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android串口編程

發布時間: 2022-11-28 11:16:21

Ⅰ android_studio手機藍牙串口通信源代碼

初涉android的藍牙操作,按照固定MAC地址連接獲取Device時,程序始終是異常終止,查了好多天代碼都沒查出原因。今天改了一下API版本,突然就成功連接了。總結之後發現果然是個坑爹之極的錯誤。

為了這種錯誤拚命查原因浪費大把時間是非常不值得的,但是問題不解決更是揪心。可惜我網路了那麼多,都沒有給出確切原因。今天特此mark,希望後來者遇到這個問題的時候能輕松解決。

下面是我的連接過程,中間崩潰原因及解決辦法。

1:用AT指令獲得藍牙串口的MAC地址,地址是簡寫的,按照常理猜測可得標准格式。

2:開一個String adress= "************" //MAC地址, String MY_UUID= "************"//UUID根據通信而定,網上都有。

3:取得本地Adapter用getDefaultAdapter(); 遠程的則用getRemoteDevice(adress); 之後便可用UUID開socket進行通信。

如果中途各種在getRemoteDevice處崩潰,大家可以查看一下當前的API版本,如果是2.1或以下版本的話,便能確定是API版本問題,只要換成2.2或者以上就都可以正常運行了~ 這么坑爹的錯誤的確很為難初學者。 唉·········· 為這種小trick浪費很多時間真是難過。

(另外有個重要地方,別忘了給manifest裡面加以下兩個藍牙操作許可權哦~)

  • <uses-permissionandroid:name="android.permission.BLUETOOTH"></uses-permission>

  • <uses-permissionandroid:name="android.permission.BLUETOOTH_ADMIN"></uses-permission>

  • 下面附上Android藍牙操作中用固定MAC地址傳輸信息的模板,通用搜索模式日後再補刪模板:

  • =null;

  • =null;

  • privateOutputStreamoutStream=null;

  • privateInputStreaminStream=null;

  • privatestaticfinalUUIDMY_UUID=UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");//這條是藍牙串口通用的UUID,不要更改

  • privatestaticStringaddress="00:12:02:22:06:61";//<==要連接的藍牙設備MAC地址

  • /*獲得通信線路過程*/

  • /*1:獲取本地BlueToothAdapter*/

  • mBluetoothAdapter=BluetoothAdapter.getDefaultAdapter();

  • if(mBluetoothAdapter==null)

  • {

  • Toast.makeText(this,"Bluetoothisnotavailable.",Toast.LENGTH_LONG).show();

  • finish();

  • return;

  • }

  • if(!mBluetoothAdapter.isEnabled())

  • {

  • Toast.makeText(this,"-runthisprogram.",Toast.LENGTH_LONG).show();

  • finish();

  • return;

  • }

  • /*2:獲取遠程BlueToothDevice*/

  • BluetoothDevicedevice=mBluetoothAdapter.getRemoteDevice(address);

  • if(mBluetoothAdapter==null)

  • {

  • Toast.makeText(this,"Can'tgetremotedevice.",Toast.LENGTH_LONG).show();

  • finish();

  • return;

  • }

  • /*3:獲得Socket*/

  • try{

  • btSocket=device.(MY_UUID);

  • }catch(IOExceptione){

  • Log.e(TAG,"ONRESUME:Socketcreationfailed.",e);

  • }

  • /*4:取消discovered節省資源*/

  • mBluetoothAdapter.cancelDiscovery();

  • /*5:連接*/

  • try{

  • btSocket.connect();

  • Log.e(TAG,"ONRESUME:BTconnectionestablished,datatransferlinkopen.");

  • }catch(IOExceptione){

  • try{

  • btSocket.close();

  • }catch(IOExceptione2){

  • Log.e(TAG,"ONRESUME:",e2);

  • }

  • }

  • /*此時可以通信了,放在任意函數中*/

  • /*try{

  • outStream=btSocket.getOutputStream();

  • inStream=btSocket.getInputStream();//可在TextView里顯示

  • }catch(IOExceptione){

  • Log.e(TAG,"ONRESUME:Outputstreamcreationfailed.",e);

  • }

  • Stringmessage="1";

  • byte[]msgBuffer=message.getBytes();

  • try{

  • outStream.write(msgBuffer);

  • }catch(IOExceptione){

  • Log.e(TAG,"ONRESUME:Exceptionringwrite.",e);

  • }

  • */

  • 通用搜索模式代碼模板:

    簡潔簡潔方式1 demo


    作用: 用VerticalSeekBar控制一個 LED屏幕的亮暗。

    直接上碼咯~

  • packagecom.example.seed2;

  • importandroid.app.Activity;

  • importandroid.app.AlertDialog;

  • importandroid.app.Dialog;

  • importandroid.os.Bundle;

  • importjava.io.IOException;

  • importjava.io.InputStream;

  • importjava.io.OutputStream;

  • importjava.util.UUID;

  • importandroid.bluetooth.BluetoothAdapter;

  • importandroid.bluetooth.BluetoothDevice;

  • importandroid.bluetooth.BluetoothSocket;

  • importandroid.content.DialogInterface;

  • importandroid.util.Log;

  • importandroid.view.KeyEvent;

  • importandroid.widget.Toast;

  • {

  • privatestaticfinalStringTAG="BluetoothTest";

  • =null;

  • =null;

  • privateOutputStreamoutStream=null;

  • privateInputStreaminStream=null;

  • privateVerticalSeekBarvskb=null;

  • privatestaticfinalUUIDMY_UUID=UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");//這條是藍牙串口通用的UUID,不要更改

  • privatestaticStringaddress="00:12:02:22:06:61";//<==要連接的藍牙設備MAC地址

  • /**.*/

  • @Override

  • publicvoidonCreate(BundlesavedInstanceState){

  • super.onCreate(savedInstanceState);

  • setContentView(R.layout.main);

  • this.vskb=(VerticalSeekBar)super.findViewById(R.id.mskb);

  • this.vskb.setOnSeekBarChangeListener(newOnSeekBarChangeListenerX());

  • mBluetoothAdapter=BluetoothAdapter.getDefaultAdapter();

  • if(mBluetoothAdapter==null)

  • {

  • Toast.makeText(this,"Bluetoothisnotavailable.",Toast.LENGTH_LONG).show();

  • finish();

  • return;

  • }

  • if(!mBluetoothAdapter.isEnabled())

  • {

  • Toast.makeText(this,"-runthisprogram.",Toast.LENGTH_LONG).show();

  • finish();

  • return;

  • }

  • }

  • .OnSeekBarChangeListener{

  • publicvoidonProgressChanged(VerticalSeekBarseekBar,intprogress,booleanfromUser){

  • //Main.this.clue.setText(seekBar.getProgress());

  • /*Stringmessage;

  • byte[]msgBuffer;

  • try{

  • outStream=btSocket.getOutputStream();

  • }catch(IOExceptione){

  • Log.e(TAG,"ONRESUME:OutputStreamcreationfailed.",e);

  • }

  • message=Integer.toString(seekBar.getProgress());

  • msgBuffer=message.getBytes();

  • try{

  • outStream.write(msgBuffer);

  • }catch(IOExceptione){

  • Log.e(TAG,"ONRESUME:Exceptionringwrite.",e);

  • }*/

  • }

  • (VerticalSeekBarseekBar){

  • Stringmessage;

  • byte[]msgBuffer;

  • try{

  • outStream=btSocket.getOutputStream();

  • }catch(IOExceptione){

  • Log.e(TAG,"ONRESUME:OutputStreamcreationfailed.",e);

  • }

  • message=Integer.toString(seekBar.getProgress());

  • msgBuffer=message.getBytes();

  • try{

  • outStream.write(msgBuffer);

  • }catch(IOExceptione){

  • Log.e(TAG,"ONRESUME:Exceptionringwrite.",e);

  • }

  • }

  • publicvoidonStopTrackingTouch(VerticalSeekBarseekBar){

  • Stringmessage;

  • byte[]msgBuffer;

