在列表中显示来自editText的用户输入查看usinng arrayAdapter

Question

我希望我的应用在listView中显示editText的用户输入。我已经尝试过使用setText方法，但是问题是所需的args是字符串，而我传递的是editText。那么我该怎么做才能传递editText。

MY mainActivity类         包com.example.manuj.autocalc;

    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.widget.ArrayAdapter;
    import android.widget.EditText;
    import android.widget.ListView;

    import java.util.ArrayList;

    public class MainActivity extends AppCompatActivity {

        EditText editTotal;
        EditText editItem;
        EditText editAmt;
        ListView listView;
        CustomAdapter customAdapter;

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

            editItem=findViewById(R.id.itemEdit);
            editTotal=findViewById(R.id.editTotal);
            editAmt=findViewById(R.id.amtEdit);

            final ArrayList<Calc> calcs=new ArrayList<>();
            listView=findViewById(R.id.listView);
            customAdapter=new CustomAdapter(this,-1,calcs);
            listView.setAdapter(customAdapter);
            Calc calc=new Calc(editItem.getText().toString(),editAmt.getText().toString(),editTotal.getText().toString());
            calcs.add(calc);
            customAdapter.notifyDataSetChanged();


        }
    }

这是我的适配器类

    package com.example.manuj.autocalc;

    import android.content.Context;
    import android.support.annotation.NonNull;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.ArrayAdapter;
    import android.widget.EditText;

    import java.util.ArrayList;


    public class CustomAdapter extends ArrayAdapter<Calc> {
        public CustomAdapter(Context context, int resource, ArrayList<Calc> calcs) {
            super(context, resource, calcs);
        }
        @Override
        public View getView(int position, View view, ViewGroup parent) {

            Calc calc = getItem(position);

            if (view == null){
                view = LayoutInflater.from(getContext()).inflate(
                        R.layout.list_item, parent, false);
            }

            //get and set the items
            EditText item=(EditText)view.findViewById(R.id.itemEdit);
            item.setText(calc.getmItemEdit());

            //get and set the amt
            EditText amt=view.findViewById(R.id.amtEdit);
            amt.setText(calc.getmAmtEdit());

            //get and set the totalAmt
            EditText total=view.findViewById(R.id.editTotal);
            total.setText(calc.getmTotalEdt());

            return view;
        }
    }


    **This is my model class**
    package com.example.manuj.autocalc;


    import android.widget.EditText;

    public class Calc {
        private String mItemEdit;
        private String mTotalEdt;
        private String mAmtEdit;

        Calc(String itemEdit,String totalEdit,String amtEdit){
            this.mItemEdit=itemEdit;
            this.mTotalEdt=totalEdit;
            this.mAmtEdit=amtEdit;

        }


        public String getmItemEdit(){return mItemEdit;}

        public String getmTotalEdt(){return mTotalEdt;}

        public String getmAmtEdit(){return mAmtEdit;}
    }

Answer 1

您的Calc类构造函数需要3个字符串：

Calc calc=new Calc(editItem.getText().toString(),editTotal.getText().toString(),editAmt.getText().toString());

Answer 2

您可以通过

(your edittext).getText().toString()

作为您对setText的论点。

您还可以尝试像这样使用textchangedlistener：

示例代码可自行更改：

EditText searchTo = (EditText)findViewById(R.id.medittext);
searchTo.addTextChangedListener(new TextWatcher() {
    @Override
    public void afterTextChanged(Editable s) {
        // TODO Auto-generated method stub
    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        // TODO Auto-generated method stub
    }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
        doSomething();
    } 
});

将计算结果放入onTextChanged中，但放在最后一个接受用户输入的edittext中，例如您的应用从用户那里输入2个输入（可能是edittext1和edittext2），将textchangedlistener放置在edittext2处，否则将返回null再次例外

希望这会有所帮助！

Answer 3

在适配器类中使用此代码

 package com.example.manuj.autocalc;

    import android.content.Context;
    import android.support.annotation.NonNull;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.ArrayAdapter;
    import android.widget.EditText;

    import java.util.ArrayList;


    public class CustomAdapter extends ArrayAdapter<Calc> {
        public CustomAdapter(Context context, int resource, ArrayList<Calc> calcs) {
            super(context, resource, calcs);
        }
        @Override
        public View getView(int position, View view, ViewGroup parent) {

            Calc calc = getItem(position);

            if (view == null){
                view = LayoutInflater.from(getContext()).inflate(
                        R.layout.list_item, parent, false);
            }

            //get and set the items
            EditText item=(EditText)view.findViewById(R.id.itemEdit);
            item.setText(calc.getmItemEdit().getText().toString());

            //get and set the amt
            EditText amt=view.findViewById(R.id.amtEdit);
            amt.setText(calc.getmAmtEdit().getText().toString());

            //get and set the totalAmt
            EditText total=view.findViewById(R.id.editTotal);
            total.setText(calc.getmTotalEdt().getText().toString());

            return view;
        }
    }


    **This is my model class**
    package com.example.manuj.autocalc;


    import android.widget.EditText;

    public class Calc {
        private String mItemEdit;
        private String mTotalEdt;
        private String mAmtEdit;

        Calc(String itemEdit,String totalEdit,String amtEdit){
            this.mItemEdit=itemEdit;
            this.mTotalEdt=totalEdit;
            this.mAmtEdit=amtEdit;

        }


        public String getmItemEdit(){return mItemEdit;}

        public String getmTotalEdt(){return mTotalEdt;}

        public String getmAmtEdit(){return mAmtEdit;}
    }