從相冊選相片，或者拍照選相片再裁剪是眾多app都有的功能。做法很簡單，這里我寫了一個demo實現頭像選擇。

github代碼直通車

啥也不說了，先上效果圖：

相冊選擇

拍照獲取

實現步驟：
1.彈框選擇框所用的popupwindow

    private void showPopupwindow(){
        DoubleSelectPopupWindow popupWindow = new DoubleSelectPopupWindow(this);
        popupWindow.showAtLocation(rootView, Gravity.BOTTOM,0,0);
        popupWindow.init("頭像選擇",strs);
        popupWindow.setOnSelectListener(new DoubleSelectPopupWindow.ICallIntListener() {
            @Override
            public void callBack(int pos) {
                if(pos == 0){
                    choosePicUtil.takePic(ChoosePicUtil.CODE_CAMERA_REQUEST);
                }else{
                    choosePicUtil.choosePic();
                }
            }
        });
    }

2.takepic()和choosePic()方法；分別使用MediaStore.ACTION_IMAGE_CAPTURE、MediaStore.ACTION_GET_CONTENT兩個意圖調起系統拍照和圖片選擇。

getRealFilePath(final Uri uri )可將裁剪圖片的uri轉為sd卡路徑。

/**
 * 選擇圖片或拍照工具
 */
public class ChoosePicUtil {
    private Context context;
    private Uri imageUri;
    private Uri imageCropUri;
    public static final int CODE_CAMERA_REQUEST = 0;
    public static final int CODE_CHOOSE_REQUEST = 1;
    public static final int CODE_CAMERA_CROP_REQUEST = 2;

    public ChoosePicUtil(Context context, Uri imageUri, Uri imageCropUri){
        this.context = context;
        this.imageUri = imageUri;
        this.imageCropUri = imageCropUri;
    }

    /**
     * 拍照
     * @param resultCode
     */
    public void takePic(int resultCode){
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        intent.putExtra("return-data", false);
        intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
        intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
        intent.putExtra("noFaceDetection", true);
        ((Activity)context).startActivityForResult(intent, resultCode);
    }

    /**
     * 裁剪圖片
     * @param uri
     */
    public void cropImg(Uri uri) {
        Intent intent = new Intent("com.android.camera.action.CROP");  //調用裁剪
        intent.setDataAndType(uri, "image/*");
        intent.putExtra("crop", "true");
        intent.putExtra("aspectX", 1);  //設置寬高比例為1：1
        intent.putExtra("aspectY", 1);
        intent.putExtra("outputX", 700);   //設置裁剪圖片寬高700x700
        intent.putExtra("outputY", 700);
        intent.putExtra("return-data", false);
        intent.putExtra("scale",true);
        intent.putExtra("scaleUpIfNeeded", true);   //防止出現黑邊框
        intent.putExtra(MediaStore.EXTRA_OUTPUT, imageCropUri);
        intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());  //設置輸出格式
        intent.putExtra("noFaceDetection", true);
        ((Activity)context).startActivityForResult(intent, CODE_CAMERA_CROP_REQUEST);
    }

    public void choosePic(){
        Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
        intent.addCategory(Intent.CATEGORY_OPENABLE);
        intent.setType("image/*");
        ((Activity)context).startActivityForResult(intent, CODE_CHOOSE_REQUEST);
    }

    public String getRealFilePath(final Uri uri ) {
        if ( null == uri ) return null;
        final String scheme = uri.getScheme();
        String data = null;
        if ( scheme == null )
            data = uri.getPath();
        else if ( ContentResolver.SCHEME_FILE.equals( scheme ) ) {
            data = uri.getPath();
        } else if ( ContentResolver.SCHEME_CONTENT.equals( scheme ) ) {
            Cursor cursor = context.getContentResolver().query( uri, new String[] { MediaStore.Images.ImageColumns.DATA }, null, null, null );
            if ( null != cursor ) {
                if ( cursor.moveToFirst() ) {
                    int index = cursor.getColumnIndex( MediaStore.Images.ImageColumns.DATA );
                    if ( index > -1 ) {
                        data = cursor.getString( index );
                    }
                }
                cursor.close();
            }
        }
        return data;
    }

}

3.設置選擇圖片和裁剪圖片的路徑，設置給第二步的ChoosePicUtil類。

        File file = new File(picSavePath +  "/avator.jpg");
        imageUri = Uri.fromFile(file);
        File cropFile = new File(picSavePath + "/avator_crop.jpg");
        imageCropUri = Uri.fromFile(cropFile);
        choosePicUtil = new ChoosePicUtil(this,imageUri,imageCropUri);

4.在onActivityResult方法中獲取startActivityforResult()裁剪圖片路徑的回調。回調接收的流程是：拍照或選擇圖片分別走case1，case3；都會調用cropImg()去裁剪圖片，裁剪完回調再走case2情況，從data中獲取裁剪后的uri。

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(resultCode == RESULT_OK){
            switch (requestCode){
                case ChoosePicUtil.CODE_CAMERA_REQUEST:
                    choosePicUtil.cropImg(imageUri);
                    break;
                case ChoosePicUtil.CODE_CAMERA_CROP_REQUEST:
                    Bundle extras = data.getExtras();
                    if (extras != null) {
                        //獲取bitmap
                        Bitmap bitmap = BitmapFactory.decodeFile(choosePicUtil.getRealFilePath(imageCropUri));
                        ivAvator.setImageBitmap(bitmap);
                    }
                    break;
                case ChoosePicUtil.CODE_CHOOSE_REQUEST:
                    choosePicUtil.cropImg(data.getData());
                    break;
            }
        }
    }

不過注意：Android7.0以上系統嘗試傳遞 file:// URI 會觸發 FileUriExposedException，就需要使用FileProvider來獲取。