Android Studio：获取图库选中图片名称及头像持久化异常修复

我开发的Android应用支持Facebook登录，登录后跳转至用户资料页，加载用户的Facebook头像、姓名与邮箱，头像URL存储于SQLite数据库中。应用设置了按钮，可将头像更换为手机外部存储图库中的图片，选中图片后其Uri会覆盖Facebook头像URL。但出现异常：更换头像后退出登录，再次登录时显示的仍是Facebook头像，而非选中的图库图片。我怀疑当前代码未正确获取图片存储路径，打印的路径值不符合模拟器中图片的实际路径（如/storage/emulated/0/DCIM/Camera/image.jpg）。若能获取选中图片的名称，应该可正确将其保存到数据库，并在登录时读取。

public class perfil_user extends Fragment  {
    GoogleSignInClient mGoogleSignInClient;
    ImageView image_user,image_ok,image_edit;
    TextView name_user,email,tag_date;
    EditText alias;
    Button buttonSelectImage,buttonChangeAlias;
    public String name,facebook_firstname,facebook_lastname,email_facebook,facebook_user_name,str_datefb,str_datejoinedfb,last_season,string_Uri_gmail ;
    public String date_now,date_joined,last_date,alias_facebook,alias_perfil,get_alias,request_date,alias_perfil_gmail,personGivenName,personFamilyName,personName,personEmail,str_dategmail,str_datejoinedgmail,alias_name,compare_username,alias_gmail;
    private static int RESULT_LOAD_IMAGE = 1;
    public static String name_aux,alias_aux;
    public boolean click;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view=inflater.inflate(R.layout.perfil_user,container,false);
        image_user=view.findViewById(R.id.image_user);
        name_user=view.findViewById(R.id.NameUser);
        email=view.findViewById(R.id.setmail);
        alias=view.findViewById(R.id.setAlias);
        buttonSelectImage=view.findViewById(R.id.change_image);
        buttonChangeAlias = view.findViewById(R.id.change_alias);
        tag_date=view.findViewById(R.id.last_season_date);
        DateTimeFormatter datetime_formatter = DateTimeFormatter.ofPattern("HH:mm:ss dd/MM/YYYY");
        LocalDateTime now = LocalDateTime.now();
        date_now = datetime_formatter.format(now);
        ConexionSQliteHelper conn=new ConexionSQliteHelper(getContext(),"lala",null,1);
        buttonSelectImage.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(Intent.ACTION_PICK,MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                startActivityForResult(intent,3);
            }
        });
        
        if ( accessToken != null && !accessToken.isExpired()){
            GraphRequest request = GraphRequest.newMeRequest(accessToken, new GraphRequest.GraphJSONObjectCallback() {
                        @Override
                        public void onCompleted(JSONObject object, GraphResponse response) {
                            try {
                                facebook_firstname=object.getString("first_name");
                                facebook_lastname =object.getString("last_name");
                                facebook_user_name=object.getString("name");
                                email_facebook = object.getString("email");
                                
                                String url_perfil_facebook=object.getJSONObject("picture").getJSONObject("data").getString("url");
                                if (url_perfil_facebook.equals("")){
                                    url_perfil_facebook = "https://cdn.computerhoy.com/sites/navi.axelspringer.es/public/styles/1200/public/media/image/2017/08/252649-modo-incognito-no-es-seguro-ni-privado.jpg";
                                }
                                Picasso.get().load(url_perfil_facebook).into(image_user);
                                name_user.setText(facebook_user_name);
                                email.setText(email_facebook);
                                str_datefb = date_now;
                                str_datejoinedfb = date_now;
                                tag_date.setText(str_datefb);
                                boolean exist_user = conn.verifyIfUserExists(email_facebook);
                                if (exist_user) {
                                    String url_photo = conn.loadImage(facebook_user_name);
                                    Uri myUri = Uri.parse(url_photo);
                                    image_user.setImageURI(myUri);
                                    alias_perfil = conn.getUserName(email_facebook);
                                    alias_facebook = conn.requestAlias(alias_perfil);
                                    alias.setText(alias_facebook);
                                    String last_season =  conn.getLastDateofConnection(facebook_user_name);
                                    tag_date.setText(last_season);
                                    conn.overwriteDate(date_now,facebook_user_name);
                                } else {
                                    alias_name= generateAliasRandom();
                                    conn.insertUser(facebook_user_name,facebook_firstname,facebook_lastname,str_datefb,str_datejoinedfb,alias_name,email_facebook,null,url_perfil_facebook);
                                }
                                name_aux = name_user.getText().toString();
                                alias_aux = alias.getText().toString();
                            } catch (JSONException  e) {
                                e.printStackTrace();
                            }
                        }
                    });

