Android Verification Code View

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="VerificationCodeView">
        <attr name="vcodeTextSize" format="dimension" />
        <attr name="vcodeTextColor" format="color" />
        <attr name="vcodeBottomIcon" format="reference" />
        <attr name="vcodeViewCount" format="integer" />
        <attr name="vcodeItemSpaceSize" format="dimension" />
    </declare-styleable>
</resources>

<resources>
    <dimen name="default_text_size" >18sp</dimen>
    <dimen name="vcode_text_size" >18sp</dimen>
    <dimen name="vcode_bottom_icon_height">6dp</dimen>
    <dimen name="vcode_bottom_icon_width">48dp</dimen>
    <dimen name="vcode_item_space_size">19dp</dimen>

	<color name="vcode_bottom_icon_bg">#f6a500</color>
	<color name="vcode_bottom_error_icon_bg">#e84849</color>
	<color name="vcode_text_color">#000000</color>
</resources>

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">
    <corners android:radius="90dp" />
    <solid android:color="@color/vcode_bottom_icon_bg" />
    <size
        android:height="@dimen/vcode_bottom_icon_height"
        android:width="@dimen/vcode_bottom_icon_width" />
</shape>

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">
    <corners android:radius="90dp" />
    <solid android:color="@color/vcode_bottom_error_icon_bg" />
    <size
        android:height="@dimen/vcode_bottom_icon_height"
        android:width="@dimen/vcode_bottom_icon_width" />
</shape>

import android.graphics.drawable.Drawable;
import android.widget.EditText;
import android.widget.TextView;

/**
 * Created by Victor Yang on 2016/12/15 0015.
 * TextViewUtils.
 */

public class TextViewUtils {

    public static void addTextViewLeftIcon(
            EditText editText
            , Drawable drawable
            , int imgSize) {

        if (editText == null || drawable == null || imgSize <= 0) {
            return;
        }

        drawable.setBounds(0, 0
                , imgSize
                , imgSize);

        editText.setCompoundDrawables(
                drawable
                , null
                , null
                , null);
    }

    public static void addTextViewBottomIcon(
            TextView textView
            , Drawable drawable
            , int imgWidth
            , int imgHeight) {

        if (textView == null || drawable == null || imgWidth <= 0) {
            return;
        }

        drawable.setBounds(0, 0
                , imgWidth
                , imgHeight);

        textView.setCompoundDrawables(
                null
                , null
                , null
                , drawable);
    }
}

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.drawable.Drawable;
import android.text.InputType;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.inputmethod.BaseInputConnection;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputConnection;
import android.view.inputmethod.InputMethodManager;
import android.widget.LinearLayout;
import android.widget.TextView;

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

/**
 * Created by Victor Yang on 2016/12/19 0019.
 * 验证码 view
 */

public class VerificationCodeView extends LinearLayout {

    public interface CodeCompleteListener{
        void complete(boolean complete);
    }

    // 验证码 text size
    private float mVCodeTextSize;

    // 验证码 text color
    private int mVCodeTextColor;

    // 验证码 底部 icon
    private Drawable mVCodeBottomIcon;
    private Drawable mVCodeBottomErrorIcon;

    // 验证码 item 之间的空隙
    private int mVCodeItemCenterSpaceSize;

    // 存储键盘的输入数字
    private StringBuilder mCodeStringBuilder;

    // 存储 验证码 item
    private List<TextView> mCodeViewList;

    // 验证码 输入完成 的监听
    private CodeCompleteListener mCodeCompleteListener;

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

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

    public VerificationCodeView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init(attrs, defStyleAttr);
    }

    private void init(AttributeSet attrs, int defStyle) {
        TypedArray typedArray = getContext().obtainStyledAttributes(attrs, R.styleable.VerificationCodeView, defStyle, 0);
        mVCodeTextSize = typedArray.getDimensionPixelSize(
                R.styleable.VerificationCodeView_vcodeTextSize
                , getResources().getDimensionPixelSize(R.dimen.vcode_text_size));
        mVCodeTextColor = typedArray.getColor(
                R.styleable.VerificationCodeView_vcodeTextColor,
                getResources().getColor(R.color.vcode_text_color));
        mVCodeBottomIcon = typedArray.getDrawable(R.styleable.VerificationCodeView_vcodeBottomIcon);
        if (mVCodeBottomIcon == null) {
            mVCodeBottomIcon = getResources().getDrawable(R.drawable.icon_vcode_bottom);
        }
        mVCodeBottomErrorIcon = typedArray.getDrawable(R.styleable.VerificationCodeView_vcodeBottomIcon);
        if (mVCodeBottomErrorIcon == null) {
            mVCodeBottomErrorIcon = getResources().getDrawable(R.drawable.icon_vcode_error_bottom);
        }
        int mVCodeViewCount = typedArray.getInt(R.styleable.VerificationCodeView_vcodeViewCount, 4);
        mVCodeItemCenterSpaceSize = typedArray.getDimensionPixelSize(
                R.styleable.VerificationCodeView_vcodeItemSpaceSize,
                getResources().getDimensionPixelSize(R.dimen.vcode_item_space_size));
        typedArray.recycle();

        setOrientation(HORIZONTAL);
        setGravity(Gravity.CENTER);

        // 获取触摸时焦点
        setFocusableInTouchMode(true);

        if (mCodeStringBuilder == null) mCodeStringBuilder = new StringBuilder();
        mCodeViewList = new ArrayList<>();

        // 初始化验证码 item
        for (int i = 0; i < mVCodeViewCount; i++) {
            TextView underLineCodeView = getUnderLineCodeView();
            mCodeViewList.add(underLineCodeView);
            addView(underLineCodeView);
        }
    }

    public void setCodeCompleteListener(CodeCompleteListener listener) {
        mCodeCompleteListener = listener;
    }

    private TextView getUnderLineCodeView() {
        TextView textView = new TextView(getContext());
        textView.setTextSize(mVCodeTextSize);
        textView.setTextColor(mVCodeTextColor);
        textView.setGravity(Gravity.CENTER);
        int padding = mVCodeItemCenterSpaceSize / 2;
        textView.setPadding(
                padding
                , 0
                , padding
                , 0);
        int bottomIconWidth = (int) getResources().getDimension(R.dimen.vcode_bottom_icon_width);
        int bottomIconHeight = (int) getResources().getDimension(R.dimen.vcode_bottom_icon_height);
        TextViewUtils.addTextViewBottomIcon(textView, mVCodeBottomIcon, bottomIconWidth, bottomIconHeight);
        return textView;
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        requestFocusFromTouch();
        requestFocus();

        // 触摸控件时显示 键盘
        if (event.getAction() == MotionEvent.ACTION_DOWN) {
            InputMethodManager imm = (InputMethodManager) getContext()
                    .getSystemService(Context.INPUT_METHOD_SERVICE);
            imm.showSoftInput(this, InputMethodManager.SHOW_FORCED);
        }
        return true;
    }

    @Override
    public InputConnection onCreateInputConnection(EditorInfo outAttrs) {
        // 声明一个数字数字键盘
        BaseInputConnection fic = new BaseInputConnection(this, false);
        outAttrs.actionLabel = null;
        outAttrs.inputType = InputType.TYPE_CLASS_NUMBER;
        outAttrs.imeOptions = EditorInfo.IME_ACTION_NONE;
        return fic;
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (mCodeStringBuilder == null) mCodeStringBuilder = new StringBuilder();
        // keyCode = 67 是回退,keyCode = 【7，16】 是数字 【0，9】
        if (keyCode == 67 && mCodeStringBuilder.length() > 0) {
            mCodeStringBuilder.deleteCharAt(mCodeStringBuilder.length() - 1);
            resetCodeShowView();
        } else if (keyCode >= 7
                && keyCode <= 16
                && mCodeStringBuilder.length() < mCodeViewList.size()) {
            mCodeStringBuilder.append(keyCode - 7);
            resetCodeShowView();
        }
        if (mCodeStringBuilder.length() >= mCodeViewList.size() || keyCode == 66) {
            InputMethodManager imm = (InputMethodManager) getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
            imm.hideSoftInputFromWindow(getWindowToken(), 0);
        }
        return super.onKeyDown(keyCode, event);
    }

    private void resetCodeShowView() {
        if (mCodeStringBuilder == null || mCodeViewList == null || mCodeViewList.size() <= 0) {
            return;
        }

        for (int i = 0 ; i< mCodeViewList.size(); i++) {
            mCodeViewList.get(i).setText("");
            if (i < mCodeStringBuilder.length()) {
                mCodeViewList.get(i).setText(String.valueOf(mCodeStringBuilder.charAt(i)));
            }
        }

        if (mCodeCompleteListener != null) {
            if (mCodeStringBuilder.length() == mCodeViewList.size()) {
                mCodeCompleteListener.complete(true);
            } else {
                mCodeCompleteListener.complete(false);
            }
        }
    }

    public void setCodeItemLineDrawable(Drawable drawable) {
        for (TextView textView : mCodeViewList) {
            int bottomIconWidth = (int) getResources().getDimension(R.dimen.vcode_bottom_icon_width);
            int bottomIconHeight = (int) getResources().getDimension(R.dimen.vcode_bottom_icon_height);
            TextViewUtils.addTextViewBottomIcon(textView, drawable, bottomIconWidth, bottomIconHeight);
        }
    }

    public void resetCodeItemLineDrawable() {
        setCodeItemLineDrawable(mVCodeBottomIcon);
    }

    public void setCodeItemErrorLineDrawable() {
        for (TextView textView : mCodeViewList) {
            int bottomIconWidth = (int) getResources().getDimension(R.dimen.vcode_bottom_icon_width);
            int bottomIconHeight = (int) getResources().getDimension(R.dimen.vcode_bottom_icon_height);
            TextViewUtils.addTextViewBottomIcon(textView, mVCodeBottomErrorIcon, bottomIconWidth, bottomIconHeight);
        }
    }

    public String getTextString() {
        return mCodeStringBuilder == null ? "" : mCodeStringBuilder.toString();
    }
}