我没有从whatsApp收到的来自uri的图片或视频获取路径。
Uri是这样的：content：//com.whatsapp.provider.media/item/16695
来自Gallery，Downloads和其他人的媒体很好。任何人都知道如何获得Path？这是我正在使用的代码：
public String getMediaPath(Context context, Uri uri) {
if (DEBUG)
Log.d(TAG + " File -",
"Authority: " + uri.getAuthority() +
", Fragment: " + uri.getFragment() +
", Port: " + uri.getPort() +
", Query: " + uri.getQuery() +
", Scheme: " + uri.getScheme() +
", Host: " + uri.getHost() +
", Segments: " + uri.getPathSegments().toString()
);
// DocumentProvider
if (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];
}
}
// 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 the remote address
if (isGooglePhotosUri(uri)) {
return uri.getLastPathSegment();
}
return getDataColumn(context, uri, null, null);
}
// File
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}
return null;
}
public String getDataColumn(Context context, Uri uri, String selection,
String[] selectionArgs) {
Cursor cursor = null;
final String[] column = { MediaStore.Images.Media.DATA };
final String[] projection = {
column[0]
};
try {
cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs,
null);
if (cursor != null && cursor.moveToFirst()) {
if (DEBUG)
DatabaseUtils.dumpCursor(cursor);
final int index = cursor.getColumnIndexOrThrow(column[0]);
return cursor.getString(index);
}
} finally {
if (cursor != null)
cursor.close();
}
return null;
}
public static boolean isExternalStorageDocument(Uri uri) {
return "com.android.externalstorage.documents".equals(uri.getAuthority());
}
public static boolean isDownloadsDocument(Uri uri) {
return "com.android.providers.downloads.documents".equals(uri.getAuthority());
}
public static boolean isMediaDocument(Uri uri) {
return "com.android.providers.media.documents".equals(uri.getAuthority());
}
public static boolean isGooglePhotosUri(Uri uri) {
return "com.google.android.apps.photos.contentprovider".equals(uri.getAuthority());
}
此日志的结果：
if (DEBUG)
Log.d(TAG + " File -",
"Authority: " + uri.getAuthority() +
", Fragment: " + uri.getFragment() +
", Port: " + uri.getPort() +
", Query: " + uri.getQuery() +
", Scheme: " + uri.getScheme() +
", Host: " + uri.getHost() +
", Segments: " + uri.getPathSegments().toString()
);
就是这样：
Authority: com.whatsapp.provider.media, Fragment: null, Port: -1, Query: null, Scheme: content, Host: com.whatsapp.provider.media, Segments: [item, 16348]
getDataColumn上的光标如下所示：
>>>>> Dumping cursor
android.content.ContentResolver$CursorWrapperInner@1fc81ac
I/System.out: 0 {
I/System.out: }
I/System.out: <<<<<
答案 0 :(得分：1)
你可以试试这个，然后你得到一个选定图像的位图，然后你就可以从设备默认图库中轻松找到它的原生路径。
Bitmap roughBitmap= null;
try {
// Works with content://, file://, or android.resource:// URIs
InputStream inputStream =
getContentResolver().openInputStream(uri);
roughBitmap= BitmapFactory.decodeStream(inputStream);
// calc exact destination size
Matrix m = new Matrix();
RectF inRect = new RectF(0, 0, roughBitmap.Width, roughBitmap.Height);
RectF outRect = new RectF(0, 0, dstWidth, dstHeight);
m.SetRectToRect(inRect, outRect, Matrix.ScaleToFit.Center);
float[] values = new float[9];
m.GetValues(values);
// resize bitmap if needed
Bitmap resizedBitmap = Bitmap.CreateScaledBitmap(roughBitmap, (int) (roughBitmap.Width * values[0]), (int) (roughBitmap.Height * values[4]), true);
string name = "IMG_" + new Java.Text.SimpleDateFormat("yyyyMMdd_HHmmss").Format(new Java.Util.Date()) + ".png";
var sdCardPath= Environment.GetExternalStoragePublicDirectory("DCIM").AbsolutePath;
Java.IO.File file = new Java.IO.File(sdCardPath);
if (!file.Exists())
{
file.Mkdir();
}
var filePath = System.IO.Path.Combine(sdCardPath, name);
} catch (FileNotFoundException e) {
// Inform the user that things have gone horribly wrong
}
答案 1 :(得分：1)
您无法从WhatsApp获取文件路径。他们现在不暴露它。你唯一能得到的是InputStream is = getContentResolver().openInputStream(Uri.parse("content://com.whatsapp.provider.media/item/16695"));
：
is使用@IBOutlet var buttons: [UIButton]!
