android实现九宫格程序

本文实例为大家分享了Android九宫格展示的具体代码，供大家参考，具体内容如下

（设置的有最少连几个和最大连几个）

MainActivity

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();
     }
   });
 }
}

NineView

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);
 }

}

来源：https://blog.csdn.net/dr_abandon/article/details/53944106