java - 将从图库中选择的照片保存到缓存目录

Question

我编写了一个方法，该方法在我的应用程序缓存目录中创建一个目录，然后提示用户拍照或从图库中选择照片。

如果用户拍摄新照片，该照片将以 profile.jpg 的形式保存到缓存中

我正在尝试获取从图库返回照片的 Intent ，以将返回的照片作为 profile.jpg 保存在我的应用程序的缓存目录中。

我很难实现这一点。

public void selectImage(View v) {

        File newDir = new File(getExternalCacheDir(), "RecruitSwift");
        if(!newDir.isDirectory())
            newDir.mkdirs();
        else
            Toast.makeText(this, "Dir already exist", Toast.LENGTH_LONG).show();

        if(newDir.canWrite())
            imageFile = new File(newDir, "profile.jpg");
        else
            Toast.makeText(this, "Dir not writable", Toast.LENGTH_LONG).show();

        final CharSequence[] options = { "Take Photo", "Choose from Gallery","Cancel" };

        AlertDialog.Builder builder = new AlertDialog.Builder(UserProfileInterviewScreenActivity.this);
        builder.setTitle("Add Photo!");
        builder.setItems(options, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int item) {
                if (options[item].equals("Take Photo")){
                    Intent takeProfileImage = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                    if (takeProfileImage.resolveActivity(getPackageManager()) != null) {

                        Uri imageUri = Uri.fromFile(imageFile);
                        takeProfileImage.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
                        startActivityForResult(takeProfileImage, 1);
                    }
                }
                else if (options[item].equals("Choose from Gallery")){
                    Intent takeProfileImage = new   Intent(Intent.ACTION_PICK,android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);

                    Uri selectedImage = takeProfileImage.getData();
                    imageFile = selectedImage;
                    startActivityForResult(takeProfileImage, 2);

                }
                else if (options[item].equals("Cancel")) {
                    dialog.dismiss();
                }
            }
        });
        builder.show();
    }

Answer 1

如果你想拍照或者挑选图片，你需要调用startActivityForResult，然后重写onActivityResult。下面是一些拍照的代码，大家看一下:

startActivityForResult:

Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
intent.putExtra("return-data", false);
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(AVATAR_FILE_TMP));
intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
intent.putExtra("noFaceDetection", true);
startActivityForResult(intent, CODE_TAKE_PHOTO);

然后覆盖onActivityResult:

if (resultCode == Activity.RESULT_OK) {
        if (requestCode == CODE_TAKE_PHOTO) {
            cropImage(Uri.fromFile(AVATAR_FILE_TMP));
        }
}