  • try{

  • outStream=btSocket.getOutputStream();

  • }catch(IOExceptione){

  • Log.e(TAG,"ONRESUME:OutputStreamcreationfailed.",e);

  • }

  • message=Integer.toString(seekBar.getProgress());

  • msgBuffer=message.getBytes();

  • try{

  • outStream.write(msgBuffer);

  • }catch(IOExceptione){

  • Log.e(TAG,"ONRESUME:Exceptionringwrite.",e);

  • }

  • }

  • }

  • @Override

  • publicvoidonStart()

  • {

  • super.onStart();

  • }

  • @Override

  • publicvoidonResume()

  • {

  • super.onResume();

  • BluetoothDevicedevice=mBluetoothAdapter.getRemoteDevice(address);

  • try{

  • btSocket=device.(MY_UUID);

  • }catch(IOExceptione){

  • Log.e(TAG,"ONRESUME:Socketcreationfailed.",e);

  • }

  • mBluetoothAdapter.cancelDiscovery();

  • try{

  • btSocket.connect();

  • Log.e(TAG,"ONRESUME:BTconnectionestablished,datatransferlinkopen.");

  • }catch(IOExceptione){

  • try{

  • btSocket.close();

  • }catch(IOExceptione2){

  • Log.e(TAG,"ONRESUME:",e2);

  • }

  • }

  • //.

  • /*try{

  • outStream=btSocket.getOutputStream();

  • inStream=btSocket.getInputStream();

  • }catch(IOExceptione){

  • Log.e(TAG,"ONRESUME:Outputstreamcreationfailed.",e);

  • }

  • Stringmessage="read";

  • byte[]msgBuffer=message.getBytes();

  • try{

  • outStream.write(msgBuffer);

  • }catch(IOExceptione){

  • Log.e(TAG,"ONRESUME:Exceptionringwrite.",e);

  • }

  • intret=-1;

  • while(ret!=-1)

  • {

  • try{

  • ret=inStream.read();

  • }catch(IOExceptione)

  • {

  • e.printStackTrace();

  • }

  • }

  • */

  • }

  • @Override

Ⅱ 我想用Android手機與單片機進行串口通信,從而可以控制單片機,怎麼實現

代碼不會寫!但是給你個思路:

1、單片機串口轉WIFI了,那麼WIFI傳出來的數據,手機接收到要有軟體解碼識別它
2、手機軟體通過WIFI將數據傳到單片機,這樣交互就可以通信了。控制協議可以自己設定。

Ⅲ Android平台到底能不能通過串口發送AT指令呢,急!!!

AT命令(Attention)在手機中,用於對modem(也就是移動模塊)通過串口命令進行操作,處理與語音電話、簡訊和數據。

關於AT命令:

  1. Android系統與AT命令

    對於智能手機,AP和BP分離的情況,在AP上的系統通過串口和BP通信是個不錯方式。在Android的源碼中有一個內部包com.android.internal.telephony中有對AT命令的封裝和解析,但這種internal的包開發者不能調用的SDK部分,可以用來封裝ROM。這說明Android對AT command的方式是支持的。

  2. 對於Android如何調用AT command

    用root登錄命令行,直接對串口進行操作,如echo -e "AT " > /dev/smd0

    具體的串口,不同設備會有不同,甚至不一定會提供。這種方式,開發者是可以調用的,通過Runtime.exec直接執行命令行命令,但要求是root,例如echo -e "ATD123456789; " > /dev/smd0,撥打123456789的號碼。

  3. 目前最新的AT命令標准發布與2014.6.27,似乎還活得挺滋潤的。但是給出的keywords是UMTS, GSM, command, terminal, LTE這說明CDMA確實很可能不是採用AT命令的方式。

Ⅳ android藍牙開發,PC端模擬串口接收字元,該如何編程

您好,android藍牙這方面還是很好搞的,因為大家的方式都是差不多的。先說說如何開啟藍牙設備和設置可見時間:

private void search() {
BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
if (!adapter.isEnabled()) {
adapter.enable();
}
Intent enable = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
enable.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 3600); //3600為藍牙設備可見時間
startActivity(enable);
Intent searchIntent = new Intent(this, ComminuteActivity.class);
startActivity(searchIntent);
}

