（六十九）探究如何让Service anr?

程序员文章站 2022-07-15 12:06:23

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demo地址：https://github.com/happyjiatai/demo_csdn/tree/master/demo_69_service

参考：

1.（六十五）Android O StartService的 anr timeout 流程分析

2. （七十）Android O Service启动流程梳理——bindService

3. （六十四）Android O Service启动流程梳理——startService

4. Android中bindService的细节之二：从进程的角度分析绑定Service的流程【Service所在进程已存在】

1.起因

最近在看Service的启动源码，涉及anr这块，发生anr是统计了特定方法执行时间，如果超过限定值，则anr，和我之前想的不大一样。简单地让Service anr的做法是在onCreate或者onStartCommand或者onBind或者onUnbind或者onDestroy中执行20s+的操作，则anr，不需要几者累加大于20s，统计是分开统计的，和几者耗时之和没有关系，以上耗时之和可以大于20s。（后台Service是200s）

2.测试demo

写了个demo:

布局：

<?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=".MainActivity">

    <Button
        android:id="@+id/buttonStart"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:text="startService"
        app:layout_constraintBottom_toTopOf="@+id/buttonBind"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.219" />

    <Button
        android:id="@+id/buttonBind"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="268dp"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        android:text="bindService"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />
</android.support.constraint.ConstraintLayout>

string

<resources>
    <string name="app_name">Demo_69_service</string>
    <string name="channel_name">channel_name</string>
    <string name="channel_description">channel_description</string>
</resources>

AndroidManifest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.demo_69_service">

    <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/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <service
            android:name=".MyService"
            android:enabled="true"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.csdnservice" />

                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </service>
    </application>

</manifest>

Activity

package com.example.demo_69_service;

import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {
    private static final String TAG = "demo69_activity";
    private MyService myService;
    private boolean isBound = false;

    private ServiceConnection conn = new ServiceConnection() {

        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            Log.d(TAG, "onServiceConnected", new RuntimeException());
            isBound = true;
            MyService.MyBinder binder = (MyService.MyBinder) service;
            myService = binder.getService();
        }

        //client 和service连接意外丢失时，会调用该方法
        @Override
        public void onServiceDisconnected(ComponentName name) {
            Log.d(TAG, "onServiceDisconnected", new RuntimeException());
        }

    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final Intent serviceIntent = new Intent("android.intent.action.csdnservice");
        serviceIntent.setPackage("com.example.demo_69_service");
        Button btnForStartService = findViewById(R.id.buttonStart);
        btnForStartService.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startForegroundService(serviceIntent);
            }
        });
        Button btnForBindService = findViewById(R.id.buttonBind);
        btnForBindService.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                bindService(serviceIntent, conn, BIND_AUTO_CREATE);
            }
        });
    }


}

Service:

package com.example.demo_69_service;

import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.os.Binder;
import android.os.IBinder;
import android.util.Log;

public class MyService extends Service {
    private static final String TAG = "demo69_service";
    private MyBinder Ibind = new MyBinder();

    public class MyBinder extends Binder {

        public MyService getService() {
            return MyService.this;
        }
    }

    public MyService() {
    }

    @Override
    public void onCreate() {
        super.onCreate();
        Log.d(TAG, "onCreate", new RuntimeException());
        createNotificationChannel();

    }

    @Override
    public IBinder onBind(Intent intent) {
        Log.d(TAG, "onBind", new RuntimeException());
        return Ibind;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.d(TAG, "onStartCommand", new RuntimeException());
        return super.onStartCommand(intent, flags, startId);
    }

    private void createNotificationChannel() {
        NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        // 通知渠道的id
        String id = "my_channel_01";
        // 用户可以看到的通知渠道的名字.
        CharSequence name = getString(R.string.channel_name);
//         用户可以看到的通知渠道的描述
        String description = getString(R.string.channel_description);
        int importance = NotificationManager.IMPORTANCE_HIGH;
        NotificationChannel mChannel = new NotificationChannel(id, name, importance);
//         配置通知渠道的属性
        mChannel.setDescription(description);
//         设置通知出现时的闪灯（如果 android 设备支持的话）
        mChannel.enableLights(true); mChannel.setLightColor(Color.RED);
//         设置通知出现时的震动（如果 android 设备支持的话）
        mChannel.enableVibration(true);
        mChannel.setVibrationPattern(new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400});
//         最后在notificationmanager中创建该通知渠道 //
        mNotificationManager.createNotificationChannel(mChannel);

        // 为该通知设置一个id
        int notifyID = 1;
        // 通知渠道的id
        String CHANNEL_ID = "my_channel_01";
        // Create a notification and set the notification channel.
        Notification notification = new Notification.Builder(this)
                .setContentTitle("New Message") .setContentText("You've received new messages.")
                .setSmallIcon(R.drawable.ic_launcher_foreground)
                .setChannelId(CHANNEL_ID)
                .build();
        startForeground(1,notification);
    }
}

