Java 使用android内容的FileInputStream
我正在尝试从android设备上的图库访问图像，但我收到的图库图片路径始终显示此错误：Java 使用android内容的FileInputStream,java,android,Java,Android,我正在尝试从android设备上的图库访问图像，但我收到的图库图片路径始终显示此错误： java.io.FileNotFoundException: /external/images/media/949: open failed: ENOENT (No such file or directory) 这不是一个文件路径。它是从ContentProvider获取的Uri的路径部分。要在其上获取InputStream，请在ContentResolver上使用openInputStream（）。通过
java.io.FileNotFoundException: /external/images/media/949: open failed: ENOENT (No such file or directory)
这不是一个文件路径。它是从
ContentProviderUriInputStreamContentResolveropenInputStream（）活动getContentResolver（）上下文ContentResolverContentProviderUriInputStreamContentResolveropenInputStream（）活动getContentResolver（）上下文ContentResolverContentProviderUriInputStreamContentResolveropenInputStream（）活动getContentResolver（）上下文ContentResolverContentProviderUriInputStreamContentResolveropenInputStream（）活动中调用getContentResolver（）
或其他上下文中调用ContentResolver
来获取ContentResolver，只需扩展Commonware的答案即可
以下是我在一些应用程序中使用的代码示例：
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
super.onActivityResult(requestCode, resultCode, intent);
switch (requestCode) {
case PICTURE_GALLERY:
if (resultCode == RESULT_OK && intent != null) {
Uri selectedImage = intent.getData();
final String[] filePathColumn = { MediaColumns.DATA, MediaColumns.DISPLAY_NAME };
Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);
// some devices (OS versions return an URI of com.android instead of com.google.android
if (selectedImage.toString().startsWith("content://com.android.gallery3d.provider")) {
// use the com.google provider, not the com.android provider.
selectedImage = Uri.parse(selectedImage.toString().replace("com.android.gallery3d","com.google.android.gallery3d"));
}
if (cursor != null) {
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(MediaColumns.DATA);
// if it is a picasa image on newer devices with OS 3.0 and up
if (selectedImage.toString().startsWith("content://com.google.android.gallery3d")){
columnIndex = cursor.getColumnIndex(MediaColumns.DISPLAY_NAME);
if (columnIndex != -1) {
progress_bar.setVisibility(View.VISIBLE);
final Uri uriurl = selectedImage;
// Do this in a background thread, since we are fetching a large image from the web
new Thread(new Runnable() {
public void run() {
Bitmap the_image = getBitmap("image_file_name.jpg", uriurl);
}
}).start();
}
} else { // it is a regular local image file
String filePath = cursor.getString(columnIndex);
cursor.close();
Bitmap the_image = decodeFile(new File(filePath));
}
}
// If it is a picasa image on devices running OS prior to 3.0
else if (selectedImage != null && selectedImage.toString().length() > 0) {
progress_bar.setVisibility(View.VISIBLE);
final Uri uriurl = selectedImage;
// Do this in a background thread, since we are fetching a large image from the web
new Thread(new Runnable() {
public void run() {
Bitmap the_image = getBitmap("image_file_name.jpg", uriurl);
}
}).start();
}
}
break;
}
}
只是扩展了Commonware的答案
以下是我在一些应用程序中使用的代码示例：
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
super.onActivityResult(requestCode, resultCode, intent);
switch (requestCode) {
case PICTURE_GALLERY:
if (resultCode == RESULT_OK && intent != null) {
Uri selectedImage = intent.getData();
final String[] filePathColumn = { MediaColumns.DATA, MediaColumns.DISPLAY_NAME };
Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);
// some devices (OS versions return an URI of com.android instead of com.google.android
if (selectedImage.toString().startsWith("content://com.android.gallery3d.provider")) {
// use the com.google provider, not the com.android provider.
selectedImage = Uri.parse(selectedImage.toString().replace("com.android.gallery3d","com.google.android.gallery3d"));
}
if (cursor != null) {
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(MediaColumns.DATA);
// if it is a picasa image on newer devices with OS 3.0 and up
if (selectedImage.toString().startsWith("content://com.google.android.gallery3d")){
columnIndex = cursor.getColumnIndex(MediaColumns.DISPLAY_NAME);
if (columnIndex != -1) {
progress_bar.setVisibility(View.VISIBLE);
final Uri uriurl = selectedImage;
// Do this in a background thread, since we are fetching a large image from the web
new Thread(new Runnable() {
public void run() {
Bitmap the_image = getBitmap("image_file_name.jpg", uriurl);
}
}).start();
}
} else { // it is a regular local image file
String filePath = cursor.getString(columnIndex);
cursor.close();
Bitmap the_image = decodeFile(new File(filePath));
}
}
// If it is a picasa image on devices running OS prior to 3.0
else if (selectedImage != null && selectedImage.toString().length() > 0) {
progress_bar.setVisibility(View.VISIBLE);
final Uri uriurl = selectedImage;
// Do this in a background thread, since we are fetching a large image from the web
new Thread(new Runnable() {
public void run() {
Bitmap the_image = getBitmap("image_file_name.jpg", uriurl);
}
}).start();
}
}
break;
}
}
只是扩展了Commonware的答案
以下是我在一些应用程序中使用的代码示例：
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
super.onActivityResult(requestCode, resultCode, intent);
switch (requestCode) {
case PICTURE_GALLERY:
if (resultCode == RESULT_OK && intent != null) {
Uri selectedImage = intent.getData();
final String[] filePathColumn = { MediaColumns.DATA, MediaColumns.DISPLAY_NAME };
Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);
// some devices (OS versions return an URI of com.android instead of com.google.android
if (selectedImage.toString().startsWith("content://com.android.gallery3d.provider")) {
// use the com.google provider, not the com.android provider.
selectedImage = Uri.parse(selectedImage.toString().replace("com.android.gallery3d","com.google.android.gallery3d"));
}
if (cursor != null) {
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(MediaColumns.DATA);
// if it is a picasa image on newer devices with OS 3.0 and up
if (selectedImage.toString().startsWith("content://com.google.android.gallery3d")){
columnIndex = cursor.getColumnIndex(MediaColumns.DISPLAY_NAME);
if (columnIndex != -1) {
progress_bar.setVisibility(View.VISIBLE);
final Uri uriurl = selectedImage;
// Do this in a background thread, since we are fetching a large image from the web
new Thread(new Runnable() {
public void run() {
Bitmap the_image = getBitmap("image_file_name.jpg", uriurl);
}
}).start();
}
} else { // it is a regular local image file
String filePath = cursor.getString(columnIndex);
cursor.close();
Bitmap the_image = decodeFile(new File(filePath));
}
}
// If it is a picasa image on devices running OS prior to 3.0
else if (selectedImage != null && selectedImage.toString().length() > 0) {
progress_bar.setVisibility(View.VISIBLE);
final Uri uriurl = selectedImage;
// Do this in a background thread, since we are fetching a large image from the web
new Thread(new Runnable() {
public void run() {
Bitmap the_image = getBitmap("image_file_name.jpg", uriurl);
}
}).start();
}
}
break;
}
}
只是扩展了Commonware的答案
以下是我在一些应用程序中使用的代码示例：
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
super.onActivityResult(requestCode, resultCode, intent);
switch (requestCode) {
case PICTURE_GALLERY:
if (resultCode == RESULT_OK && intent != null) {
Uri selectedImage = intent.getData();
final String[] filePathColumn = { MediaColumns.DATA, MediaColumns.DISPLAY_NAME };
Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);
// some devices (OS versions return an URI of com.android instead of com.google.android
if (selectedImage.toString().startsWith("content://com.android.gallery3d.provider")) {
// use the com.google provider, not the com.android provider.
selectedImage = Uri.parse(selectedImage.toString().replace("com.android.gallery3d","com.google.android.gallery3d"));
}
if (cursor != null) {
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(MediaColumns.DATA);
// if it is a picasa image on newer devices with OS 3.0 and up
if (selectedImage.toString().startsWith("content://com.google.android.gallery3d")){
columnIndex = cursor.getColumnIndex(MediaColumns.DISPLAY_NAME);
if (columnIndex != -1) {
progress_bar.setVisibility(View.VISIBLE);
final Uri uriurl = selectedImage;
// Do this in a background thread, since we are fetching a large image from the web
new Thread(new Runnable() {
public void run() {
Bitmap the_image = getBitmap("image_file_name.jpg", uriurl);
}
}).start();
}
} else { // it is a regular local image file
String filePath = cursor.getString(columnIndex);
cursor.close();
Bitmap the_image = decodeFile(new File(filePath));
}
}
// If it is a picasa image on devices running OS prior to 3.0
else if (selectedImage != null && selectedImage.toString().length() > 0) {
progress_bar.setVisibility(View.VISIBLE);
final Uri uriurl = selectedImage;
// Do this in a background thread, since we are fetching a large image from the web
new Thread(new Runnable() {
public void run() {
Bitmap the_image = getBitmap("image_file_name.jpg", uriurl);
}
}).start();
}
}
break;
}
}