首先,需要獲得一個BluetoothAdapter,可以通過getDefaultAdapter()獲得系統默認的藍牙適配器,當然我們也可以自己指定,但這個真心沒有必要,至少我是不需要的。然後我們檢查手機的藍牙是否打開,如果沒有,通過enable()方法打開。接著我們再設置手機藍牙設備的可見,可見時間可以自定義。

完成這些必要的設置後,我們就可以正式開始與藍牙模塊進行通信了:

public class ComminuteActivity extends Activity {
private BluetoothReceiver receiver;
private BluetoothAdapter bluetoothAdapter;
private List<String> devices;
private List<BluetoothDevice> deviceList;
private Bluetooth client;
private final String lockName = "BOLUTEK";
private String message = "000001";
private ListView listView;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.search_layout);

listView = (ListView) this.findViewById(R.id.list);
deviceList = new ArrayList<BluetoothDevice>();
devices = new ArrayList<String>();
bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
bluetoothAdapter.startDiscovery();
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
receiver = new BluetoothReceiver();
registerReceiver(receiver, filter);

listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
setContentView(R.layout.connect_layout);
BluetoothDevice device = deviceList.get(position);
client = new Bluetooth(device, handler);
try {
client.connect(message);
} catch (Exception e) {
Log.e("TAG", e.toString());
}
}
});
}

@Override
protected void onDestroy() {
unregisterReceiver(receiver);
super.onDestroy();
}

private final Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case Bluetooth.CONNECT_FAILED:
Toast.makeText(ComminuteActivity.this, "連接失敗", Toast.LENGTH_LONG).show();
try {
client.connect(message);
} catch (Exception e) {
Log.e("TAG", e.toString());
}
break;
case Bluetooth.CONNECT_SUCCESS:
Toast.makeText(ComminuteActivity.this, "連接成功", Toast.LENGTH_LONG).show();
break;
case Bluetooth.READ_FAILED:
Toast.makeText(ComminuteActivity.this, "讀取失敗", Toast.LENGTH_LONG).show();
break;
case Bluetooth.WRITE_FAILED:
Toast.makeText(ComminuteActivity.this, "寫入失敗", Toast.LENGTH_LONG).show();
break;
case Bluetooth.DATA:
Toast.makeText(ComminuteActivity.this, msg.arg1 + "", Toast.LENGTH_LONG).show();
break;
}
}
};

private class BluetoothReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
if (isLock(device)) {
devices.add(device.getName());
}
deviceList.add(device);
}
showDevices();
}
}

private boolean isLock(BluetoothDevice device) {
boolean isLockName = (device.getName()).equals(lockName);
boolean isSingleDevice = devices.indexOf(device.getName()) == -1;
return isLockName && isSingleDevice;
}

private void showDevices() {
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,
devices);
listView.setAdapter(adapter);
}
}

Ⅳ android虛擬機串口通信

工具:Virtual Serial Port Driver.
用這個工具虛擬出一對串口。
下載地址

2.用串口調試助手,測試串口通信。
3.用這個命令啟動虛擬機:emulator @2.2 -scale auto -qemu -serial COM3 &
說明:
2.2:是虛擬機的名稱。
COM3是你要選擇的串口。
ps:在cmd中使用這個命令有兩種方式:1)將安卓的sdk的tools文件夾加入到path環境變數中,2)在安卓的sdk的tools文件夾下打開cmd。
4.虛擬機中測試串口通信用谷歌的一個開源項目:android_serialport_api
5.在虛擬機中運行項目。
說明:運行前要獲取設備的許可權
1)在cmd中用adb shell命令,進入虛擬機命令行環境。

