实现了拖拽线的功能

连线功能建议薄荷马上更新

app/src/main/java/com/muqingedit/activity/Edit.java

@@ -23,8 +23,8 @@ public class Edit extends ActivityFragment {
         //绘制一个房间
         findViewById(R.id.button).setOnClickListener(view -> {
             fanjian button = new fanjian(Edit.this)
-                    .setLayoutParams(200, 200)
+                    .setLayoutParams(260, 250)
-                    .setXY(100, 100);
+                    .setXY(200, 100);
             frameLayout.addView(button);
         });
     }

app/src/main/java/com/muqingedit/fanjian.java

@@ -6,6 +6,7 @@ import android.graphics.Canvas;
 import android.graphics.Color;
 import android.graphics.Paint;
 import android.view.GestureDetector;
+import android.view.Gravity;
 import android.view.MotionEvent;
 import android.view.View;
 import android.view.ViewGroup;
@@ -31,37 +32,42 @@ public class fanjian extends FrameLayout {
         xian xian;
         public dian(Context context) {
             super(context);
-/*            ViewGroup.LayoutParams layoutParams = fanjian.this.getLayoutParams();
+            ViewGroup.LayoutParams aa = fanjian.this.getLayoutParams();
-            dian.this.setLayoutParams(
+            LayoutParams layoutParams = new LayoutParams(aa.width /3,
-                    new ViewGroup.LayoutParams(layoutParams.width / 2,
+                    aa.height / 3, Gravity.CENTER);
-                            layoutParams.width / 2));*/
+            this.setLayoutParams(layoutParams);
+//            setBackgroundColor(Color.WHITE);
         }
         @Override
         protected void onDraw(Canvas canvas) {
             super.onDraw(canvas);
-            Paint paint = new Paint();
+            @SuppressLint("DrawAllocation") Paint paint = new Paint();
             paint.setColor(Color.WHITE);
             paint.setStyle(Paint.Style.FILL);
-            float cx = getWidth() / 2f; // 圆心 x 坐标
+            paint.setAntiAlias(true);
-            float cy = getHeight() / 2f; // 圆心 y 坐标
+            int centerX = getWidth()/2;
-            float radius = 26F; // 圆的半径
+            int centerY = getHeight()/2;
-            canvas.drawCircle(cx, cy, radius, paint); // 绘制圆点
+            int radius = Math.min(centerX, centerY);
+            canvas.drawCircle(centerX, centerY, radius, paint);
         }
+        float ax, ay,csx, csy;
         @Override
         public boolean onTouchEvent(MotionEvent event) {
+            ax = event.getX();
+            ay = event.getY();
             switch (event.getAction()) {
                 case MotionEvent.ACTION_DOWN:
                     //在视图上面添加一条线
                     int[] location = new int[2];
-                    getLocationOnScreen(location);
+                    fanjian.this.getLocationOnScreen(location);
-                    int x = location[0] + getWidth() / 2;
+                    csx= (int) fanjian.this.getX() + fanjian.this.getWidth() / 2;
-                    int y = location[1] - getHeight() / 2;
+                    csy= (int) fanjian.this.getY() + fanjian.this.getHeight() / 2;
-                    xian = new xian(getContext()).createNewLine(x,
+                    xian = new xian(getContext()).createNewLine(csx, csy);
-                            y);
                     return true;
                 case MotionEvent.ACTION_MOVE:
                     //绘制线
-                    xian.updateCurrentLine(event.getRawX(), event.getRawY());
+                    xian.updateCurrentLine(csx + ax, csy + ay);
+//                    xian.updateCurrentLine(event.getRawX()-ax, event.getRawY()-ay);
                     return true;
                 case MotionEvent.ACTION_UP:
                     //删除线
@@ -70,7 +76,6 @@ public class fanjian extends FrameLayout {
                     xian = null;
                     return true;
             }
-
             return super.onTouchEvent(event);
         }
 
@@ -108,7 +113,6 @@ public class fanjian extends FrameLayout {
         gestureDetector.onTouchEvent(event);
         return true;
     }
-
     @SuppressLint("DrawAllocation")
     @Override
     protected void onDraw(Canvas canvas) {

app/src/main/res/layout/huabu.xml

@@ -1,15 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent">
-
-    <androidx.appcompat.widget.Toolbar
-        android:id="@+id/toolbar"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content" />
-
-    <FrameLayout
-        android:id="@+id/view"
-        android:layout_width="match_parent"
-        android:layout_height="match_parent" />
-</LinearLayout>