Question

我正在开发一个关于大学应用程序的实习项目，在运行应用程序的这一部分时突然接近。这是我可以将照片上传到图库的部分。我没有收到任何错误，但这里 startActivityForResult(pickImage,REQ);它说像“startActivityForResult(android.content.Intent, int)”作为警告被弃用。

private String category;
private final int REQ= 1;
private Bitmap bitmap;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_upload_image);
    selectImage = findViewById(R.id.addGalleryImage);
    imageCategory = findViewById(R.id.image_category);
    uploadImage = findViewById(R.id.uploadImageBtn);
    galleryImageView = findViewById(R.id.galleryImageView);

    String[] items = new String[]{"Select Category", "Convovation", "INdependence Day","Other Events"};
    imageCategory.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_spinner_dropdown_item, items));


    imageCategory.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            category = imageCategory.getSelectedItem().toString();
        }
    });
    selectImage.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

        }
    });
}
private void openGallery(){
    Intent pickImage = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
    startActivityForResult(pickImage,REQ);
}



@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == REQ && resultCode == RESULT_OK) {
        Uri uri = data.getData();
        try {
            bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), uri);
        } catch (IOException e) {
            e.printStackTrace();
        }
        galleryImageView.setImageBitmap(bitmap);
    }
}

}

Answer 1

如果您想从设备中选取图像，请使用较新的 startActiityForResult() 替代方法，它是 - ActivityResultLauncher

只需按照以下步骤操作：-

首先像这样创建 ActivityResultLauncher :

 ActivityResultLauncher<String> mGetContent = registerForActivityResult(new 
 GetContent(),
     new ActivityResultCallback<Uri>() {
     @Override
     public void onActivityResult(Uri uri) {
         // Handle the returned Uri
     }
 });

然后，单击按钮或根据需要启动系统图像选择器。

 @Override
 public void onCreate(@Nullable savedInstanceState: Bundle) {

 Button selectButton = findViewById(R.id.select_button);

 selectButton.setOnClickListener(new OnClickListener() {
 @Override
 public void onClick(View view) {
     // Pass in the mime type you'd like to allow the user to select
     // as the input
     mGetContent.launch("image/*");
     }
 });
}

如您所见，您没有在任何地方看到 REQUEST_CODE。因此，使用 ActivityResultLauncher，您不必担心检查不同任务的不同请求代码。如果一切正常，ActivityResultLauncher 会为您提供最终结果。

您可以在此处找到更多相关信息：- https://developer.android.com/training/basics/intents/result

'startActivityForResult(android.content.Intent, int)' 已弃用

1 个答案: