Android 静默安装如何实现（需要有ROOT权限），静默安装就是：app自动下载，自动安装，自动重新启动（可以设置重新启动打开哪个活动）

前提是手机需要被ROOT，也就是安卓设备需要被ROOT。需要知道apk文件的保存路径（绝对路径）
请看java代码

    //需要传下载后的apk的绝对路径和当前上下文，这个方法的返回值表示为：安装成功是true，安装失败是false    //apkPath:apk文件的绝对路径    public static boolean clientInstall(String apkPath,Context context) {        boolean result = false;        DataOutputStream dataOutputStream = null;        BufferedReader errorStream = null;        BufferedReader successStream = null;        Process process = null;        try {            // 申请 su 权限            process = Runtime.getRuntime().exec("su");            dataOutputStream = new DataOutputStream(process.getOutputStream());            // 执行 pm install 命令  （这是apk安装命令）            String command = "pm install -r " + apkPath + "\n";            //执行  am start -n   命令   （这是apk重启命令）    -----.MainActivity是默认重启app后要打开哪个界面            String runApp = "am start -n  "+context.getPackageName()+"/"+context.getPackageName()+".MainActivity >>/dev/null 2>&1;";            //这样子写也是可以的，用\n结尾也可以            // String runApp = "am start -n  "+context.getPackageName()+"/"+context.getPackageName()+".MainActivity"+ "\n";            command=command+runApp;            Log.d("111333","走到这里，---------------打印静默安装命令="+command);            dataOutputStream.write(command.getBytes(Charset.forName("UTF-8")));            dataOutputStream.writeBytes("exit\n");            Log.d("111333","走到这里，---------------打印静默安装完成");            dataOutputStream.flush();            process.waitFor();            errorStream = new BufferedReader(new InputStreamReader(process.getErrorStream()));            StringBuilder errorMsg = new StringBuilder();            String line;            while ((line = errorStream.readLine()) != null) {                errorMsg.append(line);            }            Log.d("111333","走到这里，---------------silent install error message:{}="+errorMsg);            StringBuilder successMsg = new StringBuilder();            successStream = new BufferedReader(new InputStreamReader(process.getInputStream()));            // 读取命令执行结果            while ((line = successStream.readLine()) != null) {                successMsg.append(line);            }            Log.d("111333","走到这里，---------------silent install success message:{}="+successMsg);            // 如果执行结果中包含 Failure 字样就认为是操作失败，否则就认为安装成功            if (!(errorMsg.toString().contains("Failure") || successMsg.toString().contains("Failure"))) {                result = true;            }        } catch (Exception e) {            Log.d("111333","走到这里，---------------e="+e);        } finally {            try {                if (process != null) {                    process.destroy();                }                if (dataOutputStream != null) {                    dataOutputStream.close();                }                if (errorStream != null) {                    errorStream.close();                }                if (successStream != null) {                    successStream.close();                }            } catch (Exception e) {                // ignored            }        }        return result;    }

来源地址：https://blog.csdn.net/qq_36570506/article/details/131593699