Question

我正在尝试制作一个活动，提供紧急电话号码列表，用户可以添加自己的自定义条目并保存。出于某种原因，ListView不会出现在活动上。我很确定我在CustomAdapter类中做错了，我在ListView的每个段中都有两个文本框。

我还尝试设置listView以使用所触摸的任何片段的电话号码开始电话活动，并且我不确定我是否正确地执行此操作。

PhoneList.java：

public class PhoneList extends AppCompatActivity {

    ArrayList<String> customList;
    ArrayList<String> numList;
    Bundle b;
    TinyDB tinydb;
    CustomAdapter dataAdapter;
    ListView phoneListView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_phone_list);
        phoneListView = (ListView)findViewById(R.id.listViewPhone);
        Integer num = null;
        String label = "";
        customList = null;
        numList = null;
        tinydb = new TinyDB(this);
        Button saveContact = (Button)(findViewById(R.id.button4));

        b = new Bundle();


        customList = tinydb.getListString("label");
        ArrayList<Integer> temp = tinydb.getListInt("num");
        for(int i = 0; i < temp.size(); i++){
            numList.add(temp.get(i).toString());
        }


        saveContact.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                EditText enteredLabel = (EditText)findViewById(R.id.editText2);
                EditText enteredNum = (EditText)findViewById(R.id.editText);
                String label = enteredLabel.getText().toString();
                Integer num = Integer.parseInt(enteredNum.getText().toString());
                b.putString("label",label);
                b.putInt("num",num);
                addPhoneItem();


            }
        });


        ArrayList<String> phoneList = new ArrayList<>();
        phoneList.add("Emergencies");
        phoneList.add("Travel Info ");
        phoneList.add("Poison Control ");
        phoneList.add("AAA: 1(800)836-2582");
        if(customList != null && customList.size() > 0) phoneList.addAll(customList);

        ArrayList<String> numberList = new ArrayList<>();
        numberList.add("911");
        numberList.add("511");
        numberList.add("18002221222");
        numberList.add("18008362582");
        if(numList != null && numList.size()>0) {
            for (int i = 0; i < numList.size(); i++) {
                numberList.add(numList.get(i).toString());
            }
        }



        dataAdapter = new CustomAdapter(this,numberList,phoneList);
        phoneListView.setAdapter(dataAdapter);


    }
    public void addPhoneItem(){
        customList.add(b.getString("label"));
        numList.add(b.getString("num"));
        tinydb.putListString("label",customList);
        tinydb.putListString("num",numList);
        dataAdapter = new CustomAdapter(this,numList,customList);
        phoneListView.setAdapter(dataAdapter);

    }
    private class CustomAdapter extends ArrayAdapter<String> {
        ArrayList<String> labels;
        ArrayList<String> nums;
        Context context;

        public CustomAdapter(Context context, ArrayList<String> n,ArrayList<String> l) {
            super(context,R.layout.phone_item);
            this.context = context;
            labels = new ArrayList<String>();
            labels.addAll(l);
            nums = new ArrayList<String>();
            nums.addAll(n);
        }

        @Override
        public View getView(final int position, View convertView, ViewGroup parent) {
            try {
                ViewHolder holder = null;
                if (convertView == null) {
                    LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                    convertView = vi.inflate(R.layout.phone_item, null);
                    holder = new ViewHolder();
                    holder.viewLabel = (TextView) convertView.findViewById(R.id.editText);
                    holder.viewNumber = (TextView) convertView.findViewById(R.id.editText2);
                    convertView.setTag(holder);


                } else {
                    holder = (ViewHolder) convertView.getTag();
                }

                String label = labels.get(position);
                String num = nums.get(position);
                holder.viewLabel.setText(label);
                holder.viewNumber.setText(num);
                holder.viewNumber.setTag(num);
                holder.viewNumber.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        String str = "tel:" + (EditText) v.getTag();
                        Intent intent = new Intent(Intent.ACTION_CALL);
                        intent.setData(Uri.parse(str));
                        try {
                            startActivity(intent);
                        } catch (Exception e) {
                            Toast.makeText(getContext(),"Exception Caught in CustomAdapter",Toast.LENGTH_SHORT).show();
                        }
                    }
                });



            }
            catch(Exception e){
                Toast.makeText(getContext(),"Exception caught",Toast.LENGTH_SHORT).show();

            }
            return convertView;

        }

    }
    private class ViewHolder{
        TextView viewLabel;
        TextView viewNumber;
    }
}

activity_phone_list.xml：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res``/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.rvtripapp.dempsey.rvtripapp.PhoneList">

<ListView
    android:layout_width="wrap_content"
    android:layout_height="400dp"
    android:id="@+id/listViewPhone"
    android:layout_alignParentBottom="true"
    android:layout_alignParentRight="true"
    android:layout_alignParentEnd="true" />

<EditText
    android:layout_width="200dp"
    android:layout_height="wrap_content"
    android:id="@+id/editText"
    android:layout_alignParentTop="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:editable="true"
    android:hint="Label" />

<EditText
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:inputType="number"
    android:ems="10"
    android:id="@+id/editText2"
    android:layout_below="@+id/editText"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:hint="Phone Number" />

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="+"
    android:id="@+id/button4"
    android:textSize="40dp"
    android:background="#44fe66"
    android:layout_alignBottom="@+id/editText2"
    android:layout_alignRight="@+id/listView"
    android:layout_alignEnd="@+id/listView" />
</RelativeLayout>

phone_item.xml：

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

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="New Text"
    android:id="@+id/textView2" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="New Text"
    android:id="@+id/textView3" />
</LinearLayout>

非常感谢任何帮助，谢谢。

Answer 1

将超级关键字行更改为

    super(context,R.layout.phone_item, n);

Answer 2

您是否尝试覆盖CustomAdapter类的getCount方法？

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

Answer 3

您正在onCreate（）之外设置自定义适配器，尝试将其设置在onCreate（）中。

ListView没有出现

3 个答案: