android - 如何从文件管理器中获取图像并将其转换为字节数组以存储在 Android 中的 sqlite 中

Question

我想将图像转换为字节数组。

我的代码是:

private Uri mImageCaptureUri;
private ImageView mImageView;

private static final int PICK_FROM_CAMERA = 1;
private static final int PICK_FROM_FILE = 2;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_image_picker_activty);
    final String[] items = new String[]{"From Camera", "From SD Card"};
    ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.select_dialog_item, items);
    AlertDialog.Builder builder = new AlertDialog.Builder(this);

    builder.setTitle("Select Image");
    builder.setAdapter(adapter, new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int item) {
            if (item == 0) {
                Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                File file = new File(Environment.getExternalStorageDirectory(),
                        "tmp_avatar_" + String.valueOf(System.currentTimeMillis()) + ".jpg");
                mImageCaptureUri = Uri.fromFile(file);

                try {
                    intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, mImageCaptureUri);
                    intent.putExtra("return-data", true);

                    startActivityForResult(intent, PICK_FROM_CAMERA);
                } catch (Exception e) {
                    e.printStackTrace();
                }

                dialog.cancel();
            } else {
                Intent intent = new Intent();

                intent.setType("image/*");
                intent.setAction(Intent.ACTION_GET_CONTENT);

                startActivityForResult(Intent.createChooser(intent, "Complete action using"), PICK_FROM_FILE);
            }
        }
    });

    final AlertDialog dialog = builder.create();

    mImageView = (ImageView) findViewById(R.id.iv_pic);

    (findViewById(R.id.btn_choose)).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            dialog.show();
        }
    });
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        Picasso.with(this).load(data.getData()).into(mImageView);

}

我不知道如何从中获取图像位图并将其转换为字节数组

我想将图像字节数组存储在 sqlite 数据库中。 提前致谢。 请帮我解决这个问题

Answer 1

第 1 步:删除 getRealPathFromURI()。

第 2 步:删除 onActivityResult() 方法的全部当前内容。

第 3 步:使用 an image-loading library ，例如 Picasso , 在修改后的 onActivityResult() 方法中将图像加载到您的 ImageView 中:

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  if (resultCode==RESULT_OK) {
    Picasso.with(this).load(data.getData()).into(mImageView);
  }
}