Android development calls the system to take pictures and select pictures

1. Picture selection

        Intent intent = new Intent(Intent.ACTION_PICK);
        intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*");
        startActivityForResult(intent, AVATAR_PICTURE);

2. Select image callback

  @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        switch (requestCode) {
            case AVATAR_PICTURE://Callback selected from gallery
                //filePath = data.getData().getPath();
                if (data != null) {//Not empty, indicating that it is the avatar selected by the gallery

                    Are you = data.getData ();

                    if (uri == null) return;

                    Cursor c = getContentResolver().query(uri, new String[]{MediaStore.Images.Media.DATA}, null, null, null);
                    if (c == null) return;

                    boolean moveToNext = c.moveToNext();

                    if (moveToNext) {

                        mFilePath = c.getString(0);
                    }
                    c.close();
                    //Cancel the operation, and no picture is selected
                } else {
                    return;
                }
                cropRawPhoto (Uri.fromFile (new File (mFilePath)), mIvAvatar, AVATAR_CROP);

                break;

            case AVATAR_CAMERA://Callback after taking a photo
                if (resultCode == RESULT_OK) {
                    mFilePath = mCameraPath;
                    cropRawPhoto (Uri.fromFile (new File (mFilePath)), mIvAvatar, AVATAR_CROP);

                    //update gallery
                    Uri localUri = Uri.fromFile (new File (mFilePath));

                    Intent localIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, localUri);

                    sendBroadcast (localIntent);
                  //Cancel return,
                } else if (requestCode == RESULT_CANCELED) {

                }
                break;                 

           case AVATAR_CROP://Callback after cropping
                if (data != null) {
                    Bundle extras = intent.getExtras();
                    if (extras != null)
                    Bitmap photo = extras.getParcelable("data");
                } else {
                    return;
                }
                break;

3. Call to take pictures

  Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        // Determine if the memory card is available and store the photo file
        if (StorageUtils.hasSdcard()) {
            File file = new File(Environment.getExternalStoragePublicDirectory(
                    Environment.DIRECTORY_PICTURES), System.currentTimeMillis() + ".jpg");
            mCameraPath = file.getAbsolutePath();
            Uri uri = Uri.fromFile (file);
            intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
        }
        startActivityForResult(intent, AVATAR_CAMERA);

4. Call the crop function after taking a photo

**
     * Crop the original picture
     */
    public void cropRawPhoto(Uri uri, CircleImageView ivAvatar, int CODE_RESULT_REQUEST) {

        Intent intent = new Intent("com.android.camera.action.CROP");
        intent.setDataAndType(uri, "image/*");

        // set crop
        intent.putExtra("crop", "true");

        // aspectX , aspectY : aspect ratio
        intent.putExtra("aspectX", 1);
        intent.putExtra("aspectY", 1);

        // outputX , outputY : crop image width and height
        intent.putExtra("outputX", ivAvatar.getWidth());
        intent.putExtra("outputY", ivAvatar.getHeight());
        intent.putExtra("return-data", true);

        startActivityForResult(intent, CODE_RESULT_REQUEST);
    }