使用Android自定义控件实现滑动解锁九宫格

/**
 * 九宫格
 */
public class NineGridView extends View {
  private int width;//该控件的宽
  private int height;//该控件的高
  private Paint mPaintBigCircle;//用于画外圆
  private Paint mPaintSmallCircle;//用于画内圆
  private Paint mPaintLine;//用于画线
  private Paint mPaintText;//用于画文本
  private Path path;//手势划线时需要用到它
  private Map pointContainer;//存储九个点的坐标
  private List pointerSlipped;//存储得到的九宫格密码
  public List getPointerSlipped() {
    return pointerSlipped;
  }
  public void setPointerSlipped(List pointerSlipped) {
    this.pointerSlipped = pointerSlipped;
  }
  public NineGridView(Context context) {
    super(context);
  }
  public NineGridView(Context context, AttributeSet attrs) {
    super(context, attrs);
    mPaintBigCircle = new Paint();
    mPaintBigCircle.setColor(Color.BLUE);
    mPaintBigCircle.setStyle(Paint.Style.STROKE);//不充满
    mPaintBigCircle.setAntiAlias(true);//抗锯齿打开
    mPaintSmallCircle = new Paint();
    mPaintSmallCircle.setColor(Color.GREEN);
    mPaintSmallCircle.setStyle(Paint.Style.FILL);//充满，即画的几何体为实心
    mPaintSmallCircle.setAntiAlias(true);
    mPaintLine = new Paint();
    mPaintLine.setColor(Color.GREEN);
    mPaintLine.setStyle(Paint.Style.STROKE);
    mPaintLine.setStrokeWidth(20);
    mPaintLine.setAntiAlias(true);
    mPaintText = new Paint();
    mPaintText.setColor(Color.WHITE);
    mPaintText.setTextAlign(Paint.Align.CENTER);//向中央对齐
    mPaintText.setTextSize(50);
    mPaintText.setAntiAlias(true);
    path = new Path();
    pointCOntainer= new HashMap<>();
    pointerSlipped = new ArrayList<>();
  }
  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    width = getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec);
    height = getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec);
  }
  private float pivotX;//触屏得到的x坐标
  private float pivotY;//触屏得到的y坐标
  private float selectedX;//当前选中的圆点的x坐标
  private float selectedY;//当前选中的圆点的y坐标
  private float selectedXOld;//从前选中的圆点的x坐标
  private float selectedYOld;//从前选中的圆点的y坐标
  private boolean isHasMoved = false;//用于判断path是否调用过moveTo()方法
  @Override
  public boolean onTouchEvent(MotionEvent event) {
    switch (event.getAction()) {
      case MotionEvent.ACTION_DOWN:
        pivotX = event.getX();
        pivotY = event.getY();
        //每次触屏时需要清空一下pointerSlipped，即重置密码
        pointerSlipped.clear();
        Log.d("pointTouched", pivotX + "," + pivotY);
        getSelectedPointIndex(pivotX, pivotY);
        invalidate();//重绘
        break;
      case MotionEvent.ACTION_MOVE:
        pivotX = event.getX();
        pivotY = event.getY();
        getSelectedPointIndex(pivotX, pivotY);
        invalidate();
        break;
      case MotionEvent.ACTION_UP:
        /**
         * 当手指离开屏幕时，重置path
         */
        path.reset();
        isHasMoved = false;
        String indexSequence = "";
        //打印出上一次手势密码的值
        for(int index:pointerSlipped){
          indexSequence += "/"+index;
        }
        Log.d("index",indexSequence);
        break;
    }
    invalidate();
    return true;
  }
  /**
   * 得到并存储经过的圆点的序号
   * @param pivotX
   * @param pivotY
   */
  private void getSelectedPointIndex(float pivotX, float pivotY) {
    int index = 0;
    if (pivotX > patternMargin && pivotX  height / 2 && pivotY  height / 2 + added && pivotY  height / 2 + added * 2 && pivotY  patternMargin + added && pivotX  height / 2 && pivotY  height / 2 + added && pivotY  height / 2 + added * 2 && pivotY  patternMargin + added * 2 && pivotX  height / 2 && pivotY  height / 2 + added && pivotY  height / 2 + added * 2 && pivotY 

public class SizeConvert {
  /**
   * 将dp转换为sp
   */
  public static int dip2px(Context context, float dipValue){
    final float scale = context.getResources().getDisplayMetrics().density;
    return (int)(dipValue * scale + 0.5f);
  }
  /**
   * sp转dp
   */
  public static int px2dip(Context context, float pxValue){
    final float scale = context.getResources().getDisplayMetrics().density;
    return (int)(pxValue / scale + 0.5f);
  }
}

public class NineGridActivity extends BaseActivity{
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.view_nine_grid);
  }
}

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