android - 如何在没有 onClick 的情况下突出显示 ListView 中的行？

Question

我需要在没有 onClick 的情况下自动突出显示 ListView 中的一行。我的应用程序所做的是在食品有效期低于 90 天时对特定食品发出警报(突出显示)。我在 Stack Overflow 上搜索了一个解决方案，但所有亮点都是使用 onClick 实现的。我已经为我的 ListView 实现了 onClick 高亮显示(这不是我想要的)有没有什么方法可以在食品有效期低于 90 天时自动实现高亮显示？任何帮助将不胜感激!

当我点击产品 Milo 时会出现突出显示，如何让突出显示自动显示在 90 天以内过期的食品上

这是我的 XML 布局

    <ListView
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_above="@+id/AddProduct"
        android:id="@+id/listView2"
        android:layout_centerHorizontal="true"
        android:layout_alignParentTop="true"
        android:choiceMode="multipleChoice"
        android:listSelector="@drawable/Selector"
        />

我的 Java 文件

 @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_inventory);
    AddProduct = (Button) findViewById(R.id.AddProduct);
    camera = (ImageButton) findViewById(R.id.camera);
    AddProduct.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            startActivity(new Intent(Inventory.this, AddProduct.class));
        }
    });
    camera.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent(getApplicationContext(), BarcodeCaptureActivity.class);
            startActivityForResult(intent, BARCODE_READER_REQUEST_CODE);

        }
    });

    mList = (ListView) findViewById(R.id.listView2);
    arrayAdapter = new ItemsAdapter(this, android.R.layout.simple_list_item_1, items);
    mList.setAdapter(arrayAdapter);
    database = FirebaseDatabase.getInstance().getReference("All Barcodes");
    final List<String> keys = new ArrayList<>(); // will contain list of keys corresponding to listview item
    database.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(final DataSnapshot dataSnapshot) {
            arrayAdapter.clear();
            for(final DataSnapshot snapshot : dataSnapshot.getChildren()){
                arrayAdapter.notifyDataSetChanged();

                Calendar c = Calendar.getInstance();
                SimpleDateFormat df = new SimpleDateFormat("dd/MM/yyyy");
                String dateNow = df.format(c.getTime());
                String exp = snapshot.child("expiration").getValue().toString();
                String barcode = snapshot.child("barcode").getValue().toString();
                String name = snapshot.child("pname").getValue().toString();
                String q =  snapshot.child("quantity").getValue().toString();

                Date d1 = null;
                Date d2 = null;
                try{
                    d1 = df.parse(exp);
                    d2 = df.parse(dateNow);
                }
                catch(Exception e){
                }

                long diff =  d1.getTime() - d2.getTime();
                long hours = diff/(60*60*1000);
                long days = hours/24;

                if (days<=90){
                    NotificationGenerator.openActivityNotification(getApplicationContext(),barcode, name, days);
                    Log.i( "Item expring in: " , days + " days");
                    Log.i("Item's barcode is " , barcode);



                }
                else{
                    Log.i("Item expring in: " , days + " days");
                }

                String value = (String) snapshot.child("expiration").getValue();

                items eachItem = new items(name,value.toString(),Long.toString(days),q);

                arrayAdapter.add(eachItem);

                keys.add(snapshot.getKey());


            }
            arrayAdapter.notifyDataSetChanged();

            mList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> adapterView, View view, final int i, long l) {

                    view.setSelected(true);
                    String myKey = keys.get(i);
                    Intent intent  = new Intent(Inventory.this,Edit.class);
                   intent.putExtra("value",myKey);
                   startActivity(intent);
                }
            });
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });

}

我的 ListView 适配器

public class ItemsAdapter extends ArrayAdapter<items> {
private ArrayList<items> itemObjects;

public ItemsAdapter(Context context, int textViewResourceId, ArrayList<items> itemObjects) {
    super(context, textViewResourceId, itemObjects);
    this.itemObjects = itemObjects;
}

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

    View v = convertView;

    // first check to see if the view is null. if so, we have to inflate it.
    // to inflate it basically means to render, or show, the view.

    if (v == null) {

        LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        //inflating the tex views from list_items.xml
        v = inflater.inflate(R.layout.list_items, null);
    }

    /*
     * Recall that the variable position is sent in as an argument to this method.
     * The variable simply refers to the position of the current object in the list. (The ArrayAdapter
     * iterates through the list we sent it)
     *
     * Therefore, i refers to the current Item object.
     */
    items i = itemObjects.get(position);

    //If i is not null
    if (i != null) {

        // obtaining a reference to the TextViews.
        // These TextViews are created in the XML files we defined.
        TextView ProdName = (TextView) v.findViewById(R.id.ProductName);
        TextView ProdNameValue = (TextView) v.findViewById(R.id.ProductNameData);
        TextView ExpiryDate = (TextView) v.findViewById(R.id.ExpiryDate);
        TextView ExpiryDateData = (TextView) v.findViewById(R.id.ExpiryDateData);
        TextView ExpiryIn = (TextView) v.findViewById(R.id.ExpiryIn);
        TextView ExpiryInData = (TextView) v.findViewById(R.id.ExpiryInData);
        TextView BarCode = (TextView) v.findViewById(R.id.BarCode);
        TextView BarCodeData = (TextView) v.findViewById(R.id.BarCodeData);

        // check to see if each individual text view is null.
        // if text view is not null (means containing the reference) , it will assign text/value!
        if (ProdName != null){
            ProdName.setText("Name: ");
        }
        if (ProdNameValue != null){
            ProdNameValue.setText(i.getName());
        }
        if (ExpiryDate != null){
            ExpiryDate.setText("Expiry Date: ");
        }
        if (ExpiryDateData != null){
            ExpiryDateData.setText(i.getValue());
        }
        if (ExpiryIn != null){
            ExpiryIn.setText("Expiry In (Days): ");
        }
        if (ExpiryInData != null){
            ExpiryInData.setText(i.getDays());
        }
        if (BarCode != null){
            BarCode.setText("Quantity: ");
        }
        if (BarCodeData != null){
            BarCodeData.setText(i.getQuantity());
        }
    }

    // the view must be returned to our activity
    return v;

}

Answer 1

当您添加到期日期时，您应该在适配器中执行此操作，检查它是否超过 90 天，然后提供您想要的颜色。