3.测试

3.1 startService

07-13 23:51:43.602 6525-6525/com.example.demo_69_service D/demo69_service: onCreate
    java.lang.RuntimeException
        at com.example.demo_69_service.MyService.onCreate(MyService.java:31)
        at android.app.ActivityThread.handleCreateService(ActivityThread.java:3442)
        at android.app.ActivityThread.-wrap4(Unknown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1711)
        at android.os.Handler.dispatchMessage(Handler.java:105)
        at android.os.Looper.loop(Looper.java:171)
        at android.app.ActivityThread.main(ActivityThread.java:6684)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:246)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:783)
07-13 23:51:43.616 6525-6525/com.example.demo_69_service D/demo69_service: onStartCommand
    java.lang.RuntimeException
        at com.example.demo_69_service.MyService.onStartCommand(MyService.java:44)
        at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3577)
        at android.app.ActivityThread.-wrap20(Unknown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1726)
        at android.os.Handler.dispatchMessage(Handler.java:105)
        at android.os.Looper.loop(Looper.java:171)
        at android.app.ActivityThread.main(ActivityThread.java:6684)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:246)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:783)

3.2 bindService

07-14 13:08:12.852 3992-3992/com.example.demo_69_service D/demo69_service: onCreate
    java.lang.RuntimeException
        at com.example.demo_69_service.MyService.onCreate(MyService.java:31)
        at android.app.ActivityThread.handleCreateService(ActivityThread.java:3442)
        at android.app.ActivityThread.-wrap4(Unknown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1711)
        at android.os.Handler.dispatchMessage(Handler.java:105)
        at android.os.Looper.loop(Looper.java:171)
        at android.app.ActivityThread.main(ActivityThread.java:6684)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:246)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:783)
07-14 13:08:12.856 3992-3992/com.example.demo_69_service D/demo69_service: onBind
    java.lang.RuntimeException
        at com.example.demo_69_service.MyService.onBind(MyService.java:38)
        at android.app.ActivityThread.handleBindService(ActivityThread.java:3469)
        at android.app.ActivityThread.-wrap2(Unknown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1716)
        at android.os.Handler.dispatchMessage(Handler.java:105)
        at android.os.Looper.loop(Looper.java:171)
        at android.app.ActivityThread.main(ActivityThread.java:6684)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:246)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:783)
07-14 13:08:12.857 3992-3992/com.example.demo_69_service D/demo69_activity: onServiceConnected
    java.lang.RuntimeException
        at com.example.demo_69_service.MainActivity$1.onServiceConnected(MainActivity.java:22)
        at android.app.LoadedApk$ServiceDispatcher.doConnected(LoadedApk.java:1645)
        at android.app.LoadedApk$ServiceDispatcher$RunConnection.run(LoadedApk.java:1674)
        at android.os.Handler.handleCallback(Handler.java:789)
        at android.os.Handler.dispatchMessage(Handler.java:98)
        at android.os.Looper.loop(Looper.java:171)
        at android.app.ActivityThread.main(ActivityThread.java:6684)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:246)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:783)

小米mix只走了了onCreate和onBind方法，onStartCommand是不走的。

3.3 startService+bindService

第一次start Service

07-13 23:51:43.602 6525-6525/com.example.demo_69_service D/demo69_service: onCreate
    java.lang.RuntimeException
        at com.example.demo_69_service.MyService.onCreate(MyService.java:31)
        at android.app.ActivityThread.handleCreateService(ActivityThread.java:3442)
        at android.app.ActivityThread.-wrap4(Unknown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1711)
        at android.os.Handler.dispatchMessage(Handler.java:105)
        at android.os.Looper.loop(Looper.java:171)
        at android.app.ActivityThread.main(ActivityThread.java:6684)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:246)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:783)
07-13 23:51:43.616 6525-6525/com.example.demo_69_service D/demo69_service: onStartCommand
    java.lang.RuntimeException
        at com.example.demo_69_service.MyService.onStartCommand(MyService.java:44)
        at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3577)
        at android.app.ActivityThread.-wrap20(Unknown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1726)
        at android.os.Handler.dispatchMessage(Handler.java:105)
        at android.os.Looper.loop(Looper.java:171)
        at android.app.ActivityThread.main(ActivityThread.java:6684)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:246)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:783)

