我们在开发需求的时候，难免会接入一下第三方的H5页面，有些H5页面是具有上传照片的功能，Android 中的 WebView是不能直接打开文件选择弹框的

接下来我讲简单提供一下解决方案，先说一下思路

1.接收WebView打开文件选择器的通知

2.收到通知后，打开文件选择器等待用户选择需要上传的文件

3.在onActivityResult中得到用户选择的文件的Uri

4.然后把Uri传递给Html5

这样就完成了一次H5选择文件的过程，下面我把代码贴出来自习看一下

 

首先，WebView必须要支持JS交互，所以要打开JS交互

mWebView.getSettings().setjava scriptEnabled(true);

 

当H5在调用上传文件的Api的时候，WebView会回调 openFileChooser和onShowFileChooser 方法来通知我们，我们这个时候要做的就是重写这个方法

需要注意的是这个方法在不同的Api上会回调不同行参方法

mWebView.setWebChromeClient(new WebChromeClient() {


            @Override
            public void onProgressChanged(WebView view, int newProgress) {
                if (newProgress == 100) {
                    mBar.setVisibility(View.GONE);
                } else {
                    mBar.setVisibility(View.VISIBLE);
                    mBar.setProgress(newProgress);
                }
                super.onProgressChanged(view, newProgress);
            }

            //For Android API < 11 (3.0 OS)
            public void openFileChooser(ValueCallback<Uri> valueCallback) {
                uploadMessage = valueCallback;
                openImageChooserActivity();
            }

            //For Android API >= 11 (3.0 OS)
            public void openFileChooser(ValueCallback<Uri> valueCallback, String acceptType, String capture) {
                uploadMessage = valueCallback;
                openImageChooserActivity();
            }

            //For Android API >= 21 (5.0 OS)
            @Override
            public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, WebChromeClient.FileChooserParams fileChooserParams) {
                uploadMessageAboveL = filePathCallback;
                openImageChooserActivity();
                return true;
            }

        });

 

我们在openFileChooser方法中先保存了一下ValueCallback的回调对象，这个对象最后用来通知H5文件地址，我们之后在调用openFileChooser方法来打开文件选择器

 private void openImageChooserActivity() {
        Intent i = new Intent(Intent.ACTION_GET_CONTENT);
        i.addCategory(Intent.CATEGORY_OPENABLE);
        i.setType("image/*");
        startActivityForResult(Intent.createChooser(i, "Image Chooser"), FILE_CHOOSER_RESULT_CODE);
    }

 

当用户选择完文件后，会调用onActivityResult方法，我们重写并等待回调

@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();
            if (uploadMessageAboveL != null) {
                onActivityResultAboveL(requestCode, resultCode, data);
            } else if (uploadMessage != null) {
                uploadMessage.onReceiveva lue(result);
                uploadMessage = null;
            }
        }
    }

    @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.onReceiveva lue(results);
        uploadMessageAboveL = null;
    }

 

onActivityResult就是用来通知H5用户选择的文件地址，在这个方法里，用我们之前保存的ValueCallback对象，调用onReceiv