Android 5.1 AppOps总结
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什么是AppOps
android App在AndroidManifest.xml中申请了很多运行时需要获取的权限,例如
<uses-permission android:name="android.permission.NFC" />
用户在使用某个新安装的App的时候,经常会有弹窗弹出是否允许App获取某个权限,当确认获取后,用户才能正常使用该功能。而AppOps是framework提供给用户,确切点说是开发人员,更多操作应用权限的一个途径。用户可以对某个App的权限根据自己的需求进行禁止或者放行等。
在我理解,android系统中涉及App应用权限的主要涉及3个部分:
1. 系统默认的应用权限;
2. AppOps Policy文件;
3. 通过调用AppOpsManager中的接口对某一权限进行设置;
开发人员可以利用Policy文件和AppOpsManager中的接口对默认的应用权限进行修改。后续文章将会按照上面三部分进行展开。
涉及的类
以AppOps名字开始的类包括
Settings上层
packages/apps/Settings/src/com/android/settings/applications/AppOpsCategory.java
packages/apps/Settings/src/com/android/settings/applications/AppOpsDetails.java
packages/apps/Settings/src/com/android/settings/applications/AppOpsState.java
packages/apps/Settings/src/com/android/settings/applications/AppOpsSummary.java
frameworks/base/cmds/appops下面有个appops的应用程序
frameworks/native/libs/binder/AppOpsManager.cpp
frameworks/native/include/binder/AppOpsManager.h
Appops核心实现类,AppOpsService是功能具体实现,AppOpsManager是Service相关的Manager,是SDK中的一部分。AppOpsPolicy大概意思是,系统出厂时预制的系统App(System-app)和用户app(User-app)的一些默认的权限。非常有用,我们可以把我们一些预制的信任apk的权限都设置为允许,而不用老是弹窗提示。
frameworks/base/services/core/java/com/android/server/AppOpsService.java
frameworks/base/services/core/java/com/android/server/AppOpsPolicy.java
frameworks/base/core/java/android/app/AppOpsManager.java
常用名词
在framework中,
将某一权限称为Op,即operation,操作的意思。在AppOpsManager类中用以OP_开头的int表示具体权限,例如OP_COARSE_LOCATION,既表示coarse gps权限;
将某一权限的所对应的动作称为mode。在AppOpsManager类中用以MODE_开头的int表示动作,例如MODE_ALLOWED,表示允许相关权限的执行,即获取了相应的权限。
权限管理是如何触发的
当我们第一次在使用App的时候,访问某些系统权限时,例如访问wifi,都会弹出一个对话框询问用户是否允许访问wifi等。下面是WifiManager.java中打开WiFi的代码,
public boolean setWifiEnabled(boolean enabled)
if (mAppOps.noteOp(AppOpsManager.OP_WIFI_CHANGE) !=
AppOpsManager.MODE_ALLOWED)
return false;
try
return mService.setWifiEnabled(enabled);
catch (RemoteException e)
return false;
在打开wifi前,首先会去调用AppOpsManager中的noteOp函数,如果返回值不是允许,即MODE_ALLOWED,直接返回false,不允许打开wifi。从MODE_ALLOWED的注释我们就能看出,系统一般都是通过checkOp、noteOp、startOp去检测权限,但是使用的地方不同。关于noteOp,见后文。
/**
* Result from @link #checkOp, @link #noteOp, @link #startOp: the given caller is
* allowed to perform the given operation.
*/
public static final int MODE_ALLOWED = 0;
系统默认应用权限
android系统中包含了strict模式和普通模式。什么是strict模式?
在AppOpsService类中有个变量,顾名思义,判断系统是否开启strict模式。
final boolean mStrictEnable;
而
mStrictEnable = AppOpsManager.isStrictEnable();
public static boolean isStrictEnable()
return SystemProperties.getBoolean("persist.sys.strict_op_enable", false);
可以看出,通过设置persist.sys.strict_op_enable为true,即开启了strict模式。那么strict模式和普通模式有什么差异?我们下面接着上一段(权限管理是如何触发的)分析。
调用–>
public int noteOp(int op)
return noteOp(op, Process.myUid(), mContext.getOpPackageName());
调用–>
/**
* Make note of an application performing an operation. Note that you must pass
* in both the uid and name of the application to be checked; this function will verify
* that these two match, and if not, return @link #MODE_IGNORED. If this call
* succeeds, the last execution time of the operation for this app will be updated to
* the current time.
*/
public int noteOp(int op, int uid, String packageName)
try
int mode = mService.noteOperation(op, uid, packageName);
if (mode == MODE_ERRORED)
throw new SecurityException(buildSecurityExceptionMsg(op, uid, packageName));
return mode;
catch (RemoteException e)
return MODE_IGNORED;
从上面的注释我们也能证实我们前面的描述,noteOp主要是在一个app执行某个operation时需要note,即检验是否能够执行该操作,拥有该权限。函数中实际的实现还是调用了AppOps的实现类AppOpsService的noteOperation方法。
调用–>
@Override
public int noteOperation(int code, int uid, String packageName)
//我们这里只看getOpLocked函数,其他省略
Op op = getOpLocked(ops, code, true);
if (isOpRestricted(uid, code, packageName))
return AppOpsManager.MODE_IGNORED;
调用–>
private Op getOpLocked(Ops ops, int code, boolean edit)
int mode;
//如果该app是第一次使用,肯定返回空
Op op = ops.get(code);
if (op == null)
if (!edit)
return null;
mode = getDefaultMode(code, ops.uid, ops.packageName);
op = new Op(ops.uid, ops.packageName, code, mode);
ops.put(code, op);
if (edit)
scheduleWriteLocked();
return op;
调用–>
private int getDefaultMode(int code, int uid, String packageName)
int mode = AppOpsManager.opToDefaultMode(code,
isStrict(code, uid, packageName));
//首先检查某个op是否在strict模式下,mPolicy就是上面提到的policy文件
//如果op在strict模式下,同时mPolicy存在,则从mPolicy中取默认权限
if (AppOpsManager.isStrictOp(code) && mPolicy != null)
int policyMode = mPolicy.getDefualtMode(code, packageName);
if (policyMode != AppOpsManager.MODE_ERRORED)
mode = policyMode;
return mode;
public static int opToDefaultMode(int op, boolean isStrict)
//是strict模式,返回sOpDefaultStrictMode数组
if (isStrict)
return sOpDefaultStrictMode[op];
//普通模式,返回sOpDefaultMode数组
return sOpDefaultMode[op];
//mStrictEnable是enable的,同时是app,则返回true
private boolean isStrict(int code, int uid, String packageName)
if (!mStrictEnable)
return false;
return UserHandle.isApp(uid);
从上面的分析,我们可以看出在strict模式下,op的对应默认mode在sOpDefaultStrictMode数组中查找,而普通模式下mode在sOpDefaultMode找。例如对于OP_COARSE_LOCATION,在strict模式下默认是询问AppOpsManager.MODE_ASK,而在普通模式下默认是AppOpsManager.MODE_ALLOWED。
AppOps Policy 文件
由上文可知,在获取某个op的默认权限时,如果在strict模式下,同时mPolicy不为null的时候,会去从mPolicy中读取权限。下面分析AppOps Policy 文件,
在AppOpsService中,有个默认的policy文件/system/etc/appops_policy.xml,
static final String DEFAULT_POLICY_FILE = "/system/etc/appops_policy.xml";
同时,在AppOpsService中有个AppOpsPolicy的instance,
AppOpsPolicy mPolicy;
private void readPolicy()
if (mStrictEnable)
mPolicy = new AppOpsPolicy(new File(DEFAULT_POLICY_FILE), mContext);
mPolicy.readPolicy();
mPolicy.debugPoilcy();
else
mPolicy = null;
在strict模式下,实例化了一个AppOpsPolicy类,一个参数为默认的policy文件
public AppOpsPolicy(File file, Context context)
super();
mFile = file;
mContext = context;
调用–>
void readPolicy()
FileInputStream stream;
synchronized (mFile)
try
stream = new FileInputStream(mFile);
catch (FileNotFoundException e)
Slog.i(TAG, "App ops policy file (" + mFile.getPath()
+ ") not found; Skipping.");
return;
String tagName = parser.getName();
if (tagName.equals("user-app")
|| tagName.equals("system-app"))
readDefaultPolicy(parser, tagName);
else if (tagName.equals("application"))
readApplicationPolicy(parser);
else
