在系统相机中拍照，获取照片文件的路径，完整代码

以下是一个获取相机拍摄照片路径的完整代码示例，你可以在你的Android应用程序中使用它：

public class MainActivity extends AppCompatActivity {

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

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button takePictureButton = findViewById(R.id.button_image);
        takePictureButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                dispatchTakePictureIntent();
            }
        });
    }

    private void dispatchTakePictureIntent() {
        Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        // Ensure that there's a camera activity to handle the intent
        if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
            // Create the File where the photo should go
            File photoFile = null;
            try {
                photoFile = createImageFile();
            } catch (IOException ex) {
                // Error occurred while creating the File
                ex.printStackTrace();
            }
            // Continue only if the File was successfully created
            if (photoFile != null) {
                Uri photoURI = FileProvider.getUriForFile(this,
                        "com.example.android.fileprovider",
                        photoFile);
                takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
                startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
            }
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
            // Photo captured and saved to fileUri specified in the Intent
            Toast.makeText(this, "Image saved to:\n" + currentPhotoPath, Toast.LENGTH_LONG).show();
        }
    }

    private File createImageFile() throws IOException {
        // Create an image file name
        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 */
        );

        // Save a file: path for use with ACTION_VIEW intents
        currentPhotoPath = image.getAbsolutePath();
        return image;
    }
}

上述代码中，我们使用了系统相机应用程序拍摄照片，并将其保存到文件中。在 `createImageFile()` 方法中，我们创建了一个文件名，使用 `File.createTempFile()` 方法创建了一个临时文件，并将其路径存储在 `currentPhotoPath` 变量中。然后，在 `dispatchTakePictureIntent()` 方法中，我们使用 `FileProvider` 来生成一个 `content://` URI，以便在 Android 7.0 及更高版本的设备上共享文件。最后，在 `onActivityResult()` 方法中，我们可以使用 `currentPhotoPath` 变量来获取拍摄的图片文件的路径。