Question

我正在开发一个Android应用程序。我想在其中显示一个屏幕，以允许用户保存未知数量的字符串稍后将出现在菜单中。我通过使用SharedPreferences创建和更新字符串集来做到这一点。

问题： 直到我转到另一个活动，由于某种原因，存储在共享preferences中的字符串集 presets 现在仅包含存储的第一个字符串，它似乎工作正常。当我参加创建/更新的活动时共享首选项字符串集预设包含所有这些首选项。

以下是我的代码：

创建/更新字符串集（并记录其存在）
记录它存在于第二个活动中

记录消息，显示原始和第二个活动中字符串集的内容

public void bSave(View view) {

        Set<String> presets;

        Integer HOR_RES = Integer.parseInt(editTextHor.getText().toString());
        Integer VERT_RES = Integer.parseInt(editTextVert.getText().toString());
        String str = (editTextTitle.getText().toString()+HOR_RES + "x" + VERT_RES);



    SharedPreferences settings = getSharedPreferences("Share", Context.MODE_PRIVATE);
    SharedPreferences.Editor edit = settings.edit();



    presets = settings.getStringSet("presets", new HashSet<String>());
    presets.add(str);
    Log.e("f                  u", presets.toString());

    edit.putStringSet("presets",presets);
    edit.apply();
    Log.e("f                  u", settings.getStringSet("presets", new HashSet<String>()).toString());


}

AND

SharedPreferences settings = getSharedPreferences("Share", Context.MODE_PRIVATE);
Set<String> strings = settings.getStringSet("presets", new HashSet<String>());      
Log.e("f                  u", settings.getStringSet("presets", new HashSet<String>()).toString());

AND

2018-11-29 13:37:53.107 12030-12030/screenresizerpremiumv2.andrewdaw.com.screenresizerpremium E/MemoryLeakMonitorManager: MemoryLeakMonitor.jar is not exist!
2018-11-29 13:37:53.110 12030-12030/screenresizerpremiumv2.andrewdaw.com.screenresizerpremium E/Minikin: Could not get cmap table size!
2018-11-29 13:37:53.755 12030-12053/screenresizerpremiumv2.andrewdaw.com.screenresizerpremium E/vndksupport: Could not load vendor/lib64/egl/libGLES_mali.so from sphal namespace: dlopen failed: library "vendor/lib64/egl/libGLES_mali.so" not found.
2018-11-29 13:37:53.782 12030-12030/screenresizerpremiumv2.andrewdaw.com.screenresizerpremium E/f                  u: []
2018-11-29 13:38:11.938 12030-12030/screenresizerpremiumv2.andrewdaw.com.screenresizerpremium E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
2018-11-29 13:38:11.938 12030-12030/screenresizerpremiumv2.andrewdaw.com.screenresizerpremium E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
2018-11-29 13:38:11.974 12030-12030/screenresizerpremiumv2.andrewdaw.com.screenresizerpremium E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
2018-11-29 13:38:18.235 12030-12030/screenresizerpremiumv2.andrewdaw.com.screenresizerpremium E/f                  u: [11x1]
2018-11-29 13:38:21.548 12030-12030/screenresizerpremiumv2.andrewdaw.com.screenresizerpremium E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
2018-11-29 13:38:21.581 12030-12030/screenresizerpremiumv2.andrewdaw.com.screenresizerpremium E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
2018-11-29 13:38:21.581 12030-12030/screenresizerpremiumv2.andrewdaw.com.screenresizerpremium E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
2018-11-29 13:38:21.638 12030-12030/screenresizerpremiumv2.andrewdaw.com.screenresizerpremium E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
2018-11-29 13:38:21.638 12030-12030/screenresizerpremiumv2.andrewdaw.com.screenresizerpremium E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
2018-11-29 13:38:26.323 12030-12030/screenresizerpremiumv2.andrewdaw.com.screenresizerpremium E/f                  u: [22x2, 11x1]
2018-11-29 13:38:26.324 12030-12030/screenresizerpremiumv2.andrewdaw.com.screenresizerpremium E/f                  u: [22x2, 11x1]

AND

2018-11-29 13:38:45.544 12289-12289/? E/MemoryLeakMonitorManager: MemoryLeakMonitor.jar is not exist!
2018-11-29 13:38:45.546 12289-12289/? E/Minikin: Could not get cmap table size!
2018-11-29 13:38:46.214 12289-12329/? E/vndksupport: Could not load vendor/lib64/egl/libGLES_mali.so from sphal namespace: dlopen failed: library "vendor/lib64/egl/libGLES_mali.so" not found.
2018-11-29 13:38:46.255 12289-12289/screenresizerpremiumv2.andrewdaw.com.screenresizerpremium E/f                  u: [11x1]

Answer 1

在遇到完善的库之前，我实际上遇到了同样的问题，并且不需要太多代码，而且代码看上去也很疯狂，FastSave：https://github.com/yehiahd/FastSave-Android 尽管具有像普通变量一样的存储能力，但它也可以将对象保存为仅一行的便捷操作。FastSave.getInstance（）。saveObject（key，customObject）; //用于保存自定义对象签出...

Answer 2

无法弄清楚，所以改为这样做

public void bSave(View view) {

            Set<String> presets;

            Integer HOR_RES = Integer.parseInt(editTextHor.getText().toString());
            Integer VERT_RES = Integer.parseInt(editTextVert.getText().toString());
            String str = (editTextTitle.getText().toString()+HOR_RES + "x" + VERT_RES);

            SharedPreferences settings = getSharedPreferences("Share", Context.MODE_PRIVATE);
            SharedPreferences.Editor edit = settings.edit();

            int i = 0;
            while(!settings.getString("preset"+i,"").equals("")){
                i++;
            }

            edit.putString("preset"+i,str);
            edit.apply();


    }

检索

int i = 0;
SharedPreferences settings = getSharedPreferences("Share", Context.MODE_PRIVATE);



while(!settings.getString("preset"+i,"").equals("")){
    menu.add(settings.getString("preset"+i,""));
    i++;
}

更新共享首选项设置的奇怪问题

2 个答案: