Webview之H5页面调用android的图库及文件管理

一般页面在pc打开文件管理器是用 type=”file”的代码，可是这在Android的webview是无效的，必须为webview设定WebChromeClient代码如下：

1. mWebview.setWebChromeClient(((HomeActivity) mContext).mOpenFileWebChromeClient);
2. OpenFileWebChromeClient类中重写并添加onShowFileChooser、openFileChooser：这样才会打开文件管理器，但是还需要把选择的地址穿回到页面，具体看3.

public class OpenFileWebChromeClient extends WebChromeClient {
public static final int REQUEST_FILE_PICKER = 1;
public ValueCallback<Uri> mFilePathCallback;
public ValueCallback<Uri[]> mFilePathCallbacks;
Activity mContext;
public OpenFileWebChromeClient(Activity mContext){
super();
this.mContext = mContext;
}
// Android < 3.0 调用这个方法
public void openFileChooser(ValueCallback<Uri> filePathCallback) {
mFilePathCallback = filePathCallback;
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("*/*");
mContext.startActivityForResult(Intent.createChooser(intent, "File Chooser"),
REQUEST_FILE_PICKER);
}
// 3.0 + 调用这个方法
public void openFileChooser(ValueCallback filePathCallback,
String acceptType) {
mFilePathCallback = filePathCallback;
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("*/*");
mContext.startActivityForResult(Intent.createChooser(intent, "File Chooser"),
REQUEST_FILE_PICKER);
}
//  / js上传文件的<input type="file" name="fileField" id="fileField" />事件捕获
// Android > 4.1.1 调用这个方法
public void openFileChooser(ValueCallback<Uri> filePathCallback,
String acceptType, String capture) {
mFilePathCallback = filePathCallback;
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("*/*");
mContext.startActivityForResult(Intent.createChooser(intent, "File Chooser"),
REQUEST_FILE_PICKER);
}

@Override
public boolean onShowFileChooser(WebView webView,
ValueCallback<Uri[]> filePathCallback,
WebChromeClient.FileChooserParams fileChooserParams) {
mFilePathCallbacks = filePathCallback;
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("*/*");
mContext.startActivityForResult(Intent.createChooser(intent, "File Chooser"),
REQUEST_FILE_PICKER);
return true;
}
}

3.地址回传至页面：
在2中提到了.startActivityForResult(Intent.createChooser(intent, "File Chooser")，这个里面会回调activity的onActivityResult方法，所以在所在的activity中添加如下代码：

/**
* 以下是webview的照片上传时候，用于在网页打开android图库文件
*/
public OpenFileWebChromeClient mOpenFileWebChromeClient = new OpenFileWebChromeClient(
this);

@Override
public void onActivityResult(int requestCode, int resultCode, Intent intent) {
if (requestCode == OpenFileWebChromeClient.REQUEST_FILE_PICKER) {
if (mOpenFileWebChromeClient.mFilePathCallback != null) {
Uri result = intent == null || resultCode != Activity.RESULT_OK ? null
: intent.getData();
if (result != null) {
String path = MediaUtility.getPath(getApplicationContext(),
result);
Uri uri = Uri.fromFile(new File(path));
mOpenFileWebChromeClient.mFilePathCallback
.onReceiveValue(uri);
} else {
mOpenFileWebChromeClient.mFilePathCallback
.onReceiveValue(null);
}
}
if (mOpenFileWebChromeClient.mFilePathCallbacks != null) {
Uri result = intent == null || resultCode != Activity.RESULT_OK ? null
: intent.getData();
if (result != null) {
String path = MediaUtility.getPath(getApplicationContext(),
result);
Uri uri = Uri.fromFile(new File(path));
mOpenFileWebChromeClient.mFilePathCallbacks
.onReceiveValue(new Uri[] { uri });
} else {
mOpenFileWebChromeClient.mFilePathCallbacks
.onReceiveValue(null);
}
}

mOpenFileWebChromeClient.mFilePathCallback = null;
mOpenFileWebChromeClient.mFilePathCallbacks = null;
}
}

public class MediaUtility {
/**
* Get a file path from a Uri. This will get the the path for Storage Access
* Framework Documents, as well as the _data field for the MediaStore and
* other file-based ContentProviders.
*
* @param context The context.
* @param uri     The Uri to query.
* @author paulburke
*/
@TargetApi(Build.VERSION_CODES.KITKAT)
public static String getPath(final Context context, final Uri uri) {
final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;

// DocumentProvider
if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
// ExternalStorageProvider
if (isExternalStorageDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];

if ("primary".equalsIgnoreCase(type)) {
return Environment.getExternalStorageDirectory() + "/" + split[1];
}

// TODO handle non-primary volumes
}
// DownloadsProvider
else if (isDownloadsDocument(uri)) {

final String id = DocumentsContract.getDocumentId(uri);
final Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));

return getDataColumn(context, contentUri, null, null);
}
// MediaProvider
else if (isMediaDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];

Uri contentUri = null;
if ("image".equals(type)) {
contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
} else if ("video".equals(type)) {
contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
} else if ("audio".equals(type)) {
contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
}

final String selection = "_id=?";
final String[] selectionArgs = new String[]{split[1]};

return getDataColumn(context, contentUri, selection, selectionArgs);
}
}
// MediaStore (and general)
else if ("content".equalsIgnoreCase(uri.getScheme())) {
return getDataColumn(context, uri, null, null);
}
// File
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}

return null;
}

/**
* Get the value of the data column for this Uri. This is useful for
* MediaStore Uris, and other file-based ContentProviders.
*
* @param context       The context.
* @param uri           The Uri to query.
* @param selection     (Optional) Filter used in the query.
* @param selectionArgs (Optional) Selection arguments used in the query.
* @return The value of the _data column, which is typically a file path.
*/
public static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) {
Cursor cursor = null;
final String column = "_data";
final String[] projection = {column};

try {
cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);
if (cursor != null && cursor.moveToFirst()) {
final int column_index = cursor.getColumnIndexOrThrow(column);
return cursor.getString(column_index);
}
} finally {
if (cursor != null) cursor.close();
}
return null;
}

/**
* @param uri The Uri to check.
* @return Whether the Uri authority is ExternalStorageProvider.
*/
public static boolean isExternalStorageDocument(Uri uri) {
return "com.android.externalstorage.documents".equals(uri.getAuthority());
}

/**
* @param uri The Uri to check.
* @return Whether the Uri authority is DownloadsProvider.
*/
public static boolean isDownloadsDocument(Uri uri) {
return "com.android.providers.downloads.documents".equals(uri.getAuthority());
}

/**
* @param uri The Uri to check.
* @return Whether the Uri authority is MediaProvider.
*/
public static boolean isMediaDocument(Uri uri) {
return "com.android.providers.media.documents".equals(uri.getAuthority());
}
}