Question

我有一个应用程序，用于检查我的业务。我希望看到15个最近的分数，所以我可以看到我们是变得越来越好。它应该工作的方式是，每次提交新的时，最新的一个将返回顶部并删除最旧的一个。

我的共享偏好类

public class SharedPreference {

    public static final String PREFS_NAME = "AOP_PREFS";
    public static final String PREFS_KEY = "AOP_PREFS_String";

    public SharedPreference() {
        super();
    }

    public void save(Context context, String text) {
        SharedPreferences settings;
        Editor editor;

        //settings = PreferenceManager.getDefaultSharedPreferences(context);
        settings = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE); //1
        editor = settings.edit(); //2

        editor.putString(PREFS_KEY, text); //3

        editor.commit(); //4
    }

    public String getValue(Context context) {
        SharedPreferences settings;
        String text;

        //settings = PreferenceManager.getDefaultSharedPreferences(context);
        settings = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
        text = settings.getString(PREFS_KEY, null);
        return text;
    }

    public void clearSharedPreference(Context context) {
        SharedPreferences settings;
        Editor editor;

        //settings = PreferenceManager.getDefaultSharedPreferences(context);
        settings = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
        editor = settings.edit();

        editor.clear();
        editor.commit();
    }

    public void removeValue(Context context) {
        SharedPreferences settings;
        Editor editor;

        settings = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
        editor = settings.edit();

        editor.remove(PREFS_KEY);
        editor.commit();
    }
}

我的View就像这样

public class past extends AppCompatActivity {

    // UI References
    private TextView textTxt;

    private String text;

    private SharedPreference sharedPreference;

    Activity context = this;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_past);

        sharedPreference = new SharedPreference();

        findViewsById();

        //Retrieve a value from SharedPreference
        text = sharedPreference.getValue(context);
        textTxt.setText(text);

    }

    private void findViewsById() {
        textTxt = (TextView) findViewById(R.id.scores);
    }

}

现在它显示的是最近的一个，没有别的。我怎么做到它将持有15个字符串？

Answer 1

使用sqlite数据库，这是我可以展示的简单实施指南，有关谷歌搜索的更多信息。

您的DB_helper看起来如何，您可以在此处定义参数ect。

public class DBHelper extends SQLiteOpenHelper {

    public static final String DATABASE_NAME = "yourDBname.db";
    public static final String TABLE_NAME = "yourtableName";
    public static final String COL_1 = "ID";
    public static final String COL_2 = "FIRSTColumnName";
    public static final String COL_3 = "SECONDColumnName";

    public DBHelper(Context context) {
        super(context, DATABASE_NAME, null, 1);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL("create table "+ TABLE_NAME + "(ID INTEGER PRIMARY KEY AUTOINCREMENT, FIRSTColumnName INTEGER,SECONDColumnName INTEGER)");

    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXISTS"+ TABLE_NAME);
        onCreate(db);

    }

    public boolean insertData(int FIRSTColumnName, int SECONDColumnName){
        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues contentValues = new ContentValues();
        contentValues.put(COL_2,FIRSTColumnName);
        contentValues.put(COL_3,SECONDColumnName);
        long reuslt = db.insert(TABLE_NAME,null,contentValues);
        if (reuslt == -1)
            return false;
        else
            return true;
    }
}

然后在你的主应用程序中：

public void AddData(){

    gumb_poslji.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            int seekBarProgressValue = seekBar.getProgress();//for example
            int seekBarProgressValue2 = seekBar2.getProgress();//for example
            String str1 = String.valueOf(seekBarProgressValue);
            String str2 = String.valueOf(seekBarProgressValue2);

            String data = str1;
            String data2 = str2;
           boolean check_of_entry = myDb.insertData(data ,data2);
            if (check_of_entry ==true)
                Toast.makeText(MainActivity.this, "Success",Toast.LENGTH_LONG).show();
            else
                Toast.makeText(MainActivity.this, "Try again",Toast.LENGTH_LONG).show();
        }
    });

}

如果您需要任何进一步的帮助，请告诉我。

使用共享偏好来获得最近的15个分数

1 个答案: