Android本地验证码的简易实现方法（防止暴力登录）

<&＃63;xml version="1.0" encoding="utf-8"&＃63;> 
 
  
   
   
   
  
 

public MyView(Context context, AttributeSet attrs, int defStyle) { 
  super(context, attrs, defStyle); 
  TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.MyView); 
  for (int i = 0; i 

@Override  
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 
  int width = 0; 
  int height = 0; 
  int specMode = MeasureSpec.getMode(widthMeasureSpec); 
  int specSize = MeasureSpec.getSize(widthMeasureSpec); 
  switch (specMode) { 
   case MeasureSpec.EXACTLY: 
    width = getPaddingLeft() + getPaddingRight() + specSize; 
    break; 
   case MeasureSpec.AT_MOST: 
    width = getPaddingLeft() + getPaddingRight() + mBound.width(); 
    break; 
  } 
  //同样逻辑处理高 
  setMeasuredDimension(width, height); 
} 
 @Override 
 protected void onDraw(Canvas canvas) { 
  mPaint.setColor(Color.YELLOW); 
  canvas.drawRect(0, 0, getMeasuredWidth(), getMeasuredHeight(), mPaint); 
  mPaint.setColor(mTextColor); 
  canvas.drawText(mText, getWidth() / 2 - mBound.width() / 2, getHeight() / 2 + mBound.height() / 2, mPaint); 
  Random random = new Random(); 
  for(int i = 0; i <= 3; i++){ 
   int temp = random.nextInt(colors.length); 
   mPaint.setColor(colors[temp]); 
   mPaint.setStrokeWidth(3); 
   canvas.drawLine(randomStartWidth(),randomStartHeight(),randomEndWidth(),randomEndHeight(),mPaint); 
  } 
 } 

Intent intent = new Intent(); 
intent.setAction("com.seu_calvin.update"); 
intent.putExtra("data", sb.toString()); 
getContext().sendBroadcast(intent);