Android 点击button保存imageview图片，使用ActivityResultLauncher

最新推荐文章于 2024-10-17 11:36:47 发布

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最新推荐文章于 2024-10-17 11:36:47 发布

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文章标签： android

本文链接：https://blog.youkuaiyun.com/Houdr243/article/details/136333881

版权

本文详细介绍了如何在Android中使用ActivityResultLauncher处理按钮点击事件，获取READ_MEDIA_IMAGES权限，以及将图片保存到相册的步骤。包括权限检查、ActivityResultLauncher的注册和实际的图片保存方法。

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Android 使用ActivityResultLauncher点击button保存imageview图片

获取权限
button实现
权限检查
ActivityResultLauncher启动保存图片
保存图片实现

获取权限

<uses-permission android:name="android.permission.READ_MEDIA_IMAGES"/>

button实现

private ActivityResultLauncher<String> saveImageLauncher;
private Bitmap imageBitmap;


@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_home, container, false);
        imageView = view.findViewById(R.id.image_home);
        Button saveImageButton = view.findViewById(R.id.btn_home_save);


		saveImageButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
                    requestSaveImageStoragePermission();
                }
            }
        });

权限检查

    @RequiresApi(api = Build.VERSION_CODES.TIRAMISU)
    private void requestSaveImageStoragePermission() {
        if (ActivityCompat.checkSelfPermission(requireContext(), Manifest.permission.READ_MEDIA_IMAGES) != PackageManager.PERMISSION_GRANTED) {
            saveImageLauncher.launch(Manifest.permission.READ_MEDIA_IMAGES);
        } else {
            saveImageToGallery();
        }
    }

ActivityResultLauncher启动保存图片

        // 保存图片
        saveImageLauncher = registerForActivityResult(new ActivityResultContracts.RequestPermission(), isGranted -> {
            if (isGranted) {
                saveImageToGallery();
            } else {
                Toast.makeText(getActivity(), "Permission denied", Toast.LENGTH_SHORT).show();
            }
        });

保存图片实现

private void saveImageToGallery() {
        // 假设你已经有了Bitmap对象，这里命名为imageBitmap
        // 获取ImageView中的Bitmap
        Bitmap imageBitmap = ((BitmapDrawable) imageView.getDrawable()).getBitmap();


        // 根据实际情况获取Bitmap
        ContentResolver resolver = requireContext().getContentResolver();
        ContentValues contentValues = new ContentValues();
        contentValues.put(MediaStore.Images.Media.DISPLAY_NAME, "Image.jpg");
        contentValues.put(MediaStore.Images.Media.MIME_TYPE, "image/jpeg");
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
            contentValues.put(MediaStore.Images.Media.RELATIVE_PATH, Environment.DIRECTORY_PICTURES);
        }
        Uri imageUri = resolver.insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, contentValues);

        try {
            if (imageUri != null) {
                OutputStream outputStream = resolver.openOutputStream(imageUri);
                if (outputStream != null) {
                    imageBitmap.compress(Bitmap.CompressFormat.JPEG, 100, outputStream);
                    outputStream.close();
                }
                // 通知图库更新
                requireActivity().sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, imageUri));
                Toast.makeText(getActivity(), "Image saved to gallery", Toast.LENGTH_SHORT).show();
            }
        } catch (Exception e) {
            e.printStackTrace();
            Toast.makeText(getActivity(), "Failed to save image", Toast.LENGTH_SHORT).show();
        }
    }

如果是要保存网络图片或是其他路径图片，需要替换这个imageBitmap

Bitmap imageBitmap = ((BitmapDrawable) imageView.getDrawable()).getBitmap();