Android 如何获取已安装包的 lib 文件夹的路径
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How to get the path to the lib folder for an installed package
提问by Zardos
Shared libraries .so files are placed in lib/armeabi in an apk file.
共享库 .so 文件放置在 apk 文件中的 lib/armeabi 中。
I have read after installation the libs gets extracted to /data/data/application_package/lib
我在安装后阅读了 libs 被提取到 /data/data/application_package/lib
How can I get the exact path to this directory in my application at run time? Is this directory readable by the application? Or is only executeable access allowed? If it is readable - Is this still true for copy protected applications?
如何在运行时获取应用程序中此目录的确切路径？应用程序是否可以读取该目录？还是只允许可执行访问？如果它是可读的 - 这对于受复制保护的应用程序是否仍然正确？
采纳答案by Ralph L?we
You can get the exact path with:
您可以通过以下方式获取确切路径：
String libraryPath = getContext().getApplicationInfo().dataDir + "/lib";
The directory and its files are readable by the application.
该目录及其文件可由应用程序读取。
The unix permissions are set to rwxr-x--x. So applications with
the same group can read the files.
unix 权限设置为rwxr-x--x. 因此具有相同组的应用程序可以读取文件。
回答by Crossle Song
Added in API level 9
在 API 级别 9 中添加
getContext().getApplicationInfo().nativeLibraryDir;
getContext().getApplicationInfo().nativeLibraryDir;
回答by jhasse
And if you're using a native activity and C++:
如果您使用本机活动和 C++：
void ANativeActivity_onCreate(ANativeActivity* app, void*, size_t) {
const jclass contextClass = app->env->GetObjectClass(app->clazz);
const jmethodID getApplicationContextMethod =
app->env->GetMethodID(contextClass, "getApplicationContext", "()Landroid/content/Context;");
const jobject contextObject =
app->env->CallObjectMethod(app->clazz, getApplicationContextMethod);
const jmethodID getApplicationInfoMethod = app->env->GetMethodID(
contextClass, "getApplicationInfo", "()Landroid/content/pm/ApplicationInfo;");
const jobject applicationInfoObject =
app->env->CallObjectMethod(contextObject, getApplicationInfoMethod);
const jfieldID nativeLibraryDirField = app->env->GetFieldID(
app->env->GetObjectClass(applicationInfoObject), "nativeLibraryDir", "Ljava/lang/String;");
const jobject nativeLibraryDirObject =
app->env->GetObjectField(applicationInfoObject, nativeLibraryDirField);
const jmethodID getBytesMethod = app->env->GetMethodID(
app->env->GetObjectClass(nativeLibraryDirObject), "getBytes", "(Ljava/lang/String;)[B");
const auto bytesObject = static_cast<jbyteArray>(app->env->CallObjectMethod(
nativeLibraryDirObject, getBytesMethod, app->env->NewStringUTF("UTF-8")));
const size_t length = app->env->GetArrayLength(bytesObject);
const jbyte* const bytes = app->env->GetByteArrayElements(bytesObject, nullptr);
const std::string libDir(reinterpret_cast<const char*>(bytes), length);
回答by PYK
String libpath = getApplicationInfo().nativeLibraryDir;
Class used: import android.content.pm.ApplicationInfo;
使用的类：import android.content.pm.ApplicationInfo;
回答by Verdigrass
String libraryPath = context.getFilesDir().getParentFile().getPath() + "/lib";
For better compatibility, use the following function:
为了更好的兼容性，请使用以下函数：
@TargetApi(Build.VERSION_CODES.GINGERBREAD)
public static String getLibraryDirectory(Context context) {
int sdk_level = android.os.Build.VERSION.SDK_INT;
if (sdk_level >= Build.VERSION_CODES.GINGERBREAD) {
return context.getApplicationInfo().nativeLibraryDir;
}
else if (sdk_level >= Build.VERSION_CODES.DONUT) {
return context.getApplicationInfo().dataDir + "/lib";
}
return "/data/data/" + context.getPackageName() + "/lib";
}
回答by Ken
Maybe a device support different CPU_ABIs, so it's better to get nativeRootLibraryDir which contain all sub lib directories:
也许一个设备支持不同的 CPU_ABI，所以最好获取包含所有子库目录的 nativeRootLibraryDir：
public static String getNativeLibraryDirectory(Context context) {
int sdk_level = android.os.Build.VERSION.SDK_INT;
if (sdk_level >= Build.VERSION_CODES.GINGERBREAD) {
try {
String secondary = (String) ApplicationInfo.class.getField("nativeLibraryRootDir").get(context.getApplicationInfo());
return secondary;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
else if (sdk_level >= Build.VERSION_CODES.DONUT) {
return context.getApplicationInfo().dataDir + "/lib";
}
return "/data/data/" + context.getPackageName() + "/lib";
}
