Android Jelly Bean (api 16) 的 READ_LOGS 权限
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READ_LOGS permission on Jelly Bean (api 16)
提问by android developer
Since Android Jelly Bean doesn't support the logs reading permission(according to this google io 2012 videoand this one too) , i would like to know if it's possible for rooted devices (or non-rooted devices) to be able to bypass this restriction and be able to read the logs.
由于 Android Jelly Bean 不支持日志读取权限（根据这个 google io 2012 视频和这个也是），我想知道是否有可能让有根设备（或非根设备）能够绕过这个限制并能够读取日志。
How do i do that? Do i really need to make the app a system app, or is rooting enough?
我怎么做？我真的需要使应用程序成为系统应用程序，还是足够扎根？
回答by ge0rg
You can obtain the permission on a rooted device by executing the pm grant command from your app. Probably you will have to restart the app after that for the change to take effect, though:
您可以通过从您的应用程序执行 pm grant 命令来获取对 root 设备的权限。不过，您可能必须在此之后重新启动应用程序才能使更改生效：
String pname = getPackageName();
String[] CMDLINE_GRANTPERMS = { "su", "-c", null };
if (getPackageManager().checkPermission(android.Manifest.permission.READ_LOGS, pname) != 0) {
Log.d(TAG, "we do not have the READ_LOGS permission!");
if (android.os.Build.VERSION.SDK_INT >= 16) {
Log.d(TAG, "Working around JellyBeans 'feature'...");
try {
// format the commandline parameter
CMDLINE_GRANTPERMS[2] = String.format("pm grant %s android.permission.READ_LOGS", pname);
java.lang.Process p = Runtime.getRuntime().exec(CMDLINE_GRANTPERMS);
int res = p.waitFor();
Log.d(TAG, "exec returned: " + res);
if (res != 0)
throw new Exception("failed to become root");
} catch (Exception e) {
Log.d(TAG, "exec(): " + e);
Toast.makeText(context, "Failed to obtain READ_LOGS permission", Toast.LENGTH_LONG).show();
}
}
} else
Log.d(TAG, "we have the READ_LOGS permission already!");
This code should be called from your onCreate(). Once the permission is granted, no more root powers are required.
应该从您的 onCreate() 调用此代码。授予权限后，不再需要根权限。
P.S: The p.waitFor() blocks on the Superuser app, delaying your app start and potentially cause an ANR.
PS：超级用户应用程序上的 p.waitFor() 阻塞，延迟您的应用程序启动并可能导致 ANR。
回答by inazaruk
EDIT: It turns out that adb shell pm grantonly works on emulators. Production devices do not allow shellto grant and revoke optional permissions.
编辑：事实证明，adb shell pm grant它只适用于模拟器。生产设备不允许shell授予和撤销可选权限。
You don't need to have root. The only thing you need to enable READ_LOGS to non-system applications is to have Android SDK installed.
你不需要root。为非系统应用程序启用 READ_LOGS 唯一需要的是安装 Android SDK。
Basically, you need to call:
基本上，您需要调用：
adb shell pm grant <pkg.name> android.permission.READ_LOGS
Where <pkg.name>is your application's package name. This is possible because READ_LOGS is not only a "system" permission, but also a "development" permission (this term is introduced in JB). Which actually allows users to grant this permission to any application. No root required.
<pkg.name>您的应用程序的包名称在哪里。这是可能的，因为 READ_LOGS 不仅是“系统”权限，还是“开发”权限（这个术语在 JB 中引入）。这实际上允许用户将此权限授予任何应用程序。无需root。
More information is available in this google groups threadwith comments from Dianne Hackborn.
更多信息可在此google 群组线程中获得，并附有 Dianne Hackborn 的评论。
回答by bara
I've got around this on a rooted device by calling logcat with suand reading from stdout
我通过调用 logcatsu并从 stdout 读取，在有根设备上解决了这个问题
... .getRuntime().exec("su -c logcat -d");
回答by Anton Tananaev
There is another way to access all logs without the need for root permissions. You can use remote debugging. Take a look at the open source rootless Logcat app.
还有另一种无需root权限即可访问所有日志的方法。您可以使用远程调试。看看开源的无根 Logcat 应用程序。
