Why is the function of this method to specify the output address of taking pictures? The prototype of this method is

public Intent putExtra(String name, Parcelable value)

Doesn’t this mean to store data in the form of key-value pairs? Why can you specify the output address of the image?
The following is the complete code. The main purpose is to click the Button to enter the photo-taking interface, and then save the photos taken to the application-associated directory. However, during the learning process, I did not understand how to save the pictures to the uri specified by me. .

public class MainActivity extends AppCompatActivity { public static final int TAKE_PHOTO = 1; private ImageView picture; private Uri imageUri; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button takePhoto= (Button) findViewById(R.id.take_photo); picture= (ImageView) findViewById(R.id.pircture); takePhoto.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //创建File对象，用于存储拍照后的图片 File outputImage = new File(getExternalCacheDir(),"output_image.jpg"); if(outputImage.exists()) { outputImage.delete(); try { outputImage.createNewFile(); } catch (IOException e) { e.printStackTrace(); } } if (Build.VERSION.SDK_INT>=24) { imageUri = FileProvider.getUriForFile(MainActivity.this,"com.studio.cameraalbumtest.fileprovider",outputImage); } else { imageUri = Uri.fromFile(outputImage); } //启动相机程序 Intent intent=new Intent("android.media.action.IMAGE_CAPTURE"); intent.putExtra(MediaStore.EXTRA_OUTPUT,imageUri); startActivityForResult(intent,TAKE_PHOTO); } }); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { switch (requestCode) { case TAKE_PHOTO: { if(resultCode == RESULT_OK) { //将拍摄的照片显示出来 try { Bitmap bitmap= BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri)); picture.setImageBitmap(bitmap); } catch (FileNotFoundException e) { e.printStackTrace(); } } } break; } } }