这里提供两个Android系统下静默安装应用和静默卸载应用的方法，在 5.1 版本系统上运行通过。当然，运行代码的应用需要有系统权限，这就需要应用通过系统签名文件进行签名了，需要使用到 platform.pk8 和 platform.x509.pem 两个文件，可以参照我的另一篇文章：Android 用 platform.pk8 和 platform.x509.pem 生成 keystore 系统签名文件

   /**
     * 静默安装App
     *
     * @param apkPath apk路径
     * @return 是否安装成功
     */
    public static boolean installApp(String apkPath) {
        Process process = null;
        BufferedReader successResult = null;
        BufferedReader errorResult = null;
        StringBuilder successMsg = new StringBuilder();
        StringBuilder errorMsg = new StringBuilder();
        try {
            process = new ProcessBuilder("pm", "install", "-r", apkPath).start();
            successResult = new BufferedReader(new InputStreamReader(process.getInputStream()));
            errorResult = new BufferedReader(new InputStreamReader(process.getErrorStream()));
            String s;
            while ((s = successResult.readLine()) != null) {
                successMsg.append(s);
            }
            while ((s = errorResult.readLine()) != null) {
                errorMsg.append(s);
            }
        } catch (Exception e) {

        } finally {
            try {
                if (successResult != null) {
                    successResult.close();
                }
                if (errorResult != null) {
                    errorResult.close();
                }
            } catch (Exception e) {

            }
            if (process != null) {
                process.destroy();
            }
        }
        //如果含有“success”单词则认为安装成功
        return successMsg.toString().equalsIgnoreCase("success");
    }

    /**
     * 静默卸载App
     *
     * @param packageName 包名
     * @return 是否卸载成功
     */
    public static boolean uninstallApp(String packageName) {
        Process process = null;
        BufferedReader successResult = null;
        BufferedReader errorResult = null;
        StringBuilder successMsg = new StringBuilder();
        StringBuilder errorMsg = new StringBuilder();
        try {
            process = new ProcessBuilder("pm", "uninstall", packageName).start();
            successResult = new BufferedReader(new InputStreamReader(process.getInputStream()));
            errorResult = new BufferedReader(new InputStreamReader(process.getErrorStream()));
            String s;
            while ((s = successResult.readLine()) != null) {
                successMsg.append(s);
            }
            while ((s = errorResult.readLine()) != null) {
                errorMsg.append(s);
            }
        } catch (Exception e) {

        } finally {
            try {
                if (successResult != null) {
                    successResult.close();
                }
                if (errorResult != null) {
                    errorResult.close();
                }
            } catch (Exception e) {

            }
            if (process != null) {
                process.destroy();
            }
        }
        //如果含有“success”单词则认为卸载成功
        return successMsg.toString().equalsIgnoreCase("success");
    }

    /**
     * 判断应用是否存在
     *
     * @param context     上下文
     * @param packageName 包名
     * @return 是否存在
     */
    private boolean appExist(Context context, String packageName) {
        try {
            List<PackageInfo> packageInfoList = context.getPackageManager().getInstalledPackages(0);
            for (PackageInfo packageInfo : packageInfoList) {
                if (packageInfo.packageName.equalsIgnoreCase(packageName)) {
                    return true;
                }
            }
        } catch (Exception e) {

        }
        return false;
    }