2)打開dev文件夾:cd dev
3)獲取許可權:chmod 777 ttyS2

6.谷歌的開源項目不能導入進eclipse,我整理了一下,調通了。

Ⅵ android如何讀取串口數據

樓主問題解決了沒?我用串口調試助手調試,安卓端能發送數據到pc端接收,但反過來pc端發數據過來安卓無法接收,求大神指導啊

Ⅶ 我想用Android手機與單片機進行串口通信,從而可以控制單片機,該如何實現呢

不過你還得注意的是手機的USB轉串口電平是TTL電平,所以你的單片機板子的串口也得是TTL,在就是分清楚交叉連接或者直連。

Ⅷ 誰有沒有Android串口的使用例子

1 首先做的是創建新的工程然後添加一下文件


3代碼

好了 然後就是關於這個頁面的Code了,

這是我的:

package android.serialport;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.BreakIterator;
import java.util.ServiceConfigurationError;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MyserialActivity extendsActivity
{
EditText sendedit;
EditText receiveedit;
FileInputStream mInStream;
FileOutputStream mOutStream;
SerialPort classserialport;
ReadThread mReadThread;

private class ReadThread extends Thread
{
public void run()
{
super.run();
while(!isInterrupted())
{
int size;
}
}
}


void onDataReceive(final byte[] buffer,finalint size)
{
runOnUiThread(new Runnable()
{

@Override
publicvoid run()
{
// TODO Auto-generated method stub
if(mReadThread != null)
{
receiveedit.append(newString(buffer,0,size));
}
}
});
}
@Override
protectedvoid onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_myserial);

sendedit= (EditText)findViewById(R.id.editText1);
receiveedit=(EditText)findViewById(R.id.editText2);


receiveedit.setFocusable(false);//進制輸入
/*
* 打開串口
* */
finalButton openserial =(Button)findViewById(R.id.button1);
openserial.setOnClickListener(newView.OnClickListener()
{

@Override
publicvoid onClick(View arg0)
{
//TODO Auto-generated method stub
try
{
classserialport=new SerialPort(new File("/dev/ttyS2"),9600);
}catch(SecurityExceptione)
{
e.printStackTrace();
}
catch(IOExceptione)
{
e.printStackTrace();
}
mInStream=(FileInputStream) classserialport.getInputStream();
Toast.makeText(MyserialActivity.this,"串口打開成功",Toast.LENGTH_SHORT).show();
}
});
/*
* 發送數據
* */
finalButton sendButton =(Button)findViewById(R.id.button2);
sendButton.setOnClickListener(newView.OnClickListener()
{

@Override
publicvoid onClick(View arg0)
{

Stringindata;
indata=sendedit.getText().toString();
//TODO Auto-generated method stub
try
{
mOutStream=(FileOutputStream) classserialport.getOutputStream();
mOutStream.write(indata.getBytes());
mOutStream.write(' ');
}
catch(IOExceptione)
{
e.printStackTrace();
}
Toast.makeText(MyserialActivity.this,"數據發送成功",Toast.LENGTH_SHORT).show();
sendedit.setText("");
}
});
/*
* 接收數據
* */
finalButton receButton= (Button)findViewById(R.id.button3);
receButton.setOnClickListener(newView.OnClickListener()
{//inttag =0;

@Override
publicvoid onClick(View arg0)
{
// TODO Auto-generated method stub
intsize;
try
{
byte[]buffer = new byte[64];
if(mInStream== null) return;
size= mInStream.read(buffer);
if(size>0)
{
receiveedit.setText("");

}
if(size>0)
{
onDataReceive(buffer,size);
}
inttag =1;

receiveedit.setText(newString(buffer, 0, size));

}catch(IOExceptione)
{
e.printStackTrace();
return;
}
}

privateboolean isInterrupted()
{
// TODO Auto-generated methodstub
returnfalse;
}
});
/*
* 清楚接收區
* */
finalButton ClearButton = (Button)findViewById(R.id.clear);
ClearButton.setOnClickListener(newView.OnClickListener()
{

@Override
publicvoid onClick(View arg0)
{
//TODO Auto-generated method stub
receiveedit.setText("");
}
});}

@Override
publicboolean onCreateOptionsMenu(Menu menu)
{
//Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.myserial,menu);
returntrue;
}

