一分钟快速定位Android启动耗时问题

前言

Tencent Matrix默认无法监测Application冷启动的耗时方法，本文介绍了如何改造Matrix支持冷启动耗时方法监测。让你一分钟就能给App启动卡顿号脉。

1. 接入Tencent Matrix

1.1 在你项目根目录下的 gradle.properties 中配置要依赖的 Matrix 版本号，如：

MATRIX_VERSION=1.0.0

1.2 在你项目根目录下的 build.gradle 文件添加 Matrix 依赖，如：

dependencies {
      classpath ("com.tencent.matrix:matrix-gradle-plugin:${MATRIX_VERSION}") { changing = true }
  }

1.3 在 app/build.gradle 文件中添加 Matrix 各模块的依赖，如：

  dependencies {
    implementation group: "com.tencent.matrix", name: "matrix-android-lib", version: MATRIX_VERSION, changing: true
    implementation group: "com.tencent.matrix", name: "matrix-android-commons", version: MATRIX_VERSION, changing: true
    implementation group: "com.tencent.matrix", name: "matrix-trace-canary", version: MATRIX_VERSION, changing: true
    implementation group: "com.tencent.matrix", name: "matrix-resource-canary-android", version: MATRIX_VERSION, changing: true
    implementation group: "com.tencent.matrix", name: "matrix-resource-canary-common", version: MATRIX_VERSION, changing: true
    implementation group: "com.tencent.matrix", name: "matrix-io-canary", version: MATRIX_VERSION, changing: true
    implementation group: "com.tencent.matrix", name: "matrix-sqlite-lint-android-sdk", version: MATRIX_VERSION, changing: true
    implementation group: "com.tencent.matrix", name: "matrix-battery-canary", version: MATRIX_VERSION, changing: true
    implementation group: "com.tencent.matrix", name: "matrix-hooks", version: MATRIX_VERSION, changing: true
  }

  apply plugin: 'com.tencent.matrix-plugin'
  matrix {
    trace {
        enable = true	//if you don't want to use trace canary, set false
        baseMethodMapFile = "${project.buildDir}/matrix_output/Debug.methodmap"
        blackListFile = "${project.projectDir}/matrixTrace/blackMethodList.txt"
    }
  }

1.4 实现 PluginListener，接收 Matrix 处理后的数据, 如：

class MatrixListener(context: Context?) : DefaultPluginListener(context) {
    companion object {
        const val TAG: String = "Matrix.TestPluginListener"
    }

    override fun onReportIssue(issue: Issue) {
        super.onReportIssue(issue)
        MatrixLog.e(TAG, issue.toString())

    }
}

1.5 实现动态配置接口，可修改 Matrix 内部参数. 在 sample-android 中我们有个简单的动态接口实例DynamicConfigImplDemo.java, 其中参数对应的 key 位于文件 MatrixEnum中，摘抄部分示例如下：

  class MatrixConfig : IDynamicConfig {
    val isFPSEnable: Boolean
        get() = true
    val isTraceEnable: Boolean
        get() = true
    val isMatrixEnable: Boolean
        get() = true

    override fun get(key: String, defStr: String): String {

        // for Activity leak detect
        if (ExptEnum.clicfg_matrix_resource_detect_interval_millis.name == key || ExptEnum.clicfg_matrix_resource_detect_interval_millis_bg.name == key) {
            Log.d(
                "DynamicConfig",
                "Matrix.ActivityRefWatcher: clicfg_matrix_resource_detect_interval_millis 10s"
            )
            return TimeUnit.SECONDS.toMillis(5).toString()
        }
        if (ExptEnum.clicfg_matrix_resource_max_detect_times.name == key) {
            Log.d(
                "DynamicConfig",
                "Matrix.ActivityRefWatcher: clicfg_matrix_resource_max_detect_times 5"
            )
            return 3.toString()
        }
        return defStr
    }

    override fun get(key: String, defInt: Int): Int {
        //TODO here return default value which is inside sdk, you can change it as you wish. matrix-sdk-key in class MatrixEnum.
        if (MatrixEnum.clicfg_matrix_resource_max_detect_times.name == key) {
            MatrixLog.i(TAG, "key:$key, before change:$defInt, after change, value:2")
            return 2 //new value
        }
        if (MatrixEnum.clicfg_matrix_trace_fps_report_threshold.name == key) {
            return 10000
        }
        if (MatrixEnum.clicfg_matrix_trace_fps_time_slice.name == key) {
            return 12000
        }
        if (ExptEnum.clicfg_matrix_trace_app_start_up_threshold.name == key) {
            return 3000
        }
        return if (ExptEnum.clicfg_matrix_trace_evil_method_threshold.name == key) {
            200
        } else defInt
    }

    override fun get(key: String, defLong: Long): Long {
        //TODO here return default value which is inside sdk, you can change it as you wish. matrix-sdk-key in class MatrixEnum.
        if (MatrixEnum.clicfg_matrix_trace_fps_report_threshold.name == key) {
            return 10000L
        }
        if (MatrixEnum.clicfg_matrix_resource_detect_interval_millis.name == key) {
            MatrixLog.i(TAG, "$key, before change:$defLong, after change, value:2000")
            return 2000
        }
        return defLong
    }

    override fun get(key: String, defBool: Boolean): Boolean {
        //TODO here return default value which is inside sdk, you can change it as you wish. matrix-sdk-key in class MatrixEnum.
        return defBool
    }

    override fun get(key: String, defFloat: Float): Float {
        //TODO here return default value which is inside sdk, you can change it as you wish. matrix-sdk-key in class MatrixEnum.
        return defFloat
    }

    companion object {
        private const val TAG = "Matrix.DynamicConfigImplDemo"
    }
}