Slog.w(TAG, "Unknown element under <appops-policy>: "
+ parser.getName());
XmlUtils.skipCurrentTag(parser);
上面的函数就是读Policy文件的函数,,其实主要包括2个函数readDefaultPolicy(parser, tagName)和readApplicationPolicy(parser),我们也可以从函数中推测出policy文件的格式,起码包含user-app、system-app、application三个tag,user-app和system-app这两个tag对应的函数是readDefaultPolicy(parser, tagName),application tag对应的是readApplicationPolicy(parser),即
<appops-policy version="1">
<user-app permission="ask" show="true"/>
<system-app permission="allowed" show="false"/>
<application>
<!-- Example:
<pkg name="com.android.dialer" type="system-app">
<op name="android:call_phone" permission="ask" show="true"/>
</pkg>
-->
<pkg name="com.android.calendar" type="system-app">
<op name="android:read_contacts" permission="ask" show="true"/>
</pkg>
<pkg name="com.android.email" type="system-app">
<op name="android:read_contacts" permission="ask" show="true"/>
</pkg>
</application>
</appops-policy>
其中permission可以有allowed,ignored,ask和其他值,如下代码
/** @hide */
public static int stringToMode(String permission)
if ("allowed".equalsIgnoreCase(permission))
return AppOpsManager.MODE_ALLOWED;
else if ("ignored".equalsIgnoreCase(permission))
return AppOpsManager.MODE_IGNORED;
else if ("ask".equalsIgnoreCase(permission))
return AppOpsManager.MODE_ASK;
return AppOpsManager.MODE_ERRORED;
分别对应AppOpsManager.MODE_ALLOWED,AppOpsManager.MODE_IGNORED,AppOpsManager.MODE_ASK,其他字符串都会返回AppOpsManager.MODE_ERRORED。
而show表示是否将该权限show给用户,让用户去修改权限,如下所示,true和false分别对应CONTROL_SHOW,CONTROL_NOSHOW,如果为其他值,则对应CONTROL_UNKNOWN。
public static int stringToControl(String show)
if ("true".equalsIgnoreCase(show))
return CONTROL_SHOW;
else if ("false".equalsIgnoreCase(show))
return CONTROL_NOSHOW;
return CONTROL_UNKNOWN;
下面我们分析下推测出的AppOps Policy文件,首先在application标签外,有两个user-app,system-app的标签,分别的意思是:默认user-app(/data/app)的权限是,permission=”ask”,ask即AppOpsManager.MODE_ASK,意思是会有弹出框提示用户去点击是否允许该权限。show=”true”,允许用户去修改该权限,默认user-app的权限是true,允许修改(可以参考设置—安全—应用操作,点开某个app后,即可以修改权限是允许、提示、还是禁止)。同理,system-app(/system/app),permission=”allowed”,默认权限是允许,show=”false”,不允许用户操作。
以上两个是系统和用户app的默认权限,在application标签内,用户可以自定义添加自己app规则(如果没有自定义app规则,默认就是执行上面两个默认规则,如果有当前app自定义规则,则执行该规则,好理解吧),以搜狗输入法为例:
<pkg name="com.sohu.inputmethod.sogou" type="user-app" permission="allowed" show="true">
</pkg>
pkg标签包围, name=”com.sohu.inputmethod.sogou”,name是app的包名,type为user-app或者system-app,permission=”allowed”,所有申请的权限默认允许,show=”true”,同时指出用户去修改,show就是展示出来的意思。
通过添加上面的规则,你会发现,搜狗输入法再也不弹出位置这些权限的窗口让你来选择了。
在 AppOpsPolicy中有个成员,用来保存Policy文件所描述的这些规则,HashMap保存的格式为(packageName,PolicyPkg),每个App是其中的一项。
HashMap<String, PolicyPkg> mPolicy = new HashMap<String, PolicyPkg>();
其中PolicyPkg为AppOpsPolicy中的内部类,
//该内部类就是用来保存上面的 <op name="android:read_contacts" permission="ask" show="true"/>
public final static class PolicyOp
public int op;
public int mode;
public int show;
public PolicyOp(int op, int mode, int show)
this.op = op;
this.mode = mode;
this.show = show;
@Override
public String toString()
return "PolicyOp [op=" + op + ", mode=" + mode + ", show=" + show
