我们在工作中经常遇到一些客户提出静默安装与静默卸载的需求，应该说这个问题是比较简单的，但总有人在问，所以这里简单记录一下。

    /**
     * 静默安装
     * @param apkFilePath 文件名
     * @param installOnSdCard 是否安装到SD卡
     * @return
     */
    public boolean installApplication(String apkFilePath,boolean installOnSdCard){
        PackageInstallObserver installObserver = new PackageInstallObserver();
        File file=new File(apkFilePath);
        Uri uri=Uri.fromFile(file);
        //一般客户给的参数就是apk文件的路径，包名必须通过以下方式进行解析
        PackageParser packageParser=new PackageParser();
        String packageName=null;
        try{
            ApplicationInfo appInfo=packageParser.parsePackage(file, 0).applicationInfo;
            packageName=appInfo.packageName;
        }catch(PackageParserException ex){
            return false;
        }           
        PackageManager pm = mContext.getPackageManager();
        int installFlags = 0;
        try {
            PackageInfo pi = pm.getPackageInfo(packageName,
                    PackageManager.GET_UNINSTALLED_PACKAGES);
            if (pi != null) {
                installFlags |= PackageManager.INSTALL_REPLACE_EXISTING;
            }
        } catch (NameNotFoundException e) {
            Log.i(TAG,"NameNotFoundException");
        }
        if(installOnSdCard){
            installFlags|=PackageManager.INSTALL_EXTERNAL;
        }else{
            installFlags|=PackageManager.INSTALL_INTERNAL;
        }
        installFlags |= PackageManager.INSTALL_REPLACE_EXISTING;
        pm.installPackage(uri, installObserver, installFlags, packageName);     
        synchronized(installObserver){          
            long waitTime = 0;
            while (!installObserver.doneFlag) {
                Log.i(TAG,"installObserver.returnCode="+installObserver.returnCode);
                try {
                    installObserver.wait();
                //可以设置一个安装超时的时间
                //  waitTime += WAIT_TIME_INCR;
                } catch (InterruptedException e) {
                    Log.i(TAG, "Interrupted during sleep", e);
                    return false;
                }
            }
            return installObserver.returnCode==1?true:false;
        }       
    }

核心api：installPackage，关键参数：installObserver

    /**
     * 监听应用安装
     */
    class PackageInstallObserver extends IPackageInstallObserver.Stub{
        public int returnCode;
        private boolean doneFlag = false;
        public void packageInstalled(String packageName, int returnCode) {
            synchronized(this){
                this.returnCode = returnCode;
                Log.i(TAG,"returnCode="+returnCode);
                doneFlag = true;
                notifyAll();
            }
        }
    }

同理，静默卸载类似如下：

     /**
     * 静默卸载
     * @param packageName 应用名
     * @param keepDataAndCache 是否保留数据
     * @return
     */
    public boolean uninstallApplication(String packageName, boolean keepDataAndCache){
        PackageDeleteObserver deleteObserver=new PackageDeleteObserver();
        PackageManager pm = mContext.getPackageManager();
        int flags=0;    
        if(keepDataAndCache)
            flags|=PackageManager.DELETE_KEEP_DATA;
        pm.deletePackage(packageName, deleteObserver, flags);
        synchronized(deleteObserver){           
            long waitTime = 0;
            while (!deleteObserver.doneFlag) {
                Log.i(TAG,"deleteObserver.returnCode="+deleteObserver.returnCode);
                try {
                    deleteObserver.wait();
                //  waitTime += WAIT_TIME_INCR;
                } catch (InterruptedException e) {
                    Log.i(TAG, "Interrupted during sleep", e);
                }
            }
            return deleteObserver.returnCode==1?true:false;
        }   
    }
    /**
     * 监听应用卸载
     */
    class PackageDeleteObserver extends IPackageDeleteObserver.Stub {
        public int returnCode;
        private boolean doneFlag = false;
        public void packageDeleted(String packageName,int returnCode){
            synchronized(this){
                this.returnCode = returnCode;
                Log.i(TAG,"returnCode="+returnCode);
                doneFlag = true;
                notifyAll();
            }
        }
    }

最后，别忘了在子线程中进行操作。