http://www.jb51.net/article/104948.htm
http://blog.csdn.net/mr_orange_klj/article/details/69660225
http://blog.csdn.net/honjane/article/details/54411820
前言
Android 7.0系统发布后,拿到能升级的nexus 6P,就开始了7.0的适配。发现在Android 7.0以上,在相机拍照和图片裁剪上,可能会碰到以下一些错误:
1
2
3
4
5
6
7
|
Process: com.yuyh.imgsel, PID:
22995
// 错误1
android.os.FileUriExposedException: file:
///storage/emulated/0/Android/data/com.yuyh.imgsel/cache/1486438962645.jpg exposed beyond app through ClipData.Item.getUri()
// 错误2
android.os.FileUriExposedException: file:
///storage/emulated/0/DCIM/RxGalleryFinal/IMG_20161018180127.jpg exposed beyond app through Intent.getData()
|
主要是由于在Android 7.0以后,用了Content Uri 替换了原本的File Uri,故在targetSdkVersion=24
的时候,部分 “`Uri.fromFile()
“` 方法就不适用了。 **File Uri 与 Content Uri 的区别** - File Uri 对应的是文件本身的存储路径 - Content Uri 对应的是文件在Content Provider的路径 所以在android 7.0 以上,我们就需要将File Uri转换为 Content Uri。
具体转换方法如下:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
|
/**
* 转换 content:// uri
*
* @param imageFile
* @return
*/
public
Uri getImageContentUri(File imageFile) {
String filePath = imageFile.getAbsolutePath();
Cursor cursor = getContentResolver().query(
MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
new
String[] { MediaStore.Images.Media._ID },
MediaStore.Images.Media.DATA +
"=? "
,
new
String[] { filePath },
null
);
if
(cursor !=
null
&& cursor.moveToFirst()) {
int
id = cursor.getInt(cursor
.getColumnIndex(MediaStore.MediaColumns._ID));
Uri baseUri = Uri.parse(
"content://media/external/images/media"
);
return
Uri.withAppendedPath(baseUri,
""
+ id);
}
else
{
if
(imageFile.exists()) {
ContentValues values =
new
ContentValues();
values.put(MediaStore.Images.Media.DATA, filePath);
return
getContentResolver().insert(
MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
}
else
{
return
null
;
}
}
}
|
那么,我们在裁剪的时候,应该如下调用:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
|
private
void
crop(String imagePath) {
File file =
new
File(
"xxx.jpg"
);
cropImagePath = file.getAbsolutePath();
Intent intent =
new
Intent(
"com.android.camera.action.CROP"
);
intent.setDataAndType(getImageContentUri(
new
File(imagePath)),
"image/*"
);
intent.putExtra(
"crop"
,
"true"
);
intent.putExtra(
"aspectX"
, config.aspectX);
intent.putExtra(
"aspectY"
, config.aspectY);
intent.putExtra(
"outputX"
, config.outputX);
intent.putExtra(
"outputY"
, config.outputY);
intent.putExtra(
"scale"
,
true
);
intent.putExtra(
"return-data"
,
false
);
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(file));
intent.putExtra(
"outputFormat"
, Bitmap.CompressFormat.JPEG.toString());
intent.putExtra(
"noFaceDetection"
,
true
);
startActivityForResult(intent, IMAGE_CROP_CODE);
}
|
这样就解决了裁剪的问题,但是!!拍照的时候就会出现以下错误:
1
2
3
4
5
6
7
8
|
Intent cameraIntent =
new
Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if
(cameraIntent.resolveActivity(getActivity().getPackageManager()) !=
null
) {
tempFile =
new
File(FileUtils.createRootPath(getActivity()) +
"/"
+ System.currentTimeMillis() +
".jpg"
);
LogUtils.e(tempFile.getAbsolutePath());
FileUtils.createFile(tempFile);
cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(tempFile));
startActivityForResult(cameraIntent, REQUEST_CAMERA);
}
|
1
|
android.os.FileUriExposedException: file:
///storage/emulated/0/Android/data/com.yuyh.imgsel/cache/1486438962645.jpg exposed beyond app through ClipData.Item.getUri()
|
这是因为拍照存储的文件,也需要以Content Uri的形式,故采用以下办法解决:
Step.1
修改AndroidManifest.xml
1
2
3
4
5
6
7
8
9
10
11
12
13
|
...>
android:name=
"android.support.v4.content.FileProvider"
android:authorities=
"{替换为你的包名}.provider"
android:exported=
"false"
android:grantUriPermissions=
"true"
>
android:name=
"android.support.FILE_PROVIDER_PATHS"
android:resource=
"@xml/provider_paths"
/>
|
Step.2
在res/xml/下新建provider_paths.xml文件
1
2
3
4
|
|
Step.3
修改拍照时的参数
1
|
cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, FileProvider.getUriForFile(getActivity(),BuildConfig.APPLICATION_ID +
".provider"
, tempFile));
//Uri.fromFile(tempFile)
|
总结
好了,以上就是这篇文章的全部内容了,希望本文的内容对各位Android开发者们能带来一定的帮助,如果有疑问大家可以留言交流。
原文链接:http://blog.csdn.net/yyh352091626/article/details/54908624
xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" ...="android.support.v4.content.FileProvider" android:authorities="${applicationId}.provider" android:exported="false" android:grantUriPermissions="true"> <meta-data android:name="android.support.FILE_PROVIDER_PATHS" android:resource="@xml/provider_paths"/> provider> application> manifest>
xml version="1.0" encoding="utf-8"?> <paths xmlns:android="http://schemas.android.com/apk/res/android"> <external-path name="external_files" path="."/> paths>
name="name" path="path" />
Represents files in the
files/
subdirectory of your app's internal storage area. This subdirectory is the same as the value returned by
Context.getFilesDir()
. 代表了
Context.getFilesDir()
.
name="name" path="path" />
Represents files in the cache subdirectory of your app's internal storage area. The root path of this subdirectory is the same as the value returned by
getCacheDir()
.
name="name" path="path" />
Represents files in the root of the external storage area. The root path of this subdirectory is the same as the value returned by
Environment.getExternalStorageDirectory()
.
name="name" path="path" />
Represents files in the root of your app's external storage area. The root path of this subdirectory is the same as the value returned by
Context#getExternalFilesDir(String) Context.getExternalFilesDir(null)
.
name="name" path="path" />
Represents files in the root of your app's external cache area. The root path of this subdirectory is the same as the value returned by
Context.getExternalCacheDir()
.
Uri photoURI = Uri.fromFile(createImageFile());
变成:Uri photoURI = FileProvider.getUriForFile(context, context.getApplicationContext().getPackageName() + ".provider", createImageFile());
解决android N文件访问crash android.os.FileUriExposedException file:///storage/emulated/0/xxx
Android N对访问文件权限收回,按照Android N的要求,若要在应用间共享文件,您应发送一项 content://URI,并授予 URI 临时访问权限。
而进行此授权的最简单方式是使用 FileProvider类。
<application>
......
<provider
android:authorities="你的应用名.fileprovider"
android:name="android.support.v4.content.FileProvider"
android:grantUriPermissions="true"
android:exported="false">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/filepaths"/>
provider>
application>
<paths>
<external-path path="honjane/" name="files_path" />
paths>
其中:
files-path代表的根目录: Context.getFilesDir()
external-path代表的根目录: Environment.getExternalStorageDirectory()
cache-path代表的根目录: getCacheDir()
<external-path path="honjane/" name="files_path" />
path 代表要共享的目录
name 只是一个标示,随便取吧 自己看的懂就ok
举个栗子:通过provider获取到的uri链接
content://com.honjane.providerdemo.fileprovider/files_path/files/b7d4b092822da.pdf
name对应到链接中的files_path
path对应到链接中的 files ,当然files是在honjane/目录下
/**
* 打开文件
* 当手机中没有一个app可以打开file时会抛ActivityNotFoundException
* @param context activity
* @param file File
* @param contentType 文件类型如:文本(text/html)
*/
public static void startActionFile(Context context, File file, String contentType) throws ActivityNotFoundException {
if (context == null) {
return;
}
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.addCategory(Intent.CATEGORY_DEFAULT);
intent.setDataAndType(getUriForFile(context, file), contentType);
if (!(context instanceof Activity)) {
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
}
context.startActivity(intent);
}
/**
* 打开相机
*
* @param activity Activity
* @param file File
* @param requestCode result requestCode
*/
public static void startActionCapture(Activity activity, File file, int requestCode) {
if (activity == null) {
return;
}
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, getUriForFile(activity, file));
activity.startActivityForResult(intent, requestCode);
}
private static Uri getUriForFile(Context context, File file) {
if (context == null || file == null) {
throw new NullPointerException();
}
Uri uri;
if (Build.VERSION.SDK_INT >= 24) {
uri = FileProvider.getUriForFile(context.getApplicationContext(), "你的应用名.fileprovider", file);
} else {
uri = Uri.fromFile(file);
}
return uri;
}
同样访问相机相册都通过FileProvider.getUriForFile申请临时共享空间
已写成工具类上传到github,需要直接下载
使用方法简单,一行代码搞定
打开文件:
try {
FileUtils.startActionFile(this,path,mContentType);
}catch (ActivityNotFoundException e){
}
调用相机:
FileUtils.startActionCapture(this, file, requestCode);
java.lang.IllegalArgumentException: Failed to find configured root that contains /storage/emulated/0/xxx/xxx/file/12b31d2cab6ed.pdf
external与storage/emulated/0/对应,乍一看貌似没什么问题,path设置的是external的根路径,对应Environment.getExternalStorageDirectory(),
然而这个方法所获取的只是内置SD卡的路径,所以当选择的相册中的图片是外置SD卡的时候,就查找不到图片地址了,因此便抛出了failed to find configured root that contains的错误。
通过分析FileProvider源码发现,在xml解析到对应的标签后,会执行 buildPath() 方法来将根标签(files-path,cache-path,external-path等)对应的路径作为文件根路径,
在buildPath(),会根据一些常量判断是构建哪个目录下的path,除了上面介绍的几种path外还有个TAG_ROOT_PATH = “root-path” ,只有当不是root-path时才会去构建其他path,
官方也没介绍这个root-path,测试了一下发现对应的是DEVICE_ROOT指向的整个存储的根路径,这个bug就修复了
修改filepaths文件:
<paths>
<root-path name="honjane" path="" />
paths>
代码下载:https://github.com/honjane/fileProviderDemo