详谈自定义View之GridView单选金额选择Layout-ChooseMoneyLayout

public class ChooseMoneyLayout extends GridView {
 
  private int[] mOneyList= {};  //数据源
 
  private LayoutInflater mInflater; 
 
  private MyAdapter adapter;  //适配器
 
  int defaultChoose = 0;   //默认选中项
 
  public ChooseMoneyLayout(Context context, AttributeSet attrs) {
    super(context, attrs);
    setData();
  }
 
  public void setData() {
    mInflater = LayoutInflater.from(getContext());
    //配置适配器
    adapter = new MyAdapter();
    setAdapter(adapter);
  }
 
  /**
   * 设置默认选择项目，
   * @param defaultChoose
   */
  public void setDefaultPositon(int defaultChoose) {
    this.defaultChoose = defaultChoose;
    adapter.notifyDataSetChanged();
  }
 
  /**
   * 设置数据源
   * @param moneyData
   */
  public void setMoneyData(int[] moneyData){
    this.mOneyList= moneyData;
  }
 
  class MyAdapter extends BaseAdapter {
 
 
    private CheckBox checkBox;
 
 
    @Override
    public int getCount() {
      return moneyList.length;
    }
 
    @Override
    public Object getItem(int position) {
      return moneyList[position];
    }
 
    @Override
    public long getItemId(int position) {
      return position;
    }
 
    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
      MyViewHolder holder;
      if (cOnvertView== null) {
        holder = new MyViewHolder();
        cOnvertView= mInflater.inflate(R.layout.item_money_pay, parent, false);
        holder.mOneyPayCb= (CheckBox) convertView.findViewById(R.id.money_pay_cb);
        convertView.setTag(holder);
      } else {
        holder = (MyViewHolder) convertView.getTag();
      }
 
      holder.moneyPayCb.setText(getItem(position) + "元");
 
      holder.moneyPayCb.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
          if (isChecked) {
            //设置选中文字颜色
            buttonView.setTextColor(getResources().getColor(R.color.light_color_blue));
 
            //取消上一个选择
            if (checkBox != null) {
              checkBox.setChecked(false);
            }
            checkBox = (CheckBox) buttonView;
          } else {
            checkBox = null;
            //设置不选中文字颜色
            buttonView.setTextColor(getResources().getColor(R.color.darkgray));
          }
          //回调
          listener.chooseMoney(position, isChecked, (Integer) getItem(position));
        }
      });
 
 
      if (position == defaultChoose) {
        defaultChoose = -1; 
        holder.moneyPayCb.setChecked(true);
        checkBox = holder.moneyPayCb;
      }
 
      return convertView;
    }
 
 
    private class MyViewHolder {
      private CheckBox moneyPayCb;
    }
  }
 
 
  /**
   * 解决嵌套显示不完
   * @param widthMeasureSpec
   * @param heightMeasureSpec
   */
  @Override
  public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
 
    int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,
        MeasureSpec.AT_MOST);
    super.onMeasure(widthMeasureSpec, expandSpec);
  }
 
  private onChoseMoneyListener listener;
 
  public void setOnChoseMoneyListener(onChoseMoneyListener listener) {
    this.listener = listener;
  }
 
  public interface onChoseMoneyListener {
    /**
     * 选择金额返回
     *
     * @param position gridView的位置
     * @param isCheck 是否选中
     * @param moneyNum 钱数
     */
    void chooseMoney(int position, boolean isCheck, int moneyNum);
  }
}

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private ChooseMoneyLayout moneyChoseMoney;
  private int money; //当前选择的金额
 
  private void initData() {
    //获取控件
    mOneyChoseMoney= (ChooseMoneyLayout)findViewById(R.id.money_chose_money);
    //数设置据源
    moneyChoseMoney.setMoneyData(new int[]{30, 50, 100, 200, 300, 500,1000});
    //设置默认选中项
    moneyChoseMoney.setDefaultPositon(3);
    //金额选择监听
    moneyChoseMoney.setOnChoseMoneyListener(new ChooseMoneyLayout.onChoseMoneyListener() {
      @Override
      public void chooseMoney(int position,boolean isCheck, int moneyNum) {
        if(isCheck){
          mOney= moneyNum;
          ToastUtil.showCustomToast(PayActivity.this,money+"");
        }else{
          mOney= 0;
        }
      }
    });
 
  }