android webview与js交互掉起相册以及拍照，获取图片

1.申请需要的权限

这块注意权限动态申请。

2.初始化webview 

private ValueCallback uploadFile;//定义接受返回值
private ValueCallback uploadFiles;

WebSettings webSettings = webview.getSettings();
webSettings.setJavaScriptEnabled(true);

webview.setWebChromeClient(new WebChromeClient() {

    @Override
    public void onProgressChanged(WebView view, int newProgress) {
        super.onProgressChanged(view, newProgress);

    }

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

    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    @Override
    public void onPermissionRequest(PermissionRequest request) {
        //                super.onPermissionRequest(request);//必须要注视掉
        request.grant(request.getResources());
    }

    // For Android 3.0+
    public void openFileChooser(ValueCallback uploadMsg, String acceptType) {
        uploadFile = uploadFile;
  //打开相册或者拍照
     openFileOrTakePhoto();
    }

    // For Android < 3.0
    public void openFileChooser(ValueCallback uploadMsgs) {
        uploadFile = uploadFile;
       openFileOrTakePhoto();
    }

    // For Android  > 4.1.1
    public void openFileChooser(ValueCallback uploadMsg, String acceptType, String capture) {
        uploadFile = uploadFile;
      openFileOrTakePhoto();
    }

    // For Android  >= 5.0
    @Override
    public boolean onShowFileChooser(WebView webView,
                                     ValueCallback filePathCallback,
                                     WebChromeClient.FileChooserParams fileChooserParams) {
        uploadFiles = filePathCallback;
       openFileOrTakePhoto();
        return true;
    }
});

/**
 * /这块可以用一个弹出控件选择相册还是拍照 注意当取消这次操作的时候一定要将uploadFile与uploadFiles重新为null，不然将无法再次打开相册或者拍照代码为：

if (uploadFile != null) {
    uploadFile.onReceiveValue(null);
    uploadFile = null;
}
if (uploadFiles != null) {
    uploadFiles.onReceiveValue(null);
    uploadFiles = null;
}

 */
private void openFileOrTakePhoto() {
//打开相册的代码
    Intent i = new Intent(Intent.ACTION_GET_CONTENT);
    i.addCategory(Intent.CATEGORY_OPENABLE);
    i.setType("image/*");
   startActivityForResult(Intent.createChooser(i, "Choose"), CHOOSE_REQUEST_CODE);
//调取拍照的代码这块注意7.0之后通过FileProvider获取文件

String cameraSavePath = new File(Environment.getExternalStorageDirectory().getPath() + "/" + System.currentTimeMillis() + ".jpg");

Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
    //第二个参数为 包名.fileprovider
    imageUri = FileProvider.getUriForFile(WebActivity.this, MyApplication.getContext().getPackageName()+".fileprovider", cameraSavePath);
    intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
} else {
    imageUri = Uri.fromFile(cameraSavePath);
}
intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
startActivityForResult(intent, FILE_CAMERA_RESULT_CODE);

}

/**
 * 重写onActivityResult获取返回值
 */
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (resultCode == Activity.RESULT_OK) {
        switch (requestCode) {
            case CHOOSE_REQUEST_CODE:
                if (null != uploadFile) {
                    Uri result = data == null || resultCode != Activity.RESULT_OK ? null
                            : data.getData();
                    uploadFile.onReceiveValue(result);
                    uploadFile = null;
                }
                if (null != uploadFiles) {
                    Uri result = data == null || resultCode != Activity.RESULT_OK ? null
                            : data.getData();
                    uploadFiles.onReceiveValue(new Uri[]{result});
                    uploadFiles = null;
                }
                break;
            case FILE_CAMERA_RESULT_CODE:
                if (null == uploadFile && null == uploadFiles) return;
                Uri result = data == null || resultCode != Activity.RESULT_OK ? null : data.getData();
                if (uploadFiles != null) {
                    onActivityResultAboveL(requestCode, resultCode, data);
                } else if (uploadFile != null) {
                    uploadFile.onReceiveValue(result);
                    uploadFile = null;
                }
                break;
            default:
                break;
        }
    } else if (resultCode == Activity.RESULT_CANCELED) {
        if (null != uploadFile) {
            uploadFile.onReceiveValue(null);
            uploadFile = null;
        }
        if (null != uploadFiles) {
            uploadFiles.onReceiveValue(null);
            uploadFiles = null;
        }
    }
    super.onActivityResult(requestCode, resultCode, data);
}

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
private void onActivityResultAboveL(int requestCode, int resultCode, Intent data) {
    if (requestCode != FILE_CAMERA_RESULT_CODE || uploadFiles == null) {
        return;
    }
    Uri[] results = null;
    if (resultCode == Activity.RESULT_OK) {
        if (data == null) {
            results = new Uri[]{imageUri};
        } 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();
                }
            }

            if (dataString != null)
                results = new Uri[]{Uri.parse(dataString)};
        }
    }
    uploadFiles.onReceiveValue(results);
    uploadFiles = null;
}