首先要知道android本身的WebView是並不支援呼叫手機檔案並上傳的，其次WebView的核心在android每次更新的時候都是不太一樣的，也是夠坑爹的；不過需求又不能改，H5需要呼叫系統相簿，還好最後還是找到方法解決了，就是要重寫裡面的一個方法，不過這種情況也是在5.0之前有效，5.0之後就需要重寫另外的一個方法，先將這些方法一個個的列出
注意在這裡我們需要重寫的方法是在這個WebChromeClient類裡面的；

private ValueCallback<Uri> mUploadMessage;
private ValueCallback<Uri[]> mUploadCallbackAboveL;
private
 
 final static int FILECHOOSER_RESULTCODE = 101;

當我們是5.0以下的話，用的是以下三個方法：

public void openFileChooser(ValueCallback<Uri> uploadMsg) {
    Log.d(TAG, "openFileChoose(ValueCallback<Uri> uploadMsg)");
    mUploadMessage = uploadMsg;
    Intent i = new Intent(Intent.ACTION_GET_CONTENT);
    i.addCategory
 
(Intent.CATEGORY_OPENABLE);
    i.setType("image/*");
    Html5Activity.this.startActivityForResult(Intent.createChooser(i, "File Chooser"),
            FILECHOOSER_RESULTCODE);
}

public void openFileChooser(ValueCallback uploadMsg, String acceptType) {
    Log.d(TAG, "openFileChoose( ValueCallback uploadMsg, String acceptType )"
 
);
    mUploadMessage = uploadMsg;
    Intent i = new Intent(Intent.ACTION_GET_CONTENT);
    i.addCategory(Intent.CATEGORY_OPENABLE);
    i.setType("image/*");
    Html5Activity.this.startActivityForResult(
            Intent.createChooser(i, "File Browser"),
            FILECHOOSER_RESULTCODE);
}

public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
    Log.d(TAG, "openFileChoose(ValueCallback<Uri> uploadMsg, String acceptType, String capture)");
    mUploadMessage = uploadMsg;
    Intent i = new Intent(Intent.ACTION_GET_CONTENT);
    i.addCategory(Intent.CATEGORY_OPENABLE);
    i.setType("image/*");
    Html5Activity.this.startActivityForResult(Intent.createChooser(i, "File Browser"),
            FILECHOOSER_RESULTCODE);
}

值得注意的是這三種方法都是一樣的，只是在不同版本下會分別呼叫，還有就是這個方法是重寫這個WebChromeClient類裡面的，別以為是我們隨便寫的，只是google不希望我們重寫這個方法罷了，不過5.0之後就又不一樣了，需要重寫的是下面的這個方法：

@Override
public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, FileChooserParams fileChooserParams) {
    mUploadCallbackAboveL = filePathCallback;
    Intent i = new Intent(Intent.ACTION_GET_CONTENT);
    i.addCategory(Intent.CATEGORY_OPENABLE);
    i.setType("image/*");
    Html5Activity.this.startActivityForResult(
            Intent.createChooser(i, "File Browser"),
            FILECHOOSER_RESULTCODE);
    return true;
}

好了，到了這一步我們的呼叫已經ok了，但還有一個需要的過程；跟我們普通的回撥接收是一模一樣的：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == FILECHOOSER_RESULTCODE) {
        if (null == mUploadMessage && null == mUploadCallbackAboveL) return;
        Uri result = data == null || resultCode != RESULT_OK ? null : data.getData();
        if (mUploadCallbackAboveL != null) {
            onActivityResultAboveL(requestCode, resultCode, data);
        } else if (mUploadMessage != null) {
            mUploadMessage.onReceiveValue(result);
            mUploadMessage = null;
        }
    }
}

當然還有一個是讓我們在5.0的情況下用的：

private void onActivityResultAboveL(int requestCode, int resultCode, Intent data) {
    if (requestCode != FILECHOOSER_RESULTCODE
            || mUploadCallbackAboveL == null) {
        return;
    }
    Uri[] results = null;
    if (resultCode == Activity.RESULT_OK) {
        if (data == null) {
        } else {
            String dataString = data.getDataString();
            ClipData clipData = data.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();
                    Log.e(TAG, "onActivityResultAboveL: " + results[i].getPath());
                }
            }
            if (dataString != null)
                results = new Uri[]{Uri.parse(dataString)};
            Log.e(TAG, "onActivityResultAboveL: " + results.length);
        }
    }
    mUploadCallbackAboveL.onReceiveValue(results);
    mUploadCallbackAboveL = null;
    return;
}

到這一步H5基本就可以正常的呼叫手機的相簿了。