chapter04 Hprof 内存分析作业

build.gradle

@@ -1,6 +1,8 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
-buildscript {
+buildscript { 
+    ext.kotlin_version = '1.3.11'
+
     repositories {
         google()
         jcenter()
@@ -11,7 +13,7 @@ buildscript {
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
-    }
+    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version" }
 }
 
 allprojects {

hprofanalyze/src/androidTest/java/com/ld/hprofanalyze/ExampleInstrumentedTest.kt

@@ -0,0 +1,24 @@
+package com.ld.hprofanalyze
+
+import android.support.test.InstrumentationRegistry
+import android.support.test.runner.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.getTargetContext()
+        assertEquals("com.ld.hprofanalyze", appContext.packageName)
+    }
+}

hprofanalyze/src/main/java/com/ld/hprofanalyze/TestActivity.kt

@@ -0,0 +1,149 @@
+package com.ld.hprofanalyze
+
+import android.Manifest
+import android.content.pm.PackageManager
+import android.graphics.BitmapFactory
+import android.support.v7.app.AppCompatActivity
+import android.os.Bundle
+import android.os.Debug
+import android.os.Environment
+import android.support.v4.app.ActivityCompat
+import android.support.v4.content.ContextCompat
+import com.squareup.haha.perflib.io.MemoryMappedFileBuffer
+import kotlinx.android.synthetic.main.activity_test.*
+import java.io.File
+import java.util.*
+import kotlin.collections.ArrayList
+import android.util.Log
+import com.squareup.haha.perflib.*
+import java.lang.StringBuilder
+import java.lang.reflect.Array
+
+
+private const val WRITE_EXTERNAL_STORAGE_REQUEST_CODE = 100
+private const val TAG = "TestActivity"
+
+class TestActivity : AppCompatActivity() {
+    private var externalReportPath: File? = null
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_test)
+        if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
+            ActivityCompat.requestPermissions(
+                    this,
+                    arrayOf(Manifest.permission.WRITE_EXTERNAL_STORAGE),
+                    WRITE_EXTERNAL_STORAGE_REQUEST_CODE)
+        } else {
+            initExternalReportPath()
+            afterPermissionGrant()
+
+        }
+
+    }
+
+    override fun onRequestPermissionsResult(
+            requestCode: Int, permissions: kotlin.Array<String>, grantResults: IntArray) {
+        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
+        initExternalReportPath()
+        afterPermissionGrant()
+    }
+
+    private fun initExternalReportPath() {
+        externalReportPath = File(Environment.getExternalStorageDirectory(), "hprofdir")
+        if (externalReportPath?.exists() ?: false) {
+            externalReportPath?.mkdirs()
+        }
+
+    }
+
+    private fun afterPermissionGrant() {
+//        1、构造内存泄漏（重复加载同一张图片）
+        var bitmap1 = BitmapFactory.decodeResource(resources, R.drawable.test)
+        image1.setImageBitmap(bitmap1)
+        var bitmap2 = BitmapFactory.decodeResource(resources, R.drawable.test)
+        image2.setImageBitmap(bitmap2)
+        var bitmap3 = BitmapFactory.decodeResource(resources, R.drawable.test)
+        image3.setImageBitmap(bitmap3)
+        var bitmap4 = BitmapFactory.decodeResource(resources, R.drawable.test)
+        image4.setImageBitmap(bitmap4)
+        dump.setOnClickListener {
+            Debug.dumpHprofData(externalReportPath?.absolutePath)
+        }
+        parse.setOnClickListener {
+            //            2、Haha库使用，生成内存快照。
+            var memoryMappedFileBuffer = MemoryMappedFileBuffer(externalReportPath)
+            var hprofParser = HprofParser(memoryMappedFileBuffer)
+            var snapshot = hprofParser.parse()
+            snapshot.computeDominators()
+            var heaps = snapshot.heaps
+            heaps = heaps.filter {
+                it.name.equals("app") || it.name.equals("default")
+            }
+//            3、获取bitmap相关的对象的内存快照。
+            var bitmapClass = snapshot.findClass("android.graphics.Bitmap")
+            var bitmaplist = arrayListOf<Instance>()
+            heaps.forEach {
+                bitmaplist.addAll(bitmapClass.getHeapInstances(it.id))
+            }
+            var bitmapMapToBuffer = mutableMapOf<Instance, ArrayInstance>()
+//            4、构建map   key：bitmap内存映射对象，value：bitmap Class 的mbuffer字段值
+            bitmaplist.forEach {
+                (it as ClassInstance).values.forEach { buffer ->
+                    if (buffer.field.name.equals("mBuffer")) {
+                        bitmapMapToBuffer[it] = buffer.value as ArrayInstance
+                    }
+                }
+            }
+//            5、构建map key:步骤4中的mbuffer字段的数组的hashcode,value:拥有相同hashcode的Instance 集合。
+            var result = mutableMapOf<Int, ArrayList<Instance>>()
+            bitmapMapToBuffer.forEach { instance, byteBuffer ->
+                var hashCode = Arrays.hashCode(byteBuffer.values)
+                if (result.containsKey(hashCode)) {
+                    result[hashCode]?.add(instance)
+                } else {
+                    result[hashCode] = arrayListOf(instance)
+                }
+            }
+//            6、过滤步骤5中map，如果value（list）的size大于1，就表示有多个instance的mbuffer是一样的，就可以被认为是内存泄漏了。
+            var filterResult = result.filter {
+                it.component2().size > 1
+            }
+            Log.d(TAG, "发现重复bitmap 数量为 ${filterResult.size}")
+//             7、获取bitmap的宽高和buffer长度
+            filterResult.forEach { hashcode, instances ->
+                var leak = LeakObjectDetaial()
+                instances.forEach {
+                    (it as ClassInstance).values.forEach { fieldValue ->
+                        leak.leakCount++
+                        when (fieldValue.field.name) {
+                            "mWidth" -> leak.width = fieldValue.value as Int
+                            "mHeight" -> leak.height = fieldValue.value as Int
+                            "mBuffer" -> leak.bufferSize = (fieldValue.value as ArrayInstance).values.size
+                        }
+                    }
+//                    8、获取bitmap的引用链。
+                    var stackFrame = StringBuilder()
+                    stackFrame.append(it.classObj.className).append("\n")
+                    var nextInstanceToGcRoot = it.nextInstanceToGcRoot
+                    while (nextInstanceToGcRoot != null) {
+                        nextInstanceToGcRoot.classObj
+                        stackFrame.insert(0, nextInstanceToGcRoot.classObj.className + "\n")
+                        nextInstanceToGcRoot = nextInstanceToGcRoot.nextInstanceToGcRoot
+                    }
+                    leak.stacks = stackFrame.toString()
+                    Log.d(TAG, "width:${leak.width},height:${leak.height},buffersize:${leak.bufferSize},stack:${leak.stacks}")
+                }
+            }
+        }
+    }
+
+    class LeakObjectDetaial {
+        var leakCount: Int = 0
+        var stacks: String = ""
+        var width: Int = 0
+        var height: Int = 0
+        var bufferSize: Int = 0
+    }
+
+}

