使用ActivityResultLauncher上传图片遇URI为空崩溃问题求助

问题根源 #

你的代码里有几个关键问题导致崩溃和功能失效：

• 回调里重新定义了局部变量imageUriPath，没给成员变量赋值，导致GetImageInView()调用时imageUriPath为null
• 获取Bitmap后没把它设置到ImageView上
• 还在使用已废弃的MediaStore.Images.Media.getBitmap()方法
• 上传逻辑里用的imagePath变量从未被赋值，应该用选中的图片URI
• Tag变量没初始化，Log打印会报错

修复后的完整代码 #

public class Profile extends AppCompatActivity {

    private ImageView ProfileImg;
    private final String Tag = "ProfileActivity"; // 初始化Tag
    private Uri imageUriPath; // 只保留这个URI变量即可，去掉冗余的imagePath
    private ProgressBar progressBar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_profile);
        progressBar = findViewById(R.id.progressBar);
        Button btnUpload = findViewById(R.id.btnUploadPhoto);
        Button btnLogOut = findViewById(R.id.btnLogOut);
        ProfileImg = findViewById(R.id.profile_img);

        btnLogOut.setOnClickListener(view -> {
            FirebaseAuth.getInstance().signOut();
            startActivity(new Intent(Profile.this, MainActivity.class)
                    .setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP));
            finish();
        });

        ProfileImg.setOnClickListener(view -> {
            Intent photoIntent = new Intent(Intent.ACTION_PICK);
            photoIntent.setType("image/*");
            NewStartActivityForResult.launch(photoIntent);
        });

        btnUpload.setOnClickListener(view -> {
            uploadImage();
        });
    }

    private final ActivityResultLauncher<Intent> NewStartActivityForResult = registerForActivityResult(
            new ActivityResultContracts.StartActivityForResult(), result -> {
                if (result.getResultCode() == Activity.RESULT_OK) {
                    Intent GotResults = result.getData();
                    if (GotResults == null) {
                        Log.d(Tag, "Intent data is null");
                        return;
                    }
                    // 直接给成员变量赋值，不要重新定义局部变量
                    imageUriPath = GotResults.getData();
                    GetImageInView();
                }
            });

    private void uploadImage() {
        // 先判断URI是否为空，避免崩溃
        if (imageUriPath == null) {
            Toast.makeText(this, "请先选择图片", Toast.LENGTH_SHORT).show();
            return;
        }
        FirebaseStorage.getInstance()
                .getReference("images/" + UUID.randomUUID().toString())
                .putFile(imageUriPath)
                .addOnCompleteListener(task -> {
                    if (task.isSuccessful()) {
                        Toast.makeText(Profile.this, "图片上传成功!", Toast.LENGTH_SHORT).show();
                    } else {
                        Toast.makeText(Profile.this, "上传失败：" + task.getException().getMessage(), Toast.LENGTH_SHORT).show();
                    }
                });
    }

    private void GetImageInView() {
        if (imageUriPath == null) return;
        Bitmap bitmap = null;
        try {
            // 用ImageDecoder替代已废弃的MediaStore.getBitmap
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
                ImageDecoder.Source source = ImageDecoder.createSource(getContentResolver(), imageUriPath);
                bitmap = ImageDecoder.decodeBitmap(source);
            } else {
                // 兼容Android P以下版本
                bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), imageUriPath);
            }
            // 将Bitmap设置到ImageView
            ProfileImg.setImageBitmap(bitmap);
        } catch (IOException e) {
            Log.e(Tag, "加载图片失败", e);
            Toast.makeText(this, "图片加载失败", Toast.LENGTH_SHORT).show();
        }
    }
}

关键修改说明 #

1. 变量赋值修复：去掉回调里的局部imageUriPath定义，直接给成员变量赋值，确保后续方法能拿到正确的URI
2. 废弃API替换：使用ImageDecoder替代MediaStore.getBitmap()，同时保留低版本兼容逻辑
3. UI绑定：在GetImageInView()中调用ProfileImg.setImageBitmap(bitmap)，把选中的图片显示出来
4. 空值判断：在uploadImage()里先检查URI是否为空，避免上传空值引发崩溃
5. Tag初始化：给Tag变量赋值，避免Log打印时的空指针异常

内容的提问来源于stack exchange，提问作者Pavlos Katsioulis