需求是这样的，客户要求提供系统的接口来控制apk的安装和卸载，接口如下

boolean setAppInstallationPolicies(int mode, String[] appPackageNames)mode：应用名单类型0：黑名单(应用包名列表中的所有项都不允许安装)；1：白名单(只允许安装应用包名列表中的项)。appPackageNames：应用包名列表。当appPackageNames为空时，取消所有已设定的应用。成功返回true；失败返回false。String[] getAppInstallationPolicies()返回值为当前应用安装管控状态string[0]：功能模式，参见setAppInstallationPolicies方法的mode参数。string[1]至string[n-1]：应用包名列表。 boolean setAppUninstallationPolicies(int mode, String[] appPackageNames)mode：应用名单类型0：黑名单(应用包名列表中的所有项均强制卸载)；1：白名单(应用包名列表中的所有项禁止卸载)。appPackageNames：应用包名列表。当appPackageNames为空时，取消所有已设定的应用。成功返回true；失败返回false。String[] getAppUninstallationPolicies()返回值为当前应用卸载管控状态string[0]：功能模式，参见setAppUninstallationPolicies方法的mode参数。string[1]至string[n-1]：应用包名列表。

android版本为9.0，首先想到的是在系统里面添加一个自己的service,分别在frameworks/base/core/java/android/app/添加IPolicyManager.aidl，frameworks/base/services/core/java/com/android/server/添加PolicyManagerService.java，在frameworks/base/添加policy/java/ga/mdm/PolicyManager.java，内容如下

package android.app; /** {@hide} */interface IPolicyManager{ boolean setAppInstallationPolicies(int mode,inout String[] appPackageNames); String[] getAppInstallationPolicies(); boolean setAppUninstallationPolicies(int mode,inout String[] appPackageNames); String[] getAppUninstallationPolicies(); }package com.android.server; import android.content.Context;import android.content.Intent;import android.content.IntentFilter; import android.os.ServiceManager;import android.os.SystemProperties;import android.provider.Settings;import android.util.Slog; import java.lang.reflect.Field;import java.util.ArrayList; import android.app.IPolicyManager;import android.net.wifi.WifiManager;import android.content.pm.PackageManager;import android.app.ActivityManager;import android.content.pm.IPackageDataObserver; public class PolicyManagerService extends IPolicyManager.Stub { private final String TAG = "PolicyManagerService"; private Context mContext; private String[] mAppPackageNames = null; private String[] mAppUninstallPackageNames = null; public PolicyManagerService(Context context) { mContext = context; } @Override public boolean setAppInstallationPolicies(int mode, String[] appPackageNames){ if(mode==0){ Settings.System.putInt(mContext.getContentResolver(),"customer_app_status", 0); }else if(mode==1){ Settings.System.putInt(mContext.getContentResolver(),"customer_app_status", 1); }else{ return false; } mAppPackageNames = appPackageNames; return true; } @Override public String[] getAppInstallationPolicies(){ return mAppPackageNames; } @Override public boolean setAppUninstallationPolicies(int mode,String[] appPackageNames){ if(mode==0){ Settings.System.putInt(mContext.getContentResolver(),"customer_appuninstall_status", 0); }else if(mode==1){ Settings.System.putInt(mContext.getContentResolver(),"customer_appuninstall_status", 1); }else{ return false; } mAppUninstallPackageNames = appPackageNames; return true; } @Override public String[] getAppUninstallationPolicies(){ return mAppUninstallPackageNames; }}package ga.mdm; import android.util.Slog;import android.os.RemoteException;import android.content.Context;import android.app.IPolicyManager; public class PolicyManager { private final String TAG = "PolicyManager"; Context mContext; private final IPolicyManager mService; public PolicyManager(Context context,IPolicyManager mService) { mContext = context; this.mService = mService; } public boolean setAppInstallationPolicies(int mode,String[] appPackageNames){ try { return mService.setAppInstallationPolicies(mode,appPackageNames); } catch (RemoteException ex) { ex.printStackTrace(); return false; } } public String[] getAppInstallationPolicies(){ try { return mService.getAppInstallationPolicies(); } catch (RemoteException ex) { ex.printStackTrace(); return null; } } public boolean setAppUninstallationPolicies(int mode,String[] appPackageNames){ try { return mService.setAppUninstallationPolicies(mode,appPackageNames); } catch (RemoteException ex) { ex.printStackTrace(); return false; } } public String[] getAppUninstallationPolicies(){ try { return mService.getAppUninstallationPolicies(); } catch (RemoteException ex) { ex.printStackTrace(); return null; } } }

