公司產品基於7.0開發，需要實現覆蓋升級。之前的產品覆蓋升級基於5.1系統，在7.0上不起作用。網上參考了許多部落格。最終稀裡糊塗的成功了，簡單記錄。

核心程式碼只有一句

String command = "pm install -r -i 包名 --user 0 apk路徑";

execInstallCommand(new String[]{command})

 public static void execInstallCommand(String[] commands) {
        Process process = null;
        BufferedReader successResult = null;
        BufferedReader errorResult = null;

        DataOutputStream os = null;
        try {

            process = Runtime.getRuntime().exec("su");
            os = new DataOutputStream(process.getOutputStream());
            for (String command : commands) {
                if (command == null) {
                    continue;
                }
                // donnot use os.writeBytes(commmand), avoid chinese charset error
                os.write(command.getBytes());
                os.writeBytes(COMMAND_LINE_END);
                os.flush();
            }
            os.writeBytes(COMMAND_EXIT);
            os.flush();
            // get command result
        } catch (IOException e) {
            Log.e(TAG,e.getMessage());
        } catch (Exception e) {
            Log.e(TAG,e.getMessage());
        } finally {
            try {
                if (os != null) {
                    os.close();
                }
                if (successResult != null) {
                    successResult.close();
                }
                if (errorResult != null) {
                    errorResult.close();
                }
            } catch (IOException e) {
                Log.e(TAG, "execCommand: ", e);
            }

            if (process != null) {
                process.destroy();
            }
        }
    }