代码之家 › 专栏 › 技术社区 › lord_sneed

安卓系统:共享偏好问题(多个共享偏好)

sharedpreferences arraylist android

lord_sneed · 技术社区 · 12 年前

我有多个 SharedPreferences 每个存储一个 int 每个值。我已成功创建多个 共享首选项 之前,但我正在尝试一种稍微不同的方法。我只保留最高的5个值。我从它的 SharedPreference ,然后我将5个值加上我想与其他值进行比较的当前值 ArrayList 。我正在对它调用反向排序方法,然后删除最后一个值(因为它是多余的)。然后,我将每个索引放入 共享首选项 。这是我所拥有的:

prefs1 = this.getSharedPreferences("key1", Context.MODE_PRIVATE);
int value1 = prefs1.getInt("number1", 0);

prefs2 = this.getSharedPreferences("key2", Context.MODE_PRIVATE);
int value2 = prefs2.getInt("number2", 0);

prefs3 = this.getSharedPreferences("key3", Context.MODE_PRIVATE);
int value3 = prefs3.getInt("number3", 0);

prefs4 = this.getSharedPreferences("key4", Context.MODE_PRIVATE);
int value4 = prefs4.getInt("number4", 0);

prefs5 = this.getSharedPreferences("key5", Context.MODE_PRIVATE);
int value5 = prefs5.getInt("number5", 0);

ArrayList<Integer> numList = new ArrayList<Integer>();
Collections.addAll(numList, value0, value1, value2, value3, value4, value5);
Collections.sort(numList, Collections.reverseOrder());
numList.remove(numList.size()-1);
value1 = numList.get(0);
value2 = numList.get(1);
value3 = numList.get(2);
value4 = numList.get(3);
value5 = numList.get(4);

Editor editor = prefs1.edit();
editor.putInt("number1", value1);
editor.commit();

editor = prefs2.edit();
editor.putInt("number2", value2);
editor.commit();

editor = prefs3.edit();
editor.putInt("number3", value3);
editor.commit();

editor = prefs4.edit();
editor.putInt("number4", value4);
editor.commit();

editor = prefs5.edit();
editor.putInt("number5", value5);
editor.commit();

我遇到的问题是,即使在 value0 在执行完之后为正。

我这样做有什么不对吗?(如果不是,那一定是当我在另一项活动中得到这些值时,但我几乎肯定我有这个权利。)

编辑*

也许是在检索中,这里来自检索活动:

prefs1 = this.getSharedPreferences("key1", Context.MODE_PRIVATE);
num1 = prefs1.getInt("number1", 0); //0 is the default value
tv1 = (TextView) findViewById(R.id.val1);
tv1.setText(String.valueOf(num1));

prefs2 = this.getSharedPreferences("key2", Context.MODE_PRIVATE);
num2 = prefs2.getInt("number2", 0); //0 is the default value
tv2 = (TextView) findViewById(R.id.val2);
tv2.setText(String.valueOf(num2));

prefs3 = this.getSharedPreferences("key3", Context.MODE_PRIVATE);
num3 = prefs3.getInt("number3", 0); //0 is the default value
tv3 = (TextView) findViewById(R.id.val3);
tv3.setText(String.valueOf(num3));

prefs4 = this.getSharedPreferences("key4", Context.MODE_PRIVATE);
num4 = prefs4.getInt("number4", 0); //0 is the default value
tv4 = (TextView) findViewById(R.id.val4);
tv4.setText(String.valueOf(num4));

prefs5 = this.getSharedPreferences("key5", Context.MODE_PRIVATE);
num5 = prefs5.getInt("number5", 0); //0 is the default value
tv5 = (TextView) findViewById(R.id.val5);
tv5.setText(String.valueOf(num5));

1 回复 | 直到 12 年前

Community CDub 8 年前

你可以把SharedPreferences想象成一个巨大的地图来存放你所有的东西,但除非你在做一些奇怪的事情,否则你应该从同一个巨大地图(即同一个SharedPreferences)中存储和检索数据。您正在做的是创建命名的共享首选项。我建议只使用默认值。如果你想了解更多这意味着什么 check out this question.

因此,在您的情况下,如果您要存储5个值,您可以在相同的范围内这样做 SharedPreferences 只需提供以下不同的密钥:

SharedPreferences mSharedPreferences = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());  
SharedPreferences.Editor mSharedPreferencesEditor = mSharedPreferences.edit();

mSharedPreferencesEditor.putInt("numberX", numberX);
mSharedPreferencesEditor.putInt("numberY", numberY);
mSharedPreferencesEditor.commit()

mSharedPreferences.getInt("numberX", numberX);
mSharedPreferences.getInt("numberY", numberY);

你可以很容易地 get 和 put 将不同的密钥转换为相同的sharedPrefs。您的代码将变为:

SharedPreferences mSharedPreferences = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());  
SharedPreferences.Editor mSharedPreferencesEditor = mSharedPreferences.edit();

int value1 = mSharedPreferences.getInt("number1", 0);
int value2 = mSharedPreferences.getInt("number2", 0);
int value3 = mSharedPreferences.getInt("number3", 0);
int value4 = mSharedPreferences.getInt("number4", 0);
int value5 = mSharedPreferences.getInt("number5", 0);

...

mSharedPreferencesEditor.putInt("number1", value1);
mSharedPreferencesEditor.putInt("number2", value2);
mSharedPreferencesEditor.putInt("number3", value3);
mSharedPreferencesEditor.putInt("number4", value4);
mSharedPreferencesEditor.putInt("number5", value5);
mSharedPreferencesEditor.commit();

您关于所有值为0的问题可能有所不同。我完全希望你对getInt的所有调用都是0,因为你是从不在sharedPrefs中存储0以外的任何内容。看起来你只是在加零和加零。我不确定你想在这里做什么,但在调用此函数之前,通过调用将数字1-5分配给0以外的值肯定会有所帮助 mSharedPreferencesEditor.putInt(number); 在sharedPrefs对象上,如下所示:

SharedPreferences mSharedPreferences = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());  
SharedPreferences.Editor mSharedPreferencesEditor = mSharedPreferences.edit();

//for example, for the key "number5"
mSharedPreferencesEditor.putInt("number5", value5);