我正在尝试从相机中单击图像并显示到imageview但是onactivityresult URI返回null。 BUt下面的代码在JellyBean上运行正常，ICS具有裁剪功能。
致电意图
Intent pickIntent = new Intent();
pickIntent.setType("image/*");
pickIntent.setAction(Intent.ACTION_GET_CONTENT);
pickIntent.putExtra(MediaStore.EXTRA_SCREEN_ORIENTATION, ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
Intent captureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
// we will handle the returned data in onActivityResult
String pickTitle = "Select or take a new Picture";
// startActivityForResult(captureIntent, 1);
Intent chooserIntent = Intent.createChooser(pickIntent, pickTitle);
chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, new Intent[]
{ captureIntent });
startActivityForResult(chooserIntent, GlobalVariables.GALLERY_MODE);
onActivityResult
@SuppressLint("NewApi")
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
try
{
if (resultCode == RESULT_OK)
{
// user is returning from capturing an image using the camera
if (requestCode == GlobalVariables.GALLERY_MODE)
{
// get the Uri for the captured image
picUri = data.getData();
System.out.println("picUri ======= => "+picUri);
boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
if(isKitKat)
{
System.out.println(new GraphicsUtil().getPath(RegistrationActivity.this, picUri));
String filePath = new GraphicsUtil().getPath(RegistrationActivity.this, picUri);
System.out.println("filepath => "+filePath);
bitmapPreview = null;
bitmapPreview = BitmapFactory.decodeFile(filePath);
System.out.println("bitmapPreview => "+bitmapPreview );
imageViewUser.setImageBitmap(new GraphicsUtil().getCircleBitmap(GraphicsUtil.decodeSampledBitmapFromResource(filePath,
120, 120)));
}
else
{
performCrop(picUri, PIC_CROP, RegistrationActivity.this);
}
}
// user is returning from cropping the image
else if (requestCode == PIC_CROP)
{
String filePath = new File (Environment.getExternalStorageDirectory() + "/temporary_holder.jpg").getAbsolutePath();
bitmapPreview = null;
bitmapPreview = BitmapFactory.decodeFile(filePath);
imageViewUser.setImageBitmap(new GraphicsUtil().getCircleBitmap(GraphicsUtil.decodeSampledBitmapFromResource(filePath,
120, 120)));
// imageViewUser.setImageBitmap(new
// GraphicsUtil().getCircleBitmap(bitmapPreview));
File f = new File(Environment.getExternalStorageDirectory() + "/temporary_holder.jpg");
if (f.exists())
{
f.delete();
}
}
}
}
catch (Exception e)
{
// TODO: handle exception
e.printStackTrace();
}
}
GraphicsUtil.java
public class GraphicsUtil
{
/*
* Draw image in circular shape Note: change the pixel size if you want
* image small or large
*/
public Bitmap getCircleBitmap(Bitmap bitmap)
{
Bitmap output;
Canvas canvas = null;
final int color = 0xffff0000;
final Paint paint = new Paint();
Rect rect = null;
if (bitmap.getHeight() > 501)
{
output = Bitmap.createBitmap(500, 500, Bitmap.Config.ARGB_8888);
canvas = new Canvas(output);
rect = new Rect(0, 0, 500, 500);
}
else
{
//System.out.println("output else =======");
bitmap = Bitmap.createScaledBitmap(bitmap, 500, 500, false);
output = Bitmap.createBitmap(500, 500, Bitmap.Config.ARGB_8888);
canvas = new Canvas(output);
rect = new Rect(0, 0, 500, 500);
}
final RectF rectF = new RectF(rect);
paint.setAntiAlias(true);
paint.setDither(true);
paint.setFilterBitmap(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
canvas.drawOval(rectF, paint);
paint.setColor(Color.BLUE);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth((float) 1);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return output;
}
public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight)
{
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth)
{
// Calculate ratios of height and width to requested height and
// width
final int heightRatio = Math.round((float) height / (float) reqHeight);
final int widthRatio = Math.round((float) width / (float) reqWidth);
// Choose the smallest ratio as inSampleSize value, this will
// guarantee
// a final image with both dimensions larger than or equal to the
// requested height and width.
inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
}
return inSampleSize;
}
public static Bitmap decodeSampledBitmapFromResource(String path, int reqWidth, int reqHeight)
{
// First decode with inJustDecodeBounds=true to check dimensions
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(path, options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
return BitmapFactory.decodeFile(path, options);
}
@SuppressLint("NewApi")
public 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 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 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 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 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 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 boolean isGooglePhotosUri(Uri uri) {
return "com.google.android.apps.photos.content".equals(uri.getAuthority());
}
}
单击图像时输出logcat并在android 4.4.2 os上选择图像： -
05-08 17:25:55.697: I/System.out(20894): picUri ======= => null
05-08 17:25:55.698: W/System.err(20894): java.lang.NullPointerException
05-08 17:25:55.711: W/System.err(20894): at android.provider.DocumentsContract.isDocumentUri(DocumentsContract.java:587)
05-08 17:25:55.712: W/System.err(20894): at com.asiaelites.utils.GraphicsUtil.getPath(GraphicsUtil.java:119)
05-08 17:25:55.712: W/System.err(20894): at com.asiaelites.RegistrationActivity.onActivityResult(RegistrationActivity.java:489)
05-08 17:25:55.712: W/System.err(20894): at android.app.Activity.dispatchActivityResult(Activity.java:5446)
05-08 17:25:55.712: W/System.err(20894): at android.app.ActivityThread.deliverResults(ActivityThread.java:3442)
05-08 17:25:55.712: W/System.err(20894): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2802)
05-08 17:25:55.712: W/System.err(20894): at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2859)
05-08 17:25:55.712: W/System.err(20894): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2274)
05-08 17:25:55.712: W/System.err(20894): at android.app.ActivityThread.access$800(ActivityThread.java:139)
05-08 17:25:55.712: W/System.err(20894): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1210)
05-08 17:25:55.712: W/System.err(20894): at android.os.Handler.dispatchMessage(Handler.java:102)
05-08 17:25:55.712: W/System.err(20894): at android.os.Looper.loop(Looper.java:136)
05-08 17:25:55.712: W/System.err(20894): at android.app.ActivityThread.main(ActivityThread.java:5102)
05-08 17:25:55.712: W/System.err(20894): at java.lang.reflect.Method.invokeNative(Native Method)
05-08 17:25:55.713: W/System.err(20894): at java.lang.reflect.Method.invoke(Method.java:515)
05-08 17:25:55.713: W/System.err(20894): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
05-08 17:25:55.713: W/System.err(20894): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
05-08 17:25:55.713: W/System.err(20894): at dalvik.system.NativeStart.main(Native Method)
请点击以下链接： -
Android Gallery on KitKat returns different Uri for Intent.ACTION_GET_CONTENT
答案 0 :(得分：5)
Kitkat
public class YourActivity extends Activity{
private static final int SELECT_PICTURE = 1;
private String selectedImagePath;
private ImageView imageView;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.browsepicture);
imageView = (ImageView)findViewById(R.id.imageView1);
((Button) findViewById(R.id.button1))
.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent,
"Select Picture"), SELECT_PICTURE);
}
});
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK) {
if (requestCode == SELECT_PICTURE) {
Uri selectedImageUri = data.getData();
if (Build.VERSION.SDK_INT < 19) {
selectedImagePath = getPath(selectedImageUri);
Bitmap bitmap = BitmapFactory.decodeFile(selectedImagePath);
imageView.setImageBitmap(bitmap);
}
else {
ParcelFileDescriptor parcelFileDescriptor;
try {
parcelFileDescriptor = getContentResolver().openFileDescriptor(selectedImageUri, "r");
FileDescriptor fileDescriptor = parcelFileDescriptor.getFileDescriptor();
Bitmap image = BitmapFactory.decodeFileDescriptor(fileDescriptor);
parcelFileDescriptor.close();
imageView.setImageBitmap(image);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
public String getPath(Uri uri) {
if( uri == null ) {
return null;
}
String[] projection = { MediaStore.Images.Media.DATA };
Cursor cursor = managedQuery(uri, projection, null, null, null);
if( cursor != null ){
int column_index = cursor
.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
return uri.getPath();
}
}
For Cropping image
private void cropImage() {
// Use existing crop activity.
Intent intent = new Intent("com.android.camera.action.CROP");
intent.setDataAndType(capturedImageUri, IMAGE_UNSPECIFIED);
// Specify image size
intent.putExtra("outputX", IMAGE_DIMENSION);
intent.putExtra("outputY", IMAGE_DIMENSION);
// Specify aspect ratio, 1:1
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
intent.putExtra("scale", true);
intent.putExtra("return-data", true);
// REQUEST_CODE_CROP_PHOTO is an integer tag you defined to
// identify the activity in onActivityResult() when it returns
startActivityForResult(intent, REQ_CODE_CROP_PHOTO);
}
答案 1 :(得分：2)
我希望你能得到解决方案，但这适合那些仍在寻找解决方案的人。
在onActivityResult
中使用这行代码Uri imageUri = data.getData();
或参考此link for getting URI。
只需使用 getPath（最终上下文上下文，最终Uri uri）的代码，使用uri你将拥有返回文件路径。
@SuppressLint("NewApi")
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());
}