AppOpsManager 是在是在Android 4.4版本支持的 (api 19)。获得他实例的方法是
Context.getSystemService(Context.APP_OPS_SERVICE)
AppOpsManager类里有一函数 int checkOp(String op, int uid, String packageName)
public int checkOp(String op, int uid, String packageName) {
return checkOp(strOpToOp(op), uid, packageName);
}
public static int strOpToOp(String op) {
Integer val = sOpStrToOp.get(op);
if (val == null) {
throw new IllegalArgumentException("Unknown operation string: " + op);
}
return val;
}
功能就是快速检测某个应用是否具有某些权限,看上面的源码可知道最终调用了下面的代码
public int checkOp(int op, int uid, String packageName) {
try {
int mode = mService.checkOperation(op, uid, packageName);
if (mode == MODE_ERRORED) {
throw new SecurityException(buildSecurityExceptionMsg(op, uid, packageName));
}
return mode;
} catch (RemoteException e) {
}
return MODE_IGNORED;
}
op 的值是 0 ~ 47,其中0代表粗略定位权限,1代表精确定位权限,24代表悬浮窗权限。
private static int checkOp(Context context, int op){
final int version = Build.VERSION.SDK_INT;
if (version >= 19){
Object object = context.getSystemService("appops");
Class c = object.getClass();
try {
Class[] cArg = new Class[3];
cArg[0] = int.class;
cArg[1] = int.class;
cArg[2] = String.class;
Method lMethod = c.getDeclaredMethod("checkOp", cArg);
return (Integer) lMethod.invoke(object, op, Binder.getCallingUid(), context.getPackageName());
} catch(NoSuchMethodException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
}
return -1;
}