如何获取已捕获照片的uri? [英] How to get uri of captured photo?
问题描述
我想实现什么? 我想获取捕获图像的URI并将其保存在Firebase上. 我尝试了什么? 首先，我需要打开相机.下面是我的操作方法:
What do I want to achieve? I want to get URI of the captured image and save it on Firebase. What did I try? First of all I needed to open the camera. Below how I did it:
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
if (cameraIntent.resolveActivity(getActivity().getPackageManager()) != null)
startActivityForResult(cameraIntent, CAMERA_REQUEST_CODE);
捕获图像后，我需要获取图像的URI.下面是我的操作方法:
After capturing the image, I needed to get the URI of the image. Below how I did it:
if (resultCode == Activity.RESULT_OK) {
if (requestCode == CAMERA_REQUEST_CODE) {
if (data != null) {
if (data.getData() != null) {
Uri capturedImageUri = data.getData();
} else {
Toast.makeText(getContext(), getString(R.string.coudldnt_get_photo), Toast.LENGTH_SHORT).show();
}
} else {
Toast.makeText(getContext(), getString(R.string.coudldnt_get_photo), Toast.LENGTH_SHORT).show();
}
一切都很好.但仅在某些设备上.我想它只能在超过21种设备的API级别上工作.在其他设备中，getData()返回null.
So everything was OK. But only on some devices. I suppose that it works only on API level more than 21 devices. In other devices , getData() returns null.
那么，接下来我要做什么? 我发现可以通过以下代码获取图像的位图:
So, what I have done next? I found that I can get Bitmap of the image through following code:
Bitmap bitmap = (Bitmap)data.getExtras().get("data") ;
所以，我有图像的位图.我需要获取此图像的URI.下面是我的操作方法:
So, I have a bitmap of the image. And I needed to get the URI of this image. Below how I did it:
public Uri getImageUri(Context inContext, Bitmap inImage) {
String path =
Images.Media.insertImage(inContext.getContentResolver(), inImage,
"Title", null);
return Uri.parse(path);
}
上面的代码返回了我URI，但是图像的质量确实很差.
Above code returns me URI, but the image has really bad quality.
因此，我一直在寻找解决方案.并发现正确的方法是在启动CameraActivity时创建文件并保存该文件的uri.而onActivityResult我试图获取该uri.下面是我的操作方法:
So, I kept looking for a solution. And found that the right way is to create the file when I start the CameraActivity and save the uri of that file. And onActivityResult I tried to get that uri. Below how I did it:
Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (cameraIntent.resolveActivity(getActivity().getPackageManager()) != null) {
File photoFile = null;
try {
photoFile = createImageFile();
} catch (IOException ex) {
}
if (photoFile != null) {
Uri photoUri = FileProvider.getUriForFile(getContext(), "i_dont_know_what_to_write_here", photoFile);
cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoUri);
startActivityForResult(cameraIntent, CAMERA_REQUEST_CODE);
}
}
然后我的onActivityResult变成了:
if (resultCode == Activity.RESULT_OK) {
if (requestCode == CAMERA_REQUEST_CODE) {
if (data != null) {
Uri capturedPhotoUri =
data.getParcelableExtra(MediaStore.EXTRA_OUTPUT);
} else {
Toast.makeText(getContext(),
getString(R.string.coudldnt_get_photo), Toast.LENGTH_SHORT).show();
}
以上概念需要在清单中添加一些标签:
The above concept requires to add some tags on manifest :
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="i_dont_know_what_to_write_here"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/my_paths" />
</provider>
我的xml文件是:
<?xml version="1.0" encoding="utf-8"?>
<paths>
<external-files-path name="images"/>
</paths>
上述方法无效，因为onActivityReuslt上的data为空.
The above method didn't work because data on onActivityReuslt was null.
那么，我需要做些什么才能实现自己的目标?
So, what I need to do in order to achieve my goal?
推荐答案
请按照以下步骤操作.
步骤-1:在res/xml文件夹中创建provider_paths.xml并在其中写入以下代码.
<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<external-path
name="external_files"
path="." />
</paths>
第2步:声明清单中的提供者，如下所示.
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="${applicationId}.provider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/provider_paths" />
</provider>
如果您在以下位置遇到错误:android:name ="android.support.v4.content.FileProvider" 使用:
If you are facing error at: android:name="android.support.v4.content.FileProvider" Use:
<provider
android:name="androidx.core.content.FileProvider"
android:authorities="${applicationId}.provider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/provider_paths" />
</provider>
步骤-3:按如下所示编写相机意图.
Intent m_intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
File file = new File(Environment.getExternalStorageDirectory(), "MyPhoto.jpg");
Uri uri = FileProvider.getUriForFile(this, this.getApplicationContext().getPackageName() + ".provider", file);
m_intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, uri);
startActivityForResult(m_intent, REQUEST_CAMERA_IMAGE);
步骤-4:按如下所示在onActivityResult中处理摄像机结果.
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
//TODO... onCamera Picker Result
case REQUEST_CAMERA_IMAGE:
if (resultCode == RESULT_OK) {
//File object of camera image
File file = new File(Environment.getExternalStorageDirectory(), "MyPhoto.jpg");
//Uri of camera image
Uri uri = FileProvider.getUriForFile(this, this.getApplicationContext().getPackageName() + ".provider", file);
}
break;
}
}
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