安卓的WebView可以通过与原生相机和相册进行交互，从而实现调用相机和相册后将结果返回给H5。 首先，我们需要在AndroidManifest.xml文件中添加相机和相册的权限： ``` <uses-permission android:name="android.permission.CAMERA" /> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> ``` 接下来，在我们的WebView的相关代码中，我们需要实现一个WebChromeClient来处理WebView中的文件选择器。在onShowFileChooser方法中，我们可以获取到调用相机和相册所返回的文件路径，然后将其返回给H5页面： ``` webView.getSettings().setJavaScriptEnabled(true); webView.setWebChromeClient(new WebChromeClient() { // Android 5.0+ public boolean onShowFileChooser(WebView view, ValueCallback<Uri[]> filePathCallback, FileChooserParams fileChooserParams) { if (mUploadCallbackAboveL != null) { mUploadCallbackAboveL.onReceiveValue(null); } mUploadCallbackAboveL = filePathCallback; Intent intent = fileChooserParams.createIntent(); try { startActivityForResult(intent, FILE_CHOOSER_RESULT_CODE); } catch (ActivityNotFoundException e) { mUploadCallbackAboveL = null; return false; } return true; } // Android 4.1+ public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) { if (mUploadMessage != null) return; mUploadMessage = uploadMsg; Intent intent = new Intent(Intent.ACTION_GET_CONTENT); if (capture != null && capture.equals("camera")) { intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); // 设置相机拍照后保存图片的路径 File imageStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "AppName"); if (!imageStorageDir.exists()) { imageStorageDir.mkdirs(); } File file = new File(imageStorageDir + File.separator + "IMG_" + String.valueOf(System.currentTimeMillis()) + ".jpg"); mCameraPhotoPath = "file:" + file.getAbsolutePath(); intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(file)); } intent.addCategory(Intent.CATEGORY_OPENABLE); intent.setType("image/*"); try { startActivityForResult(Intent.createChooser(intent, "选择文件"), FILE_CHOOSER_RESULT_CODE); } catch (ActivityNotFoundException e) { mUploadMessage = null; return; } } }); ``` 在我们的Activity中，我们需要重写onActivityResult方法，将照片的路径返回给H5页面： ``` @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (requestCode == FILE_CHOOSER_RESULT_CODE) { if (resultCode == RESULT_OK) { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { if (mUploadCallbackAboveL != null) { Uri[] results = null; if (data != null) { 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)}; } mUploadCallbackAboveL.onReceiveValue(results); mUploadCallbackAboveL = null; } } else { if (mUploadMessage != null) { Uri result = data == null ? Uri.parse(mCameraPhotoPath) : data.getData(); mUploadMessage.onReceiveValue(result); mUploadMessage = null; } } } else { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { if (mUploadCallbackAboveL != null) { mUploadCallbackAboveL.onReceiveValue(null); mUploadCallbackAboveL = null; } } else { if (mUploadMessage != null) { mUploadMessage.onReceiveValue(null); mUploadMessage = null; } } } } } ``` 通过上述代码，当WebView调用相机和相册后，会将结果通过回调的方式返回给H5页面，以便在H5页面上进行处理和展示。