Tencent Matrix默認無法監測Application冷啟動的耗時方法，本文介紹了如何改造Matrix支持冷啟動耗時方法監測。讓你一分鐘就能給App啟動卡頓號脈。

1.1 在你項目根目錄下的 gradle.properties 中配置要依賴的 Matrix 版本號，如：

MATRIX_VERSION=1.0.0

1.2 在你項目根目錄下的 build.gradle 文件添加 Matrix 依賴，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 各模塊的依賴，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 falsebaseMethodMapFile = '${project.buildDir}/matrix_output/Debug.methodmap'blackListFile = '${project.projectDir}/matrixTrace/blackMethodList.txt' } }

1.4 實現 PluginListener，接收 Matrix 處理后的數據, 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 實現動態配置接口， 可修改 Matrix 內部參數. 在 sample-android 中 我們有個簡單的動態接口實例DynamicConfigImplDemo.java, 其中參數對應的 key 位于文件 MatrixEnum中， 摘抄部分示例如下：

class MatrixConfig : IDynamicConfig { val isFPSEnable: Booleanget() = true val isTraceEnable: Booleanget() = true val isMatrixEnable: Booleanget() = true override fun get(key: String, defStr: String): String {// for Activity leak detectif (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 選擇程序啟動的位置對 Matrix 進行初始化，如在 Application 的繼承類中， Init 核心邏輯如下：

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子類

2.1 模擬Application卡頓

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()調用卡頓方法

override fun onCreate() { A()}

2.3 反射獲取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 將原來的onCreate的方法調用轉入匿名內部類調用

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

2.5 重寫Application onCreate方法

override fun onCreate() { super.onCreate() //重點 mHandler.postAtFrontOfQueue(ApplicationTask())}3.運行，快速定位

3.1 關鍵字'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':'0,1048574,1,1344n1,5471,1,1338n2,17582,1,1338n3,17558,1,1338n4,17560,1,379n5,17562,1,160n6,17563,1,17n6,17566,1,20n6,17568,1,20n5,17569,1,20n4,17573,1,56n5,17575,1,21n5,17576,1,5n5,17578,1,10n4,17580,1,102n','stackKey':'17558|','tag':'Trace_EvilMethod','process':'com.peter.viewgrouptutorial','time':1624837969986}]

3.2 解析日志 打印卡頓堆棧

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

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