之前做过的项目里有运用到一个支付场景:用户办理业务时需要输入交易密码,并且可根据平台下发的支付方式进行选择。这与支付宝的密码输入方式十分相似,如果使用AndroID系统或者第三方软件的键盘,会有密码泄露的风险。因此,大多数的应用软件使用的是自定义的密码输入框及安全键盘。
由于密码输入方式需要实现一个从底部d出的效果,因此总体上决定采用BottomSheetDialog来进行封装,同时为了提高安全性,还应该随机生成键盘上的数字,界面如下图所示:
首先新建一个PasswordinputVIEw类,将需要使用到的Context对象、支付金额、可支持的支付方式等数据,作为该类构造方法的参数进行传递。下文还将提到该类有一个回调方法,当用户输入的密码满足六位时,可以在回调方法中获取密码并显示出来。PasswordinputVIEw类的构造方法如下所示:
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(); // 显示第一页 }1、自定义密码输入框
因为不能明文显示输入的密码,所以使用“●”来代替每位密码。自定义密码输入框涉及到的自定义属性,主要包括:输入框的大小、颜色、圆角半径以及密码圆点的大小、颜色、半径。因此,自定义属性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>
接下来就需要去绘制自定义控件了。首先获取自定义属性,然后在onDraw()中进行绘制,代码如下所示:
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; /** * 自定义密码输入框 */ 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); 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,wIDth,height); borderPaint.setcolor(bordercolor); canvas.drawRoundRect(rect,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,borderPaint); borderPaint.setcolor(bordercolor); borderPaint.setstrokeWIDth(defaultSplitlinewidth); for (int i = 1; i < passwordLength; i++) { float x = wIDth * i / passwordLength; canvas.drawline(x,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(); } }2、安全键盘的实现
安全键盘主要是通过GrIDVIEw来实现,上文提到为了保证安全性,在安全键盘初始化的时候,应该随机生成键盘上的数字,代码如下所示:
/** * 初始化密码键盘 */ private voID initKeyboard() { final int number = 10; int[] keys = new int[number]; for (int i = 0; i < 10; i++) { keys[i] = i; } // 随机生成键盘数字 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); }
安全键盘点击事件的处理,是在适配器KeyAdapter的构造方法中传入Handler对象,通过收发消息的方式在PasswordinputVIEw类中处理的,代码如下所示:
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对象在PasswordinputVIEw类中定义,主要用于处理安全键盘的点击事件,代码如下所示:
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) { // 点击0-9按键 password = etPwd.getText().append(numList.get(position).get("num")).toString(); etPwd.setText(password); } else { if (position == 11) { // 点击退格键 if (!TextUtils.isEmpty(password) && !password.equals("")) { password = etPwd.getText().delete(password.length() - 1,password.length()).toString(); etPwd.setText(password); } } } break; } } };
为了方便外部获取到用户输入的密码,设计一个回调接口OnPwdinputListener,并在PasswordinputVIEw类中为回调接口创建一个set方法,代码如下所示:
package com.syd.paypwddialogdemo; public interface OnPwdinputListener { voID onPwdinput(String password); }
当PasswordEditText控件的TextWatcher对象监听到输入的密码满足六位时,调用回调方法,将密码作为参数进行传递,代码如下所示:
textWatcher = new TextWatcher() { @OverrIDe public voID afterTextChanged(Editable s) { if (etPwd.getText().length() == 6) { onPwdinputListener.onPwdinput(etPwd.getText().toString()); } } }; etPwd.addTextChangedListener(textWatcher);
在外部调用set方法,创建OnPwdinputListener对象,重写回调方法,即可获取到用户输入的密码,代码如下所示:
pwdinputVIEw.setonPwdinputListener(new OnPwdinputListener() { @OverrIDe public voID onPwdinput(String password) { Toast.makeText(MainActivity.this,password,Toast.LENGTH_SHORT).show(); } });3、结语
以上介绍了自定义密码输入框及安全键盘的大致实现思路,对源码感兴趣的小伙伴可以点击下载Demo,查看具体的实现过程及演示效果。
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