            Bundle parameters = new Bundle();
            parameters.putString("fields","id,first_name,last_name,name,email,link,picture.type(large)");
            request.setParameters(parameters);
            request.executeAsync();
        }

       
        buttonChangeAlias.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                alias.setFocusableInTouchMode(true);
                alias.setText("");
                alias.setEnabled(true);
                click = true;
                alias.setOnKeyListener(new View.OnKeyListener() {
                    public boolean onKey(View v, int keyCode, KeyEvent event) {
                        if ((event.getAction() == KeyEvent.ACTION_DOWN) && (keyCode == KeyEvent.KEYCODE_ENTER)) {
                            alias.setCursorVisible(false);
                            alias.setEnabled(false);
                            alias.setTextColor(Color.BLACK);
                            int id = conn.requestId(name_user.getText().toString());
                            conn.overwriteAlias(alias.getText().toString(),id);
                            return true;
                        }
                        return false;
                    }
                });
            }
        });
        return  view;
    }

    private String generateAliasRandom(){
        String chars = "0123456789abcdefghijklmnopqrstuvwxyz";
        Random random = new Random();
        StringBuilder name_alias = new StringBuilder(10);
        for (int i = 0; i < 10; i++){
            name_alias.append(chars.charAt(random.nextInt(chars.length())));
        }
        alias.setText(name_alias);
        return String.valueOf(name_alias);
    }


    @RequiresApi(api = Build.VERSION_CODES.P)
    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        ConexionSQliteHelper conn=new ConexionSQliteHelper(getContext(),"lala",null,1);
        if(resultCode == RESULT_OK && data != null){
            Uri selectedImage = data.getData();
            image_user.setImageURI(selectedImage);
            String stringUri = selectedImage.toString();
            int id_user = conn.requestId(name_user.getText().toString());
            conn.overWriteImage(stringUri,id_user);
        }
    }
}

问题根源 #

1. 头像加载顺序错误：登录回调中先加载Facebook头像，之后才读取数据库中的自定义头像并设置，导致自定义头像被Facebook头像覆盖。
2. Uri处理不一致：使用image_user.setImageURI(myUri)加载本地Uri，而Facebook头像用Picasso加载，且未考虑自定义Uri为空的情况。

修复步骤 #

1. 调整登录时的头像加载逻辑

优先读取数据库中的自定义头像，只有当数据库中无自定义头像时，才加载Facebook头像：

@Override
public void onCompleted(JSONObject object, GraphResponse response) {
    try {
        facebook_firstname=object.getString("first_name");
        facebook_lastname =object.getString("last_name");
        facebook_user_name=object.getString("name");
        email_facebook = object.getString("email");
        
        String url_perfil_facebook=object.getJSONObject("picture").getJSONObject("data").getString("url");
        if (url_perfil_facebook.equals("")){
            url_perfil_facebook = "https://cdn.computerhoy.com/sites/navi.axelspringer.es/public/styles/1200/public/media/image/2017/08/252649-modo-incognito-no-es-seguro-ni-privado.jpg";
        }
        name_user.setText(facebook_user_name);
        email.setText(email_facebook);
        str_datefb = date_now;
        str_datejoinedfb = date_now;
        tag_date.setText(str_datefb);
        boolean exist_user = conn.verifyIfUserExists(email_facebook);
        
        if (exist_user) {
            String url_photo = conn.loadImage(facebook_user_name);
            // 优先加载数据库中的自定义头像
            if (url_photo != null && !url_photo.isEmpty()) {
                Uri myUri = Uri.parse(url_photo);
                Picasso.get().load(myUri).into(image_user);
            } else {
                Picasso.get().load(url_perfil_facebook).into(image_user);
            }
            alias_perfil = conn.getUserName(email_facebook);
            alias_facebook = conn.requestAlias(alias_perfil);
            alias.setText(alias_facebook);
            String last_season =  conn.getLastDateofConnection(facebook_user_name);
            tag_date.setText(last_season);
            conn.overwriteDate(date_now,facebook_user_name);
        } else {
            alias_name= generateAliasRandom();
            conn.insertUser(facebook_user_name,facebook_firstname,facebook_lastname,str_datefb,str_datejoinedfb,alias_name,email_facebook,null,url_perfil_facebook);
            Picasso.get().load(url_perfil_facebook).into(image_user);
        }
        name_aux = name_user.getText().toString();
        alias_aux = alias.getText().toString();
    } catch (JSONException  e) {
        e.printStackTrace();
    }
}

2. 统一Uri加载方式

所有头像加载都使用Picasso，替换image_user.setImageURI(selectedImage)为：

Picasso.get().load(selectedImage).into(image_user);

3. 验证数据库读写逻辑

检查conn.loadImage()和conn.overWriteImage()方法，确保数据库中头像字段的读写正确。可添加日志输出存储和读取的Uri值，确认数据是否正确持久化。

内容的提问来源于stack exchange，提问作者wuad