仅从 android 中的数据库中获取最后一个值

Question

我已将值存储在数据库中，现在我正尝试从数据库中获取值。所有值都存储在数据库中，但是当我在字符串列表中获取值时，它只有 return 最后一个值。以下是我的代码。任何帮助将不胜感激。请

public 列出 GetBigRun() {

List<Run_Data_Model> bigRun_list = new ArrayList<>();

this.open();
Cursor cursor = database.query(MySQLiteHelper.TABLE_NAME_BIG_RUN,
        allColumns_table_big_run, null,
        null, null, null, null);

cursor.moveToFirst();
while (!cursor.isAfterLast()) {
    Run_Data_Model mBigRunObj = new Run_Data_Model();
    mBigRunObj.RunBtnState = cursor.getString(1);
    mBigRunObj.RunImages = cursor.getString(2);
    mBigRunObj.RunColor = cursor.getString(3);
    mBigRunObj.RunDays = cursor.getString(4);
    mBigRunObj.RunTime = cursor.getString(5);
    bigRun_list.add(mBigRunObj);
    cursor.moveToNext();
}
// Make sure to close the cursor
cursor.close();
this.close();
return bigRun_list;

}

这是我创建的数据库。

     public static final String TABLE_NAME_BIG_RUN ="big_run";

public static final String BIG_RUN_COLUMN_ID = "_id";

public static String BIG_RUN_BTN_STATE ="btn_state";
public static String BIG_RUN_BTN_IMAGE ="btn_image";
public static String BIG_RUN_BTN_COLOR ="btn_color";
public static String BIG_RUN_DAYS ="days";
public static String BIG_RUN_TIME ="time";


//Query for create table
private static final String DATABASE_CREATE_TABLE_BIG_RUN = "create table "
        + TABLE_NAME_BIG_RUN + "("+ BIG_RUN_COLUMN_ID
        + " integer primary key autoincrement,  " + BIG_RUN_BTN_STATE
        + " text ,  " + BIG_RUN_BTN_IMAGE
        + " text ,  " + BIG_RUN_BTN_COLOR
        + " text ,  " + BIG_RUN_DAYS
        + " text ,  " + BIG_RUN_TIME
        +  " text );";

这里我在数据库中保存值。

     private void PutValues() {
   mydata.DeleteAllBigRun();
    /*if(mPref.GetRunCount().equals("0")) {*/

        for (int i = 0; i < 73; i++) {
            Run_Data_Model runModel = new Run_Data_Model();
            runModel.RunDays = "Day " + (i + 12);
            runModel.RunImages = String.valueOf(R.drawable.cross_icon);
            runModel.RunBtnState = "0";
            runModel.RunColor = "#e76025";


       /* if (id == 1) {*/
            sec = sec + 20;
            int mins = sec / 60;
            int remainder = sec - mins * 60;
            int secs = remainder;
            runModel.RunTime = mins + " min " + secs + " sec";


       /* } else if (id == 2) {
            sec = sec + 40;
            int mins = sec / 60;
            int remainder = sec - mins * 60;
            int secs = remainder;
            runModel.RunTime = mins + " min " + secs + " sec";
            runModel.RunChallengeState = "2";

        } else if (id == 3) {
            runModel.RunTime = (i + 1) + " min ";
            runModel.RunChallengeState = "3";
        }*/
            mydata.InsertBigRunInTable(runModel.RunBtnState, runModel.RunImages, runModel.RunColor, runModel.RunDays, runModel.RunTime);

        }
        mPref.SetRunCount("1");
    //}


}

这就是我获取列表中的值并将其传递给适配器的方式。

       run_list = mydata.GetBigRun();
   /* for(int i=0;i<run_list.size();i++) {
        Log.d("run_list_size", run_list.get(i).RunDays);
    }*/
        gv = (GridView) findViewById(R.id.gridView1);
    gv.setNumColumns(4);
    RunChallengeAdapter adapter =new RunChallengeAdapter(this,run_list);
    gv.setAdapter(adapter);
    adapter.notifyDataSetChanged();

Answer 1

if (cursor.moveToFirst()) {
    do {

    Run_Data_Model mBigRunObj = new Run_Data_Model();
    mBigRunObj.RunBtnState = cursor.getString(1);
    mBigRunObj.RunImages = cursor.getString(2);
    mBigRunObj.RunColor = cursor.getString(3);
    mBigRunObj.RunDays = cursor.getString(4);
    mBigRunObj.RunTime = cursor.getString(5);
    bigRun_list.add(mBigRunObj);

    }while (cursor.moveToNext());
}

使用上面的代码并检查

Answer 2

我自己找到了解决方案。我的代码中的每一件事都是正确的并且可以工作，我犯的唯一错误是我的模型对象。我无意中为造成问题的对象添加了静态。

仅从 android 中的数据库中获取最后一个值

Getting only last values from database in android

android

listview

android-database