Question

我正在编写一个Android应用程序，我想节省用户在首选项中单击按钮的次数，然后在另一个类中检索该首选项。我在这一点上是完全初学者，任何帮助都将不胜感激。

Answer 1

尝试以下内容：

Activity1.java

SharedPreferences app_preferences = PreferenceManager.getDefaultSharedPreferences(Activity1.this);
SharedPreferences.Editor editor = app_preferences.edit();
int i=0;

    yourbutton.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                                    i++;
                    editor.putInt("counter", i);
                    editor.commit();
                }
            });

Activity2.java

SharedPreferences app_preferences = PreferenceManager.getDefaultSharedPreferences(this);
String counter = app_preferences.getInt("counter", 0);

Answer 2

这样做..

**Activity1.java**
------------------

SharedPreferences sp = getSharedPreferences("your_prefs", Activity.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
int myIntValue = sp.getInt("your_int_key",0);


        yourbutton.setOnClickListener(new OnClickListener() {

                    @Override
                    public void onClick(View v) {

                    editor.putInt("your_int_key",++myIntValue);
                                editor.commit();
                    }
                });

**Activity2.java**
-----------------

  SharedPreferences sp = getSharedPreferences("your_prefs", Activity.MODE_PRIVATE);
 int myIntValue = sp.getInt("your_int_key", 0);

Answer 3

// declare thsi class variable in class from where u will put the string u wanna store in shared pref 

//class variables

    SharedPreferences pref;
    SharedPreferences.Editor editor;
-------------------

//in oncrete method
// declare this in oncreate method 

        pref = getSharedPreferences("testapp", MODE_PRIVATE);
        editor = pref.edit();

// the varibale u wanna put use the below statements 
// for string use putString
// for boolean as u need use putBoolean 
// have a look at the various option it offers..


editor.putString("selected", "nil");
editor.commit();


// here is the statement use this statement in class where u wanna retireve ur strings
// use getBoolean for Boolean variables 

pref.getString("selected", "nil")

// here in sceond parameter in above statement is : if the value u r requesting for that is specified in first parameter is not present then it will return the //value which is your second parameter..

Answer 4

保存上一个按钮状态的一种方法是在Android中使用共享首选项。共享首选项允许存储关键值数据对，以后可以轻松检索。 Android中有一种数据访问机制。其他人是SqlLite数据库＆amp;档案。

有关共享偏好的Android文档

关于共享偏好的视频

现在再次回到你的问题。我曾经不得不保存一个checkbutton的状态。然后再次访问它（这似乎与你想要做的类似）

    Part 1 Accessing Share preference Values : 

        public static final String PREFS_FILE = "MyPreferences";
        public static final String PREFS_NAME = "USER_NAME";
        public static final String PREFS_CHOICE = "USER_CHOICE";

        SharedPreferences sp;

        public void onCreate(Bundle savedInstanceState) 
        {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main);

            chkChoice = (CheckBox)findViewById(R.id.chkChoice);
            btnMain = (Button)findViewById(R.id.btnMain);
            btnMain.setOnClickListener(this);

            // Here i access the shared preference file .
            sp = this.getSharedPreferences(PREFS_FILE, MODE_PRIVATE);
            // If i have a preference for my checkbox saved then load it else FALSE(unchecked) 
            chkChoice.setChecked(sp.getBoolean(PREFS_CHOICE, false));
        }


   Part 2 Setting Share preference from your activity :

    sp = this.getSharedPreferences(PREFS_FILE, MODE_PRIVATE);
    SharedPreferences.Editor editor = sp.edit();

    editor.putString(PREFS_NAME, txtName.getText().toString());
    editor.putBoolean(PREFS_CHOICE, chkChoice.isChecked());

    editor.commit();

    // Close the activity to show that the data is still saved
    finish();

上面是一个复选框。您必须根据要保存的按钮信息进行调整。希望这能让你开始。

将按钮单击次数保存到首选项

4 个答案: