Question

我想通过按下要删除的行中的按钮从自定义列表视图中删除一行。我把我的代码：

adapter.java

public class Adapter extends ArrayAdapter<String> {

/** VARIABILI */
int[] bandiera = {};
int[] positivo = {};
int[] negativo = {};
String[] piatti = {};
String[] qta = {};
String[] ntavolo = {};
Context c;
LayoutInflater inflater;
static int cambiobandiera=0; /** SE 0 E' VERDE, SE 1 E' ROSSA

/** COSTRUTTORE */
public Adapter(Context context, String[] piatti, String[] qta, String[] ntavolo, int[] bandiera,
               int[] positivo, int[] negativo)
{
    super(context, R.layout.rigatabella, piatti);

    this.c = context;
    this.piatti = piatti;
    this.qta = qta;
    this.ntavolo = ntavolo;
    this.bandiera = bandiera;
    this.positivo = positivo;
    this.negativo = negativo;
}

public class ViewHolder
{
    ImageView bandiera;
    TextView ntavolo;
    TextView piatto;
    TextView qta;
    ImageView positivo;
    ImageView negativo;
}

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

    if(convertView==null)
    {
        inflater= (LayoutInflater) c.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView=inflater.inflate(R.layout.rigatabella, null);
    }

    final ViewHolder holder= new ViewHolder();

    /** INZIALIZZO LE VIEWS */
    holder.piatto = (TextView) convertView.findViewById(R.id.piatto);
    holder.ntavolo = (TextView) convertView.findViewById(R.id.ntavolo);
    holder.qta = (TextView) convertView.findViewById(R.id.qta);
    holder.bandiera = (ImageView) convertView.findViewById(R.id.bandiera);
    holder.positivo = (ImageView) convertView.findViewById(R.id.positivo);
    holder.negativo = (ImageView) convertView.findViewById(R.id.negativo);

    /** ASSEGNARE I DATI */
    holder.bandiera.setImageResource(bandiera[position]);
    holder.ntavolo.setText(ntavolo[position]);
    holder.piatto.setText(piatti[position]);
    holder.qta.setText(qta[position]);
    holder.positivo.setImageResource(positivo[position]);
    holder.negativo.setImageResource(negativo[position]);

    holder.bandiera.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            if (cambiobandiera == 0) {
                holder.bandiera.setImageResource(R.mipmap.flagrossa);
                cambiobandiera = 1;
            } else {
                holder.bandiera.setImageResource(R.mipmap.flag);
                cambiobandiera = 0;
            }
        }
    });

    holder.positivo.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            //MAKE THE ROW TURNS GREEN
        }
    });

    holder.negativo.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            //REMOVE ROW FROM LISTVIEW
        }
    });

    return convertView;
}

rigatabella.xml

<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal" android:layout_width="match_parent"
android:layout_height="match_parent">


<TableRow
    android:layout_height="wrap_content"
    android:layout_width="fill_parent"
    android:gravity="center_horizontal">
    <ImageView
        android:id="@+id/bandiera" android:clickable="true"
        android:src="@mipmap/flag"
        android:layout_height="53dp"
        android:layout_width="1dp" android:gravity="center"
        android:layout_weight="1" />
    <TextView
        android:id="@+id/ntavolo" android:text="tav."
        android:layout_weight="1"
        android:textColor="#000000"
        android:layout_width="1dp"
        android:padding="20dip" android:gravity="center"/>
    <TextView
        android:id="@+id/piatto" android:text="Piatto"
        android:layout_weight="1"
        android:textColor="#000000"
        android:layout_width="250dp"
        android:padding="20dip" android:gravity="center"/>
    <TextView
        android:id="@+id/qta" android:text="qta"
        android:layout_weight="1"
        android:textColor="#000000"
        android:layout_width="1dp"
        android:padding="20dip" android:gravity="center"/>
    <ImageView
        android:id="@+id/positivo" android:src="@mipmap/conferma"
        android:layout_weight="1" android:layout_height="53dp"
        android:layout_width="1dp" android:gravity="center"/>
    <ImageView
        android:id="@+id/negativo" android:src="@mipmap/delete"
        android:layout_weight="1" android:layout_height="53dp"
        android:layout_width="1dp" android:gravity="center"/>
</TableRow>

