我试图拍照然后使用照片。这是我所做的。
我的设备是 Nexus 6p（Android 7.1.1）。
首先，我创建了一个Uri：
Uri mPicPath = UriUtil.fromFile(this, UriUtil.createTmpFileForPic());
//Uri mPicPath = UriUtil.fromFile(this, UriUtil.createFileForPic());
然后，我开始Intent：
Intent intent = ActivityUtils.getTakePicIntent(mPicPath);
if (intent.resolveActivity(getPackageManager()) != null) {
startActivityForResult(intent, RequestCode.TAKE_PIC);
}
最后，我在onActivityResult上处理了此Uri：
if (requestCode == RequestCode.TAKE_PIC) {
if (resultCode == RESULT_OK && mPicPath != null) {
Bitmap requireBitmap = BitmapFactory.decodeFile(mPicPath.getPath());
//path is like this: /Download/Android/data/{@applicationId}/files/Pictures/JPEG_20170216_173121268719051242.jpg
requireBitmap.recycle();//Here NPE was thrown.
}
}
与此同时，这里有 UriUtil：
public class UriUtil {
public static File createFileForPic() throws IOException {
String fileName = "JPEG_" + new SimpleDateFormat("yyyyMMdd_HHmmssSSS", Locale.getDefault()).format(new Date()) + ".jpg";
File storageDic = SPApplication.getInstance().getExternalFilesDir(Environment.DIRECTORY_PICTURES);
return new File(storageDic, fileName);
}
public static File createTmpFileForPic() throws IOException {
String fileName = "JPEG_" + new SimpleDateFormat("yyyyMMdd_HHmmssSSS", Locale.getDefault()).format(new Date());
File storageDic = SPApplication.getInstance().getExternalFilesDir(Environment.DIRECTORY_PICTURES);
return File.createTempFile(fileName, ".jpg", storageDic);
}
public static Uri fromFile(@NonNull Context context, @NonNull File file) {
if (context == null || file == null) {
throw new RuntimeException("context or file can't be null");
}
if (ActivityUtils.requireSDKInt(Build.VERSION_CODES.N)) {
return FileProvider.getUriForFile(context, BuildConfig.APPLICATION_ID + ".file_provider", file);
} else {
return Uri.fromFile(file);
}
}
}
和getTakePicIntent(Uri)：
public static Intent getTakePicIntent(Uri mPicPath) {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, mPicPath);
if (!ActivityUtils.requireSDKInt(Build.VERSION_CODES.KITKAT_WATCH)) {//in pre-KitKat devices, manually grant uri permission.
List<ResolveInfo> resInfoList = SPApplication.getInstance().getPackageManager().queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY);
for (ResolveInfo resolveInfo : resInfoList) {
String packageName = resolveInfo.activityInfo.packageName;
SPApplication.getInstance().grantUriPermission(packageName, mPicPath, Intent.FLAG_GRANT_WRITE_URI_PERMISSION | Intent.FLAG_GRANT_READ_URI_PERMISSION);
}
} else {
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
intent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
}
return intent;
}
和requireSDKInt：
public static boolean requireSDKInt(int sdkInt) {
return Build.VERSION.SDK_INT >= sdkInt;
}
除了 android Nougat（7.x.x）外，所有内容都在不同的Android API上起作用。甚至提供了" fileprovider"，'requientBitMap'始终返回为" null"。
读取日志后，FileNotFoundException是从BitmapFactory扔出的。就像：
BitmapFactory: Unable to decode stream: java.io.FileNotFoundException: /Download/Android/data/{@applicationId}/files/Pictures/JPEG_20170216_1744551601425984925.jpg (No such file or directory)
看来一切都很清楚，但我仍然不明白。
怎么可能？显然我创建了一个File！我该如何解决？有什么想法吗？
我尝试了您的代码。这是我的try.https：//github.com/raghunandankavi2010/samplesandroid/tree/master/master/stackoverflowtest。
请查看此博客https://commonsware.com/blog/2016/03/15/how-consume-content-uri.html
在博客中心软件中提到您不应该做new File (mPicPath.getPath())。
相反，您应该在onActivityResult
try {
InputStream ims = getContentResolver().openInputStream(mPicPath);
// just display image in imageview
imageView.setImageBitmap(BitmapFactory.decodeStream(ims));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
和xml
<external-files-path name="external_files" path="path" />
注意：这是您拥有的内容。在我的手机上，我得到了下面的URI。仅在nexus6p上测试。
content：//com.example.raghu.stackoverflowtest.fileprovider/external_files/pictures/pictures/jpeg_20170424_161429696969143693693160.jpg
更多在文件提供商https://developer.android.com/reference/android/support/v4/content/fileprovider.html
尝试此功能可能是您从中获得路径。这对我有用
@TargetApi(Build.VERSION_CODES.KITKAT)
public static String getRealPathFromURI_API19(Context context, Uri uri) {
if (HelperFunctions.isExternalStorageDocument(uri)) {
// ExternalStorageProvider
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];
}
} else if (HelperFunctions.isDownloadsDocument(uri)) {
// DownloadsProvider
final String id = DocumentsContract.getDocumentId(uri);
final Uri contentUri = ContentUris.withAppendedId(
Uri.parse("content://downloads/public_downloads"),
Long.valueOf(id));
return HelperFunctions.getDataColumn(context, contentUri, null, null);
} else if (HelperFunctions.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 HelperFunctions.getDataColumn(context, contentUri, selection,
selectionArgs);
} else if ("content".equalsIgnoreCase(uri.getScheme())) {
// Return the remote address
if (HelperFunctions.isGooglePhotosUri(uri))
return uri.getLastPathSegment();
return HelperFunctions.getDataColumn(context, uri, null, null);
}
// File
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}
return null;
}
这是我的静态功能辅助类别，用于上述。
public class HelperFunction{
/**
* @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());
}
}
它看起来很像{@applicationId}实际上应该包含应用程序的包装ID。实际上，文件夹不存在，因此不能编写或读取文件。看起来像 spapplication.getInstance（）。getExternalFilesDir（vosing.directory_pictures）;不是返回有效的路径。
牛轧糖和上一个更新正在使用此代码
要获取牛轧糖数据库的真实路径，请使用此功能，并通过onActivityResult中的数据字段中的URI，然后从路径中获取文件。
public String getPath(Uri uri) {
Cursor cursor = getContentResolver().query(uri, null, null, null, null);
cursor.moveToFirst();
String document_id = cursor.getString(0);
document_id = document_id.substring(document_id.lastIndexOf(":") + 1);
cursor.close();
cursor = getContentResolver().query(
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
null, MediaStore.Images.Media._ID + " = ? ", new String[]{document_id}, null);
cursor.moveToFirst();
String path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));
cursor.close();
return path;
}
您应该使用FileProvider。您可以参考此提案以进行所需的更改。
尝试滑行。
1。添加Glide依赖性到App/build.gradle
repositories {
mavenCentral() // jcenter() works as well because it pulls from Maven Central
}
dependencies {
compile 'com.github.bumptech.glide:glide:3.7.0'
compile 'com.android.support:support-v4:19.1.0'
}
2。使用Glide
加载图像Glide.with(context).load(new File(uri.getPath())).placeholder(R.drawable.placeholder).into(imageView);
或
Glide.load(new File(uri.getPath())) // Uri of the picture
.transform(new CircleTransform(..))
.into(imageView);