Android实践 -- App的静默安装和卸载

App的静默安装和卸载

Android系统本身提供了安装卸载功能，但是api接口是@hide的，不是公开的接口，所以在应用级别
是无法实现静默安装和卸载的，要实现静默安装和卸载需要是系统应用，要有系统签名和相应的权限

简单思路如下：
1. 通过反射获得安装接口installPackage和 卸载接口 deletePackage
2. 在自己的包中引入两个接口IPackageInstallObserver和IPackageDeleteObserver的空实现
3. 调用安装卸载的方法，回调上面的两个接口
4. 添加权限

5. 进行系统签名
6. 将应用push到系统中，作为系统应用

在PackageManager中的提供的接口如下

1. 安装接口

   // @SystemApi
   public abstract void installPackage(
       Uri packageURI, IPackageInstallObserver observer, int flags,
       String installerPackageName);

2. 卸载接口

   // @SystemApi
   public abstract void deletePackage(
       String packageName, IPackageDeleteObserver observer, int flags);

引入两个回掉的空实现

在自己应用的工程中新建一个包android.content.pm,并添加两个文件
* IPackageDeleteObserver.java

    package android.content.pm;
    public interface IPackageDeleteObserver extends android.os.IInterface {
    public abstract static class Stub extends android.os.Binder implements android.content.pm.IPackageDeleteObserver {
        public Stub() {
            throw new RuntimeException("Stub!");
        }

        public static android.content.pm.IPackageDeleteObserver asInterface(android.os.IBinder obj) {
            throw new RuntimeException("Stub!");
        }

        public android.os.IBinder asBinder() {
            throw new RuntimeException("Stub!");
        }

        public boolean onTransact(int code, android.os.Parcel data, android.os.Parcel reply, int flags)
                throws android.os.RemoteException {
            throw new RuntimeException("Stub!");
        }
    }

    public abstract void packageDeleted(java.lang.String packageName, int returnCode)
            throws android.os.RemoteException;
  }

• IPackageInstallObserver.java

  package android.content.pm;
  public interface IPackageInstallObserver extends android.os.IInterface {
  
  public abstract static class Stub extends android.os.Binder implements android.content.pm.IPackageInstallObserver {
      public Stub() {
          throw new RuntimeException("Stub!");
      }
  
      public static android.content.pm.IPackageInstallObserver asInterface(android.os.IBinder obj) {
          throw new RuntimeException("Stub!");
      }
  
      public android.os.IBinder asBinder() {
          throw new RuntimeException("Stub!");
      }
  
      public boolean onTransact(int code, android.os.Parcel data, android.os.Parcel reply, int flags)
              throws android.os.RemoteException {
          throw new RuntimeException("Stub!");
      }
  }
  
  public abstract void packageInstalled(java.lang.String packageName, int returnCode)
          throws android.os.RemoteException;
  }

自己定义个接口回调

• OnPackagedObserver.java

  package com.example;
  public interface OnPackagedObserver {
  
  public void packageInstalled(String packageName, int returnCode);
  public void packageDeleted(String packageName,int returnCode);
  }

实现方法

• 反射接口

  PackageManager pm = context.getPackageManager();
  
  Class[] types = new Class[] {Uri.class, IPackageInstallObserver.class, int.class, String.class};
  Class[] uninstalltypes = new Class[] {String.class, IPackageDeleteObserver.class, int.class};
  
  Method method = pm.getClass().getMethod("installPackage", types);
  Method uninstallmethod = pm.getClass().getMethod("deletePackage", uninstalltypes);

• 实现回调接口

  private OnPackagedObserver onInstalledPackaged;
  class PackageInstallObserver extends IPackageInstallObserver.Stub {
  
  public void packageInstalled(String packageName, int returnCode) throws RemoteException {
  if (onInstalledPackaged != null) {
    onInstalledPackaged.packageInstalled(packageName, returnCode);
  }
  }
  }
  
  class PackageDeleteObserver extends IPackageDeleteObserver.Stub {
  
  public void packageDeleted(String packageName, int returnCode) throws RemoteException {
  if (onInstalledPackaged != null) {
    onInstalledPackaged.packageDeleted(packageName, returnCode);
  }
  }
  }

• 实现
  卸载接口只需要提供要卸载的应用的包名packagename ,安装提供了三个接口

  public void uninstallPackage(String packagename) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {
    uninstallmethod.invoke(pm, new Object[] {packagename, observerdelete, 0});
  }
  public void installPackage(String apkFile) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {
  installPackage(new File(apkFile));
  }
  
  public void installPackage(File apkFile) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {
  if (!apkFile.exists()) throw new IllegalArgumentException();
  Uri packageURI = Uri.fromFile(apkFile);
  installPackage(packageURI);
  }
  
  public void installPackage(Uri apkFile) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {
  method.invoke(pm, new Object[] {apkFile, observer, INSTALL_REPLACE_EXISTING, null});
  }

