MIUI(Android)使用Webview上传文件

由于业务需求，需要在Android APP的Webview中上传图片，默认点击网页上的input file没有反应，在网上搜索后发现了一个可用的版本：

android使用WebView来打开文件选择器 ，以下是部分代码：

public class BaseWebChromeClient extends WebChromeClient {

    public static final int FILECHOOSER_RESULTCODE = 10000;

    // For Android < 3.0
    public void openFileChooser(ValueCallback<Uri> uploadMsg) {

    }

    // For Android 3.0+
    public void openFileChooser(ValueCallback uploadMsg, String acceptType) {

    }

    //For Android 4.1
        public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {

    }
    //For Android 5.0+
    public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> valueCallback, FileChooserParams fileChooserParams) {
        return true;
    }

    public void onActivityResult(int resultCode, Intent data) {

    }
 }

class WebChromeClientAboveFive extends BaseWebChromeClient {

    private ValueCallback<Uri[]> mUploadCallbackAboveFive;
    private Activity mActivity;

    public WebChromeClientAboveFive(Activity activity) {
        this.mActivity = activity;
    }

    /**
     * 兼容5.0及以上
     *
     * @param webView
     * @param valueCallback
     * @param fileChooserParams
     * @return
     */
    @Override
    public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> valueCallback, android.webkit.WebChromeClient.FileChooserParams fileChooserParams) {
        mUploadCallbackAboveFive = valueCallback;
        Intent i = new Intent(Intent.ACTION_GET_CONTENT);
        i.addCategory(Intent.CATEGORY_OPENABLE);
        i.setType("*/*");
        mActivity.startActivityForResult(Intent.createChooser(i, "File Chooser"), FILECHOOSER_RESULTCODE);
        return true;
    }

    @Override
    public void onActivityResultInternal(int resultCode, Intent data) {
        if (null == mUploadCallbackAboveFive) {
            return;
        }
        Uri[] results = null;
        if (resultCode == Activity.RESULT_OK) {
            if (data != null) {
                String dataString = data.getDataString();
                ClipData clipData = data.getClipData();
                if (clipData != null) {
                    int itemCount = clipData.getItemCount();
                    results = new Uri[itemCount];
                    for (int i = 0; i < itemCount; i++) {
                        ClipData.Item item = clipData.getItemAt(i);
                        results[i] = item.getUri();
                    }
                }
                if (dataString != null) {
                    results = new Uri[]{Uri.parse(dataString)};
                }
            }
        }
        mUploadCallbackAboveFive.onReceiveValue(results);
        mUploadCallbackAboveFive = null;
        return;
    }
}

在Android模拟器上运行OK，可以正常上传图片，但是把APK安装到MIUI之后发现，图片无法正常显示出来，也无法上传，最终发现是文件权限的问题，在AndroidManifest.xml中加上文件权限就OK了：

<!-- 加入在SDCard中创建与删除文件的权限 -->
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
<!-- 加入在SDCard中写入数据的权限 -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />