当我选中复选框时，如何在android中获取相关的行数据？

时间：2015-06-25 05:37:00

标签： android listview checkbox

我有一个ListView的自定义行。在自定义行中，我有一个复选框和两个textview。就像我在Listview中有5个自定义行一样。现在我检查了第一行复选框和第二行复选框。现在我需要在另一个屏幕上显示这些已检查行的数据。 这里的片段

public class ProcessPurchaseOrder extends Activity{
HashMap<String, String> ProcessPOHashMap;
ArrayList<HashMap<String,String>> arListHashMap;
ListView processPOListView;
ProcessPOAdapter processPOAdapter;

@InjectView(R.id.processPONextBtn) protected Button procesPONxtBtn;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.process_po);
    ButterKnife.inject(this);
    procesPONxtBtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            Intent drugSupplier = new Intent(ProcessPurchaseOrder.this, DrugSupplierActivity.class);
            startActivity(drugSupplier);

        }
    });

    arListHashMap = new ArrayList<HashMap<String, String>>();
    ProcessPOHashMap = new HashMap<String, String>();
    ProcessPOHashMap.put("DrugName", "crocin");
    ProcessPOHashMap.put("QtyAvail", "300");
    ProcessPOHashMap.put("QtyOrderd", "500");
    arListHashMap.add(ProcessPOHashMap);

    ProcessPOHashMap = new HashMap<String, String>();
    ProcessPOHashMap.put("DrugName", "zintac");
    ProcessPOHashMap.put("QtyAvail", "200");
    ProcessPOHashMap.put("QtyOrderd", "400");
    arListHashMap.add(ProcessPOHashMap);

    ProcessPOHashMap = new HashMap<String, String>();
    ProcessPOHashMap.put("DrugName", "anacin");
    ProcessPOHashMap.put("QtyAvail", "400");
    ProcessPOHashMap.put("QtyOrderd", "400");
    arListHashMap.add(ProcessPOHashMap);

    ProcessPOHashMap = new HashMap<String, String>();
    ProcessPOHashMap.put("DrugName", "tapic-EM");
    ProcessPOHashMap.put("QtyAvail", "400");
    ProcessPOHashMap.put("QtyOrderd", "400");
    arListHashMap.add(ProcessPOHashMap);

    ProcessPOHashMap = new HashMap<String, String>();
    ProcessPOHashMap.put("DrugName", "omnacartil 5mg");
    ProcessPOHashMap.put("QtyAvail", "400");
    ProcessPOHashMap.put("QtyOrderd", "400");
    arListHashMap.add(ProcessPOHashMap);

    ProcessPOHashMap = new HashMap<String, String>();
    ProcessPOHashMap.put("DrugName", "maxiguard 250mg");
    ProcessPOHashMap.put("QtyAvail", "400");
    ProcessPOHashMap.put("QtyOrderd", "400");
    arListHashMap.add(ProcessPOHashMap);

    ProcessPOHashMap = new HashMap<String, String>();
    ProcessPOHashMap.put("DrugName", "c-led");
    ProcessPOHashMap.put("QtyAvail", "400");
    ProcessPOHashMap.put("QtyOrderd", "400");
    arListHashMap.add(ProcessPOHashMap);

    ProcessPOHashMap = new HashMap<String, String>();
    ProcessPOHashMap.put("DrugName", "1000 mcg");
    ProcessPOHashMap.put("QtyAvail", "400");
    ProcessPOHashMap.put("QtyOrderd", "400");
    arListHashMap.add(ProcessPOHashMap);

    ProcessPOHashMap = new HashMap<String, String>();
    ProcessPOHashMap.put("DrugName", "omikind");
    ProcessPOHashMap.put("QtyAvail", "400");
    ProcessPOHashMap.put("QtyOrderd", "400");
    arListHashMap.add(ProcessPOHashMap);

    ProcessPOHashMap = new HashMap<String, String>();
    ProcessPOHashMap.put("DrugName", "nice");
    ProcessPOHashMap.put("QtyAvail", "900");
    ProcessPOHashMap.put("QtyOrderd", "100");
    arListHashMap.add(ProcessPOHashMap);

    ProcessPOHashMap = new HashMap<String, String>();
    ProcessPOHashMap.put("DrugName", "omez");
    ProcessPOHashMap.put("QtyAvail", "400");
    ProcessPOHashMap.put("QtyOrderd", "400");
    arListHashMap.add(ProcessPOHashMap);

    ProcessPOHashMap = new HashMap<String, String>();
    ProcessPOHashMap.put("DrugName", "tellmekind 40mg");
    ProcessPOHashMap.put("QtyAvail", "400");
    ProcessPOHashMap.put("QtyOrderd", "400");
    arListHashMap.add(ProcessPOHashMap);

    ProcessPOHashMap = new HashMap<String, String>();
    ProcessPOHashMap.put("DrugName", "Amlokind-at");
    ProcessPOHashMap.put("QtyAvail", "400");
    ProcessPOHashMap.put("QtyOrderd", "400");
    arListHashMap.add(ProcessPOHashMap);

    ProcessPOHashMap = new HashMap<String, String>();
    ProcessPOHashMap.put("DrugName", "gatimac 400mg");
    ProcessPOHashMap.put("QtyAvail", "400");
    ProcessPOHashMap.put("QtyOrderd", "400");
    arListHashMap.add(ProcessPOHashMap);

    ProcessPOHashMap = new HashMap<String, String>();
    ProcessPOHashMap.put("DrugName", "nupenta-DSR");
    ProcessPOHashMap.put("QtyAvail", "400");
    ProcessPOHashMap.put("QtyOrderd", "400");
    arListHashMap.add(ProcessPOHashMap);
    processPOListView = (ListView) findViewById(R.id.processPOListView);
    processPOAdapter= new ProcessPOAdapter(ProcessPurchaseOrder.this, arListHashMap);
    processPOListView.setAdapter(processPOAdapter);

}}`

AdapterClass就在这里

public class ProcessPOAdapter extends BaseAdapter {
private Activity activity;
Activity context;
ArrayList<HashMap<String, String>> data;
HashMap<String, String> mapdata;

public ProcessPOAdapter(Activity context, ArrayList<HashMap<String, String>> data) {
    super();
    this.context = context;
    this.data = data;

}
@Override
public int getCount() {
    return data.size();
}

@Override
public Object getItem(int position) {
    return position;
}

@Override
public long getItemId(int position) {
    return position;
}

private class ViewHolder {
    CheckBox drugCheck;
    TextView drugName;
    TextView qtyAvail;
    TextView qtyOrderd;
}

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

    final ViewHolder holder;
    LayoutInflater inflater = context.getLayoutInflater();
    mapdata = new HashMap<String, String>();
    mapdata = data.get(position);
    if (convertView == null) {
        convertView = inflater.inflate(R.layout.process_po_row, null);
        holder = new ViewHolder();
        holder.drugCheck = (CheckBox) convertView.findViewById(R.id.chkBoxDrugs);
        holder.drugName = (TextView) convertView.findViewById(R.id.txtDrugValue);
        holder.qtyAvail = (TextView) convertView.findViewById(R.id.txtQtyAvailValue);
        holder.qtyOrderd = (TextView) convertView.findViewById(R.id.txtQtyOrderdValue);
        convertView.setTag(holder);


    } else {
        holder = (ViewHolder) convertView.getTag();
    }
    holder.drugName.setText(mapdata.get("DrugName"));
    holder.qtyAvail.setText(mapdata.get("QtyAvail"));
    holder.qtyOrderd.setText(mapdata.get("QtyOrderd"));
    return convertView;
}

}

2 个答案:

答案 0 :(得分：0)

首先你应该使用一个对象而不是一个地图，但这不是问题。

您需要创建对象或地图的HashSet以在您的适配器中存储已检查的项目，否则由于视图在列表中重新出现，您检查项目将在滚动时更改。

以下是使用这些更改更新的代码

public class ProcessPOAdapter extends BaseAdapter {
private Activity activity;
Activity context;
ArrayList<HashMap<String, String>> data;
HashMap<String, String> mapdata;
private HashSet<HashMap<String, String>> selectedItems = new HashSet<HashMap<String, String>>();

public ProcessPOAdapter(Activity context, ArrayList<HashMap<String, String>> data) {
    super();
    this.context = context;
    this.data = data;

}
@Override
public int getCount() {
    return data.size();
}

@Override
public Object getItem(int position) {
    return position;
}

@Override
public long getItemId(int position) {
    return position;
}

private class ViewHolder {
    CheckBox drugCheck;
    TextView drugName;
    TextView qtyAvail;
    TextView qtyOrderd;
}

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

    final ViewHolder holder;
    LayoutInflater inflater = context.getLayoutInflater();
    mapdata = new HashMap<String, String>();
    mapdata = data.get(position);
    if (convertView == null) {
        convertView = inflater.inflate(R.layout.process_po_row, null);
        holder = new ViewHolder();
        holder.drugCheck = (CheckBox) convertView.findViewById(R.id.chkBoxDrugs);
        holder.drugCheck.setOnCheckedChangeListener(listener);
        holder.drugName = (TextView) convertView.findViewById(R.id.txtDrugValue);
        holder.qtyAvail = (TextView) convertView.findViewById(R.id.txtQtyAvailValue);
        holder.qtyOrderd = (TextView) convertView.findViewById(R.id.txtQtyOrderdValue);
        convertView.setTag(holder);


