There is no standard location, however you can use the PackageManager to find out about packages and the ApplicationInfo class you can get from there has various information about a particular package: the path to its .apk, the path to its data directory, the path to a resource-only .apk (for forward locked apps), etc. Note that you may or may not have permission to read these directories depending on your relationship with the other app; however, all apps are able to read the resource .apk (which is also the real .apk for non-forward-locked app).

如果你只是在shell中闲逛，目前非前向锁定的应用程序位于/data/app/.apk中。shell用户可以读取特定的.apk，但不能列出目录。在未来的版本中，命名约定将略有改变，所以不要指望它保持不变，但如果您从包管理器中获得.apk的路径，那么您可以在shell中使用它。

从市场安装

安装后是否保留apk是市场的行为。谷歌播放安装后不保留apk。其他第三方市场可能有不同的行为。

从开发/调试工具(adb, eclipse, android studio)安装

当我们从调试工具安装apk时，直接调用adb install或从eclipse/android studio安装apk, apk将被传输(adb push)到一个公共的可读写目录，通常是/data/local/tmp/。之后，工具会使用pm命令进行安装，安装成功后会删除/data/local/tmp/目录下的临时apk。

我们可以从调试输出中获得这些信息，如下所示。

$ adb install bin/TestApplication.apk 
3155 KB/s (843375 bytes in 0.260s)
    pkg: /data/local/tmp/TestApplication.apk
Success

系统如何保存apk

当然，系统必须将所有apk存储在某个地方。根据apks类型的不同，系统有三个存放apks的位置:

for stock app Those are usually shipped in device by manufacture, including core app for system running and google service, you can find them under directory /system/app and /system/priv-app. user installed app Most of the apks fall into this category. These apks are usually installed from marketplace by users or by adb install without -s option. You can find them under the directory /data/app for a rooted device. app on sdcard If the apk enable its install location in sdcard with android:installLocation="auto" in its manifest, the app can be moved to sdcard from system's app manager menu. These apks are usually located in secure folder of sdcard /mnt/sdcard/asec. Anther way to force the install location to sdcard is using the command adb install -s apk-to-install.apk.

需要注意的是，预装app的文件不再是一个.apk文件。在/system/app或/system/ pve -app目录下有一个文件夹，包含最新的android版本的每个预安装应用程序的文件。

There is no standard location, however you can use the PackageManager to find out about packages and the ApplicationInfo class you can get from there has various information about a particular package: the path to its .apk, the path to its data directory, the path to a resource-only .apk (for forward locked apps), etc. Note that you may or may not have permission to read these directories depending on your relationship with the other app; however, all apps are able to read the resource .apk (which is also the real .apk for non-forward-locked app).

如果你只是在shell中闲逛，目前非前向锁定的应用程序位于/data/app/.apk中。shell用户可以读取特定的.apk，但不能列出目录。在未来的版本中，命名约定将略有改变，所以不要指望它保持不变，但如果您从包管理器中获得.apk的路径，那么您可以在shell中使用它。

预安装的应用程序在/system/app文件夹下。用户安装的应用程序在/data/app中。我猜除非你的手机有根密码，否则你无法访问。 我没有一个根电话在这里，但尝试这段代码:

public class Testing extends Activity {
    private static final String TAG = "TEST";
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        File appsDir = new File("/data/app");

        String[] files = appsDir.list();

        for (int i = 0 ; i < files.length ; i++ ) {
            Log.d(TAG, "File: "+files[i]);

        }
    }

它确实列出了apks在我的根htc魔术和在emu。

你可以用ADB拉应用。它们应该在/data/App/中。

adb pull (location on device) (where to save)

请注意，你必须根你的手机拉复制保护的应用程序。

在/data/app中，但出于复制保护，我认为你不能访问它。