头像的截取 包括相册和相机

或不多说 上代码
权限呢需要内存的读取权限

先写隐式启动相册相机，这里使用的是startActivityForResult

/*相册*/
Intent intent = new Intent(Intent.ACTION_PICK);
intent.setType("image/*");
startActivityForResult(intent, 500);

/*相机*/
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(path)));
startActivityForResult(intent, 1000);

接下来就是一个Activity的回调

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

        if (requestCode == 500 && resultCode == RESULT_OK) {
            Uri uri = data.getData();
            Intent intent = new Intent("com.android.camera.action.CROP");

            intent.setDataAndType(uri, "image/*");

            intent.putExtra("crop", true);
            intent.putExtra("aspectX", 1);
            intent.putExtra("aspectY", 1);
            intent.putExtra("outputX", 250);
            intent.putExtra("outputY", 250);
            intent.putExtra("return-data", true);

            startActivityForResult(intent, 200);
        }
        if (requestCode == 1000 && resultCode == RESULT_OK) {

            Intent intent = new Intent("com.android.camera.action.CROP");

            intent.setDataAndType(Uri.fromFile(new File(path)), "image/*");

            intent.putExtra("crop", true);
            intent.putExtra("aspectX", 1);
            intent.putExtra("aspectY", 1);
            intent.putExtra("outputX", 250);
            intent.putExtra("outputY", 250);
            intent.putExtra("return-data", true);

            startActivityForResult(intent, 200);
        }

        if (requestCode == 200 && resultCode == RESULT_OK) {
            Bitmap bitmap = data.getParcelableExtra("data");
            img_tou.setImageBitmap(bitmap);
        }

    }