}

好吧 你做好了。

3需要載入的文件

下面我把所需要添加的代碼貼一貼

第一個是Serialport.java

/*
* Copyright 2009 Cedric Priscal
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

package android.serialport;

import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import android.util.Log;

public class SerialPort {

private static final String TAG = "SerialPort";

/*
* Do not remove or rename the field mFd: it is used by native method close();
*/
private FileDescriptor mFd; //創建一個文件描述符對象 mFd
private FileInputStream mFileInputStream;
private FileOutputStream mFileOutputStream;

public SerialPort(File device, int baudrate) throws SecurityException, IOException {
/*
* 檢查訪問許可權
* */
/* Check access permission */
if (!device.canRead() || !device.canWrite()) {//如果設備不可讀或者設備不可寫
try {
/* Missing read/write permission, trying to chmod the file *///沒有讀寫許可權,就嘗試去掛載許可權
Process su; //流程進程 su
su = Runtime.getRuntime().exec("/system/bin/su");//通過執行掛載到/system/bin/su 獲得執行
String cmd = "chmod 777 " + device.getAbsolutePath() + " "
+ "exit ";
/*String cmd = "chmod 777 /dev/s3c_serial0" + " "
+ "exit ";*/
su.getOutputStream().write(cmd.getBytes());//進程。獲得輸出流。寫(命令。獲得二進制)
if ((su.waitFor() != 0) || !device.canRead()
|| !device.canWrite()) {//如果 進程等待不是0 或者 設備不能讀寫就
throw new SecurityException();//拋出一個許可權異常
}
} catch (Exception e) {
e.printStackTrace();
throw new SecurityException();
}
}
/*
*
* */
mFd = open(device.getAbsolutePath(), baudrate);
//device.getAbsolutePath()這是要掛載的路徑new File("/dev/ttyS2")
if (mFd == null) {
Log.e(TAG, "native open returns null");
throw new IOException();//輸入輸出異常
}
//將文件描述符 做輸入輸出流的參數 傳遞給創建的輸入輸出流
mFileInputStream = new FileInputStream(mFd);
mFileOutputStream = new FileOutputStream(mFd);
}

// Getters and setters
public InputStream getInputStream() {
return mFileInputStream;
}

public OutputStream getOutputStream() {
return mFileOutputStream;
}

// JNI
private native static FileDescriptor open(String path, int baudrate);
public native void close();
static {
System.loadLibrary("serial_port");
}
}

第二個是SerialPortFinder.java

/*
* Copyright 2009 Cedric Priscal
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

package android.serialport;

import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.LineNumberReader;
import java.util.Iterator;
import java.util.Vector;

import android.util.Log;

public class SerialPortFinder {

/*
* 創建一個驅動程序類
* */
public class Driver {
public Driver(String name, String root) {
mDriverName = name;//String 類型的
mDeviceRoot = root;
}
private String mDriverName;
private String mDeviceRoot;
Vector<File> mDevices = null;
/*
* Vector 類在 java 中可以實現自動增長的對象數組
* 簡單的使用方法如下:
vector<int> test;//建立一個vector
test.push_back(1);
test.push_back(2);//把1和2壓入vector這樣test[0]就是1,test[1]就是2
* */
public Vector<File> getDevices() {
if (mDevices == null) {
mDevices = new Vector<File>();
File dev = new File("/dev");
File[] files = dev.listFiles();
int i;
for (i=0; i<files.length; i++) {
if (files[i].getAbsolutePath().startsWith(mDeviceRoot)) {
Log.d(TAG, "Found new device: " + files[i]);
mDevices.add(files[i]);
}
}
}
return mDevices;
}

public String getName() {
return mDriverName;
}
}
/*
*
*
* */
private static final String TAG = "SerialPort";

private Vector<Driver> mDrivers = null;

Vector<Driver> getDrivers() throws IOException {
if (mDrivers == null) {
mDrivers = new Vector<Driver>();
LineNumberReader r = new LineNumberReader(new FileReader("/proc/tty/drivers"));
String l;
while((l = r.readLine()) != null) {
String[] w = l.split(" +");
if ((w.length == 5) && (w[4].equals("serial"))) {
Log.d(TAG, "Found new driver: " + w[1]);
mDrivers.add(new Driver(w[0], w[1]));
}
}
r.close();
}
return mDrivers;
}

public String[] getAllDevices() {
Vector<String> devices = new Vector<String>();
// Parse each driver
Iterator<Driver> itdriv;
try {
itdriv = getDrivers().iterator();
while(itdriv.hasNext()) {
Driver driver = itdriv.next();
Iterator<File> itdev = driver.getDevices().iterator();
while(itdev.hasNext()) {
String device = itdev.next().getName();
String value = String.format("%s (%s)", device, driver.getName());
devices.add(value);
}
}
} catch (IOException e) {
e.printStackTrace();
}
return devices.toArray(new String[devices.size()]);
}

public String[] getAllDevicesPath() {
Vector<String> devices = new Vector<String>();
// Parse each driver
Iterator<Driver> itdriv;
try {
itdriv = getDrivers().iterator();
while(itdriv.hasNext()) {
Driver driver = itdriv.next();
Iterator<File> itdev = driver.getDevices().iterator();
while(itdev.hasNext()) {
String device = itdev.next().getAbsolutePath();
devices.add(device);
}
}
} catch (IOException e) {
e.printStackTrace();
}
return devices.toArray(new String[devices.size()]);
}
}

第三個是Android.mk

#
# Copyright 2009 Cedric Priscal
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

TARGET_PLATFORM := android-3
LOCAL_MODULE := serial_port
LOCAL_SRC_FILES := SerialPort.c
LOCAL_LDLIBS := -llog

include $(BUILD_SHARED_LIBRARY)

第四個是SerialPort.c

/*
* Copyright 2009 Cedric Priscal
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

#include <termios.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <jni.h>

#include "android/log.h"
static const char *TAG="serial_port";
#define LOGI(fmt, args...) __android_log_print(ANDROID_LOG_INFO, TAG, fmt, ##args)
#define LOGD(fmt, args...) __android_log_print(ANDROID_LOG_DEBUG, TAG, fmt, ##args)
#define LOGE(fmt, args...) __android_log_print(ANDROID_LOG_ERROR, TAG, fmt, ##args)

static speed_t getBaudrate(jint baudrate)
{
switch(baudrate) {
case 0: return B0;
case 50: return B50;
case 75: return B75;
case 110: return B110;
case 134: return B134;
case 150: return B150;
case 200: return B200;
case 300: return B300;
case 600: return B600;
case 1200: return B1200;
case 1800: return B1800;
case 2400: return B2400;
case 4800: return B4800;
case 9600: return B9600;
case 19200: return B19200;
case 38400: return B38400;
case 57600: return B57600;
case 115200: return B115200;
case 230400: return B230400;
case 460800: return B460800;
case 500000: return B500000;
case 576000: return B576000;
case 921600: return B921600;
case 1000000: return B1000000;
case 1152000: return B1152000;
case 1500000: return B1500000;
case 2000000: return B2000000;
case 2500000: return B2500000;
case 3000000: return B3000000;
case 3500000: return B3500000;
case 4000000: return B4000000;
default: return -1;
}
}

/*
* Class: cedric_serial_SerialPort
* Method: open
* Signature: (Ljava/lang/String;)V
*/
JNIEXPORT jobject JNICALL Java_android_serialport_SerialPort_open
(JNIEnv *env, jobject thiz, jstring path, jint baudrate)
{
int fd;
speed_t speed;
jobject mFileDescriptor;

/* Check arguments */
{
speed = getBaudrate(baudrate);
if (speed == -1) {
/* TODO: throw an exception */
LOGE("Invalid baudrate");
return NULL;
}
}

/* Opening device */
{
jboolean is;
const char *path_utf = (*env)->GetStringUTFChars(env, path, &is);
LOGD("Opening serial port %s", path_utf);
fd = open(path_utf, O_RDWR | O_DIRECT | O_SYNC);
LOGD("open() fd = %d", fd);
(*env)->ReleaseStringUTFChars(env, path, path_utf);
if (fd == -1)
{
/* Throw an exception */
LOGE("Cannot open port");
/* TODO: throw an exception */
return NULL;
}
}