1.6 选择程序启动的位置对 Matrix 进行初始化，如在 Application 的继承类中， Init 核心逻辑如下：

  Matrix.Builder builder = new Matrix.Builder(application); // build matrix
  builder.patchListener(new TestPluginListener(this)); // add general pluginListener
  DynamicConfigImplDemo dynamicConfig = new DynamicConfigImplDemo(); // dynamic config
  
  // init plugin 
  IOCanaryPlugin ioCanaryPlugin = new IOCanaryPlugin(new IOConfig.Builder()
                    .dynamicConfig(dynamicConfig)
                    .build());
  //add to matrix               
  builder.plugin(ioCanaryPlugin);
  
  //init matrix
  Matrix.init(builder.build());

  // start plugin 
  ioCanaryPlugin.start();

2. 改造Application子类

2.1 模拟Application卡顿

private fun A() {
        B()
        H()
        L()
        SystemClock.sleep(800)
    }

    private fun B() {
        C()
        G()
        SystemClock.sleep(200)
    }

    private fun C() {
        D()
        E()
        F()
        SystemClock.sleep(100)
    }

    private fun D() {
        SystemClock.sleep(20)
    }

    private fun E() {
        SystemClock.sleep(20)
    }

    private fun F() {
        SystemClock.sleep(20)
    }

    private fun G() {
        SystemClock.sleep(20)
    }

    private fun H() {
        SystemClock.sleep(20)
        I()
        J()
        K()
    }

    private fun I() {
        SystemClock.sleep(20)
    }

    private fun J() {
        SystemClock.sleep(6)
    }

    private fun K() {
        SystemClock.sleep(10)
    }


    private fun L() {
        SystemClock.sleep(10000)
    }

2.2 Application.onCreate()调用卡顿方法

override fun onCreate() {
  A()
}

2.3 反射获取ActivityThread的mHandler

override fun attachBaseContext(base: Context?) {
      super.attachBaseContext(base)
      println("zijiexiaozhan MyApp attachBaseContext")
      time1 = SystemClock.uptimeMillis()
      time3 = System.currentTimeMillis()

      try {
          val forName = Class.forName("android.app.ActivityThread")
          val field = forName.getDeclaredField("sCurrentActivityThread")
          field.isAccessible = true
          val activityThreadValue = field[forName]
          val mH = forName.getDeclaredField("mH")
          mH.isAccessible = true
          val handler = mH[activityThreadValue]
          mHandler = handler as Handler
      } catch (e: Exception) {
      }
}

2.4 将原来的onCreate的方法调用转入匿名内部类调用

inner class ApplicationTask : Runnable {
    override fun run() {
        A()
    }
}

2.5 重写Application onCreate方法

override fun onCreate() {
    super.onCreate()
    //重点
    mHandler.postAtFrontOfQueue(ApplicationTask())
}

3.运行，快速定位

3.1 关键字"Trace_EvilMethod"查找日志

tag[Trace_EvilMethod]type[0];key[null];content[{"machine":"MIDDLE","cpu_app":0,"mem":3822452736,"mem_free":1164132,"detail":"NORMAL","cost":1344,"usage":"0.37%","scene":"default","stack":"0,1048574,1,1344\n1,5471,1,1338\n2,17582,1,1338\n3,17558,1,1338\n4,17560,1,379\n5,17562,1,160\n6,17563,1,17\n6,17566,1,20\n6,17568,1,20\n5,17569,1,20\n4,17573,1,56\n5,17575,1,21\n5,17576,1,5\n5,17578,1,10\n4,17580,1,102\n","stackKey":"17558|","tag":"Trace_EvilMethod","process":"com.peter.viewgrouptutorial","time":1624837969986}]

3.2 解析日志打印卡顿堆栈

android.os.Handler dispatchMessage 1344
.com.peter.viewgrouptutorial.MyApp$ApplicationTask run 1338
..com.peter.viewgrouptutorial.MyApp access$A 1338
...com.peter.viewgrouptutorial.MyApp A 1338
....com.peter.viewgrouptutorial.MyApp B 379
.....com.peter.viewgrouptutorial.MyApp C 160
......com.peter.viewgrouptutorial.MyApp D 17
......com.peter.viewgrouptutorial.MyApp E 20
......com.peter.viewgrouptutorial.MyApp F 20
.....com.peter.viewgrouptutorial.MyApp G 20
....com.peter.viewgrouptutorial.MyApp H 56
.....com.peter.viewgrouptutorial.MyApp I 21
.....com.peter.viewgrouptutorial.MyApp J 5
.....com.peter.viewgrouptutorial.MyApp K 10
....com.peter.viewgrouptutorial.MyApp L 102

总结

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