Android自定义控件通用验证码输入框的实现

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package iwangzhe.customview2.phonecode;

import android.content.Context;
import android.graphics.Color;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;
import android.widget.RelativeLayout;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

import iwangzhe.customview2.R;

/**
 * 类：PhoneCode
 * 作者： qxc
 * 日期：2018/3/14.
 */
public class PhoneCode extends RelativeLayout {
  private Context context;
  private TextView tv_code1;
  private TextView tv_code2;
  private TextView tv_code3;
  private TextView tv_code4;
  private View v1;
  private View v2;
  private View v3;
  private View v4;
  private EditText et_code;
  private List codes = new ArrayList<>();
  private InputMethodManager imm;

  public PhoneCode(Context context) {
    super(context);
    this.cOntext= context;
    loadView();
  }

  public PhoneCode(Context context, AttributeSet attrs) {
    super(context, attrs);
    this.cOntext= context;
    loadView();
  }

  private void loadView(){
    imm = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
    View view = LayoutInflater.from(context).inflate(R.layout.phone_code, this);
    initView(view);
    initEvent();
  }

  private void initView(View view){
    tv_code1 = (TextView) view.findViewById(R.id.tv_code1);
    tv_code2 = (TextView) view.findViewById(R.id.tv_code2);
    tv_code3 = (TextView) view.findViewById(R.id.tv_code3);
    tv_code4 = (TextView) view.findViewById(R.id.tv_code4);
    et_code = (EditText) view.findViewById(R.id.et_code);
    v1 = view.findViewById(R.id.v1);
    v2 = view.findViewById(R.id.v2);
    v3 = view.findViewById(R.id.v3);
    v4 = view.findViewById(R.id.v4);
  }

  private void initEvent(){
    //验证码输入
    et_code.addTextChangedListener(new TextWatcher() {
      @Override
      public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
      }
      @Override
      public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
      }
      @Override
      public void afterTextChanged(Editable editable) {
        if(editable != null && editable.length()>0) {
          et_code.setText("");
          if(codes.size() <4){
            codes.add(editable.toString());
            showCode();
          }
        }
      }
    });
    // 监听验证码删除按键
    et_code.setOnKeyListener(new View.OnKeyListener() {
      @Override
      public boolean onKey(View view, int keyCode, KeyEvent keyEvent) {
        if (keyCode == KeyEvent.KEYCODE_DEL && keyEvent.getAction() == KeyEvent.ACTION_DOWN && codes.size()>0) {
          codes.remove(codes.size()-1);
          showCode();
          return true;
        }
        return false;
      }
    });
  }

  /**
   * 显示输入的验证码
   */
  private void showCode(){
    String code1 = "";
    String code2 = "";
    String code3 = "";
    String code4 = "";
    if(codes.size()>=1){
      code1 = codes.get(0);
    }
    if(codes.size()>=2){
      code2 = codes.get(1);
    }
    if(codes.size()>=3){
      code3 = codes.get(2);
    }
    if(codes.size()>=4){
      code4 = codes.get(3);
    }
    tv_code1.setText(code1);
    tv_code2.setText(code2);
    tv_code3.setText(code3);
    tv_code4.setText(code4);    
    
    setColor();//设置高亮颜色
    callBack();//回调
  }

  /**
   * 设置高亮颜色
   */
  private void setColor(){
    int color_default = Color.parseColor("#999999");
    int color_focus = Color.parseColor("#3F8EED");
    v1.setBackgroundColor(color_default);
    v2.setBackgroundColor(color_default);
    v3.setBackgroundColor(color_default);
    v4.setBackgroundColor(color_default);
    if(codes.size()==0){
      v1.setBackgroundColor(color_focus);
    }
    if(codes.size()==1){
      v2.setBackgroundColor(color_focus);
    }
    if(codes.size()==2){
      v3.setBackgroundColor(color_focus);
    }
    if(codes.size()>=3){
      v4.setBackgroundColor(color_focus);
    }
  }

  /**
   * 回调
   */
  private void callBack(){
    if(OnInputListener==null){
      return;
    }
    if(codes.size()==4){
      onInputListener.onSucess(getPhoneCode());
    }else{
      onInputListener.onInput();
    }
  }

  //定义回调
  public interface OnInputListener{
    void onSucess(String code);
    void onInput();
  }
  private OnInputListener onInputListener;
  public void setOnInputListener(OnInputListener onInputListener){
    this.OnInputListener= onInputListener;
  }

  /**
   * 显示键盘
   */
  public void showSoftInput(){
    //显示软键盘
    if(imm!=null && et_code!=null) {
      et_code.postDelayed(new Runnable() {
        @Override
        public void run() {
          imm.showSoftInput(et_code, 0);
        }
      },200);
    }
  }

  /**
   * 获得手机号验证码
   * @return 验证码
   */
  public String getPhoneCode(){
    StringBuilder sb = new StringBuilder();
    for (String code : codes) {
      sb.append(code);
    }
    return sb.toString();
  }
}

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package iwangzhe.customview2;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import iwangzhe.customview2.phonecode.PhoneCode;
public class MainActivity extends AppCompatActivity {
  PhoneCode pc_1;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    pc_1 = (PhoneCode) findViewById(R.id.pc_1);
    //注册事件回调（可写，可不写）
    pc_1.setOnInputListener(new PhoneCode.OnInputListener() {
      @Override
      public void onSucess(String code) {
        //TODO:
      }

      @Override
      public void onInput() {
        //TODO:
      }
    });
  }

  private void test(){
    //获得验证码
    String phOneCode= pc_1.getPhoneCode();
  }
}