Android仿支付宝支付密码输入框

package com.jackie.alipay.password;  import android.annotation.TargetApi; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.os.Build; import android.util.AttributeSet; import android.widget.EditText; import android.widget.Toast;  /**  * Created by Administrator on 2016/10/31.  */  public class PasswordView extends EditText {  private Paint mBorderPaint;  //外框画笔  private Paint mLinePaint;  //线的画笔  private Paint mPasswordPaint; //密码画笔  private int mPasswordTextLength; //输入密码的长度  private int mWidth;  private int mHeight;   private static final int PASSWORD_LENGTH = 6;//密码的长度  private static final int PASSWORD_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);    initView();  }   private void initView() {   setFocusable(true);    mBorderPaint = new Paint();   mBorderPaint.setStrokeWidth(8);   mBorderPaint.setColor(Color.WHITE);   mBorderPaint.setStyle(Paint.Style.FILL);    mLinePaint = new Paint();   mLinePaint.setColor(Color.parseColor("#838B8B"));   mLinePaint.setStrokeWidth(4);    mPasswordPaint = new Paint();   mPasswordPaint.setColor(Color.BLACK);   mPasswordPaint.setStrokeWidth(12);  }   @Override  protected void onDraw(Canvas canvas) {   super.onDraw(canvas);    mWidth = getMeasuredWidth();   mHeight = getMeasuredHeight();    drawRoundRect(canvas);   drawLine(canvas);   drawPassword(canvas);  }   /**   * 绘制圆角矩形背景   * @param canvas   */  @TargetApi(Build.VERSION_CODES.LOLLIPOP)  private void drawRoundRect(Canvas canvas) {   canvas.drawRoundRect(0, 0, mWidth, mHeight, 12, 12, mBorderPaint);   }   /**   * 绘制分割线   * @param canvas   */  private void drawLine(Canvas canvas) {   for (int i = 1; i < PASSWORD_LENGTH; i++) {    float x = mWidth * i / PASSWORD_LENGTH;    canvas.drawLine(x, 12, x, mHeight - 12, mLinePaint);   }  }   /**   * 绘制密码   * @param canvas   */  private void drawPassword(Canvas canvas) {   float cx, cy = mHeight / 2;   float half = mWidth / PASSWORD_LENGTH / 2;   for (int i = 0; i < mPasswordTextLength; i++) {    cx = mWidth * i / PASSWORD_LENGTH + half;    canvas.drawCircle(cx, cy, PASSWORD_RADIUS, mPasswordPaint);   }  }   @Override  protected void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) {   super.onTextChanged(text, start, lengthBefore, lengthAfter);    mPasswordTextLength = text.toString().length();    if (mPasswordTextLength == PASSWORD_LENGTH) {    Toast.makeText(getContext(), "您设置的密码为: " + text, Toast.LENGTH_SHORT).show();;   }    invalidate();  }    public void reset(){   setText("");   invalidate();  } }