hprofanalyze/src/main/res/layout/activity_main2.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".Main2Activity">
+
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Hello World!"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+</android.support.constraint.ConstraintLayout>

hprofanalyze/src/main/res/layout/activity_test.xml

@@ -0,0 +1,68 @@
+<?xml version="1.0" encoding="utf-8"?>
+<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".TestActivity">
+
+
+    <ImageView
+        android:id="@+id/image1"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        app:layout_constraintHorizontal_chainStyle="spread"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toLeftOf="@id/image2"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <ImageView
+        android:id="@+id/image2"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        app:layout_constraintLeft_toRightOf="@id/image1"
+        app:layout_constraintRight_toLeftOf="@id/image3"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <ImageView
+        android:id="@+id/image3"
+        android:layout_width="0dp"
+
+        android:layout_height="wrap_content"
+        app:layout_constraintLeft_toRightOf="@id/image2"
+        app:layout_constraintRight_toLeftOf="@id/image4"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <ImageView
+        android:id="@+id/image4"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        app:layout_constraintLeft_toRightOf="@id/image3"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+
+    <Button
+        android:id="@+id/dump"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="DumpHprof文件"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.2" />
+
+    <Button
+        android:id="@+id/parse"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="分析Hprof文件"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.8" />
+
+
+</android.support.constraint.ConstraintLayout>

hprofanalyze/src/test/java/com/ld/hprofanalyze/ExampleUnitTest.kt

@@ -0,0 +1,17 @@
+package com.ld.hprofanalyze
+
+import org.junit.Test
+
+import org.junit.Assert.*
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+class ExampleUnitTest {
+    @Test
+    fun addition_isCorrect() {
+        assertEquals(4, 2 + 2)
+    }
+}

settings.gradle

@@ -1 +1 @@
-include ':DuplicatedBitmapAnalyzer'
+include ':DuplicatedBitmapAnalyzer', ':hprofanalyze'