Android节点读写实现

在工作中，我们会对一些节点进行读写操作。比如控制闪光灯，指示灯;降噪芯片开关或其低功耗开关，因为项目中常用到，在此记录，备忘～

直接上代码，想用直接拿去

一监听某个节点的写入值的反馈

有些节点写入是可以监听到写入结果的，比如降噪芯片低功耗节点写入后可以监听其写入结果，代码如下

java">/*** 读取操作低功耗的开启/关闭结果*/
private void readOpenLowPowerCOnsumptionResult() {Log.e(TAG, "readOpenLowPowerCOnsumptionResult init");new Thread(() -> {try {File deviceFile = new File("/dev/ttyS0");if (!deviceFile.exists()) {Log.e(TAG,"Device file not found: " + "/dev/ttyS0");return;}FileInputStream fis = new FileInputStream(deviceFile);BufferedReader reader = new BufferedReader(new InputStreamReader(fis));Log.d(TAG, "Reading from " + "/dev/ttyS0" + "...");String line;while ((line = reader.readLine()) != null) {Log.d(TAG,"Log: " + line);if ("OK: low_pw 1".equals(line)) {Log.e(TAG, "auxstatus open low_pw success");// isWaitingRead =false;}else if ("OK: low_pw 0".equals(line)) {Log.e(TAG, "auxstatus close low_pw success");// isWaitingRead =false;}else {Log.e(TAG, "readOpenAudResult result :" + line);}}Log.d(TAG, "Reading from " + "/dev/ttyS0" + "---");reader.close();} catch (IOException e) {e.printStackTrace();Log.e(TAG, "Error reading from /dev/ttyS0");}}).start();}

二写入节点

2.1

java">/*** 开启降噪低功耗模式* @param  isOpen true：开启低功耗;false 关闭低功耗* @return        [description]*/
private synchronized boolean openAudLowPower(boolean isOpen) {Log.d(TAG, "openAudLowPower init----1 isOpen:" + isOpen);java.lang.Process process = null;DataOutputStream os = null;try {String[] command = {"sh"};process = Runtime.getRuntime().exec(command);os = new DataOutputStream(process.getOutputStream());os.writeBytes( "stty -F /dev/ttyS0 -echo\n");os.writeBytes( "stty -F /dev/ttyS0 ispeed 115200 ospeed 115200 cs8\n");if (isOpen) {os.writeBytes("printf 'low_pw 1' > /dev/ttyS0\n");}else {os.writeBytes("printf 'low_pw 0' > /dev/ttyS0\n");}os.writeBytes("exit\n");os.flush();int result = process.waitFor();Log.d(TAG, "openAudch result : " + result);} catch (Exception e) {Log.d(TAG, "openAudLowPower exception msg: " + e.getMessage());Log.e(TAG, "openAudLowPower , send error");e.printStackTrace();return false;} finally {try {if (os != null) {os.close();}process.destroy();} catch (Exception e) {Log.e(TAG, "send error");return false;}Log.e(TAG, "openAudLowPower finally end");}return true;}

2.2还有使用echo 实现写入节点，代码如下

java"> public boolean openEncLvl() {if (DEBUG_INPUT) {Slog.d(TAG, "openEncLvl init---- ");}java.lang.Process process = null;DataOutputStream os = null;try {process = Runtime.getRuntime().exec("sh");os = new DataOutputStream(process.getOutputStream());os.writeBytes( "stty -F /dev/ttyS0 -echo\n");os.writeBytes( "stty -F /dev/ttyS0 ispeed 115200 cs8\n");os.writeBytes( "echo enc_lvl 1 > /dev/ttyS0\n");os.writeBytes("exit\n");os.flush();process.waitFor();} catch (Exception e) {if (DEBUG_INPUT) {Slog.d(TAG, "openEncLvl exception msg: " + e.getMessage());}Log.e(TAG, "openEncLvl , 发送失败。");e.printStackTrace();return false;} finally {try {if (os != null) {os.close();}process.destroy();} catch (Exception e) {Log.e(TAG, "发送失败");return false;}if (DEBUG_INPUT) {Slog.d(TAG, "openEncLvl finally end");}}return true;}

2.1和2.2 实现的区别就是写入值的时候

2.1如下实现：

os.writeBytes("printf 'low_pw 1' > /dev/ttyS0\n");

2.2如下实现：

os.writeBytes( "echo enc_lvl 1 > /dev/ttyS0\n");

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若使用直接拿去，可运行！

大家新年快乐～