/* Configure device */
{
struct termios cfg;
LOGD("Configuring serial port");
if (tcgetattr(fd, &cfg))
{
LOGE("tcgetattr() failed");
close(fd);
/* TODO: throw an exception */
return NULL;
}

cfmakeraw(&cfg);
cfsetispeed(&cfg, speed);
cfsetospeed(&cfg, speed);

if (tcsetattr(fd, TCSANOW, &cfg))
{
LOGE("tcsetattr() failed");
close(fd);
/* TODO: throw an exception */
return NULL;
}
}

/* Create a corresponding file descriptor */
{
jclass cFileDescriptor = (*env)->FindClass(env, "java/io/FileDescriptor");
jmethodID iFileDescriptor = (*env)->GetMethodID(env, cFileDescriptor, "<init>", "()V");
jfieldID descriptorID = (*env)->GetFieldID(env, cFileDescriptor, "descriptor", "I");
mFileDescriptor = (*env)->NewObject(env, cFileDescriptor, iFileDescriptor);
(*env)->SetIntField(env, mFileDescriptor, descriptorID, (jint)fd);
}

return mFileDescriptor;
}

/*
* Class: cedric_serial_SerialPort
* Method: close
* Signature: ()V
*/
JNIEXPORT void JNICALL Java_android_serialport_SerialPort_close
(JNIEnv *env, jobject thiz)
{
jclass SerialPortClass = (*env)->GetObjectClass(env, thiz);
jclass FileDescriptorClass = (*env)->FindClass(env, "java/io/FileDescriptor");

jfieldID mFdID = (*env)->GetFieldID(env, SerialPortClass, "mFd", "Ljava/io/FileDescriptor;");
jfieldID descriptorID = (*env)->GetFieldID(env, FileDescriptorClass, "descriptor", "I");

jobject mFd = (*env)->GetObjectField(env, thiz, mFdID);
jint descriptor = (*env)->GetIntField(env, mFd, descriptorID);

LOGD("close(fd = %d)", descriptor);
close(descriptor);
}

Ⅸ Android平台的串口通信技術

如下表不同操作系統的串口地址,Android是基於Linux的所以一般情況下使用Android系統的設備串口地址為/dev/ttyS0...

Ⅹ Android UART 串口通信

最近有項目需要實現windows機器和Android開發版進行UART串口通信,經過3天查找嘗試,特記錄一下最終方案,希望之後的同行少走彎路,最後在git上回開源我最終的方案希望大家支持。

Android 3.0.1
Gradle 4.1
ARM開發版 : RK3399
PC機器:Win10
開發機器:MAC 10.13.3

先上圖

由於 android-serialport-api 項目中的so使用較old的ndk編譯,所以在對於Android 6.0 以上版本兼容的時候會報錯 dlopen failed: "has text relocations" 。且使用的mk進行編譯,特升級為用cmake編譯。

升級 android-serialport-api

項目結構:

app對應原項目中的各個Activity, androidserial 是mole 對應編譯之前的so,還有API的封裝。可以直接引用androidserial,調用方法參考app目錄下的activity。

注意 關於許可權!

當接入開發板後如果發現 Error You do not have read/write permission to the serial port 需要root 許可權 ,在開發者模式中開啟root 許可權 adb和應用

使用一下命令開啟Android對串口的讀寫許可權

setenforce 0 : 關閉防火牆,有人說關鍵是這,但是我的環境不用關閉,只要給許可權就可以

注意 關於ttyS1 - 6 ttyS1 - 6 對應的是 UART 串口1-6 一般都是一一對應的。這個具體要看一下開發板的說明。

記錄的比較糙,還請見諒,如有問題請留言,我看到後肯定回復。項目主要看結構,剩下的都是復制黏貼的事。 git地址:https://github.com/braincs/AndroidSerialLibrary

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