签名

生成一个apk文件，需要对这个apk文件进行系统签名，由于
是系统应用需要的权限，在开发应用时，如果加载AndroidManifest.xml
中会编译不过，需要先用工具 apktool 工具先把apk文件解压出来，用编辑器在AndroidManifest.xml中加入上面的两个权限，然后在用工具apktool重新打包

具体的使用方法参考 [Android实践 -- Apktool的使用](http://blog.csdn.net/coderminer/article/details/52815890)

• 解压

  apktool d test.apk

• 修改之后，重新打包

  apktool b test

  签名之后的文件，需要在进行系统签名
  具体的使用方法请参考 Android实践 – 对apk进行系统签名

  java -jar signapk.jar platform.x509.pem platform.pk8 test.apk test_signed.apk

  将签名之后的文件 push到手机中，需要root权限

具体的代码实现

源码

附录，安装卸载错误码速查

回调中的returnCode在PackageManager中的相关的定义如下：
* 安装错误码

  public static final int INSTALL_SUCCEEDED = 1;
  public static final int INSTALL_FAILED_ALREADY_EXISTS = -1;
  public static final int INSTALL_FAILED_INVALID_APK = -2;
  public static final int INSTALL_FAILED_INVALID_URI = -3;
  public static final int INSTALL_FAILED_INSUFFICIENT_STORAGE = -4;
  public static final int INSTALL_FAILED_DUPLICATE_PACKAGE = -5;
  public static final int INSTALL_FAILED_NO_SHARED_USER = -6;
  public static final int INSTALL_FAILED_UPDATE_INCOMPATIBLE = -7;
  public static final int INSTALL_FAILED_SHARED_USER_INCOMPATIBLE = -8;
  public static final int INSTALL_FAILED_MISSING_SHARED_LIBRARY = -9;
  public static final int INSTALL_FAILED_REPLACE_COULDNT_DELETE = -10;
  public static final int INSTALL_FAILED_DEXOPT = -11;
  public static final int INSTALL_FAILED_OLDER_SDK = -12;
  public static final int INSTALL_FAILED_CONFLICTING_PROVIDER = -13;
  public static final int INSTALL_FAILED_NEWER_SDK = -14;
  public static final int INSTALL_FAILED_TEST_ONLY = -15;
  public static final int INSTALL_FAILED_CPU_ABI_INCOMPATIBLE = -16;
  public static final int INSTALL_FAILED_MISSING_FEATURE = -17;
  public static final int INSTALL_FAILED_CONTAINER_ERROR = -18;
  public static final int INSTALL_FAILED_INVALID_INSTALL_LOCATION = -19;
  public static final int INSTALL_FAILED_MEDIA_UNAVAILABLE = -20;
  public static final int INSTALL_FAILED_VERIFICATION_TIMEOUT = -21;
  public static final int INSTALL_FAILED_VERIFICATION_FAILURE = -22;
  public static final int INSTALL_FAILED_PACKAGE_CHANGED = -23;
  public static final int INSTALL_FAILED_UID_CHANGED = -24;
  public static final int INSTALL_FAILED_VERSION_DOWNGRADE = -25;
  public static final int INSTALL_FAILED_PERMISSION_MODEL_DOWNGRADE = -26;
  public static final int INSTALL_PARSE_FAILED_NOT_APK = -100;
  public static final int INSTALL_PARSE_FAILED_BAD_MANIFEST = -101;
  public static final int INSTALL_PARSE_FAILED_UNEXPECTED_EXCEPTION = -102;
  public static final int INSTALL_PARSE_FAILED_NO_CERTIFICATES = -103;
  public static final int INSTALL_PARSE_FAILED_INCONSISTENT_CERTIFICATES = -104;
  public static final int INSTALL_PARSE_FAILED_CERTIFICATE_ENCODING = -105;
  public static final int INSTALL_PARSE_FAILED_BAD_PACKAGE_NAME = -106;
  public static final int INSTALL_PARSE_FAILED_BAD_SHARED_USER_ID = -107;
  public static final int INSTALL_PARSE_FAILED_MANIFEST_MALFORMED = -108;
  public static final int INSTALL_PARSE_FAILED_MANIFEST_EMPTY = -109;
  public static final int INSTALL_FAILED_INTERNAL_ERROR = -110;
  public static final int INSTALL_FAILED_USER_RESTRICTED = -111;
  public static final int INSTALL_FAILED_DUPLICATE_PERMISSION = -112;
  public static final int INSTALL_FAILED_NO_MATCHING_ABIS = -113;
  public static final int NO_NATIVE_LIBRARIES = -114;
  public static final int INSTALL_FAILED_ABORTED = -115;

• 卸载错误码

  public static final int DELETE_SUCCEEDED = 1;
  public static final int DELETE_FAILED_INTERNAL_ERROR = -1;
  public static final int DELETE_FAILED_DEVICE_POLICY_MANAGER = -2;
  public static final int DELETE_FAILED_USER_RESTRICTED = -3;
  public static final int DELETE_FAILED_OWNER_BLOCKED = -4;
  public static final int DELETE_FAILED_ABORTED = -5;