效果图:

[（
1）]

源码地址(github)

最近开发项目需要自定义收银键盘，网上查了查都感觉不是太好，于是自己写了一个，自定义的键盘主要是根据GridView+EditText结合来写的.

1.GridView如下：

<GridView
            android:inputType="numberDecimal"
            android:editable="false"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:numColumns="4"
            android:layout_weight="1"
            android:id="@+id/gridview"></GridView>

2.然后自己写了一个PayKeyAdapter，设置了键盘的文字和类型。

package com.example.qzs.keyboard_cash;

import android.content.Context;
import android.graphics.Color;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;


public class PayKeyAdapter extends BaseAdapter {
    private Context mContext;
    
    private Context context;  
       
     public PayKeyAdapter(Context context) {  
         this.context=context;  
     }  
       
     private String[] texts = {  
       //九宫格图片下方文字的设置  
       "1",  
       "2",  
       "3",  
       "清空",
       "4",  
       "5",  
       "6",  
       "←",
       "7",  
       "8",  
       "9",  
       "=",
       ".",  
       "0",
       "+",
       "收款",
       }; 
     
     private String[] types = {  
       //存放在text的tag中
       "num",  
       "num",  
       "num",  
       "cancel",
       "num",  
       "num",  
       "num",  
       "back",
       "num",  
       "num",  
       "num",  
       "equal",
       "point",  
       "num",
       "plus",
       "pay",
     };
     
     @Override  
     public int getCount() {  
      return texts.length;  
     }  
     
     @Override  
     public Object getItem(int position) {  
      return position;  
     }  
     
     @Override  
     public long getItemId(int position) {  
      return position;  
     }  
     
     @Override  
     public View getView(int position, View view, ViewGroup viewgroup) {  
      ImgTextWrapper wrapper;  
      if(view==null) {  
       wrapper = new ImgTextWrapper();  
       LayoutInflater inflater = LayoutInflater.from(context);  
       view = inflater.inflate(R.layout.grid_menu_item_pay, null);
       view.setTag(wrapper);  
       view.setPadding(3, 3, 3, 3);  //每格的间距  
      } else {  
       wrapper = (ImgTextWrapper)view.getTag();  
      }  
        
      wrapper.textView = (TextView)view.findViewById(R.id.GridTextView);
      wrapper.textView.setText(texts[position]);  
      wrapper.textView.setTag(types[position]);
      if(types[position].equals("back")
              || types[position].equals("cancel")
              || types[position].equals("equal")){
          wrapper.textView.setBackgroundResource(R.drawable.btn_cell_delete);
      }else if(types[position].equals("pay")){
          wrapper.textView.setBackgroundResource(R.drawable.btn_cell_pay);
          wrapper.textView.setTextColor(Color.WHITE);
      }
              
//      wrapper.textView = (TextView)view.findViewById(R.id.GridItemText);  
//      wrapper.textView.setText(texts[position]);
//      wrapper.textView.setTag(payTypes[position]);
        
      return view;  
     }  
     
     class ImgTextWrapper {  
         ImageView imageView;  
         TextView textView;  
     } 
}

3.核心的语法在GridView的setOnItemClickListener事件.

     gridview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                String keyType = view.findViewById(R.id.GridTextView).getTag().toString();
                String textValue = ((TextView)view.findViewById(R.id.GridTextView)).getText().toString();
                String editText = editMemberAmount.getText().toString();


