实现Android拍照后获取图片的URI
1. 整体流程
首先让我们来看一下整个流程的步骤:
sequenceDiagram
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2. 每一步的实现
步骤一:添加权限
在AndroidManifest.xml文件中添加相机权限:
```xml
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
### 步骤二:创建FileProvider
在AndroidManifest.xml文件中添加FileProvider:
```markdown
```xml
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="com.example.yourapp.fileprovider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_paths" />
</provider>
### 步骤三:创建file_paths.xml
在res/xml/目录下创建file_paths.xml文件:
```markdown
```xml
<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="
<external-path name="my_images" path="Android/data/com.example.yourapp/files/Pictures" />
</paths>
### 步骤四:启动相机并拍照
在Activity中启动相机并拍照,将照片保存到指定路径:
```java
```java
private static final int REQUEST_IMAGE_CAPTURE = 1;
private String currentPhotoPath;
private void dispatchTakePictureIntent() {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
File photoFile = null;
try {
photoFile = createImageFile();
} catch (IOException ex) {
// Error occurred while creating the File
}
if (photoFile != null) {
Uri photoURI = FileProvider.getUriForFile(this,
"com.example.yourapp.fileprovider",
photoFile);
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
}
}
}
private File createImageFile() throws IOException {
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "JPEG_" + timeStamp + "_";
File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
File image = File.createTempFile(
imageFileName, /* prefix */
".jpg", /* suffix */
storageDir /* directory */
);
currentPhotoPath = image.getAbsolutePath();
return image;
}
### 步骤五:获取照片的URI
在onActivityResult方法中获取拍照后的照片URI:
```java
```java
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
Uri photoUri = Uri.parse(currentPhotoPath);
// 使用photoUri进行后续操作
}
}
## 结尾
通过以上步骤,你可以成功实现在Android应用中拍照后获取照片的URI。希望这篇文章对你有所帮助,如果有任何疑问欢迎继续向我提问。加油,小白!你一定可以做得很好!