Android studio调用相机并保存到相册

要在Android Studio中调用相机并保存到相册，您可以遵循以下步骤：

1. 在AndroidManifest.xml文件中添加相机和写入外部存储的权限：

   <uses-permission android:name="android.permission.CAMERA" />
   <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

2. 在布局文件中添加一个按钮或其他视图来触发相机操作：

   <Button
       android:id="@+id/btn_take_picture"
       android:text="Take Picture" />

3. 在Activity中添加代码来处理相机操作：

   private static final int REQUEST_IMAGE_CAPTURE = 1;
   private String currentPhotoPath;

   // 创建保存图片的文件
   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,  /* 前缀 */
               ".jpg",         /* 后缀 */
               storageDir      /* 存储目录 */
       );
       currentPhotoPath = image.getAbsolutePath();
       return image;
   }

   // 调用相机
   private void dispatchTakePictureIntent() {
       Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
       if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
           // 创建保存图片的文件
           File photoFile = null;
           try {
               photoFile = createImageFile();
           } catch (IOException ex) {
               // 处理异常
           }
           if (photoFile != null) {
               Uri photoURI = FileProvider.getUriForFile(this,
                       "com.example.android.fileprovider",
                       photoFile);
               takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
               startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
           }
       }
   }

   // 处理拍摄结果
   @Override
   protected void onActivityResult(int requestCode, int resultCode, Intent data) {
       if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
           // 图片保存成功后，将其添加到相册中
           Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
           File f = new File(currentPhotoPath);
           Uri contentUri = Uri.fromFile(f);
           mediaScanIntent.setData(contentUri);
           this.sendBroadcast(mediaScanIntent);
       }
   }

4. 在AndroidManifest.xml文件中添加FileProvider：

   <application>
       ...
       <provider
           android:name="androidx.core.content.FileProvider"
           android:authorities="com.example.android.fileprovider"
           android:exported="false"
           android:grantUriPermissions="true">
           <meta-data
               android:name="android.support.FILE_PROVIDER_PATHS"
               android:resource="@xml/file_paths" />
       </provider>
   </application>

5. 在res/xml目录下创建file_paths.xml文件：

   <?xml version="1.0" encoding="utf-8"?>
   <paths xmlns:android="http://schemas.android.com/apk/res/android">
       <external-files-path name="my_images" path="Pictures" />
   </paths>

现在，当用户点击“Take Picture”按钮时，将启动相机应用程序，