android studio拍照保存完整图片

在Android Studio中，你可以使用CameraX库方便地处理摄像头功能，包括拍照并保存完整的图片。以下是一个简单的步骤概述：

1. **添加依赖**：首先，在你的build.gradle文件中添加CameraX的依赖：

   implementation "androidx.camera:camera-core:1.0.0"
   implementation "androidx.camera:camera-camera2:1.0.0"
   implementation "androidx.camera:camera-lifecycle:1.0.0"
   implementation "androidx.core:core-image:1.0.2"

2. **请求相机权限**：在AndroidManifest.xml中添加相机访问权限：

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

3. **创建相机实例**：

   private CameraManager cameraManager;
   private ImageCapture imageCapture;

   // 在onCreate()或合适的生命周期方法中初始化
   cameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
   try {
       String cameraId = cameraManager.getCameraIdList()[0];
       cameraManager开门openCamera(cameraId);
   } catch (IOException e) {
       e.printStackTrace();
   }

4. **设置相机预览**：

   imageCapture = new ImageCapture.Builder()
           .setTargetRotation(getWindowManager().getDefaultDisplay().getRotation())
           .build();

   try {
       cameraManager.createCaptureSession(Arrays.asList(cameraId), new CameraCaptureSession.StateCallback() {
           @Override
           public void onConfigured(CameraCaptureSession session) {
               try {
                   CaptureRequest.Builder requestBuilder = new CaptureRequest.Builder(session)
                           .addRequestFeature(CaptureRequest.CONTROL_MODE_CONTINUOUS_VIDEO);
                   capture(requestBuilder.build());
               } catch (CameraAccessException e) {
                   e.printStackTrace();
               }
           }

           @Override
           public void onConfigureFailed(CameraCaptureSession session) {
               Log.e("Camera", "Configuration failed");
           }
       }, null);
   } catch (CameraAccessException e) {
       e.printStackTrace();
   }

5. **拍摄并保存照片**：

   private void capture(CaptureRequest request) {
       imageCapture.capture(request, new ImageCapture.OnImageSavedListener() {
           @Override
           public void onImageCaptured(@NonNull ImageProxy proxy, @NonNull CancellationSignal cancellationSignal,
                                       @NonNull ImageCaptureResult result) {
               try {
                   File file = saveImage(proxy.getImageInfo());
                   // 这里处理文件保存成功的情况
               } catch (IOException e) {
                   e.printStackTrace();
               }
           }
       });
   }

   private File saveImage(ImageInfo info) throws IOException {
       File directory = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
       File outputFile = File.createTempFile("image_", ".jpg", directory);
       ImageEncodingOptions options = ImageEncodingOptions.newBuilder()
               .setFormat(ImageFormat.JPEG)
               .setQuality(100) // 调整质量，范围0-100，默认80
               .build();
       Proxyquire.writeFile(outputFile, info, options);
       return outputFile;
   }

6. **注意关闭相机**：
当不再需要时，记得关闭相机资源以释放内存：

   public void closeCamera() {
       if (cameraManager != null) {
           cameraManager.close();
       }
   }