Android后台抓取系统日记

要抓取系统日记，只需运行adb logcat即可，但需要在终端上运行命令才行。安装第
三方应用需要adb shell pm grant 包名 android.permission.READ_LOGS才能读到系统
日记，这是由于android.permission.READ_LOGS不能直接申请导致。现在的手机平台都
是在拨号界面输入一串字符,即可调用app抓取日记(如mtk平台输入*#*#3646633#*#*，可
调用mtklogger),于是自己写了一个demo(Android7.0 mtk)。

输入字符串启动应用原理

packages/services/Telephony/src/com/android/phone/SpecialCharSequenceMgr.java

static private boolean handleSecretCode(Context context, String input) {
        // Secret codes are in the form *#*#<code>#*#*
        int len = input.length();
        if (len > 8 && input.startsWith("*#*#") && input.endsWith("#*#*")) {
            Intent intent = new Intent(TelephonyIntents.SECRET_CODE_ACTION,
                    Uri.parse("android_secret_code://" + input.substring(4, len - 4)));
            context.sendBroadcast(intent);
            return true;
        }

        return false;
    }

这里发出了广播，我们只需监听该广播即可。

public class BroastcastReceiverService extends Service {
    private BroadcastReceiver receiver;
    private String SECRET_CODE_ACTION = "android.provider.Telephony.SECRET_CODE";
    private String TAG = "logcat";
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }


    @Override
    public void onCreate() {
        super.onCreate();
        Log.e(TAG,"BroastcastReceiverService start");
        receiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            Log.e(TAG,"onReceive");
            if (intent.getAction().equals(SECRET_CODE_ACTION)){
                Uri uri = intent.getData();
                String host=uri.getHost();
                String scheme=uri.getScheme();
                Log.e(TAG,host);
                Log.e(TAG,scheme);
                if(host.equals("888"))
                {
                    Log.e(TAG,"start logcatread app");
                    Intent intentobj = new Intent(BroastcastReceiverService.this,MainActivity.class);
                    startActivity(intentobj);
                }
            }
        }
    };
     IntentFilter filter = new IntentFilter(SECRET_CODE_ACTION);
     filter.addDataScheme("android_secret_code");
     registerReceiver(receiver, filter);
    }

    @Override
    public void onDestroy() {
    }
}

AndroidManifest.xml加上

<service android:name="BroastcastReceiverService" android:exported="true" android:enabled="true"/>

启动该服务

frameworks/base/services/java/com/android/server/SystemServer.java

startSystemUi方法中加上

 Intent intent1 = new Intent();
 intent.setComponent(new ComponentName("www.com.logcatreader", "www.com.logcatreader.BroastcastReceiverService"));
 context.startServiceAsUser(intent, UserHandle.SYSTEM);

这里会报错ActivityManager: Unable to start service Intent { cmp=www.com.logcatreader/.BroastcastReceiverService } U=0: not found
查到是这里出错

frameworks/base/core/java/android/content/pm/PackageUserState.java

public boolean isMatch(ComponentInfo componentInfo, int flags) {
        if (!isInstalled(flags)) return false;
        if (!isEnabled(componentInfo, flags)) return false;
        if ((flags & MATCH_SYSTEM_ONLY) != 0) {
            if (!componentInfo.applicationInfo.isSystemApp()) {
                return false;
            }
        }

        final boolean matchesUnaware = ((flags & MATCH_DIRECT_BOOT_UNAWARE) != 0)
                && !componentInfo.directBootAware;
        final boolean matchesAware = ((flags & MATCH_DIRECT_BOOT_AWARE) != 0)
                && componentInfo.directBootAware;
        Log.v(TAG,matchesUnaware+""+matchesAware);
        Log.v(TAG,flags+"");
        return matchesUnaware || matchesAware;
    }

AndroidManifest.xml加上

android:directBootAware="true"

系统休眠后，该服务就被杀掉到了，在AndroidManifest.xml加上

android:persistent="true"

抓取logcat代码

 @Override
    public void run() {
        try {
            File folder = new File("/mnt/sdcard/Android/syslog");
            if(!folder.exists())
            {
               boolean ret=folder.mkdirs();
               if(!ret) {
                   Log.e(TAG, "create folder failed");
                   return;
               }
            }
            SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyyMMdd_HHmmss");// HH:mm:ss
            Date date = new Date(System.currentTimeMillis());
            String tg = simpleDateFormat.format(date);
            Log.e(TAG, tg);
            file = new File(folder, tg + ".txt");
            String line;
            if (!file.exists()) {
                try {
                    file.createNewFile();
                } catch (IOException e) {
                    return;
                }
            }
            Process process = Runtime.getRuntime().exec("logcat");
            out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file, true)));
            Log.e(TAG, "Process : " + process);
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(process.getInputStream()));
            while ((line = bufferedReader.readLine()) != null) {
                out.write(line);
                out.write("\r\n");
                if(!isObserverLog){
                    out.close();
                    Log.e(TAG, "close" );
                    break;
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        };
        Log.e(TAG, "thread exit" );
    }

再把应用的图标隐藏掉，在AndroidManifest.xml注释

将该应用编译进系统

在AndroidManifest.xml加上

android:sharedUserId="android.uid.system"

这里用android-studio写代码，调试完后，选择Build->Bulid-APK(s),app/build/outputs/apk/debug/app-debug.apk
即我们需要的apk，并将该app改名为logcatreader.apk
编写Android.mk

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := logcatreader
LOCAL_MODULE_CLASS := APPS
LOCAL_MODULE_TAGS := optional
LOCAL_BUILT_MODULE_STEM := package.apk
LOCAL_MODULE_SUFFIX := $(COMMON_ANDROID_PACKAGE_SUFFIX)
LOCAL_CERTIFICATE := platform
LOCAL_PRIVILEGED_MODULE := true
LOCAL_SRC_FILES := $(LOCAL_MODULE).apk
include $(BUILD_PREBUILT)

mmm进行编译(如果要编译到系统，加入PRODUCT_PACKAGES+=logcatreader),并push到系统。
源码地址 https://github.com/wew888/logcatreader.git

Android后台抓取系统日记

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