Crosswalk Cordova Android多个文件选择 [英] Crosswalk Cordova Android multiple file select

问题描述

我有一个使用cordova和angularjs构建的混合应用程序，对于Android，我使用人行横道运行该应用程序.

I have a hybrid app built using cordova and angularjs, for Android I run the app using crosswalk.

我一直在互联网上寻找用于html5文件输入的解决方案，以允许选择多个文件.

I've been scouring the internet to find the solution for the html5 file input to allow selection of multiple files.

我正在使用以下元素进行文件选择:

I'm using the following element for file selecting:

<input type="file" multiple="multiple" name="files[]" />

我正在运行Android Lollipop版本5.1.1和Crosswalk版本20，我也已经测试过Crosswalk版本18和19.我安装了运行最新版本的设备上的Chrome，尽管我认为这没有什么不同.

I am running Android Lollipop version 5.1.1 and Crosswalk version 20, I have tested with Crosswalk version 18 and 19 also. Chrome is installed on my device running the latest version although I don't think that makes a difference.

单击上方的输入元素时，出现预期的对话框，要求我从文档"或照相机"中进行选择.如果我选择从文档"中进行选择，那么我只能选择单个文件，在这种情况下为图像.对于我可以从中选择图像的每个应用程序都是如此，因此默认的Android图像"，视频"，音频"等以及外部应用程序(例如Google相册)均全部允许我一次选择一个文件.

When I click the input element above I get the expected dialog asking me to select from my Documents or Camera. If I choose to select from my Documents then I am only able to select single files, in this case images. This is true for every App that I can select images from, so the default android 'Images', 'Videos', 'Audio', etc and external Apps such as Google Photos - All only allow me to select one single file at a time.

在下面的图像中，您可以看到列出的文件，长按每个图块不会将文件添加到多个选择中.

In the image below you can see the files listed, a long press on each tile does not add the file to a multiple selection.

这适用于该应用程序的IOS版本.

This works on the IOS version of the App.

在仔细阅读了所有可以在网上找到的资料之后，似乎运行Chrome 49+的Android 5+支持multiple属性.

After digging through all the material I can find online it seems that the multiple attribute is supported on Android 5+ running Chrome 49+.

我不确定这是人行横道浏览器实现还是Android操作系统问题，还是其他原因?任何人都可以建议.

I'm unsure if this is a crosswalk browser implementation or Android Operating System issue, or something else? Could anyone advise.

修改

仅需确认，无论是否使用Crosswalk，此操作均不起作用.

Just to confirm this does not work with or without using Crosswalk.

推荐答案

经过数周的尝试，我终于找到了解决方案(没有Crosswalk的Cordova).这是在Windows中使用Cordova工具完成的，因此请谅解下面的文件规范.

After weeks of trying to sort this out, I finally got it to work (Cordova without Crosswalk). This was done using Cordova Tools in Windows so please pardon the filespecs below.

步骤1:将platform \ Android \ CordovaLib \ AndroidManifest.xml中的minSdkVersion更改为21 说明:onShowFileChooser API是LOLLIPOP(API 21)中引入的.它允许返回早期的API版本中的url[]而不是showFileChooser返回的url.仅当您将API更改为21或更高版本时，该函数才会被调用.

Step 1: Change the minSdkVersion in platforms\Android\CordovaLib\AndroidManifest.xml to 21 Explanation: onShowFileChooser API was introduced in LOLLIPOP (API 21). It allows returning url[] instead of url returned by showFileChooser in earlier API versions. This gets called only when you change the API to 21 or greater.

步骤2:更新/替换onActivityResult方法以检索多个文件. 在使用fileChooserParams创建意图之后，添加以下内容以允许选择多个文件:

Step 2: Update/Replace the onActivityResult method to retrieve multiple files. Append the following after creating intent using fileChooserParams to allow choosing multiple files:

    intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);

位置: platform \ android \ CordovaLib \ src \ org \ apache \ cordova \ engine \ SystemWebChromeClient.java

Location: platforms\android\CordovaLib\src\org\apache\cordova\engine\SystemWebChromeClient.java

步骤3:更新相应的onActivityResult方法以使用intent.getClipData()返回多个网址.