+ "]";
public final static class PolicyPkg extends SparseArray<PolicyOp>
public String packageName;
public int mode;
public int show;
public String type;
public PolicyPkg(String packageName, int mode, int show, String type)
this.packageName = packageName;
this.mode = mode;
this.show = show;
this.type = type;
@Override
public String toString()
return "PolicyPkg [packageName=" + packageName + ", mode=" + mode
+ ", show=" + show + ", type=" + type + "]";
下面先介绍读取user-app和system-app这两个tag的函数,读取完成后,在mPolicy 中保存的格式为(“user-app”,PolicyPkg )或者(“system-app”,PolicyPkg ),
private void readDefaultPolicy(XmlPullParser parser, String packageName)
throws NumberFormatException, XmlPullParserException, IOException
//必须是user-app或者system-app
if (!"user-app".equalsIgnoreCase(packageName)
&& !"system-app".equalsIgnoreCase(packageName))
return;
int mode = AppOpsManager.stringToMode(parser.getAttributeValue(null,
"permission"));
int show = stringToControl(parser.getAttributeValue(null, "show"));
if (mode == AppOpsManager.MODE_ERRORED && show == CONTROL_UNKNOWN)
return;
/*如果mPolicy没default policy,则新建一个PolicyPkg,一个hash键值对,这个键值对的格式是("user-app",PolicyPkg )或者("system-app",PolicyPkg ),如果已经存在,则修改mode和show*/
PolicyPkg pkg = this.mPolicy.get(packageName);
if (pkg == null)
pkg = new PolicyPkg(packageName, mode, show, packageName);
this.mPolicy.put(packageName, pkg);
else
Slog.w(TAG, "Duplicate policy found for package: " + packageName
+ " of type: " + packageName);
pkg.mode = mode;
pkg.show = show;
接着是读取application tag下的元素,
private void readApplicationPolicy(XmlPullParser parser)
throws NumberFormatException, XmlPullParserException, IOException
......
/*读取下面的pkg tag*/
String tagName = parser.getName();
if (tagName.equals("pkg"))
readPkgPolicy(parser);
else
Slog.w(TAG,
"Unknown element under <application>: "
+ parser.getName());
XmlUtils.skipCurrentTag(parser);
调用–>
读取pkg本身的元素,如果pkg tag下还有op tag,继续读op tag。
private void readPkgPolicy(XmlPullParser parser)
throws NumberFormatException, XmlPullParserException, IOException
String packageName = parser.getAttributeValue(null, "name");
if (packageName == null)
return;
String appType = parser.getAttributeValue(null, "type");
if (appType == null)
return;
int mode = AppOpsManager.stringToMode(parser.getAttributeValue(null,
"permission"));
int show = stringToControl(parser.getAttributeValue(null, "show"));
String key = packageName + "." + appType;
PolicyPkg pkg = this.mPolicy.get(key);
/*可以看到这里的键值对的键是以packageName + "." + appType形式,例如sogou输入法的键就为com.sohu.inputmethod.sogou.user-app,和default policy相同,如果mPolicy中没有该元素,则新建,否则修改mode和show。*/
if (pkg == null)
pkg = new PolicyPkg(packageName, mode, show, appType);
this.mPolicy.put(key, pkg);
else
Slog.w(TAG, "Duplicate policy found for package: " + packageName
+ " of type: " + appType);
pkg.mode = mode;
pkg.show = show;
int outerDepth = parser.getDepth();
int type;
while ((type = parser.next()) != XmlPullParser.END_DOCUMENT
&& (type != XmlPullParser.END_TAG || parser.getDepth() > outerDepth))
if (type == XmlPullParser.END_TAG || type == XmlPullParser.TEXT)
continue;
String tagName = parser.getName();
if (tagName.equals("op"))
readOpPolicy(parser, pkg);
else
Slog.w(TAG, "Unknown element under <pkg>: " + parser.getName());
XmlUtils.skipCurrentTag(parser);
从上可以看出pkg下面的键值对形式为(“com.sohu.inputmethod.sogou.user-app”,PolicyPkg),下面接着读pkg下面的op tag。
调用–>
由于PolicyPkg extends SparseArray,所以PolicyPkg 内部有个保存pkg下相关op的一个SparseArray,保存的格式为(code,PolicyOp),code是个int,是稀疏数组的键吧。
private void readOpPolicy(XmlPullParser parser, PolicyPkg pkg)
throws NumberFormatException, XmlPullParserException, IOException
if (pkg == null)
return;
String opName = parser.getAttributeValue(null, "name");
if (opName == null)
Slog.w(TAG, "Op name is null");
return;
int code = AppOpsManager.stringOpToOp(opName);
if (code == AppOpsManager.OP_NONE)
Slog.w(TAG, "Unknown Op: " + opName);
return;
int mode = AppOpsManager.stringToMode(parser.getAttributeValue(null,
"permission"));
int show = stringToControl(parser.getAttributeValue(null, "show"));
if (mode == AppOpsManager.MODE_ERRORED && show == CONTROL_UNKNOWN)
return;
PolicyOp op = pkg.get(code);
if (op == null)
op = new PolicyOp(code, mode, show);
pkg.put(code, op);
else
Slog.w(TAG, "Duplicate policy found for package: "
+ pkg.packageName + " type: " + pkg.type + " op: " + op.op);
op.mode = mode;
op.show = show;
至此,AppOps Policy文件已经读完。
AppOpsService准备工作
在AppOpsService类中,首先有个稀疏数组的成员mUidOps,顾名思义,涉及到Uid和Ops相关的东西。在android中,uid被赋予linux不同的任务,不同的App享有不同的Uid。作为稀疏数组的键,而对应的值为HashMap
final SparseArray<HashMap<String, Ops>> mUidOps
= new SparseArray<HashMap<String, Ops>>();
Op是一个内部类,保存了一个op(权限)的详细信息,例如从什么时候开始运行的,等等。
public final static class Op
public final int uid;
public final String packageName;
public final int op;
public int mode;
public int duration;
public long time;
public long rejectTime;
public int nesting;
public int noteOpCount;
public int startOpCount;
public PermissionDialogReqQueue dialogReqQueue;
final ArrayList<IBinder> clientTokens;
public Op(int _uid, String _packageName, int _op, int _mode)
uid = _uid;
packageName = _packageName;
op = _op;
mode = _mode;
dialogReqQueue = new PermissionDialogReqQueue();
clientTokens = new ArrayList<IBinder>();
而Ops也是一个内部类,包含了一个SparseArray,op的稀疏数组。Ops既是Op的复数,很多个Op的意思。
public final static class Ops extends SparseArray<Op>
public final String packageName;
public final int uid;
public final boolean isPrivileged;
public Ops(String _packageName, int _uid, boolean _isPrivileged)
packageName = _packageName;
uid = _uid;
isPrivileged = _isPrivileged;
所以,mUidOps保存的数据类似(uid,HashMap
详细分析权限管理的触发
前面讲过,在打开wifi时会调用AppOpsManager中的noteOp函数,进行权限的检测,下面详细分析,
public int noteOp(int op, int uid, String packageName)
try
int mode = mService.noteOperation(op, uid, packageName);
if (mode == MODE_ERRORED)
throw new SecurityException(buildSecurityExceptionMsg(op, uid, packageName));
return mode;
catch (RemoteException e)
return MODE_IGNORED;
调用–>
调用AppOpsService中的noteOperation,
public int noteOperation(int code, int uid, String packageName)
final PermissionDialogReq req;