同时在frameworks/base/policy/添加Android.mk

# Copyright (C) 2014 The Android Open Source Project## Licensed under the Apache License, Version 2.0 (the "License");# you may not use this file except in compliance with the License.# You may obtain a copy of the License at## http://mitted to an install location if (origin.staged) { if (origin.file != null) { installFlags |= PackageManager.INSTALL_INTERNAL; installFlags &= ~PackageManager.INSTALL_EXTERNAL; } else { throw new IllegalStateException("Invalid stage location"); } } final boolean onSd = (installFlags & PackageManager.INSTALL_EXTERNAL) != 0; final boolean onInt = (installFlags & PackageManager.INSTALL_INTERNAL) != 0; final boolean ephemeral = (installFlags & PackageManager.INSTALL_INSTANT_APP) != 0; PackageInfoLite pkgLite = null; if (onInt && onSd) { // Check if both bits are set. Slog.w(TAG, "Conflicting flags specified for installing on both internal and external"); ret = PackageManager.INSTALL_FAILED_INVALID_INSTALL_LOCATION; } else if (onSd && ephemeral) { Slog.w(TAG, "Conflicting flags specified for installing ephemeral on external"); ret = PackageManager.INSTALL_FAILED_INVALID_INSTALL_LOCATION; } else { pkgLite = mContainerService.getMinimalPackageInfo(origin.resolvedPath, installFlags, packageAbiOverride); //add by jueme PolicyManager policyManager = (PolicyManager)mContext.getSystemService("policy"); String[] appNames = policyManager.getAppInstallationPolicies(); if(appNames!=null && appNames.length>0){ int app_status = android.provider.Settings.System.getInt(mContext.getContentResolver(),"customer_app_status", -1); Slog.w(TAG,"app_status "+app_status); if(app_status==0){ for (int i = 0; i < appNames.length; i++) { Slog.w(TAG,"appNames 0 "+appNames[i]); if (pkgLite.packageName.equals(appNames[i])){ ret = PackageManager.INSTALL_FAILED_INVALID_INSTALL_LOCATION; break; } } }else if(app_status==1){ for (int i = 0; i < appNames.length; i++) { Slog.w(TAG,"appNames 1 "+appNames[i]); if (pkgLite.packageName.equals(appNames[i])){ ret = PackageManager.INSTALL_SUCCEEDED; break; }else{ ret = PackageManager.INSTALL_FAILED_INVALID_INSTALL_LOCATION; } } } } //add end

这样在安装时候就会报安装位置不对的信息。

接着是禁止卸载，在PackageInstallerService.java的uninstall添加下面的方法。

@Override public void uninstall(VersionedPackage versionedPackage, String callerPackageName, int flags, IntentSender statusReceiver, int userId) throws RemoteException { //add by jueme PolicyManager policyManager = (PolicyManager)mContext.getSystemService("policy"); String[] appNames = policyManager.getAppUninstallationPolicies(); if(appNames!=null && appNames.length>0){ int appuninstall_status = android.provider.Settings.System.getInt(mContext.getContentResolver(),"customer_appuninstall_status", -1); Slog.w(TAG,"appuninstall_status "+appuninstall_status+" mInstallerPackageName "+versionedPackage.getPackageName()); boolean isUninstall = true;//默认都是可卸载 if(appuninstall_status==0){ for (int i = 0; i < appNames.length; i++) { if (versionedPackage.getPackageName().equals(appNames[i])){ isUninstall = true; break; }else{ isUninstall = false; } } if(!isUninstall){ return; } }else if(appuninstall_status==1){ //应用包名列表中的所有项禁止卸载 for (int i = 0; i < appNames.length; i++) { if (versionedPackage.getPackageName().equals(appNames[i])){ isUninstall = false; break; }else{ isUninstall = true; } } if(!isUninstall){ return; } } } //add end

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