Step 3: Update the corresponding onActivityResult method to return multiple urls using intent.getClipData().

注意事项:

1. 为所有呼叫启用多重上传.您可以基于fileChooserParams模式更新意图.
2. 在选择器中将相机禁用为源，默认情况下，该功能可用于人行横道.

最终密码:

Uri photoUri;

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
@Override
public boolean onShowFileChooser(WebView webView, final ValueCallback<Uri[]> filePathsCallback, final WebChromeClient.FileChooserParams fileChooserParams) {
    // Check and use MIME Type.
    String mimeType = "*/*";
    int ACTION_CODE = FILECHOOSER_RESULTCODE;
    try {
        if (fileChooserParams.getAcceptTypes().length > 0) {
            mimeType = fileChooserParams.getAcceptTypes()[0];
        } else {
            mimeType = "*/*";
        }
    } catch (Exception e) {
        mimeType = "*/*";
    };

    // Check if Mutiple is specified 
    Boolean selectMultiple = false;
    if (fileChooserParams.getMode() == WebChromeClient.FileChooserParams.MODE_OPEN_MULTIPLE) {
        selectMultiple = true;
    };

    Intent intent = new Intent();
    intent.setAction(Intent.ACTION_GET_CONTENT);
    intent.addCategory(Intent.CATEGORY_OPENABLE);
    if (selectMultiple) { intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true); };
    intent.setType(mimeType);
    ACTION_CODE = FILECHOOSER_RESULTCODE;
    final Intent chooserIntent = Intent.createChooser(intent, "Select Source");

    // Add camera intent to the chooser if image and send URI to return full image 
    if (mimeType.equals("image/*")) {
        photoUri = null;
        try {
            File photoFile = createImageFile();
            photoUri = Uri.fromFile(photoFile);
        }
        catch (Exception ex) {
            photoUri = null;
        }
        if (photoUri != null) {
            Intent camIntent = new Intent();
            camIntent.setAction(MediaStore.ACTION_IMAGE_CAPTURE);
            camIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoUri);
            camIntent.putExtra("return-data", true);
            chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, new Intent [] {camIntent} );
        }
    }

    try {
        parentEngine.cordova.startActivityForResult(new CordovaPlugin() {
            @Override
            public void onActivityResult(int requestCode, int resultCode, Intent intent) {
                if (resultCode ==  Activity.RESULT_OK && intent != null) {
                    if (intent.getData() != null)
                    {
                        Uri[] result = WebChromeClient.FileChooserParams.parseResult(resultCode, intent);
                        filePathsCallback.onReceiveValue(result);
                    }
                    else
                    {
                        if (intent.getClipData() != null) {
                            final int numSelectedFiles = intent.getClipData().getItemCount();
                            Uri[] result = new Uri[numSelectedFiles];
                            for (int i = 0; i < numSelectedFiles; i++) {
                                result[i] = intent.getClipData().getItemAt(i).getUri();
                            }
                            filePathsCallback.onReceiveValue(result);
                        }
                        else {
                            filePathsCallback.onReceiveValue(null);
                        }
                    }
                }
                else if(resultCode ==  Activity.RESULT_OK && (intent == null || intent.getData() == null )) {
                    Uri[] result = new Uri[1];
                    result[0] = photoUri;
                    filePathsCallback.onReceiveValue(result);
                } else {
                    filePathsCallback.onReceiveValue(null);
                }
            }
        }, chooserIntent, ACTION_CODE);
    } catch (ActivityNotFoundException e) {
        Log.w("No activity found to handle file chooser intent.", e);
        filePathsCallback.onReceiveValue(null);
    }
    return true;
}

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