Android静默安装实现

Android静默安装的方案有很多种，如利用ProcessBuilder或者Runtime.getRuntime().exec()运行pm isntall命令，但此方法需要先su，需要root权限，或者反射获取PackageManager.installPackage()，使用起来也比较繁琐，同时需要获取系统权限，在API21以上可以是用PackageInstaller.Secssion实现静默安装，该接口也需要获取系统权限android.permission.INSTALL_PACKAGES，不多说，直接上代码。

 public void install(@NonNull Context context,@NonNull String path) throws Exception {        File file=new File(path);        String apkName=path.substring(path.lastIndexOf(File.separator)+1,path.lastIndexOf(".apk"));//获取PackageInstallerPackageInstaller packageInstaller = context.getPackageManager()                .getPackageInstaller();        PackageInstaller.SessionParams params=new PackageInstaller                .SessionParams(PackageInstaller.SessionParams.MODE_FULL_INSTALL);        PackageInstaller.Session session=null;        OutputStream outputStream=null;        FileInputStream inputStream=null;        try {//创建Session            int sessionId = packageInstaller.createSession(params);//开启Session            session=packageInstaller.openSession(sessionId);//获取输出流，用于将apk写入session            outputStream = session.openWrite(apkName, 0, -1);            inputStream=new FileInputStream(file);            byte[] buffer=new byte[4096];            int n;//读取apk文件写入session            while ((n=inputStream.read(buffer))>0){                outputStream.write(buffer,0,n);            }//写完需要关闭流，否则会抛异常“files still open”            inputStream.close();            inputStream=null;            outputStream.flush();            outputStream.close();            outputStream=null;//配置安装完成后发起的intent，通常是打开activity            Intent intent=new Intent();            PendingIntent pendingIntent=PendingIntent.getActivity(mContext,0,intent,0);            IntentSender intentSender = pendingIntent.getIntentSender();//提交启动安装            session.commit(intentSender);        } catch (IOException e) {            throw new RuntimeException("Couldn't install package", e);        } catch (RuntimeException e) {            if (session != null) {                session.abandon();            }            throw e;        }finally {            closeStream(inputStream);            closeStream(outputStream);        }    }

注释已经解释得很清楚，就不在多讲解，如需获取安装过程的状态，可以在createSession前给PackageInataller注册SessionCallback获取

packageInstaller.registerSessionCallback(new PackageInstaller.SessionCallback() {            @Override            public void onCreated(int sessionId) {                            }            @Override            public void onBadgingChanged(int sessionId) {            }            @Override            public void onActiveChanged(int sessionId, boolean active) {            }            @Override            public void onProgressChanged(int sessionId, float progress) {            }            @Override            public void onFinished(int sessionId, boolean success) {            }        });

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