Get item count from SQL android

I have an SQL database on my app.

As the title says, how can I get my item count?

My app gets an input from the user and stores in the database, and displays it.

MainActivity.java

String task = inputField.getText().toString();
Log.d("MainActivity",task);

helper = new TaskDBHelperHome(MainActivity.this);
SQLiteDatabase db = helper.getWritableDatabase();
ContentValues values = new ContentValues();

values.clear();
values.put(TaskContractHome.Columns.TASK, task);

db.insertWithOnConflict(TaskContractHome.TABLE, null, values,
        SQLiteDatabase.CONFLICT_IGNORE);
updateUI();

.

TaskDBHelperHome.java

public class TaskDBHelperHome extends SQLiteOpenHelper {

    public TaskDBHelperHome(Context context) {
        super(context, TaskContractHome.DB_NAME, null, TaskContractHome.DB_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase sqlDB) {
        String sqlQuery =
                String.format("CREATE TABLE %s (" +
                                "_id INTEGER PRIMARY KEY AUTOINCREMENT, " +
                                "%s TEXT)", TaskContractHome.TABLE,
                        TaskContractHome.Columns.TASK);

        Log.d("TaskDBHelper","Query to form table: "+sqlQuery);
        sqlDB.execSQL(sqlQuery);
    }

    @Override
    public void onUpgrade(SQLiteDatabase sqlDB, int i, int i2) {
        sqlDB.execSQL("DROP TABLE IF EXISTS "+TaskContractHome.TABLE);
        onCreate(sqlDB);
    }
}

.

TaskContractHome.java

import android.provider.BaseColumns;

public class TaskContractHome {
    public static final String DB_NAME = "home";
    public static final int DB_VERSION = 1;
    public static final String TABLE = "tasks";

    public class Columns {
        public static final String TASK = "task";
        public static final String _ID = BaseColumns._ID;
    }
}

I want to know how I can count items in the database. (I mean programmatically) Thanks.