如何刪除自定義列表視圖中的行

Question

我想通過按下要刪除的行中的按鈕來從定製列表視圖中刪除行。我把我的代碼：

的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; 
} 

的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> 

的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); 

} 

那麼該怎麼辦呢？我表明，代表我的意思的圖片：

Answer 1

的第一件事情，而不是存儲數據的各部分在不同的陣列，你應該將它們存儲在代表則每行有一個ArrayList對象行中的適配器。

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; 
    } 
} 

接下來，您需要對適配器進行一些更改，以使用行列表而不是您擁有的陣列。

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; 
} 

您的活動，您需要使用您目前有

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細節填充陣列創建行對象的列表，您需要吸氣劑添加到Row類提供並使用那些在您textviews等

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

Answer 2

填補當你已經完成了第一個答案，創建右視圖「negativo」的OnItemClickListener。該項監聽器刪除數組中的對象（以及字符串）。然後更新列表。祝你好運！