第一次启动bind Service

07-13 23:52:18.474 6525-6525/com.example.demo_69_service D/demo69_service: onBind
    java.lang.RuntimeException
        at com.example.demo_69_service.MyService.onBind(MyService.java:38)
        at android.app.ActivityThread.handleBindService(ActivityThread.java:3469)
        at android.app.ActivityThread.-wrap2(Unknown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1716)
        at android.os.Handler.dispatchMessage(Handler.java:105)
        at android.os.Looper.loop(Looper.java:171)
        at android.app.ActivityThread.main(ActivityThread.java:6684)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:246)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:783)
07-13 23:52:18.483 6525-6525/com.example.demo_69_service D/demo69_activity: onServiceConnected
    java.lang.RuntimeException
        at com.example.demo_69_service.MainActivity$1.onServiceConnected(MainActivity.java:22)
        at android.app.LoadedApk$ServiceDispatcher.doConnected(LoadedApk.java:1645)
        at android.app.LoadedApk$ServiceDispatcher$RunConnection.run(LoadedApk.java:1674)
        at android.os.Handler.handleCallback(Handler.java:789)
        at android.os.Handler.dispatchMessage(Handler.java:98)
        at android.os.Looper.loop(Looper.java:171)
        at android.app.ActivityThread.main(ActivityThread.java:6684)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:246)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:783)

第二次start Service

07-13 23:58:09.283 6525-6525/com.example.demo_69_service D/demo69_service: onStartCommand
    java.lang.RuntimeException
        at com.example.demo_69_service.MyService.onStartCommand(MyService.java:44)
        at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3577)
        at android.app.ActivityThread.-wrap20(Unknown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1726)
        at android.os.Handler.dispatchMessage(Handler.java:105)
        at android.os.Looper.loop(Looper.java:171)
        at android.app.ActivityThread.main(ActivityThread.java:6684)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:246)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:783)

第二次启动bind Service

尴尬，一个log都没有

小米 mix2是不会重复bind的。这里对应原因：

ActiveServices.java

    private final boolean requestServiceBindingLocked(ServiceRecord r, IntentBindRecord i,
            boolean execInFg, boolean rebind) throws TransactionTooLargeException {
        if (r.app == null || r.app.thread == null) {
            // If service is not currently running, can't yet bind.
            return false;
        }
        if (DEBUG_SERVICE) Slog.d(TAG_SERVICE, "requestBind " + i + ": requested=" + i.requested
                + " rebind=" + rebind);
        if ((!i.requested || rebind) && i.apps.size() > 0) {
            try {
                bumpServiceExecutingLocked(r, execInFg, "bind");
                r.app.forceProcessStateUpTo(ActivityManager.PROCESS_STATE_SERVICE);
                r.app.thread.scheduleBindService(r, i.intent.getIntent(), rebind,
                        r.app.repProcState);
                if (!rebind) {
                    i.requested = true;
                }
                i.hasBound = true;
                i.doRebind = false;
            } catch (TransactionTooLargeException e) {
                // Keep the executeNesting count accurate.
                if (DEBUG_SERVICE) Slog.v(TAG_SERVICE, "Crashed while binding " + r, e);
                final boolean inDestroying = mDestroyingServices.contains(r);
                serviceDoneExecutingLocked(r, inDestroying, inDestroying);
                throw e;
            } catch (RemoteException e) {
                if (DEBUG_SERVICE) Slog.v(TAG_SERVICE, "Crashed while binding " + r);
                // Keep the executeNesting count accurate.
                final boolean inDestroying = mDestroyingServices.contains(r);
                serviceDoneExecutingLocked(r, inDestroying, inDestroying);
                return false;
            }
        }
        return true;
    }i.requested || rebind) && i.apps.size() > 0) {
            try {
                bumpServiceExecutingLocked(r, execInFg, "bind");
                r.app.forceProcessStateUpTo(ActivityManager.PROCESS_STATE_SERVICE);
                r.app.thread.scheduleBindService(r, i.intent.getIntent(), rebind,
                        r.app.repProcState);
                if (!rebind) {
                    i.requested = true;
                }
                i.hasBound = true;
                i.doRebind = false;
            } catch (TransactionTooLargeException e) {
                // Keep the executeNesting count accurate.
                if (DEBUG_SERVICE) Slog.v(TAG_SERVICE, "Crashed while binding " + r, e);
                final boolean inDestroying = mDestroyingServices.contains(r);
                serviceDoneExecutingLocked(r, inDestroying, inDestroying);
                throw e;
            } catch (RemoteException e) {
                if (DEBUG_SERVICE) Slog.v(TAG_SERVICE, "Crashed while binding " + r);
                // Keep the executeNesting count accurate.
                final boolean inDestroying = mDestroyingServices.contains(r);
                serviceDoneExecutingLocked(r, inDestroying, inDestroying);
                return false;
            }
        }
        return true;
    }

bind过之后b.requested为true就不会再走进去了（IntentBindRecord），rebind传进来的时候就是false。

                    b.binder = service;
                    b.requested = true;
                    b.received = true;

而connect方法是否会重复调用取决于LoadedApk

                old = mActiveConnections.get(name);
                if (old != null && old.binder == service) {
                    // Huh, already have this one.  Oh well!
                    return;
                }

3.4 second activity bind

修改多启动一个activity然后bind到该Service