问题
Hello friends i want to browse my gallery image in my so below is my code
see above image i click on Photos application .
Button Click
protected void importImage()
{
Intent intent = new Intent(
Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
intent.setType("image/*");
startActivityForResult(
Intent.createChooser(intent, "Select File"),
currentRequestCode);
}
onActivityResult
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data)
{
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == currentRequestCode)
{
if (data!=null) {
openGalleryImage(data);
saveImage(uri_outputFileUri.getPath());
}
}
else if (requestCode == REQUEST_CAMERA) {
Bitmap thumbnail = null;
try {
thumbnail = (Bitmap) data.getExtras().get("data");
} catch (Exception e) {
// TODO: handle exception
}
try {
if(thumbnail != null){
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
thumbnail.compress(Bitmap.CompressFormat.PNG, 100, bytes);
File file = new File(Environment.getExternalStorageDirectory()
+ File.separator + Long.toString(System.currentTimeMillis())+".png");
file.createNewFile();
FileOutputStream fo = new FileOutputStream(file);
fo.write(bytes.toByteArray());
fo.close();
mStringGetImagePath = String.valueOf(file);
saveImage(mStringGetImagePath);
System.out.println("mStringGetImagePath "+mStringGetImagePath);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
openGalleryImage
private void openGalleryImage(Intent data)
{
Uri selectedimg = data.getData();
Uri uriselectedimage=data.getData();
mString=uriselectedimage.getPath();
try
{
mInputStream=getActivity().getContentResolver().openInputStream(selectedimg);
}
catch (FileNotFoundException e)
{
e.printStackTrace();
}
String[] path = { MediaStore.Images.Media.DATA };
Cursor c = getActivity().getContentResolver().query(selectedimg, path, null, null,null);
c.moveToFirst();
int columnIndex = c.getColumnIndex(path[0]);
selectedimage_paths=c.getString(columnIndex);
uri_outputFileUri= Uri.parse(selectedimage_paths);
c.close();
}
When i run above code it gave me null pointer error at line this uri_outputFileUri= Uri.parse(selectedimage_paths);
this code is runable to all 4.0 ,4.1,4.2,4.3,4.4 device only problem in 5.0and 5.1 device
回答1:
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == YOUR_REQUEST_CODE && resultCode == RESULT_OK
&& data != null && data.getData() != null) {
Uri selectedImageUri = data.getData();
String[] projection = new String[] { MediaStore.MediaColumns.DATA };
Cursor cursor = getContentResolver().query(selectedImageUri,
projection, null, null, null);
if (cursor.moveToFirst()) {
String path = cursor.getString(0);
System.out.println("MainActivity.onActivityResult() : " + path);
}
System.out.println(selectedImageUri.toString());
// MEDIA GALLERY
String selectedImagePath = ImgPath.getPath(MainActivity.this,
selectedImageUri);
if (selectedImagePath != null && !selectedImagePath.equals("")) {
path = selectedImagePath;
} else {
AlertDialog alDailog = new AlertDialog.Builder(
MainActivity.this).setTitle("Image Upload")
.setMessage("Please Select Valid Image").create();
alDailog.show();
return;
}
loadFromPath(selectedImagePath);
}
}
private void loadFromPath(String selectedImagePath) {
try {
if (selectedImagePath == null) {
return;
}
Bitmap bitmap = BitmapFactory.decodeFile(selectedImagePath);
imageView.setImageBitmap(bitmap);
} catch (Exception e) {
e.printStackTrace();
}
}
public class ImgPath {
/**
* Method for return file path of Gallery image
*
* @param context
* @param uri
* @return path of the selected image file from gallery
*/
public static String getPath(final Context context, final Uri uri) {
// check here to KITKAT or new version
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];
}
}
// 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;
}
/**
* 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 index = cursor.getColumnIndexOrThrow(column);
return cursor.getString(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());
}
/**
* @param uri
* The Uri to check.
* @return Whether the Uri authority is Google Photos.
*/
public static boolean isGooglePhotosUri(Uri uri) {
return "com.google.android.apps.photos.content".equals(uri
.getAuthority());
}
}
来源：https://stackoverflow.com/questions/31113514/image-browse-not-working-in-5-1-android-device