Android快速获取当前Activity类名的三种方法

据说程序猿最讨厌的两件事：一是给代码写详细的注释；二是阅读别人的代码没注释。
在程序猿的世界里，大部分都是接手的别人的项目，而对于一些项目文档全面，项目代码规范，在阅读代码的时候相对轻松些，不至于当前是哪个Activity都不知道。But,理想是丰满的，现实是骨感的。规范的一点的，会写个BaseActivity，让项目中所有的Activity继承这个BaseActivity，然后再Activity中获取当前的活动名，包括包名。
那本文就说的是如何来打印当前的Activity类名。所以加上上面的继承自BaseAcitivty的方法，还有其他2种方法：

1）. 通过Android studio的控制台的adb命令来打印Activity信息
这个主要是利用的adb命令去打印当前的Activity的信息，包括栈名，栈内Activity的信息，类名，所在线程名等信息。优点是信息全面，缺点是每次切换一个界面，就得重新输入一次命令。
命令如下

adb shell dumpsys activity activities 

当然在输入这个命令的时候，首先你得找到你的adb所在的目录。
比如下面这个：

cd D:\android-sdk\platform-tools

嫌每次打印麻烦的，可以直接配置到环境变量中去，在path路径后，添加你的platform-tools的路径名。
打印信息如下：

ACTIVITY MANAGER ACTIVITIES (dumpsys activity activities)
  Main stack:
  * TaskRecord{42955d30 #2 A com.miui.home U 0}
    numActivities=1 rootWasReset=true userId=0
    affinity=com.miui.home
    intent={act=android.intent.action.MAIN cat=[android.intent.category.HOME] flg=0x10600000 cmp=com.miui.home/.launcher.Launcher}
    realActivity=com.miui.home/.launcher.Launcher
    askedCompatMode=false
    lastThumbnail=null lastDescription=null
    lastActiveTime=710219844 (inactive for 1158s)
    ignoreFromRecent=false
    * Hist #0: ActivityRecord{42707110 u0 com.miui.home/.launcher.Launcher}
        packageName=com.miui.home processName=com.miui.home
        launchedFromUid=0 userId=0
        app=ProcessRecord{42907f38 13729:com.miui.home/u0a10035}
        Intent { act=android.intent.action.MAIN cat=[android.intent.category.HOME] flg=0x10000000 cmp=com.miui.home/.launcher.Launcher }
        frontOfTask=true task=TaskRecord{42955d30 #2 A com.miui.home U 0}
        taskAffinity=com.miui.home
        realActivity=com.miui.home/.launcher.Launcher
        baseDir=/system/app/MiuiHome.apk
        dataDir=/data/user/0/com.miui.home
        stateNotNeeded=true componentSpecified=false isHomeActivity=true
        compat={240dpi} labelRes=0x7f0c0004 icon=0x7f0200cd theme=0x7f0f0000
        config={1.0 ?mcc?mnc zh_CN ldltr sw360dp w360dp h614dp 240dpi nrml long port finger -keyb/v/h dpad/v skin=/system/framework/framework-res.apk s.5 themeChanged=0 themeChangedFlags=0}
        launchFailed=false haveState=false icicle=null
        state=RESUMED stopped=false delayedResume=false finishing=false
        keysPaused=false inHistory=true visible=true sleeping=false idle=true
        fullscreen=true noDisplay=false immersive=false launchMode=2
        frozenBeforeDestroy=false thumbnailNeeded=false forceNewConfig=false
        thumbHolder: 42955d30 bm=null desc=null
        waitingVisible=true nowVisible=true lastVisibleTime=-22m27s145ms

  Running activities (most recent first):
    TaskRecord{42955d30 #2 A com.miui.home U 0}
      Run #0: ActivityRecord{42707110 u0 com.miui.home/.launcher.Launcher}

  mResumedActivity: ActivityRecord{42707110 u0 com.miui.home/.launcher.Launcher}
  mFocusedActivity: ActivityRecord{42707110 u0 com.miui.home/.launcher.Launcher}
  mLastPausedActivity: ActivityRecord{43859658 u0 com.kingroot.kinguser/.activitys.SuNotifyActivity}
  mSleepTimeout: false
  mDismissKeyguardOnNextActivity: false

