package com.mukesh;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Color;
import android.graphics.PorterDuff;
import android.text.Editable;
import android.text.TextUtils;
import android.text.InputType;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.util.Log;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;
import android.widget.LinearLayout;
public class OtpView extends LinearLayout {
private EditText mOtpOneField, mOtpTwoField, mOtpThreeField, mOtpFourField,
mCurrentlyFocusedEditText;
public OtpView(Context context) {
super(context);
init(null);
}
public OtpView(Context context, AttributeSet attrs) {
super(context, attrs);
init(attrs);
}
public OtpView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(attrs);
}
private void init(AttributeSet attrs) {
TypedArray styles = getContext().obtainStyledAttributes(attrs, R.styleable.OtpView);
LayoutInflater mInflater =
(LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mInflater.inflate(R.layout.otpview_layout, this);
mOtpOneField = (EditText) findViewById(R.id.otp_one_edit_text);
mOtpTwoField = (EditText) findViewById(R.id.otp_two_edit_text);
mOtpThreeField = (EditText) findViewById(R.id.otp_three_edit_text);
mOtpFourField = (EditText) findViewById(R.id.otp_four_edit_text);
styleEditTexts(styles);
styles.recycle();
}
/**
* Get an instance of the present otp
*/
private String makeOTP(){
StringBuilder stringBuilder=new StringBuilder();
stringBuilder.append(mOtpOneField.getText().toString());
stringBuilder.append(mOtpTwoField.getText().toString());
stringBuilder.append(mOtpThreeField.getText().toString());
stringBuilder.append(mOtpFourField.getText().toString());
return stringBuilder.toString();
}
/**
* Checks if all four fields have been filled
* @return length of OTP
*/
public boolean hasValidOTP(){
return makeOTP().length()==4;
}
/**
* Returns the present otp entered by the user
* @return OTP
*/
public String getOTP(){
return makeOTP();
}
/**
* Used to set the OTP. More of cosmetic value than functional value
* @param otp Send the four digit otp
*/
public void setOTP(String otp){
if(otp.length()!=4){
Log.e("OTPView","Invalid otp param");
return;
}
if(mOtpOneField.getInputType()== InputType.TYPE_CLASS_NUMBER
&& !otp.matches("[0-9]+")){
Log.e("OTPView","OTP doesn't match INPUT TYPE");
return;
}
mOtpOneField.setText(otp.charAt(0));
mOtpTwoField.setText(otp.charAt(1));
mOtpThreeField.setText(otp.charAt(2));
mOtpFourField.setText(otp.charAt(3));
}
private void styleEditTexts(TypedArray styles) {
int textColor = styles.getColor(R.styleable.OtpView_android_textColor, Color.BLACK);
int backgroundColor =
styles.getColor(R.styleable.OtpView_text_background_color, Color.TRANSPARENT);
if (styles.getColor(R.styleable.OtpView_text_background_color, Color.TRANSPARENT)
!= Color.TRANSPARENT) {
mOtpOneField.setBackgroundColor(backgroundColor);
mOtpTwoField.setBackgroundColor(backgroundColor);
mOtpThreeField.setBackgroundColor(backgroundColor);
mOtpFourField.setBackgroundColor(backgroundColor);
} else {
mOtpOneField.getBackground().mutate().setColorFilter(textColor, PorterDuff.Mode.SRC_ATOP);
mOtpTwoField.getBackground().mutate().setColorFilter(textColor, PorterDuff.Mode.SRC_ATOP);
mOtpThreeField.getBackground().mutate().setColorFilter(textColor, PorterDuff.Mode.SRC_ATOP);
mOtpFourField.getBackground().mutate().setColorFilter(textColor, PorterDuff.Mode.SRC_ATOP);
}
mOtpOneField.setTextColor(textColor);
mOtpTwoField.setTextColor(textColor);
mOtpThreeField.setTextColor(textColor);
mOtpFourField.setTextColor(textColor);
setEditTextInputStyle(styles);
}
private void setEditTextInputStyle(TypedArray styles) {
int inputType =
styles.getInt(R.styleable.OtpView_android_inputType, EditorInfo.TYPE_TEXT_VARIATION_NORMAL);
