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:
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| 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()
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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:
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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; } } }
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那么,我们在裁剪的时候,应该如下调用:
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| 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); }
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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:
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| 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); }
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| android.os.FileUriExposedException: file:///storage/emulated/0/Android/data/com.yuyh.imgsel/cache/1486438962645.jpg exposed beyond app through ClipData.Item.getUri()
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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
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| <application ...>
<provider android:name="android.support.v4.content.FileProvider" android:authorities="{替换为你的包名}.provider" android:exported="false" android:grantUriPermissions="true"> <meta-data android:name="android.support.FILE_PROVIDER_PATHS" android:resource="@xml/provider_paths"/> </provider> </application>
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Step.2
在res/xml/下新建provider_paths.xml文件
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| <?xml version="1.0" encoding="utf-8"?> <paths xmlns:android="http://schemas.android.com/apk/res/android"> <external-path name="external_files" path="."/> </paths>
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Step.3
修改拍照时的参数
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| cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, FileProvider.getUriForFile(getActivity(),BuildConfig.APPLICATION_ID + ".provider", tempFile));
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搞定!