verifyIncomingUid(uid);
verifyIncomingOp(code);
synchronized (this)
//如果mUidOps中没有该App信息,则建立,否则返回Ops
Ops ops = getOpsLocked(uid, packageName, true);
if (ops == null)
if (DEBUG) Log.d(TAG, "noteOperation: no op for code " + code + " uid " + uid
+ " package " + packageName);
return AppOpsManager.MODE_ERRORED;
//查找或者建立一个Op,放到ops中
//此外在getOpLocked,参数edit为true的情况下回去写/data/system/appops.xml文件,如果这个
//op是新建立的,则会马上更新appops.xml文件
Op op = getOpLocked(ops, code, true);
//至此,如果该app的这个权限是第一次在函数中处理,这时候已经在mUidOps和appops.xml中存在了
if (isOpRestricted(uid, code, packageName))
return AppOpsManager.MODE_IGNORED;
if (op.duration == -1)
Slog.w(TAG, "Noting op not finished: uid " + uid + " pkg " + packageName
+ " code " + code + " time=" + op.time + " duration=" + op.duration);
op.duration = 0;
/*将code转换为switchcode*/
final int switchCode = AppOpsManager.opToSwitch(code);
/*如果op和switchop不同*/
final Op switchOp = switchCode != code ? getOpLocked(ops,
switchCode, true) : op;
/*如果mode不是allow和ask,则是被拒绝了,将reject的时间保存*/
if (switchOp.mode != AppOpsManager.MODE_ALLOWED
&& switchOp.mode != AppOpsManager.MODE_ASK)
if (DEBUG)
Log.d(TAG, "noteOperation: reject #" + op.mode
+ " for code " + switchCode + " (" + code
+ ") uid " + uid + " package " + packageName);
op.rejectTime = System.currentTimeMillis();
return switchOp.mode;
else if (switchOp.mode == AppOpsManager.MODE_ALLOWED)
if (DEBUG)
Log.d(TAG, "noteOperation: allowing code " + code + " uid "
+ uid + " package " + packageName);
/*如果mode是allow,记录note的时间,并将reject设置为0*/
op.time = System.currentTimeMillis();
op.rejectTime = 0;
return AppOpsManager.MODE_ALLOWED;
else
if (Looper.myLooper() == mLooper)
Log.e(TAG,
"noteOperation: This method will deadlock if called from the main thread. (Code: "
+ code
+ " uid: "
+ uid
+ " package: "
+ packageName + ")");
return switchOp.mode;
/*mode是ask,就是跳出来弹窗提醒,这里将op.noteOpCount增加*/
op.noteOpCount++;
req = askOperationLocked(code, uid, packageName, switchOp);
return req.get();
先看getOpsLocked函数
private Ops getOpsLocked(int uid, String packageName, boolean edit)
/*uid为0,包名为root,uid为shell,包名为com.android.shell,uid为system,同时包名为空,则包名为android*/
if (uid == 0)
packageName = "root";
else if (uid == Process.SHELL_UID)
packageName = "com.android.shell";
else if (uid == Process.SYSTEM_UID)
if (packageName == null)
packageName = "android";
return getOpsRawLocked(uid, packageName, edit);
接着调用,
/*有个参数edit,应该表示是不是可以修改mUidOps;
返回一个Ops,如果mUidOps中还没有该app相关信息,则新建一个HashMap<String, Ops>,放到mUidOps
*/
private Ops getOpsRawLocked(int uid, String packageName, boolean edit)
HashMap<String, Ops> pkgOps = mUidOps.get(uid);
/*mUidOps里面没有这个uid的app*/
if (pkgOps == null)
/*如果edit为false,不允许修改mUidOps,直接就返回了*/
if (!edit)
return null;
/*如果没有这个uid的app,则新建一个,这时pkgOps还是空的*/
pkgOps = new HashMap<String, Ops>();
mUidOps.put(uid, pkgOps);
Ops ops = pkgOps.get(packageName);
if (ops == null)
if (!edit)
return null;
boolean isPrivileged = false;
// This is the first time we have seen this package name under this uid,
// so let's make sure it is valid.
//由上面的注释,主要是为了检验合法性
if (uid != 0)
final long ident = Binder.clearCallingIdentity();
try
int pkgUid = -1;
try
ApplicationInfo appInfo = ActivityThread.getPackageManager()
.getApplicationInfo(packageName, 0, UserHandle.getUserId(uid));
if (appInfo != null)
pkgUid = appInfo.uid;
isPrivileged = (appInfo.flags & ApplicationInfo.FLAG_PRIVILEGED) != 0;
else
if ("media".equals(packageName))
pkgUid = Process.MEDIA_UID;
isPrivileged = false;
catch (RemoteException e)
Slog.w(TAG, "Could not contact PackageManager", e);
if (pkgUid != uid)
// Oops! The package name is not valid for the uid they are calling
// under. Abort.
Slog.w(TAG, "Bad call: specified package " + packageName
+ " under uid " + uid + " but it is really " + pkgUid);
return null;
finally
Binder.restoreCallingIdentity(ident);
//这里新建一个Ops,然后放到pkgOps中
ops = new Ops(packageName, uid, isPrivileged);
pkgOps.put(packageName, ops);
return ops;
通过上面两步,如果mUidOps中还没有该app相关信息,则新建一个HashMap
private Op getOpLocked(Ops ops, int code, boolean edit)
int mode;
Op op = ops.get(code);
//如果这个App是第一次进入这个函数,那么op肯定是空的
if (op == null)
if (!edit)
return null;
//获取默认的Mode,然后put到ops中
mode = getDefaultMode(code, ops.uid, ops.packageName);
op = new Op(ops.uid, ops.packageName, code, mode);
ops.put(code, op);
//如果允许edit,则执行scheduleWriteLocked
if (edit)
scheduleWriteLocked();
return op;
调用–>getDefaultMode
获取默认Mode前面已经讲过,这里如果这个op是strict的,同时mPolicy不为空,即Policy文件存在,则调用 mPolicy.getDefualtMode(code, packageName);
private int getDefaultMode(int code, int uid, String packageName)
int mode = AppOpsManager.opToDefaultMode(code,
isStrict(code, uid, packageName));
if (AppOpsManager.isStrictOp(code) && mPolicy != null)
int policyMode = mPolicy.getDefualtMode(code, packageName);
//如果返回值是MODE_ERRORED,那么会返回上面的opToDefaultMode的Mode
//感觉这种情况唯有mPolicy文件存在,但是没啥东西的时候,getDefualtMode返回MODE_ERRORED
if (policyMode != AppOpsManager.MODE_ERRORED)
mode = policyMode;
return mode;
注释很明确,就是先从默认规则读相关的Mode,如果还有pkg,那么继续读pkg下面的能匹配的mode,如果有匹配的则会覆盖前面mode的值。mode的默认值是AppOpsManager.MODE_ERRORED。
public int getDefualtMode(int code, String packageName)
int mode = AppOpsManager.MODE_ERRORED;
PolicyPkg pkg;
String key;
String type;
if (mPolicy == null)
return mode;
if (DEBUG)
Slog.d(TAG, "Default mode requested for op=" + code + " package="
+ packageName);
type = getAppType(packageName);
if (type != null)
// Get value based on 'type'
key = type;
pkg = mPolicy.get(key);
if (pkg != null && pkg.mode != AppOpsManager.MODE_ERRORED)
if (DEBUG)
Slog.d(TAG, "Setting value based on type: " + pkg);
mode = pkg.mode;
// Get value based on 'pkg'.
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