  Recent tasks:
  * Recent #0: TaskRecord{42955d30 #2 A com.miui.home U 0}
    numActivities=1 rootWasReset=true userId=0
    affinity=com.miui.home
    intent={act=android.intent.action.MAIN cat=[android.intent.category.HOME] flg=0x10600000 cmp=com.miui.home/.launcher.Launcher}
    realActivity=com.miui.home/.launcher.Launcher
    askedCompatMode=false
    lastThumbnail=null lastDescription=null
    lastActiveTime=710219844 (inactive for 1158s)
    ignoreFromRecent=false
  * Recent #1: TaskRecord{46bdfd88 #97 A com.kingroot.kinguser U 0}
    affinity=com.kingroot.kinguser
    intent={flg=0x10800000 cmp=com.kingroot.kinguser/.activitys.SuNotifyActivity}
    realActivity=com.kingroot.kinguser/.activitys.SuNotifyActivity
    askedCompatMode=false
    lastThumbnail=null lastDescription=null
    lastActiveTime=710219836 (inactive for 1158s)
    ignoreFromRecent=false
  * Recent #2: TaskRecord{428d13e8 #96 A com.example.testactivityservice U 0}
    affinity=com.example.testactivityservice
    intent={act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=com.example.testactivityservice/.MainActivity}
    realActivity=com.example.testactivityservice/.MainActivity
    askedCompatMode=false
    lastThumbnail=null lastDescription=null
    lastActiveTime=710030246 (inactive for 1348s)
    ignoreFromRecent=false
  * Recent #3: TaskRecord{42a48de0 #95 A com.lancoo.platform U 0}
    numActivities=0 rootWasReset=true userId=0
    affinity=com.lancoo.platform
    intent={act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=com.lancoo.platform/.activity.SplashActivity}
    realActivity=com.lancoo.platform/.activity.SplashActivity
    askedCompatMode=false
    lastThumbnail=null lastDescription=null
    lastActiveTime=709770805 (inactive for 1607s)
    ignoreFromRecent=false
  * Recent #4: TaskRecord{42831158 #90 A com.android.settings U 0}
    affinity=com.android.settings
    intent={act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10008000 cmp=com.android.settings/.Settings$DevelopmentSettingsActivity}
    origActivity=com.android.settings/.DevelopmentSettings
    realActivity=com.android.settings/.Settings$DevelopmentSettingsActivity
    askedCompatMode=false
    lastThumbnail=null lastDescription=null
    lastActiveTime=709248629 (inactive for 2129s)
    ignoreFromRecent=false
  * Recent #5: TaskRecord{42d06290 #27 A com.example.administrator.myapplication U 0}
    numActivities=0 rootWasReset=true userId=0
    affinity=com.example.administrator.myapplication
    intent={act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=com.example.administrator.myapplication/.MainActivity}
    realActivity=com.example.administrator.myapplication/.MainActivity
    askedCompatMode=false
    lastThumbnail=null lastDescription=null
    lastActiveTime=504353483 (inactive for 207024s)
    ignoreFromRecent=false

  mCurTask: 97

是的，看到这么多信息头都是大的。你可以通过下面的命令来搜索你想要的信息：

adb shell dumpsys activity activities | findstr "应用包名" 

但是输入之后，信息还是太多，我只关心的是Activity名！！！
所以我建议下面的这个方法，优点是简单，是单独的一个app，点击开启打印activity的类名信息的服务，不想要是，点击stop service即可。缺点是信息没有上面的全面，但是这就够了。

2）通过服务的方式打印Activity类名
主要用到的是下面的方法。

 ActivityManager manager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
        RunningTaskInfo info = manager.getRunningTasks(1).get(0);
    String shortClassName = info.topActivity.getShortClassName();    //类名
        String className = info.topActivity.getClassName();              //完整类名
        String packageName = info.topActivity.getPackageName();          //包名

首先我们得建立这么一个服务，方便自动打印。代码如下：

import android.app.ActivityManager;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.os.Handler;
import android.os.IBinder;
import android.util.Log;

import java.util.List;

/**
 * Created by gongwq on 2017/6/17 0017.
 */

public class MyService extends Service {
    ActivityManager activityManager = null;
    Handler handler = new Handler();
    String activityName = null;
    String activity_last = null;
    Runnable runnable = new Runnable() {

        @Override
        public void run() {
            List<ActivityManager.RunningTaskInfo> runningTaskInfo = activityManager.getRunningTasks(1);
            activityName = (runningTaskInfo.get(0).topActivity).toString();
            if (!(activityName.equals(activity_last))) {
                Log.e("ActivityManager: ", "当前activity是---->" + activityName);
                activity_last = activityName;

            }
            handler.postDelayed(runnable, 10);
        }
    };

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        handler.postDelayed(runnable, 10);
        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public void onCreate() {
        super.onCreate();
        activityManager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
    }

    @Override
    public IBinder onBind(Intent arg0) {
        return null;
    }

    @Override
    public void onDestroy() {
        handler.removeCallbacks(runnable);
    }
}

最后服务不要忘记在AndroidManifest进行注册服务名，此外还要添加一个权限：

<uses-permission android:name="android.permission.GET_TASKS"></uses-permission>

主Activity的代码就不贴了，就两个按钮，对应于开启和关闭服务。

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