mOtpOneField.setInputType(inputType);
mOtpTwoField.setInputType(inputType);
mOtpThreeField.setInputType(inputType);
mOtpFourField.setInputType(inputType);
String text = styles.getString(R.styleable.OtpView_otp);
if (!TextUtils.isEmpty(text) && text.length() == 4) {
mOtpOneField.setText(String.valueOf(text.charAt(0)));
mOtpTwoField.setText(String.valueOf(text.charAt(1)));
mOtpThreeField.setText(String.valueOf(text.charAt(2)));
mOtpFourField.setText(String.valueOf(text.charAt(3)));
}
setFocusListener();
setOnTextChangeListener();
}
private void setFocusListener() {
View.OnFocusChangeListener onFocusChangeListener = new View.OnFocusChangeListener() {
@Override public void onFocusChange(View v, boolean hasFocus) {
mCurrentlyFocusedEditText = (EditText) v;
mCurrentlyFocusedEditText.setSelection(mCurrentlyFocusedEditText.getText().length());
}
};
mOtpOneField.setOnFocusChangeListener(onFocusChangeListener);
mOtpTwoField.setOnFocusChangeListener(onFocusChangeListener);
mOtpThreeField.setOnFocusChangeListener(onFocusChangeListener);
mOtpFourField.setOnFocusChangeListener(onFocusChangeListener);
}
public void disableKeypad() {
OnTouchListener touchListener = new OnTouchListener() {
@Override public boolean onTouch(View v, MotionEvent event) {
v.onTouchEvent(event);
InputMethodManager imm =
(InputMethodManager) v.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
if (imm != null) {
imm.hideSoftInputFromWindow(v.getWindowToken(), 0);
}
return true;
}
};
mOtpOneField.setOnTouchListener(touchListener);
mOtpTwoField.setOnTouchListener(touchListener);
mOtpThreeField.setOnTouchListener(touchListener);
mOtpFourField.setOnTouchListener(touchListener);
}
public void enableKeypad() {
OnTouchListener touchListener = new OnTouchListener() {
@Override public boolean onTouch(View v, MotionEvent event) {
return false;
}
};
mOtpOneField.setOnTouchListener(touchListener);
mOtpTwoField.setOnTouchListener(touchListener);
mOtpThreeField.setOnTouchListener(touchListener);
mOtpFourField.setOnTouchListener(touchListener);
}
public EditText getCurrentFoucusedEditText() {
return mCurrentlyFocusedEditText;
}
private void setOnTextChangeListener() {
TextWatcher textWatcher = new TextWatcher() {
@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 (mCurrentlyFocusedEditText.getText().length() >= 1
&& mCurrentlyFocusedEditText != mOtpFourField) {
mCurrentlyFocusedEditText.focusSearch(View.FOCUS_RIGHT).requestFocus();
} else if (mCurrentlyFocusedEditText.getText().length() >= 1
&& mCurrentlyFocusedEditText == mOtpFourField) {
InputMethodManager imm =
(InputMethodManager) getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
if (imm != null) {
// imm.hideSoftInputFromWindow(getWindowToken(), 0);
}
} else {
String currentValue = mCurrentlyFocusedEditText.getText().toString();
if (currentValue.length() <= 0 && mCurrentlyFocusedEditText.getSelectionStart() <= 0) {
mCurrentlyFocusedEditText.focusSearch(View.FOCUS_LEFT).requestFocus();
}
}
}
};
mOtpOneField.addTextChangedListener(textWatcher);
mOtpTwoField.addTextChangedListener(textWatcher);
mOtpThreeField.addTextChangedListener(textWatcher);
mOtpFourField.addTextChangedListener(textWatcher);
}
public void simulateDeletePress() {
mCurrentlyFocusedEditText.setText("");
}
}
由java.lang.NullPointerException引起的错误：尝试在com.mukesh.OtpView $ 4.afterTextChanged上的空对象引用上调用虚拟方法'android.text.Editable android.widget.EditText.getText（）' OtpView.java:199）
答案 0 :(得分：0)
扩展ViewGroup后，xml中添加的子项将被忽略，因此
@Override
protected void onFinishInflate() {
super.onFinishInflate();
//here either inflate from a separate xml layout and addView
//OR manually create Views dynamically addView
}