODE || uploadMessageAboveL == null)
            return;
        Uri[] results = null;
        if (resultCode == Activity.RESULT_OK) {
            if (intent != null) {
                String dataString = intent.getDataString();
                ClipData clipData = intent.getClipData();
                if (clipData != null) {
                    results = new Uri[clipData.getItemCount()];
                    for (int i = 0; i < clipData.getItemCount(); i++) {
                        ClipData.Item item = clipData.getItemAt(i);
                        results[i] = item.getUri();
                    }
                }
                if (dataString != null)
                    results = new Uri[]{Uri.parse(dataString)};
            }
        }
        uploadMessageAboveL.onReceiveValue(results);
        uploadMessageAboveL = null;
    }

webview完整扩展

private class Cyber_ChromeClient extends WebChromeClient {
{
        @Override
        public void onProgressChanged(WebView view, int newProgress) {
            super.onProgressChanged(view, newProgress);
            //  mProgress.setProgress(newProgress);

        }

        @Override
        public void onReceivedTitle(WebView view, String title) {
            super.onReceivedTitle(view, title);
            // mTitle.setText(title);
        }

        @Override
        public void onReceivedIcon(WebView view, Bitmap icon) {
            super.onReceivedIcon(view, icon);
        }

        @Override
        public boolean onJsAlert(WebView view, String url, String message, final android.webkit.JsResult result) {
            new AlertDialog.Builder(cyber_instance)
                    .setTitle("悠然智慧管理4.0")
                    .setMessage(message)
                    .setPositiveButton(android.R.string.ok,
                            new AlertDialog.OnClickListener() {


                                public void onClick(DialogInterface arg0, int arg1) {
                                    // TODO Auto-generated method stub
                                    result.confirm();

                                }
                            }).setCancelable(false).create().show();

            return true;
        }

        //2020-5-15

        /**
         * 对网络连接状态进行判断
         * @return  true, 可用； false， 不可用
         */
        private boolean isOpenNetwork() {
            ConnectivityManager connManager = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo networkInfo = connManager.getActiveNetworkInfo();     if(networkInfo!= null) {
                //2.获取当前网络连接的类型信息
                //
                int networkType = networkInfo.getType();
                if(ConnectivityManager.TYPE_WIFI == networkType){
                    //当前为wifi网络
                }else if(ConnectivityManager.TYPE_MOBILE == networkType){
                    //当前为mobile网络
                }
                return connManager.getActiveNetworkInfo().isAvailable(); }

            return false;
        }

        /**
         * 覆盖默认的window.confirm展示界面，避免title里显示为“：来自file:”
         */
        public boolean onJsConfirm(WebView view, String url, String message,
                                   final JsResult result) {
            final AlertDialog.Builder builder = new AlertDialog.Builder(view.getContext());
            builder.setTitle("优然智慧管理系统")
                    .setMessage(message)
                    .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            result.confirm();
                        }
                    })
                    .setNeutralButton("取消", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            result.cancel();
                        }
                    });
            builder.setOnCancelListener(new DialogInterface.OnCancelListener() {
                @Override
                public void onCancel(DialogInterface dialog) {
                    result.cancel();
                }
            });

            // 屏蔽keycode等于84之类的按键，避免按键后导致对话框消息而页面无法再弹出对话框的问题
            builder.setOnKeyListener(new DialogInterface.OnKeyListener() {
                @Override
                public boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) {
                    //Log.v("onJsConfirm", "keyCode==" + keyCode + "event="+ event);
                    return true;
                }
            });
            // 禁止响应按back键的事件
            // builder.setCancelable(false);
            AlertDialog dialog = builder.create();
            dialog.show();
            return true;
            // return super.onJsConfirm(view, url, message, result);
        }

        /**
         * 覆盖默认的window.prompt展示界面，避免title里显示为“：来自file:”
         * window.prompt('请输入您的域名地址', '618119.com');
         */
        public boolean onJsPrompt(WebView view, String url, String message,
                                  String defaultValue, final JsPromptResult result) {
            final AlertDialog.Builder builder = new AlertDialog.Builder(view.getContext());


            builder.setTitle("优然智慧管理系统").setMessage(message);

            final EditText et = new EditText(view.getContext());
            et.setSingleLine();
            et.setText(defaultValue);


            builder.setView(et)
                    .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            result.confirm(et.getText().toString());


                        }

                    })
                    .setNeutralButton("取消", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            result.cancel();
                        }
                    });

            // 屏蔽keycode等于84之类的按键，避免按键后导致对话框消息而页面无法再弹出对话框的问题
            builder.setOnKeyListener(new DialogInterface.OnKeyListener() {
                public boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) {
                    //Log.v("onJsPrompt", "keyCode==" + keyCode + "event="+ event);
                    if (keyCode == KeyEvent.KEYCODE_ENTER) {
                        result.confirm(et.getText().toString());
                        dialog.dismiss();
                        return true;

                    }else{
                        return false;
                    }

                    //
                }
            });

            // 禁止响应按back键的事件
            // builder.setCancelable(false);
            final  AlertDialog    dialog = builder.create();

            //2021-3-18 回车检测
            et.setOnKeyListener(new View.OnKeyListener() {
                @Override
                public boolean onKey(View v, int keyCode, KeyEvent event) {
                    if (keyCode == KeyEvent.KEYCODE_ENTER) {
                        // 监听到回车键，会执行2次该方法。按下与松开
                        result.confirm(et.getText().toString());
                        dialog.dismiss();

                    }
                    return false;

                }
            });

            dialog.show();
            return true;
            // return super.onJsPrompt(view, url, message, defaultValue,
            // result);
        }
        /2020-5-15


        //20240604 文件
        // For Android < 3.0
        public void openFileChooser(ValueCallback<Uri> valueCallback) {
            uploadMessage = valueCallback;
            openImageChooserActivity();
        }

        // For Android  >= 3.0
        public void openFileChooser(ValueCallback valueCallback, String acceptType) {
            uploadMessage = valueCallback;
            openImageChooserActivity();
        }

        //For Android  >= 4.1
        public void openFileChooser(ValueCallback<Uri> valueCallback, String acceptType, String capture) {
            uploadMessage = valueCallback;
            openImageChooserActivity();
        }

        // For Android >= 5.0
        @Override
        public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, WebChromeClient.FileChooserParams fileChooserParams) {
            uploadMessageAboveL = filePathCallback;
            openImageChooserActivity();
            return true;
        }




    }
}

调用浏览

  //非常重要
        cwpd_Web.setWebViewClient(new Cyber_WebviewClient());
        cwpd_Web.setWebChromeClient(new Cyber_ChromeClient());