    } else {
        holder = (ViewHolder) convertView.getTag();
    }
    holder.drugCheck.setTag(mapdata);//link object to retrieve it later in onCheckedChanged
    holder.drugCheck.setChecked(selectedItems.contains(mapdata));
    holder.drugName.setText(mapdata.get("DrugName"));
    holder.qtyAvail.setText(mapdata.get("QtyAvail"));
    holder.qtyOrderd.setText(mapdata.get("QtyOrderd"));
    return convertView;
}

private CompoundButton.OnCheckedChangeListener listener = new CompoundButton.OnCheckedChangeListener() {
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        mapdata = (HashMap<String, String>) buttonView.getTag();
        boolean isSelected = selectedItems.contains(mapdata);
        if(isSelected!=isChecked){ // protection to avoid updating selection when calling setChecked() from getView()
            if(isChecked){
                selectedItems.add(mapdata);
            }else{
                selectedItems.remove(mapdata);
            }
        }
    }
};

public List<HashMap<String, String>> getSelectedItems(){
    List<HashMap<String, String>> ret = new ArrayList<HashMap<String, String>>();
    for(HashMap<String, String> item : selectedItems){
        ret.add(item);
    }
    return ret;
}
}

如果使用HashMap不起作用（我不知道hashMap.equals / .hashCode实现）请尝试使用自定义objetcs。

您可以通过将所有项目添加到selectItems /清除它来选择/取消全选。你可能需要调用notifyDataSetChanged（）;为您的列表实际更新它的观点。

编辑：

将其发送到您的其他活动

 yourButton.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                Intent intent = new Intent(FirstActivity.this, SecondActivity.class);
                Bundle b = new Bundle();
                b.putSerializable("key", yourAddapter.getSelectedItems()); //Your data
                intent.putExtras(b);
                startActivity(intent);
            }
        });

并在第二个活动中检索它

Bundle b = getIntent().getExtras();
list<HashMap<String, String>> list = b.getSerializable("key");

答案 1 :(得分：0)

Try this:

public class ProcessPOAdapter extends BaseAdapter {
private Activity activity;
Activity context;
ArrayList<HashMap<String, String>> data;
HashMap<String, String> mapdata;
private HashSet<HashMap<String, String>> selectedItems = new HashSet<HashMap<String, String>>();

public ProcessPOAdapter(Activity context, ArrayList<HashMap<String, String>> data) {
    super();
    this.context = context;
    this.data = data;

}
@Override
public int getCount() {
    return data.size();
}

@Override
public Object getItem(int position) {
    return position;
}

@Override
public long getItemId(int position) {
    return position;
}

private class ViewHolder {
    CheckBox drugCheck;
    TextView drugName;
    TextView qtyAvail;
    TextView qtyOrderd;
}

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

    final ViewHolder holder;
    LayoutInflater inflater = context.getLayoutInflater();
    mapdata = new HashMap<String, String>();
    mapdata = data.get(position);
    if (convertView == null) {
        convertView = inflater.inflate(R.layout.process_po_row, null);
        holder = new ViewHolder();
        holder.drugCheck = (CheckBox) convertView.findViewById(R.id.chkBoxDrugs);
        holder.drugCheck.setOnCheckedChangeListener(listener);
        holder.drugName = (TextView) convertView.findViewById(R.id.txtDrugValue);
        holder.qtyAvail = (TextView) convertView.findViewById(R.id.txtQtyAvailValue);
        holder.qtyOrderd = (TextView) convertView.findViewById(R.id.txtQtyOrderdValue);
        convertView.setTag(holder);


    } else {
        holder = (ViewHolder) convertView.getTag();
    }
    holder.drugCheck.setTag(mapdata);//link object to retrieve it later in onCheckedChanged
     holder.drugCheck.setOnCheckedChangeListener(new CheckchangeListener(position));
    holder.drugCheck.setChecked(selectedItems.contains(mapdata));

    holder.drugName.setText(mapdata.get("DrugName"));
    holder.qtyAvail.setText(mapdata.get("QtyAvail"));
    holder.qtyOrderd.setText(mapdata.get("QtyOrderd"));
    return convertView;
}

class CheckchangeListener implements OnCheckedChangeListener {

        int position;

        public CheckchangeListener(int position) {

            this.position = position;


        }

    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        mapdata = data.get(position);
        boolean isSelected = selectedItems.contains(mapdata);
        if(isSelected!=isChecked){ // protection to avoid updating selection when calling setChecked() from getView()
            if(isChecked){
                selectedItems.add(mapdata);
            }else{
                selectedItems.remove(mapdata);
            }
        }
    }
}
}

public List<HashMap<String, String>> getSelectedItems(){
    List<HashMap<String, String>> ret = new ArrayList<HashMap<String, String>>();
    for(HashMap<String, String> item : selectedItems){
        ret.add(item);
    }
    return ret;
}
}
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