android仿支付宝密码输入框效果

<?xml version="1.0" encoding="utf-8"? 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
  
 <com.example.custompasswordview.PasswordView
  android:id="@+id/passwordview"
  android:layout_width="match_parent"
  android:layout_height="105px"
  android:layout_marginTop="100px"
  android:layout_marginLeft="20px"
  android:layout_marginRight="20px"
  android:inputType="number"
  android:cursorVisible="false"
  android:focusable="true"
  android:focusableInTouchMode="true"
  android:enabled="true"
  android:clickable="true"
   / 
 <Button
  android:id="@+id/btn_pass_reset"
  android:layout_width="250px"
  android:layout_height="90px"
  android:text="重置"
  android:layout_below="@id/passwordview"
  android:layout_marginTop="20px"
  android:layout_marginLeft="40px"
  android:gravity="center"
  / 
</RelativeLayout 

package com.example.custompasswordview;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class MainActivity extends Activity {
 private Button btn_pass_reset;
 private PasswordView passwordview;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  btn_pass_reset = (Button) findViewById(R.id.btn_pass_reset);
  passwordview = (PasswordView) findViewById(R.id.passwordview);
  btn_pass_reset.setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View v) {
    passwordview.setEmpeyText();
   }
  });
 }
}

package com.example.custompasswordview;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.util.Log;
import android.widget.EditText;
import android.widget.Toast;
/**
* Created by Adminis on 2016/8/7.
*/
public class PasswordView extends EditText {
private static final String TAG ="PasswordView" ;
private Paint bordPaint;//外框画笔
private Paint linePaint;//线 的画笔
private Paint passTextPaint;//密码画笔
private int width;
private int height;
private int passwordLength = 6;//代码的长度
private int textLength;
private int radius = 15;
public PasswordView(Context context) {
this(context,null);
}
public PasswordView(Context context, AttributeSet attrs) {
this(context, attrs,0);
}
public PasswordView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initPaint();
}
/**
* 初始化画笔
*/
private void initPaint() {
setFocusable(true);
bordPaint = new Paint();
bordPaint.setStrokeWidth(8);
bordPaint.setColor(Color.WHITE);
bordPaint.setStyle(Paint.Style.FILL);
linePaint = new Paint();
linePaint.setColor(Color.parseColor("#838B8B"));
linePaint.setStrokeWidth(4);
passTextPaint = new Paint();
passTextPaint.setColor(Color.parseColor("#000000"));
passTextPaint.setStrokeWidth(12);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
height = getMeasuredHeight();
width = getMeasuredWidth();
drawRoundRect(canvas);
drawLine(canvas);
drawTextPass(canvas);
}
/**
* 绘制密码
* @param canvas
*/
private void drawTextPass(Canvas canvas) {
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, radius, passTextPaint);
}
}
/**
* 绘制线
* @param canvas
*/
private void drawLine(Canvas canvas) {
for (int i = 1; i < passwordLength; i++) {
float x = width * i / passwordLength;
canvas.drawLine(x, 12, x, height-12, linePaint);
}
}
/**
* 绘制背景
* @param canvas
*/
private void drawRoundRect(Canvas canvas) {
canvas.drawRoundRect(0,0,width,height,12,12,bordPaint);
}
@Override
protected void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) {
super.onTextChanged(text, start, lengthBefore, lengthAfter);
this.textLength = text.toString().length();
if(textLength==6){
Toast.makeText(getContext(),"您设置的密码为"+text,Toast.LENGTH_SHORT).show();
}
invalidate();
}
public void setEmpeyText(){
setText("");
invalidate();
}
}