java - 如何在不显示java中的值的情况下为每一行设置一个值

Question

我有一个字符串数组，它显示在 listView 上；但是，我希望为这些行中的每一行分配一个 int 数组，以便在单击它时，它将从用户“total_pts”中减去，然后显示在 totalPoints textview 上，如果他们有足够的点开始

这里是TextView和总点变量:

int total_pts =0;
TextView totalPoints = (TextView)findViewById(R.id.totalP);

这是 ListView :

ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, android.R.id.text1, redeem);

//assign to listview
list.setAdapter(adapter);

//click listener
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {

    @Override
    public void onItemClick(AdapterView<?> parent, View view,
                            int position, long id) {

        //ListView Clicked item index
        int itemPosition     = position;

        int[] points = new int[]{120,150,200,200,300,400,600};

        if (total_pts >= points){
            //where I am stuck...the conditional statement won't work because I 
            //am unsure how to say the points(value) at a certain index 
            //(the index clicked) and then subtract them and then display them
            total_pts-=points;
            totalPoints.text = "Total Points: \(Total_Points)"

        }
    }
});

Answer 1

您可以使用position 从points 数组中获取值

list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view,
                            int position, long id) {
        // move it outside oncreate
        // no need to recreate this array everytime on click
        int[] points = new int[]{120,150,200,200,300,400,600};

        if(total_pts>=points[position]){
            total_pts-=points[position]; 
            totalPoints.setText("Total Points "+String.valueOf(total_pts));      
         }//else{ // optional 
            //totalPoints.setText("Not enough points");      
         //}
    }
});