Camera Intent,FileUriExposedException,在存储中保存图像并检索图像位图和文件路径
Camera Intent, FileUriExposedException, saving image in storage and retrieving the image bitmap and file path
在牛轧糖以下的 android 设备上,我可以毫无问题地将图像保存在设备的外部存储器中,然后存储文件路径并使用 Picasso 显示图像。
但是,在 Nougat 设备上进行测试时,每当我启动相机意图时,我都会收到 FileUriExposedException。
我在manifest中添加了fileprovider,还添加了一个filepaths.xml
Manifest.xml:
<provider
android:authorities="${applicationId}.fileprovider"
android:exported="false"
android:grantUriPermissions="true"
android:name="android.support.v4.content.FileProvider">
<meta-data android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/filepaths" />
</provider>
filepaths.xml:
<paths>
<external-path name="mediaimages" path="." />
</paths>
这是我的代码
MainActivity.java
Intent takePicture = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
String authorities = getPackageName() + ".fileprovider";
File image = getTempFile(AddListingPage2Activity.this);
try {
image.createNewFile(); //Getting ignore warning
} catch (IOException e) {
e.printStackTrace();
}
Uri imageUri = FileProvider.getUriForFile(AddListingPage2Activity.this, authorities, image);
mImageFileUri = imageUri;
takePicture.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
startActivityForResult(takePicture, CAMERA_REQ);
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case CAMERA_REQ:
if (resultCode == RESULT_OK) {
//How to get bitmap and create file to store in storage
Bitmap bitmap = null;
bitmap = BitmapFactory.decodeFile(mImageFileUri.getPath()); //returns null
try {
bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), mImageFileUri); //returns null as well
} catch (IOException e) {
e.printStackTrace();
}
}
break;
}
private File getTempFile(Context context) {
final File path = new File(Environment.getExternalStorageDirectory(), context.getPackageName());
if (!path.exists()) {
path.mkdir(); //Getting ignored warning
}
return new File(path, "myImage.jpg");
}
如何在 OnActivityResult 中保存图像文件并检索文件路径?
我弄明白为什么相机应用无法保存图像了。该应用程序应该将图像保存在 ./packagename/myImage.jpg 中,但 myImage.jpg 被创建为目录。在我删除文件夹并尝试 运行 应用程序后,我终于可以保存图像了。
你应该更新 filepaths.xml
<paths>
<external-path
name="external_files"
path="." />
</paths>
和Mainifest.xml文件
<provider
android:name="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/filepaths" />
</provider>
在牛轧糖以下的 android 设备上,我可以毫无问题地将图像保存在设备的外部存储器中,然后存储文件路径并使用 Picasso 显示图像。
但是,在 Nougat 设备上进行测试时,每当我启动相机意图时,我都会收到 FileUriExposedException。
我在manifest中添加了fileprovider,还添加了一个filepaths.xml
Manifest.xml:
<provider
android:authorities="${applicationId}.fileprovider"
android:exported="false"
android:grantUriPermissions="true"
android:name="android.support.v4.content.FileProvider">
<meta-data android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/filepaths" />
</provider>
filepaths.xml:
<paths>
<external-path name="mediaimages" path="." />
</paths>
这是我的代码
MainActivity.java
Intent takePicture = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
String authorities = getPackageName() + ".fileprovider";
File image = getTempFile(AddListingPage2Activity.this);
try {
image.createNewFile(); //Getting ignore warning
} catch (IOException e) {
e.printStackTrace();
}
Uri imageUri = FileProvider.getUriForFile(AddListingPage2Activity.this, authorities, image);
mImageFileUri = imageUri;
takePicture.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
startActivityForResult(takePicture, CAMERA_REQ);
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case CAMERA_REQ:
if (resultCode == RESULT_OK) {
//How to get bitmap and create file to store in storage
Bitmap bitmap = null;
bitmap = BitmapFactory.decodeFile(mImageFileUri.getPath()); //returns null
try {
bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), mImageFileUri); //returns null as well
} catch (IOException e) {
e.printStackTrace();
}
}
break;
}
private File getTempFile(Context context) {
final File path = new File(Environment.getExternalStorageDirectory(), context.getPackageName());
if (!path.exists()) {
path.mkdir(); //Getting ignored warning
}
return new File(path, "myImage.jpg");
}
如何在 OnActivityResult 中保存图像文件并检索文件路径?
我弄明白为什么相机应用无法保存图像了。该应用程序应该将图像保存在 ./packagename/myImage.jpg 中,但 myImage.jpg 被创建为目录。在我删除文件夹并尝试 运行 应用程序后,我终于可以保存图像了。
你应该更新 filepaths.xml
<paths>
<external-path
name="external_files"
path="." />
</paths>
和Mainifest.xml文件
<provider
android:name="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/filepaths" />
</provider>