                if(keyType.equals("num")){
                    //数字键
                    try{
                        String orgValue = numList.get(numIndex);
                        if(editText.equals("0")){
                            editMemberAmount.setText(textValue);
                        }else{
                            //小数点最多只能后两位
                            if(orgValue.equals("0.00")){
                                orgValue=textValue;
                                numList.set(numIndex, textValue);
                                editMemberAmount.setText(textValue);
                                return;
                            }
                            if(orgValue.lastIndexOf(".")!=-1 && orgValue.lastIndexOf(".")<orgValue.length()-2){
                                Toast.makeText(getApplicationContext(),"只能输入小数点后两位",Toast.LENGTH_SHORT).show();
                            }else{
                                if(editText.length()>=18){
                                    Toast.makeText(getApplicationContext(),"一次输入算式无法超过18个字符",Toast.LENGTH_SHORT).show();
                                    return;
                                }
                                int numLen = orgValue.length();
                                if(orgValue.lastIndexOf(".")!=-1){
                                    numLen = orgValue.lastIndexOf(".")+1;
                                }
                                if(numLen==7){
                                    Toast.makeText(getApplicationContext(),"收款金额不能超过7位数",Toast.LENGTH_SHORT).show();
                                }else{
                                    numList.set(numIndex, orgValue+textValue);
                                    editMemberAmount.setText(editText+textValue);
                                }
                            }
                        }
                    }catch(Exception e){
                        numIndex=0;
                        numList=new ArrayList<String>();
                        numList.add(textValue);
                        editMemberAmount.setText(textValue);
                    }
                }
                if(keyType.equals("back")){
                    //退格
                    try{
                        if(editText.lastIndexOf("+") == editText.length()-1){
                            //最后为加则减少一位
                            numList.set(numIndex,"");
                            numIndex--;
                            editMemberAmount.setText(editText.substring(0,editText.length()-1));
                        }else{
                            String orgValue = numList.get(numIndex);
                            if(!orgValue.equals("")){
                                numList.set(numIndex, orgValue.substring(0,orgValue.length()-1));
                            }
                            if(editText.equals("0")||editText.length()==1){
                                editMemberAmount.setText("0.00");
                                numList.set(numIndex,"0.00");
                            }else{
                                editMemberAmount.setText(editText.substring(0,editText.length()-1));
                            }
                        }
                    }catch(Exception e){
                        numIndex=0;
                        numList=new ArrayList<String>();
                        numList.add("0");
                        editMemberAmount.setText("");
                    }
                }
                if(keyType.equals("point")){
                    //小数点
                    try{
                        String orgValue = numList.get(numIndex);
                        if(orgValue.lastIndexOf(".")!=-1){
                            Toast.makeText(getApplicationContext(),"已存在小数点",Toast.LENGTH_SHORT).show();
                        }else{
                            if(editText.lastIndexOf("+") == editText.length()-1){
                                //最后为加则补0
                                numList.set(numIndex, orgValue+"0"+textValue);
                                editMemberAmount.setText(editText+"0"+textValue);
                            }else{
                                numList.set(numIndex, orgValue+textValue);
                                editMemberAmount.setText(editText+textValue);
                            }
                        }
                    }catch(Exception e){
                        numIndex=0;
                        numList=new ArrayList<String>();
                        numList.add("0.");
                        editMemberAmount.setText("0.");
                    }
                }
                if(keyType.equals("plus")){
                    //加
                    try{
                        if(editText.lastIndexOf("+") == editText.length()-1){
                            //最后为加则不处理

                        }else{
                            numIndex++;
                            numList.add("");
                            editMemberAmount.setText(editText+textValue);
                        }
                    }catch(Exception e){
                        numIndex=0;
                        numList=new ArrayList<String>();
                        numList.add("0");
                        editMemberAmount.setText("");
                    }
                }
                if(keyType.equals("cancel")){
                    //清空
                    //确认是否清空
                    AlertDialog.Builder clearBuilder = new AlertDialog.Builder(MainActivity.this);// 添加按钮的单击事件
                    clearBuilder.setMessage("是否确认要清空当前收款数据?")
                            . // 设置确定按钮
                            setPositiveButton("确定",
                            new DialogInterface.OnClickListener() {
                                // 单击事件
                                public void onClick(
                                        DialogInterface dialog,
                                        int which) { // 设置TextView文本
                                    clearInputData();
                                }
                            })
                            . // 设置取消按钮
                            setNegativeButton("取消",
                            new DialogInterface.OnClickListener() {
                                public void onClick(
                                        DialogInterface dialog,
                                        int which) {

                                }
                            }); // 创建对话框
                    AlertDialog ad = clearBuilder.create(); // 显示对话框
                    ad.show();
                }
                if(keyType.equals("equal")||keyType.equals("pay")){
                    //等于
                    try{
                        double sum = 0.0;
                        for(String value :numList){
                            if(!value.equals("")){
                                sum+= Double.parseDouble(value)+0.00d;
                            }
                        }

                        String sumStr=new DecimalFormat("##.##").format(sum);
                        if(!sumStr.contains(".")){
                            sumStr+=".00";
                        }
                        if(sumStr.substring(sumStr.lastIndexOf(".")+1).length()<2){
                            sumStr+="0";
                        }

                        numIndex=0;
                        numList=new ArrayList<String>();
                        numList.add(sumStr);
                        editMemberAmount.setText(sumStr);
                    }catch(Exception e){
                        numIndex=0;
                        numList=new ArrayList<String>();
                        numList.add("0");
                        editMemberAmount.setText("");
                    }
                }
                if(keyType.equals("pay")){
                    //收款
                    if (editMemberAmount.getText().toString().length() < 1||editMemberAmount.getText().toString().equals("0.00") || editMemberAmount.getText().toString().equals("0")) {
                        Toast.makeText(getApplicationContext(),"请输入金额",Toast.LENGTH_SHORT).show();
                        return;
                    }else {
                        Toast.makeText(getApplicationContext(),"收款成功",Toast.LENGTH_SHORT).show();
                    }


                }
            }
        });

4.具体的完整项目请访问我的github，地址在上方已贴出.
我的公众号如下: