Question

我试图为我的listview创建一个自定义数组适配器，但模拟器总是崩溃，我看不到我的代码在哪里好，哪些不好。

logcat说“java.lang.OutOfMemoryError”，但我不知道如何解决。我尝试修改studio.exe.vmoptions文件或从整个应用程序中删除图像（即使它们只有50x50），而不费力。

所以我会发布我的代码，请求你帮我在我的应用程序中订购。

提前谢谢！

public class MyClassAdapter extends ArrayAdapter<Plate> {

private static class ViewHolder {
    TextView Id;
    ImageView Image;
    TextView Name;
    TextView Description;
    TextView Type;
    TextView Cost;
    TextView Count;
    TextView Comment;
    Button Buttonup;
    Button Buttondown;
}

public MyClassAdapter(Context context, int textViewResourceId, ArrayList<Plate> items) {
    super(context, textViewResourceId, items);
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {

    final Plate item = getItem(position);
    ViewHolder viewHolder;
    if (convertView == null) {
        convertView = LayoutInflater.from(this.getContext())
                .inflate(R.layout.item_main, parent, false);

        viewHolder = new ViewHolder();
        viewHolder.Id = (TextView)convertView.findViewById(R.id.code);
        viewHolder.Image = (ImageView) convertView.findViewById(R.id.image);
        viewHolder.Name = (TextView) convertView.findViewById(R.id.name);
        viewHolder.Description = (TextView) convertView.findViewById(R.id.description);
        viewHolder.Cost = (TextView) convertView.findViewById(R.id.price);
        viewHolder.Count = (TextView) convertView.findViewById(R.id.count);
        viewHolder.Buttonup = (Button) convertView.findViewById(R.id.button_up);
        viewHolder.Buttondown = (Button) convertView.findViewById(R.id.button_down);



        convertView.setTag(viewHolder);
    } else {
        viewHolder = (ViewHolder) convertView.getTag();
    }


    if (item!= null) {
        viewHolder.Id.setText(String.format("%d",item.getId()));
        viewHolder.Image.setImageURI(item.getImage());
        viewHolder.Name.setText(String.format("%s", item.getName()));
        viewHolder.Description.setText(String.format("%s", item.getDescription()));
        viewHolder.Name.setText(String.format("%s", item.getName()));
        viewHolder.Cost.setText(String.format("%s", item.getCost()));
        viewHolder.Count.setText(String.format("%d", item.getCount()));
        viewHolder.Buttonup.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                DBHelper mydb= new DBHelper(getContext());
                mydb.AddPlate(item.getId());
                item.CountUp();
               //update viewholder.Count
            }
        });
        viewHolder.Buttondown.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {
                DBHelper mydb= new DBHelper(getContext());
                mydb.RemovePlate(item.getId());
                item.CountDown();
                //update viewholder.Count
            }
        });
    }
    return convertView;
}

这是我的代码片段，它调用自定义ArrayAdapter

        ArrayList<Plate> FullMenu;
        FullMenu = mydb.getPlates("Entrees");
        Plate p;
        int i;
        MyClassAdapter adapter = new MyClassAdapter(this,0,FullMenu);
        ListView listView = (ListView) findViewById(R.id.list);
        listView.setAdapter(adapter);
        for (i=0; i < FullMenu.size(); i++) {
            p = FullMenu.get(i);
            adapter.add(p);
        }

Answer 1

移动setadapter

ArrayList<Plate> FullMenu;
    FullMenu = mydb.getPlates("Entrees");
    Plate p;
    int i;
    MyClassAdapter adapter = new MyClassAdapter(this,0,FullMenu);
    ListView listView = (ListView) findViewById(R.id.list);
    for (i=0; i < FullMenu.size(); i++) {
        p = FullMenu.get(i);
        adapter.add(p);
    }
    listView.setAdapter(adapter);

我也不认为你需要这个，因为你应该从适配器本身读取数据

 for (i=0; i < FullMenu.size(); i++) {
        p = FullMenu.get(i);
        adapter.add(p);
    }

你可以查看我在这里找到适配器的样本 https://github.com/juangdiaz/CoffeeApp/blob/master/app/src/main/java/com/juangdiaz/coffeeapp/adapter/ListAdapter.java

并在此处调用适配器 https://github.com/juangdiaz/CoffeeApp/blob/master/app/src/main/java/com/juangdiaz/coffeeapp/fragments/CoffeeListFragment.java

如果有帮助请告诉我

Answer 2

您应该调整大小 动态您的图片，这样可以避免内存失败。

You can read this lesson

And here you can see a simple example of its operation

祝你好运！

Listview定制适配器，带有imageview和按钮

2 个答案: