Android(安卓)后台静默安装

后台静默安装，就无需写代码调用系统的 PackageInstaller 接口，直接使用指令的方式去执行。
与cmd直接执行 adb install 不同，代码中需要使用 pm 这个系统bin文件

    private void startUpdate() {        Process process = null;        BufferedReader successResult = null;        BufferedReader errorResult = null;        StringBuilder successMsg = new StringBuilder();        StringBuilder errorMsg = new StringBuilder();        try {            **// 7.0以后版本需要额外添加            //           "-i", "当前应用包名",             // 两个字段，并且需要应用支持 android.permission.INSTALL_PACKAGES 权限**            process = new ProcessBuilder("pm", "install", "-i", "当前应用包名", "-r", "sdcard/test.apk").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) {            Log.e(TAG, "Exception " + e.toString());        } finally {            try {                if (successResult != null) {                    successResult.close();                }                if (errorResult != null) {                    errorResult.close();                }            } catch (Exception e) {            }            if (process != null) {                process.destroy();            }        }        Log.e(TAG, "errorMsg " + errorMsg.toString());        Log.d(TAG, "successMsg " + successMsg.toString());    }

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