android实现九宫格程序

public class MainActivity extends AppCompatActivity {

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    NineView view = new NineView(this);
    setContentView(view);
    view.setOnPasswordFinishListener(new NineView.OnPasswordFinishListener() {
      @Override
      public void onPasswordFinish(String password) {
        Toast.makeText(getBaseContext(), "密码:" + password, Toast.LENGTH_SHORT).show();
      }
    });
  }
}

public class NineView extends View {
int width;
Paint paintback = new Paint();
Paint paintsrc = new Paint();
int background;
//保证是正方形
int max = 6; //密码的个数  6
int min = 4;
//点在哪里
float currX, currY;
public NineView(Context context) {
super(context);
init();
}
public NineView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public void init() {
paintback.setDither(true);
paintback.setAntiAlias(true);
paintsrc.setDither(true);
paintsrc.setAntiAlias(true);
//171625
background = Color.rgb(0x17, 0x16, 0x25);
paintback.setColor(background);
//3791E6
paintsrc.setColor(Color.rgb(0x37, 0x91, 0xe6));
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
width = getWidth() / 4;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//清屏
canvas.drawColor(background);
//划线
if (result.size()   0) {
//点
int x = result.get(result.size() - 1) % 3 + 1;
int y = result.get(result.size() - 1) / 3 + 1;
paintsrc.setStrokeWidth(10);
canvas.drawLine(x * width, y * width, currX, currY, paintsrc);
canvas.drawCircle(x * width, y * width, width / 3, paintback);
if (result.size()   1) {
//防止越界
for (int i = 0; i < result.size() - 1; i++) { // 1 2 3 <=2
//需要取当前的i和下一个i
//按住的前一个点
int x1 = result.get(i) % 3 + 1;
int y1 = result.get(i) / 3 + 1;
//按住的后一个点
int x2 = result.get(i + 1) % 3 + 1;
int y2 = result.get(i + 1) / 3 + 1;
paintsrc.setStrokeWidth(10);
canvas.drawLine(x1 * width, y1 * width, x2 * width, y2 * width, paintsrc);
canvas.drawCircle(x1 * width, y1 * width, width / 3, paintback);
}
}
}
paintsrc.setStrokeWidth(2);
//9个圆
paintsrc.setStyle(Paint.Style.STROKE);
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
canvas.drawCircle((i + 1) * width, (j + 1) * width, width / 3, paintsrc);
}
}
paintsrc.setStyle(Paint.Style.FILL);
for (Integer integer : result) {
//i j ; // 8  2 2
int j = integer / 3 + 1;
int i = integer % 3 + 1;
canvas.drawCircle(i * width, j * width, width / 8, paintsrc);
}
}
//密码
List<Integer  result = new ArrayList< ();
@Override
public boolean onTouchEvent(MotionEvent event) {
float x = event.getX();
float y = event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
//勾股定理
int i = isConnPoint(x, y);
//只要在园内
if (i != -1) {
result.add(i);
currX = x;
currY = y;
}
Log.e("TAG", "=====" + i);
break;
case MotionEvent.ACTION_MOVE:
currX = x;
currY = y;
//移动到其他的圆中，那么接着去添加result
int point = isConnPoint(x, y);
if (point != -1 && !result.contains((Integer) point)) {
result.add(point);
if (result.size()   max) {
//reslut清空
if (onPasswordFinishListener != null)
onPasswordFinishListener.onPasswordFinish(getPassword());
result.clear();
}
}
break;
case MotionEvent.ACTION_UP:
if (result.size()  = min) {
if (onPasswordFinishListener != null)
onPasswordFinishListener.onPasswordFinish(getPassword());
}
result.clear();
break;
}
invalidate();
return true;
}
public String getPassword() {
String password = "";
for (Integer integer : result) {
password += integer + "";
}
return password;
}
//判断
public int isConnPoint(float x, float y) {
//9  width,width width
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
if (pointOnCircle(x, y, (j + 1) * width, (i + 1) * width)) {
return i * 3 + j; //0-8
}
}
}
return -1;
}
public boolean pointOnCircle(float x, float y, int cx, int cy) {//true
Log.e("TAG", ((cx - x) * (cx - x) + (cy - y) * (cy - y)) + "");
Log.e("TAG", ((float) width / 3f) * ((float) width / 3f) + "");
float i = ((cx - x) * (cx - x) + (cy - y) * (cy - y));
float j = ((float) width / 3f) * ((float) width / 3f);
return i < j;
}
public void setOnPasswordFinishListener(OnPasswordFinishListener onPasswordFinishListener) {
this.onPasswordFinishListener = onPasswordFinishListener;
}
private OnPasswordFinishListener onPasswordFinishListener;
public interface OnPasswordFinishListener {
void onPasswordFinish(String password);
}
}