Question

我正在创建一个包含多项活动的应用。 SharedPreferences在多个活动中被读取。

我发现当我更新其中一个SharedPreferences文件中的单个变量时，该文件中的所有变量都会占用指定的值。

是否有可能发生这种情况的一般原因？如果没有，我可以发布代码。

以下代码用于写入和读取值（所有大写的内容都是唯一的整数常量）

public void LevelUp(int gameType) {
    step++;
    SharedPreferences settings = getSharedPreferences("Steps", 0);
    SharedPreferences.Editor editor = settings.edit();
    switch (gameType) {
        case NUMBERS_SPEED:   editor.putInt("NUMBERS_SPEED",   step);
        case NUMBERS_BINARY:  editor.putInt("NUMBERS_BINARY",  step);
        case NUMBERS_SPOKEN:  editor.putInt("NUMBERS_SPOKEN",  step);
        case LISTS_WORDS:     editor.putInt("LISTS_WORDS",     step);
        case LISTS_EVENTS:    editor.putInt("LISTS_EVENTS",    step);
        case SHAPES_FACES:    editor.putInt("SHAPES_FACES",    step);
        case SHAPES_ABSTRACT: editor.putInt("SHAPES_ABSTRACT", step);
        case CARDS_SPEED:     editor.putInt("CARDS_SPEED",     step);
    }
    editor.commit();        
}

public int getStep(int gameType) {
    SharedPreferences settings = getSharedPreferences("Steps", 0);
    switch (gameType) {
        case NUMBERS_SPEED:   return settings.getInt("NUMBERS_SPEED", 1);
        case NUMBERS_BINARY:  return settings.getInt("NUMBERS_BINARY", 1);
        case NUMBERS_SPOKEN:  return settings.getInt("NUMBERS_SPOKEN", 1);
        case LISTS_WORDS:     return settings.getInt("LISTS_WORDS", 1);
        case LISTS_EVENTS:    return settings.getInt("LISTS_EVENTS", 1);
        case SHAPES_FACES:    return settings.getInt("SHAPES_FACES", 1);
        case SHAPES_ABSTRACT: return settings.getInt("SHAPES_ABSTRACT", 1);
        case CARDS_SPEED:     return settings.getInt("CARDS_SPEED", 1);
        default: return -1;
    }
}

以下代码保留了不同的活动：

SharedPreferences settings = getSharedPreferences("Steps", 0);
step = settings.getInt("NUMBERS_SPOKEN", 1);

Answer 1

您需要在案例陈述之间中断

switch (gameType) {
    case NUMBERS_SPEED:   editor.putInt("NUMBERS_SPEED",   step);
    break;
    case NUMBERS_BINARY:  editor.putInt("NUMBERS_BINARY",  step);
    break;

否则它将通过每个案例陈述，这就是为什么他们都被分配了该值

Android SharedPreferences所有变量分配给相同的值

1 个答案: