EditText方框验证码

项目中有这样一个需求：
验证码页是四个方框，输入验证码方框颜色改变，删除再变回原来颜色。

效果.gif

思路：
1.用一个透明的EditText与四个TextView重叠，并给TextView设置默认背景
2.监听EditText文本变化，获取输入内容，给TextView赋值并改变TextView背景
3. 4个TextView有值后添加输入完成回调，监听删除键添加删除回调

代码：

private EditText editText;
private TextView[] TextViews;
private StringBuffer stringBuffer = new StringBuffer();
private int count = 4;
private String inputContent;

public SecurityCodeView(Context context) {
    this(context, null);
}

public SecurityCodeView(Context context, AttributeSet attrs) {
    this(context, attrs, 0);
}

public SecurityCodeView(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    TextViews = new TextView[4];
    View.inflate(context, R.layout.view_security_code, this);

    editText = (EditText) findViewById(R.id.item_edittext);
    TextViews[0] = (TextView) findViewById(R.id.item_code_iv1);
    TextViews[1] = (TextView) findViewById(R.id.item_code_iv2);
    TextViews[2] = (TextView) findViewById(R.id.item_code_iv3);
    TextViews[3] = (TextView) findViewById(R.id.item_code_iv4);

    editText.setCursorVisible(false);//将光标隐藏
    setListener();
}

private void setListener() {
    editText.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) {
         // 如果字符不为""时才进行操作
            if (!editable.toString().equals("")) {
                if (stringBuffer.length() > 3) {
                    //当文本长度大于3位时edittext置空
                    editText.setText("");
                    return;
                } else {
                    //将文字添加到StringBuffer中
                    stringBuffer.append(editable);
                    editText.setText("");//添加后将EditText置空  
                    count = stringBuffer.length();//记录stringbuffer的长度
                    inputContent = stringBuffer.toString();
                    if (stringBuffer.length() == 4) {
                        //文字长度位4  则调用完成输入的监听
                        if (inputCompleteListener != null) {
                            inputCompleteListener.inputComplete();
                        }
                    }
                }

                for (int i = 0; i < stringBuffer.length(); i++) {
                    TextViews[i].setText(String.valueOf(inputContent.charAt(i)));
                    TextViews[i].setBackgroundResource(R.mipmap.bg_verify_press);
                }

            }
        }
    });

    editText.setOnKeyListener(new OnKeyListener() {
        @Override
        public boolean onKey(View v, int keyCode, KeyEvent event) {
            if (keyCode == KeyEvent.KEYCODE_DEL
                    && event.getAction() == KeyEvent.ACTION_DOWN) {
                if (onKeyDelete()) return true;
                return true;
            }
            return false;
        }
    });
}


public boolean onKeyDelete() {
    if (count == 0) {
        count = 4;
        return true;
    }
    if (stringBuffer.length() > 0) {
        //删除相应位置的字符
        stringBuffer.delete((count - 1), count);
        count--;
        inputContent = stringBuffer.toString();
        TextViews[stringBuffer.length()].setText("");
        TextViews[stringBuffer.length()].setBackgroundResource(R.mipmap.bg_verify);
        if (inputCompleteListener != null)
            inputCompleteListener.deleteContent(true);//有删除就通知manger

    }
    return false;
}

/**
 * 清空输入内容
 */
public void clearEditText() {
    stringBuffer.delete(0, stringBuffer.length());
    inputContent = stringBuffer.toString();
    for (int i = 0; i < TextViews.length; i++) {
        TextViews[i].setText("");
        TextViews[i].setBackgroundResource(R.mipmap.bg_verify);
    }
}

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    return super.onKeyDown(keyCode, event);
}

private InputCompleteListener inputCompleteListener;

public void setInputCompleteListener(InputCompleteListener inputCompleteListener) {
    this.inputCompleteListener = inputCompleteListener;
}

public interface InputCompleteListener {
    void inputComplete();

    void deleteContent(boolean isDelete);
}

/**
 * 获取输入文本
 *
 * @return
 */
public String getEditContent() {
    return inputContent;
}

布局

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

<LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="47dp"
    android:gravity="center"
    android:orientation="horizontal"
    android:weightSum="3">


    <TextView
        android:id="@+id/item_code_iv1"
        style="@style/text_editStyle" />

    <View
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1" />

    <TextView
        android:id="@+id/item_code_iv2"
        style="@style/text_editStyle" />

    <View
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1" />

    <TextView
        android:id="@+id/item_code_iv3"
        style="@style/text_editStyle" />

    <View
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1" />

    <TextView
        android:id="@+id/item_code_iv4"
        style="@style/text_editStyle" />


</LinearLayout>

<EditText
    android:id="@+id/item_edittext"
    android:layout_width="match_parent"
    android:layout_height="46dp"
    android:background="@android:color/transparent"
    android:inputType="number" />

</RelativeLayout>

使用：

    <com.xiaviv.securitycodedemo.SecurityCodeView
    android:id="@+id/scv_edittext"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="center_horizontal"
    android:layout_marginLeft="20dp"
    android:layout_marginRight="20dp"
    android:layout_marginTop="20dp" />


<TextView
    android:id="@+id/tv_text"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginLeft="20dp"
    android:layout_marginRight="20dp"
    android:layout_marginTop="10dp"
    android:layout_weight="4"
    android:text="输入验证码表示同意《用户协议》" />

   public class MainActivity extends AppCompatActivity implements SecurityCodeView.InputCompleteListener {

    private SecurityCodeView editText;
    private TextView text;

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

    findViews();
    setListener();
  }

    private void setListener() {
    editText.setInputCompleteListener(this);
  }

    private void findViews() {
    editText = (SecurityCodeView) findViewById(R.id.scv_edittext);
    text = (TextView) findViewById(R.id.tv_text);
  }

    @Override
    public void inputComplete() {
        Toast.makeText(getApplicationContext(), "验证码是：" + editText.getEditContent(), Toast.LENGTH_LONG).show();
        if (!editText.getEditContent().equals("1234")) {
        text.setText("验证码输入错误");
        text.setTextColor(Color.RED);
      }
  }

    @Override
    public void deleteContent(boolean isDelete) {
        if (isDelete){
        text.setText("输入验证码表示同意《用户协议》");
        text.setTextColor(Color.BLACK);
      }
  }
}          

Demo地址：https://github.com/xiaviv/SecurityCodeDemo