您好,登錄后才能下訂單哦!
這篇文章主要為大家展示了“Android如何實現(xiàn)仿支付寶自定義密碼輸入框及安全鍵盤”,內(nèi)容簡而易懂,條理清晰,希望能夠幫助大家解決疑惑,下面讓小編帶領(lǐng)大家一起研究并學(xué)習(xí)一下“Android如何實現(xiàn)仿支付寶自定義密碼輸入框及安全鍵盤”這篇文章吧。
之前做過的項目里有運(yùn)用到一個支付場景:用戶辦理業(yè)務(wù)時需要輸入交易密碼,并且可根據(jù)平臺下發(fā)的支付方式進(jìn)行選擇。這與支付寶的密碼輸入方式十分相似,如果使用Android系統(tǒng)或者第三方軟件的鍵盤,會有密碼泄露的風(fēng)險。因此,大多數(shù)的應(yīng)用軟件使用的是自定義的密碼輸入框及安全鍵盤。
由于密碼輸入方式需要實現(xiàn)一個從底部彈出的效果,因此總體上決定采用BottomSheetDialog來進(jìn)行封裝,同時為了提高安全性,還應(yīng)該隨機(jī)生成鍵盤上的數(shù)字,界面如下圖所示:
首先新建一個PasswordInputView類,將需要使用到的Context對象、支付金額、可支持的支付方式等數(shù)據(jù),作為該類構(gòu)造方法的參數(shù)進(jìn)行傳遞。下文還將提到該類有一個回調(diào)方法,當(dāng)用戶輸入的密碼滿足六位時,可以在回調(diào)方法中獲取密碼并顯示出來。PasswordInputView類的構(gòu)造方法如下所示:
public PasswordInputView(Context context, String payMoney, List<String> payWayList) { this.context = context; this.payMoney = payMoney; this.payWayList = payWayList; payPwdDialog = new BottomSheetDialog(context); View view = LayoutInflater.from(context).inflate(R.layout.dialog_pay_pwd, null, false); initStep1(view); initStep2(view); llyPwdInputView = (LinearLayout) view.findViewById(R.id.lly_pwd_input_view); llyPayWaySelect = (LinearLayout) view.findViewById(R.id.lly_pay_way_select); showStep1(); // 顯示第一頁 }
因為不能明文顯示輸入的密碼,所以使用“●”來代替每位密碼。自定義密碼輸入框涉及到的自定義屬性,主要包括:輸入框的大小、顏色、圓角半徑以及密碼圓點的大小、顏色、半徑。因此,自定義屬性attrs.xml文件如下所示:
<?xml version="1.0" encoding="utf-8"?> <resources> <declare-styleable name="PasswordEditText"> <attr name="borderWidth" format="dimension"/> <attr name="borderColor" format="color"/> <attr name="borderRadius" format="dimension"/> <attr name="passwordLength" format="integer"/> <attr name="passwordWidth" format="dimension"/> <attr name="passwordColor" format="color"/> <attr name="passwordRadius" format="dimension"/> </declare-styleable> </resources>
接下來就需要去繪制自定義控件了。首先獲取自定義屬性,然后在onDraw()中進(jìn)行繪制,代碼如下所示:
package com.syd.paypwddialogdemo; import static android.graphics.Paint.ANTI_ALIAS_FLAG; import android.content.Context; import android.content.res.Resources; import android.content.res.TypedArray; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.RectF; import android.support.v7.widget.AppCompatEditText; import android.util.AttributeSet; /** * 自定義密碼輸入框 */ public class PasswordEditText extends AppCompatEditText { private int textLength; private int borderColor; private float borderWidth; private float borderRadius; private int passwordLength; private int passwordColor; private float passwordWidth; private float passwordRadius; private Paint passwordPaint = new Paint(ANTI_ALIAS_FLAG); private Paint borderPaint = new Paint(ANTI_ALIAS_FLAG); private final int defaultContMargin = 5; private final int defaultSplitLineWidth = 3; public PasswordEditText(Context context, AttributeSet attrs) { super(context, attrs); final Resources res = getResources(); final int defaultBorderColor = res.getColor(R.color.colorGray); final float defaultBorderWidth = res.getDimension(R.dimen.default_ev_border_width); final float defaultBorderRadius = res.getDimension(R.dimen.default_ev_border_radius); final int defaultPasswordLength = res.getInteger(R.integer.default_ev_password_length); final int defaultPasswordColor = res.getColor(R.color.colorBlack); final float defaultPasswordWidth = res.getDimension(R.dimen.default_ev_password_width); final float defaultPasswordRadius = res.getDimension(R.dimen.default_ev_password_radius); TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.PasswordEditText, 0, 0); try { borderColor = a.getColor(R.styleable.PasswordEditText_borderColor, defaultBorderColor); borderWidth = a.getDimension(R.styleable.PasswordEditText_borderWidth, defaultBorderWidth); borderRadius = a.getDimension(R.styleable.PasswordEditText_borderRadius, defaultBorderRadius); passwordLength = a.getInt(R.styleable.PasswordEditText_passwordLength, defaultPasswordLength); passwordColor = a.getColor(R.styleable.PasswordEditText_passwordColor, defaultPasswordColor); passwordWidth = a.getDimension(R.styleable.PasswordEditText_passwordWidth, defaultPasswordWidth); passwordRadius = a.getDimension(R.styleable.PasswordEditText_passwordRadius, defaultPasswordRadius); } finally { a.recycle(); } borderPaint.setStrokeWidth(borderWidth); borderPaint.setColor(borderColor); passwordPaint.setStrokeWidth(passwordWidth); passwordPaint.setStyle(Paint.Style.FILL); passwordPaint.setColor(passwordColor); } @Override protected void onDraw(Canvas canvas) { int width = getWidth(); int height = getHeight(); RectF rect = new RectF(0, 0, width, height); borderPaint.setColor(borderColor); canvas.drawRoundRect(rect, borderRadius, borderRadius, borderPaint); RectF rectIn = new RectF(rect.left + defaultContMargin, rect.top + defaultContMargin, rect.right - defaultContMargin, rect.bottom - defaultContMargin); borderPaint.setColor(Color.WHITE); canvas.drawRoundRect(rectIn, borderRadius, borderRadius, borderPaint); borderPaint.setColor(borderColor); borderPaint.setStrokeWidth(defaultSplitLineWidth); for (int i = 1; i < passwordLength; i++) { float x = width * i / passwordLength; canvas.drawLine(x, 0, x, height, borderPaint); } float cx, cy = height / 2; float half = width / passwordLength / 2; for (int i = 0; i < textLength; i++) { cx = width * i / passwordLength + half; canvas.drawCircle(cx, cy, passwordWidth, passwordPaint); } } @Override protected void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) { super.onTextChanged(text, start, lengthBefore, lengthAfter); this.textLength = text.toString().length(); invalidate(); } public int getBorderColor() { return borderColor; } public void setBorderColor(int borderColor) { this.borderColor = borderColor; borderPaint.setColor(borderColor); invalidate(); } public float getBorderWidth() { return borderWidth; } public void setBorderWidth(float borderWidth) { this.borderWidth = borderWidth; borderPaint.setStrokeWidth(borderWidth); invalidate(); } public float getBorderRadius() { return borderRadius; } public void setBorderRadius(float borderRadius) { this.borderRadius = borderRadius; invalidate(); } public int getPasswordLength() { return passwordLength; } public void setPasswordLength(int passwordLength) { this.passwordLength = passwordLength; invalidate(); } public int getPasswordColor() { return passwordColor; } public void setPasswordColor(int passwordColor) { this.passwordColor = passwordColor; passwordPaint.setColor(passwordColor); invalidate(); } public float getPasswordWidth() { return passwordWidth; } public void setPasswordWidth(float passwordWidth) { this.passwordWidth = passwordWidth; passwordPaint.setStrokeWidth(passwordWidth); invalidate(); } public float getPasswordRadius() { return passwordRadius; } public void setPasswordRadius(float passwordRadius) { this.passwordRadius = passwordRadius; invalidate(); } }
安全鍵盤主要是通過GridView來實現(xiàn),上文提到為了保證安全性,在安全鍵盤初始化的時候,應(yīng)該隨機(jī)生成鍵盤上的數(shù)字,代碼如下所示:
/** * 初始化密碼鍵盤 */ private void initKeyboard() { final int number = 10; int[] keys = new int[number]; for (int i = 0; i < 10; i++) { keys[i] = i; } // 隨機(jī)生成鍵盤數(shù)字 Random random = new Random(); for (int i = 0; i < number; i++) { int p = random.nextInt(number); int tmp = keys[i]; keys[i] = keys[p]; keys[p] = tmp; } numList = new ArrayList<>(); for (int i = 0; i < 12; i++) { Map<String, String> map = new HashMap<>(); if (i < 9) { map.put("num", String.valueOf(keys[i])); } else if (i == 9) { map.put("num", ""); } else if (i == 10) { map.put("num", String.valueOf(keys[9])); } else if (i == 11) { map.put("num", ""); } numList.add(map); } KeyAdapter keyAdapter = new KeyAdapter(context, numList, handler); gvKeyboard.setAdapter(keyAdapter); }
安全鍵盤點擊事件的處理,是在適配器KeyAdapter的構(gòu)造方法中傳入Handler對象,通過收發(fā)消息的方式在PasswordInputView類中處理的,代碼如下所示:
holder.btnKey.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Message msg = new Message(); msg.what = Constants.KEYBOARD_INPUT; msg.obj = position; handler.sendMessage(msg); } });
Handler對象在PasswordInputView類中定義,主要用于處理安全鍵盤的點擊事件,代碼如下所示:
Handler handler = new Handler() { @Override public void dispatchMessage(Message msg) { switch (msg.what) { case Constants.KEYBOARD_INPUT: int position = (int) msg.obj; if (position < 11 && position != 9) { // 點擊0-9按鍵 password = etPwd.getText().append(numList.get(position).get("num")).toString(); etPwd.setText(password); } else { if (position == 11) { // 點擊退格鍵 if (!TextUtils.isEmpty(password) && !password.equals("")) { password = etPwd.getText().delete(password.length() - 1, password.length()).toString(); etPwd.setText(password); } } } break; } } };
為了方便外部獲取到用戶輸入的密碼,設(shè)計一個回調(diào)接口OnPwdInputListener,并在PasswordInputView類中為回調(diào)接口創(chuàng)建一個set方法,代碼如下所示:
package com.syd.paypwddialogdemo; public interface OnPwdInputListener { void onPwdInput(String password); }
當(dāng)PasswordEditText控件的TextWatcher對象監(jiān)聽到輸入的密碼滿足六位時,調(diào)用回調(diào)方法,將密碼作為參數(shù)進(jìn)行傳遞,代碼如下所示:
textWatcher = new TextWatcher() { @Override public void afterTextChanged(Editable s) { if (etPwd.getText().length() == 6) { onPwdInputListener.onPwdInput(etPwd.getText().toString()); } } }; etPwd.addTextChangedListener(textWatcher);
在外部調(diào)用set方法,創(chuàng)建OnPwdInputListener對象,重寫回調(diào)方法,即可獲取到用戶輸入的密碼,代碼如下所示:
pwdInputView.setOnPwdInputListener(new OnPwdInputListener() { @Override public void onPwdInput(String password) { Toast.makeText(MainActivity.this, password, Toast.LENGTH_SHORT).show(); } });
以上是“Android如何實現(xiàn)仿支付寶自定義密碼輸入框及安全鍵盤”這篇文章的所有內(nèi)容,感謝各位的閱讀!相信大家都有了一定的了解,希望分享的內(nèi)容對大家有所幫助,如果還想學(xué)習(xí)更多知識,歡迎關(guān)注億速云行業(yè)資訊頻道!
免責(zé)聲明:本站發(fā)布的內(nèi)容(圖片、視頻和文字)以原創(chuàng)、轉(zhuǎn)載和分享為主,文章觀點不代表本網(wǎng)站立場,如果涉及侵權(quán)請聯(lián)系站長郵箱:is@yisu.com進(jìn)行舉報,并提供相關(guān)證據(jù),一經(jīng)查實,將立刻刪除涉嫌侵權(quán)內(nèi)容。