MainActivity.java

public class MainActivity extends AppCompatActivity {

ListView lv;
String[] ntavolo={"2","4","3","5"};
String[] piatti={"Spaghetti allo scoglio","Lasagne","Cacca","Verdure miste"};
String[] qta={"2","4","1","1"};
int[] bandiera={R.drawable.flag, R.drawable.flag,R.drawable.flag,R.drawable.flag};
int[] positivo={R.drawable.conferma,R.drawable.conferma,R.drawable.conferma,R.drawable.conferma};
int[] negativo={R.drawable.delete,R.drawable.delete,R.drawable.delete,R.drawable.delete};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    lv = (ListView) findViewById(R.id.listView);

    /** ADAPTER */
    Adapter adapter = new Adapter(this, piatti, qta, ntavolo, bandiera, positivo, negativo);
    lv.setAdapter(adapter);

}

那怎么办？我展示了一张代表我的意思的图片：

Answer 1

首先，不是将数据的每个部分存储在不同的数组中，而应将它们存储在表示每行的Object中，然后在适配器中有一个arraylist行。

public class Row {
    private int bandiera;
    private int positivo;
    private int negativo;
    private String piatti;
    private String qta;
    private String ntavolo;

    public Row(int bandiera, int positivo, int negativo, String piatta, String qta, String ntavolo) {
        this.bandiera = bandiera;
        this.positivo = positivo;
        this.negativo = negativo;
        this.piatti = piatta;
        this.qta = qta;
        this.ntavolo = ntavolo;
    }
}

接下来，您需要对适配器进行一些更改，以使用行列表而不是您拥有的阵列。

public class Adapter extends BaseAdapter {

/** VARIABILI */
ArrayList<Row> rows = new ArrayList<>();
Context c;
LayoutInflater inflater;
static int cambiobandiera=0; /** SE 0 E' VERDE, SE 1 E' ROSSA

/** COSTRUTTORE */
public Adapter(Context context, ArrayList<Row> rows)
{
    super(context, R.layout.rigatabella);
    this.c = context;
    this.rows = rows;
}

public int getCount() {
    return rows.size();
}

public Row getItem(int position) {
    return rows.get(position);
}

public class ViewHolder
{
    ImageView bandiera;
    TextView ntavolo;
    TextView piatto;
    TextView qta;
    ImageView positivo;
    ImageView negativo;
}

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    Row row = getItem(position);
    // Here use row to fill in your textviews etc. You'll need to add getters to the Row model


    holder.negativo.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            rows.remove(position); // This removes the row from the dataset
            notifyDataSetChanged(); // This tells the adapter to update (to show the change on screen)
        }
    });

    return convertView;
}

在您的活动中，您需要使用当前拥有的阵列

创建Row对象列表

ArrayList<Row> rows = new ArrayList<>();
for (int i=0; i < ntavolo.length; i++) {
// This is not very safe. If any of the arrays are smaller than the ntavolo array it will crash
    row.add(new Row(bandiera[i], positivo[i], negativo[i], piatti[i], qta[i], ntavolo[i]));     
}
Adapter adapter = new Adapter(this, rows);
lv.setAdapter(adapter);

要在getView中填写详细信息，您需要将getter添加到提供的Row类中，并使用它们填写您的textviews等。

holder.ntavolo.setText(row.getNtavolo());

Answer 2

完成第一个答案后，为右视图“negativo”创建一个OnItemClickListener。此项侦听器删除Array（和字符串）中的对象。然后更新列表。祝你好运！

如何从customlistview中删除行

2 个答案: