仿微信支付密码输入框

两种不同实现，使用系统键盘和使用自定义键盘

1.简单功能，可结合自定义键盘使用，未处理系统键盘输入
布局

<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="match_parent">
    <TextView
        android:id="@+id/input1"
        android:layout_width="@dimen/dimen_36_dip"
        android:layout_height="@dimen/dimen_36_dip"
        android:textSize="20sp"
        android:textColor="#000000"
        android:gravity="center"
        android:background="@drawable/shape_bg_single_input"/>
    <TextView
        android:id="@+id/input2"
        android:layout_width="@dimen/dimen_36_dip"
        android:layout_height="@dimen/dimen_36_dip"
        android:layout_marginLeft="-1dp"
        android:textSize="20sp"
        android:textColor="#000000"
        android:gravity="center"
        android:background="@drawable/shape_bg_single_input"/>
    <TextView
        android:id="@+id/input3"
        android:layout_width="@dimen/dimen_36_dip"
        android:layout_height="@dimen/dimen_36_dip"
        android:layout_marginLeft="-1dp"
        android:textSize="20sp"
        android:textColor="#000000"
        android:gravity="center"
        android:background="@drawable/shape_bg_single_input"/>
    <TextView
        android:id="@+id/input4"
        android:layout_width="@dimen/dimen_36_dip"
        android:layout_height="@dimen/dimen_36_dip"
        android:layout_marginLeft="-1dp"
        android:textSize="20sp"
        android:textColor="#000000"
        android:gravity="center"
        android:background="@drawable/shape_bg_single_input"/>
    <TextView
        android:id="@+id/input5"
        android:layout_width="@dimen/dimen_36_dip"
        android:layout_height="@dimen/dimen_36_dip"
        android:layout_marginLeft="-1dp"
        android:textSize="20sp"
        android:textColor="#000000"
        android:gravity="center"
        android:background="@drawable/shape_bg_single_input"/>
    <TextView
        android:id="@+id/input6"
        android:layout_width="@dimen/dimen_36_dip"
        android:layout_height="@dimen/dimen_36_dip"
        android:layout_marginLeft="-1dp"
        android:textSize="20sp"
        android:textColor="#000000"
        android:gravity="center"
        android:background="@drawable/shape_bg_single_input"/>
</merge>

代码：

public class VerifyCodeView extends LinearLayout {
    private static final int MESSAGE_VERIFY_LENGTH = 6;
    private int mCurrent;
    private StringBuilder mMessageVerify = new StringBuilder();
    private InputCompleteListener mCompleteListener;

    public VerifyCodeView(Context context) {
        super(context);
        init();
    }

    public VerifyCodeView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

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

    private void init() {
        setOrientation(LinearLayout.HORIZONTAL);
        setGravity(Gravity.CENTER);
        LayoutInflater.from(getContext()).inflate(R.layout.view_single_input, this);
        mCurrent = 0;
    }

    public void append(String num) {
        if (mCurrent == MESSAGE_VERIFY_LENGTH) {
            return;
        }
        mMessageVerify.append(num);
        ((TextView) getChildAt(mCurrent)).setText(num);
        mCurrent++;
        if (mCurrent == MESSAGE_VERIFY_LENGTH && mCompleteListener != null) {
            mCompleteListener.onComplete();
            clearContent();
            return;
        }
    }

    public void delete() {
        if (mCurrent > 0) {
            mCurrent--;
            mMessageVerify.delete(mCurrent, mCurrent);
            ((TextView) getChildAt(mCurrent)).setText("");
        }
    }

    public void clearContent() {
        mCurrent = 0;
        mMessageVerify = new StringBuilder();
        for (int i = 0; i < MESSAGE_VERIFY_LENGTH; i++) {
            ((TextView) getChildAt(i)).setText("");
        }
    }

    public String getMessage() {
        return mMessageVerify.toString();
    }

    public interface InputCompleteListener {
        void onComplete();
    }

    public void setCompleteListener(InputCompleteListener completeListener) {
        mCompleteListener = completeListener;
    }
}

2.系统键盘输入

public class VerifyCodeView extends LinearLayout implements View.OnFocusChangeListener, TextWatcher, VerifyEditText.EmptyBackListener {
    private static final int MESSAGE_VERIFY_LENGTH = 6;
    private int mCurrent;
    private StringBuilder mMessageVerify = new StringBuilder();
    private VerifyEditText mItem1;
    private VerifyEditText mItem2;
    private VerifyEditText mItem3;
    private VerifyEditText mItem4;
    private VerifyEditText mItem5;
    private VerifyEditText mItem6;

    public VerifyCodeView(Context context) {
        super(context);
        init();
    }

    public VerifyCodeView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

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

    private void init() {
        setOrientation(LinearLayout.HORIZONTAL);
        setGravity(Gravity.CENTER);
        LayoutInflater.from(getContext()).inflate(R.layout.view_single_input, this);
        mItem1 = (VerifyEditText) findViewById(R.id.input1);
        initEditText(mItem1, 1);
        mItem2 = (VerifyEditText) findViewById(R.id.input2);
        initEditText(mItem2, 2);
        mItem3 = (VerifyEditText) findViewById(R.id.input3);
        initEditText(mItem3, 3);
        mItem4 = (VerifyEditText) findViewById(R.id.input4);
        initEditText(mItem4, 4);
        mItem5 = (VerifyEditText) findViewById(R.id.input5);
        initEditText(mItem5, 5);
        mItem6 = (VerifyEditText) findViewById(R.id.input6);
        initEditText(mItem6, 6);
        mCurrent = 0;
    }

    private void initEditText(VerifyEditText item, int tag) {
        item.setOnFocusChangeListener(this);
        item.setTag(tag);
        item.setListener(this);
        item.addTextChangedListener(this);
    }

    public void append(String num) {
        if (mCurrent == MESSAGE_VERIFY_LENGTH) {
            return;
        }
        mMessageVerify.append(num);
        mCurrent++;
    }

    public void delete() {
        if (mCurrent > 0) {
            mMessageVerify = mMessageVerify.deleteCharAt(mCurrent - 1);
            mCurrent--;
        }
    }

    public void clearContent() {
        mCurrent = 0;
        mMessageVerify = new StringBuilder();
        for (int i = 0; i < MESSAGE_VERIFY_LENGTH; i++) {
            ((TextView) getChildAt(i)).setText("");
        }
    }

    public String getMessage() {
        return mMessageVerify.toString();
    }

    @Override
    public void onFocusChange(View v, boolean hasFocus) {
        if (hasFocus && (int) v.getTag() != mCurrent) {
            if (mCurrent < MESSAGE_VERIFY_LENGTH) {
                getChildAt(mCurrent).requestFocus();
            } else {
                getChildAt(MESSAGE_VERIFY_LENGTH - 1).requestFocus();
            }
        }
    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {

    }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {

    }

    @Override
    public void afterTextChanged(Editable s) {
        if (!TextUtils.isEmpty(s.toString())) {
            append(s.toString());
            if (mCurrent < MESSAGE_VERIFY_LENGTH) {
                getChildAt(mCurrent).requestFocus();
            }
        } else if (mCurrent == MESSAGE_VERIFY_LENGTH) {
            delete();
            EditText edt = (EditText) getChildAt(mCurrent);
            edt.setText(null);
            edt.requestFocus();
        }
    }

    @Override
    public void onEmptyBack() {
        delete();
        EditText edt = (EditText) getChildAt(mCurrent);
        edt.setText(null);
        edt.requestFocus();
    }
}

public class VerifyEditText extends AppCompatEditText {

    private EmptyBackListener mListener;

    public VerifyEditText(Context context) {
        super(context);
    }

    public VerifyEditText(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

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

    public void setListener(EmptyBackListener listener) {
        mListener = listener;
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (TextUtils.isEmpty(getText()) && keyCode == KeyEvent.KEYCODE_DEL && mListener != null) {
            mListener.onEmptyBack();
        }
        return super.onKeyDown(keyCode, event);
    }

    interface EmptyBackListener {
        void onEmptyBack();
    }
}