当我们点击头像想要进行头像上传时，我们可以给上传头像设置一个弹框效果，用来给用户提供相册选择和拍照两种选择。
这时我们可以使用PopupWindow实现

1. 定义图片存储位置

    public void saveImage(Bitmap bitmap) {
        String state = Environment.getExternalStorageState();
        if (!state.equals(Environment.MEDIA_MOUNTED)){
            return;
        }
        FileOutputStream stream = null;
        try {
            stream = new FileOutputStream(Environment.getExternalStorageDirectory() + "/hear.jpg");
            bitmap.compress(Bitmap.CompressFormat.JPEG,100,stream);
            stream.flush();
            stream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

2. 打开相册

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

3. 打开系统相机

    private void getPicFromCreame() {
        //先初始化出相机拍完照片后的存放路径
        tempFile = new File(Environment.getExternalStorageDirectory().getPath(), System.currentTimeMillis() + ".jpg");
        //跳转到调用系统相机(跳转系统相机用到的是intent隐式意图来进行跳转)
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        //跳转前需要对当前的Android版本进行判断,因为Android6.0以上的版本需要权限
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            StrictMode.VmPolicy.Builder builder = new StrictMode.VmPolicy.Builder();
            StrictMode.setVmPolicy(builder.build());
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
                builder.detectFileUriExposure();
            }
        } else {
            //否则使用Uri.fromFile(file)方法获取Uri
            intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(tempFile));
        }
        startActivityForResult(intent, CAMEAR_REQUEST_CODE);
    }

4. 裁剪

    public void cropPhoto(Uri uri) {
        Intent intent = new Intent("com.android.camera.action.CROP");
        intent.setDataAndType(uri, "image/*");
        intent.putExtra("crop", "true");
        // aspectX aspectY 是宽高的比例
        intent.putExtra("aspectX", 1);
        intent.putExtra("aspectY", 1);
        // outputX outputY 是裁剪图片宽高
        intent.putExtra("outputX", 150);
        intent.putExtra("outputY", 150);
        intent.putExtra("return-data", true);
        startActivityForResult(intent, 3);
    }

5. 在框架上进行上传

    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent intent) {
//        super.onActivityResult(requestCode, resultCode, data);
        super.onActivityResult(requestCode, resultCode, intent);
        switch (requestCode) {
            case CAMEAR_REQUEST_CODE:
                //调用系统相机后返回
                if (resultCode == RESULT_OK) {
                    //用相机返回的照片去调用剪裁也需要对Uri进行处理
                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                        Uri contentUri = FileProvider.getUriForFile(this, "com.bw.movie", tempFile);
                        cropPhoto(contentUri);
                    } else {
                        cropPhoto(Uri.fromFile(tempFile));
                    }
                }
                break;
            case ALBUM_REQUEST_CODE:
                //调用系统相册后返回
                if (resultCode == RESULT_OK) {
                    Uri uri = intent.getData();
                    cropPhoto(uri);
                }
                break;
            case CROP_REQUEST_CODE:
                Bundle bundle = intent.getExtras();
                if (bundle != null) {
                    //在这里获得了剪裁后的Bitmap对象，可以用于上传
                    Bitmap image = bundle.getParcelable("data");
                    //设置到ImageView上
                    pic.setImageBitmap(image);
                    Log.e("TAG","Bit=="+image.toString());
                    //也可以进行一些保存、压缩等操作后上传
                    saveImage(image);
                    File file = new File(Environment.getExternalStorageDirectory() + "/hear.jpg");
                    getPresenter().headpic(file);
                }
                break;
        }
    }

总结：

• 当我们进行拍照时，有些模拟器可能会因为版本太高从而导致无法打开摄像头，这时问题出在Android7.0权限处理问题，我们可以进行权限添加，点击—>ヾ(•ω•`)o