create DragAndDraw project and update some codes

draganddraw/.gitignore

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+/build

draganddraw/build.gradle

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+plugins {
+    id 'com.android.application'
+    id 'org.jetbrains.kotlin.android'
+}
+
+android {
+    namespace 'com.yn.draganddraw'
+    compileSdk 33
+
+    defaultConfig {
+        applicationId "com.yn.draganddraw"
+        minSdk 21
+        targetSdk 33
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+}
+
+dependencies {
+
+    implementation 'androidx.core:core-ktx:1.8.0'
+    implementation 'androidx.appcompat:appcompat:1.6.1'
+    implementation 'com.google.android.material:material:1.5.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
+    testImplementation 'junit:junit:4.13.2'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.5'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
+}

draganddraw/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

draganddraw/src/androidTest/java/com/yn/draganddraw/ExampleInstrumentedTest.kt

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+package com.yn.draganddraw
+
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.ext.junit.runners.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+        assertEquals("com.yn.draganddraw", appContext.packageName)
+    }
+}

draganddraw/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.AndroidGuideApp">
+        <activity
+            android:name=".DragAndDrawActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

draganddraw/src/main/java/com/yn/draganddraw/Box.kt

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+package com.yn.draganddraw
+
+import android.graphics.PointF
+
+/**
+ * Description：
+ * @author Created by pengyanni
+ * @e-mail [email protected]
+ * @time   2023/6/29 17:00
+ */
+class Box(val start: PointF) {
+
+    var end: PointF = start
+
+    val left: Float get() = Math.min(start.x, end.x)
+
+    val right: Float get() = Math.max(start.x, end.x)
+
+    val top: Float get() = Math.min(start.y, end.y)
+
+    val bottom: Float get() = Math.max(start.y, end.y)
+}

draganddraw/src/main/java/com/yn/draganddraw/BoxDrawingView.kt

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+package com.yn.draganddraw
+
+import android.content.Context
+import android.graphics.Canvas
+import android.graphics.Paint
+import android.graphics.PointF
+import android.util.AttributeSet
+import android.util.Log
+import android.view.MotionEvent
+import android.view.View
+
+/**
+ * Description：
+ * @author Created by pengyanni
+ * @e-mail [email protected]
+ * @time   2023/6/29 16:18
+ */
+private const val TAG = "BoxDrawingView"
+
+class BoxDrawingView(context: Context, attrs: AttributeSet? = null) : View(context, attrs) {
+
+    private var currentBox: Box? = null
+    private val boxen = mutableListOf<Box>()
+
+    override fun onTouchEvent(event: MotionEvent): Boolean {
+        val current = PointF(event.x, event.y)
+        var action = ""
+        when (event.action) {
+            MotionEvent.ACTION_DOWN -> {
+                action = "ACTION_DOWN"
+                currentBox = Box(current).also { boxen.add(it) }
+            }
+
+            MotionEvent.ACTION_MOVE -> {
+                action = "ACTION_MOVE"
+                updateCurrentBox(current)
+            }
+
+            MotionEvent.ACTION_UP -> {
+                action = "ACTION_UP"
+                updateCurrentBox(current)
+                currentBox = null
+            }
+
+            MotionEvent.ACTION_CANCEL -> {
+                action = "ACTION_CANCEL"
+                currentBox = null
+            }
+        }
+        Log.i(TAG, "$action at x = ${current.x},y=${current.y}")
+        return true
+    }
+
+    override fun onDraw(canvas: Canvas) {
+        super.onDraw(canvas)
+    }
+
+    private fun updateCurrentBox(current: PointF) {
+        currentBox?.let {
+            it.end = current
+            invalidate()
+        }
+    }
+}

draganddraw/src/main/java/com/yn/draganddraw/DragAndDrawActivity.kt

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+package com.yn.draganddraw
+
+import androidx.appcompat.app.AppCompatActivity
+import android.os.Bundle
+
+class DragAndDrawActivity : AppCompatActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_drag_and_draw)
+    }
+}

draganddraw/src/main/res/drawable-v24/ic_launcher_foreground.xml

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+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path android:pathData="M31,63.928c0,0 6.4,-11 12.1,-13.1c7.2,-2.6 26,-1.4 26,-1.4l38.1,38.1L107,108.928l-32,-1L31,63.928z">
+        <aapt:attr name="android:fillColor">
+            <gradient
+                android:endX="85.84757"
+                android:endY="92.4963"
+                android:startX="42.9492"
+                android:startY="49.59793"
+                android:type="linear">
+                <item
+                    android:color="#44000000"
+                    android:offset="0.0" />
+                <item
+                    android:color="#00000000"
+                    android:offset="1.0" />
+            </gradient>
+        </aapt:attr>
+    </path>
+    <path
+        android:fillColor="#FFFFFF"
+        android:fillType="nonZero"
+        android:pathData="M65.3,45.828l3.8,-6.6c0.2,-0.4 0.1,-0.9 -0.3,-1.1c-0.4,-0.2 -0.9,-0.1 -1.1,0.3l-3.9,6.7c-6.3,-2.8 -13.4,-2.8 -19.7,0l-3.9,-6.7c-0.2,-0.4 -0.7,-0.5 -1.1,-0.3C38.8,38.328 38.7,38.828 38.9,39.228l3.8,6.6C36.2,49.428 31.7,56.028 31,63.928h46C76.3,56.028 71.8,49.428 65.3,45.828zM43.4,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2c-0.3,-0.7 -0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C45.3,56.528 44.5,57.328 43.4,57.328L43.4,57.328zM64.6,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2s-0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C66.5,56.528 65.6,57.328 64.6,57.328L64.6,57.328z"
+        android:strokeWidth="1"
+        android:strokeColor="#00000000" />
+</vector>