，您可以在应用中显示WhatsApp的图片。
答案 2 :(得分：0)
如果要将照片上传到服务器，还可以将URI转换为文件，然后转换为字节。
答案 3 :(得分：0)
使用下面的代码示例将返回位图：
BitmapFactory.decodeStream(getContentResolver().openInputStream(Uri.parse("content://com.whatsapp.provider.media/item/128752")))
之后你们都知道你必须做什么。
答案 4 :(得分：0)
它适用于我打开小文本文件...我没有尝试过其他文件
protected void viewhelper(Intent intent) {
Uri a = intent.getData();
if (!a.toString().startsWith("content:")) {
return;
}
//Ok Let's do it
String content = readUri(a);
//do something with this content
}
这是readUri（Uri uri）方法
private String readUri(Uri uri) {
InputStream inputStream = null;
try {
inputStream = getContentResolver().openInputStream(uri);
if (inputStream != null) {
byte[] buffer = new byte[1024];
int result;
String content = "";
while ((result = inputStream.read(buffer)) != -1) {
content = content.concat(new String(buffer, 0, result));
}
return content;
}
} catch (IOException e) {
Log.e("receiver", "IOException when reading uri", e);
} finally {
if (inputStream != null) {
try {
inputStream.close();
} catch (IOException e) {
Log.e("receiver", "IOException when closing stream", e);
}
}
}
return null;
}
我是从此存储库https://github.com/zhutq/android-file-provider-demo/blob/master/FileReceiver/app/src/main/java/com/demo/filereceiver/MainActivity.java中获得的
我修改了一些代码以使其正常工作。
清单文件：
<activity android:name=".MainActivity">
<intent-filter >
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
<data android:mimeType="*/*" />
</intent-filter>
</activity>
您需要添加
@Override
protected void onCreate(Bundle savedInstanceState) {
/*
* Your OnCreate
*/
Intent intent = getIntent();
String action = intent.getAction();
String type = intent.getType();
//VIEW"
if (Intent.ACTION_VIEW.equals(action) && type != null) {
viewhelper(intent); // Handle text being sent
}
}
答案 5 :(得分：0)
您可以尝试使用此方法为您提供帮助。您无法直接从WhatsApp获取路径。如果需要文件路径，请先复制文件并发送新文件路径。 使用下面的代码
public static String getFilePathFromURI(Context context, Uri contentUri) {
String fileName = getFileName(contentUri);
if (!TextUtils.isEmpty(fileName)) {
File copyFile = new File(TEMP_DIR_PATH + fileName+".jpg");
copy(context, contentUri, copyFile);
return copyFile.getAbsolutePath();
}
return null;
}
public static String getFileName(Uri uri) {
if (uri == null) return null;
String fileName = null;
String path = uri.getPath();
int cut = path.lastIndexOf('/');
if (cut != -1) {
fileName = path.substring(cut + 1);
}
return fileName;
}
public static void copy(Context context, Uri srcUri, File dstFile) {
try {
InputStream inputStream = context.getContentResolver().openInputStream(srcUri);
if (inputStream == null) return;
OutputStream outputStream = new FileOutputStream(dstFile);
IOUtils.copy(inputStream, outputStream);
inputStream.close();
outputStream.close();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
然后，IOUtils类如下所示
public class IOUtils {
private static final int BUFFER_SIZE = 1024 * 2;
private IOUtils() {
// Utility class.
}
public static int copy(InputStream input, OutputStream output) throws Exception, IOException {
byte[] buffer = new byte[BUFFER_SIZE];
BufferedInputStream in = new BufferedInputStream(input, BUFFER_SIZE);
BufferedOutputStream out = new BufferedOutputStream(output, BUFFER_SIZE);
int count = 0, n = 0;
try {
while ((n = in.read(buffer, 0, BUFFER_SIZE)) != -1) {
out.write(buffer, 0, n);
count += n;
}
out.flush();
} finally {
try {
out.close();
} catch (IOException e) {
Log.e(e.getMessage(), e.toString());
}
try {
in.close();
} catch (IOException e) {
Log.e(e.getMessage(), e.toString());
}
}
return count;
}
}
答案 6 :(得分：0)
受保护的void onCreate（Bundle savedInstanceState）{ / * *您的OnCreate * / 意图意图= getIntent（）; 字符串操作= intent.getAction（）; 字符串类型= intent.getType（）;
//VIEW"
if (Intent.ACTION_VIEW.equals(action) && type != null) {viewhekper(intent);//Handle text being sent}