1.模擬器可以使用PC的串口
啓動模擬器並加載PC串口 命令如下：
運行 emulator @模擬器名稱 -qemu -serial COM1
2.查看串口是否被加載
啓動後使用 adb shell 命令打開命令行
cd dev 查看會發現ttyS0 ttyS1 ttyS2,其他ttyS2 就是我們加載上來的串口COM1
3.修改權限
chmod 777 ttyS2
現在我們可以開發串口程序了。
4.串口程序實例
下載libserial_port.so ，放入libs/armeabi 目錄，可以自己創建此目錄
libserial_port.so 下載地址：
http://code.google.com/p/android-serialport-api/
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";
private FileDescriptor mFd;
private FileInputStream mFileInputStream;
private FileOutputStream mFileOutputStream;
public SerialPort(File device, int baudrate) throws SecurityException, IOException {
if (!device.canRead() || !device.canWrite()) {
try {
Process su;
su = Runtime.getRuntime().exec("/system/bin/su");
String cmd = "chmod 666 " + device.getAbsolutePath() + "\n"
+ "exit\n";
su.getOutputStream().write(cmd.getBytes());
if ((su.waitFor() != 0) || !device.canRead()
|| !device.canWrite()) {
throw new SecurityException();
}
} catch (Exception e) {
e.printStackTrace();
throw new SecurityException();
}
}
mFd = open(device.getAbsolutePath(), baudrate);
if (mFd == null) {
Log.e(TAG, "native open returns null");
throw new IOException();
}
mFileInputStream = new FileInputStream(mFd);
mFileOutputStream = new FileOutputStream(mFd);
}
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");
}
}
####################################
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
* LINUX下串口打印接口
* @author douk
*
*/
public class PrintClass {
//輸入流
private static InputStream in;
//輸出流
private static OutputStream out;
private static final String PORT = "/dev/ttyS2";//串口
private SerialPort serialPort;
/**
* 連接串口
*/
private void Connect()
{
try {
serialPort = new SerialPort(new File(PORT), 38400);
in = serialPort.getInputStream();
out = serialPort.getOutputStream();
} catch (SecurityException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 關閉串口
* @throws IOException
*/
public void CloseSerialPort()
{
try {
out.close();
in.close();
serialPort.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
啓動模擬器並加載PC串口 命令如下：
運行 emulator @模擬器名稱 -qemu -serial COM1
2.查看串口是否被加載
啓動後使用 adb shell 命令打開命令行
cd dev 查看會發現ttyS0 ttyS1 ttyS2,其他ttyS2 就是我們加載上來的串口COM1
3.修改權限
chmod 777 ttyS2
現在我們可以開發串口程序了。
4.串口程序實例
下載libserial_port.so ，放入libs/armeabi 目錄，可以自己創建此目錄
libserial_port.so 下載地址：
http://code.google.com/p/android-serialport-api/
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";
private FileDescriptor mFd;
private FileInputStream mFileInputStream;
private FileOutputStream mFileOutputStream;
public SerialPort(File device, int baudrate) throws SecurityException, IOException {
if (!device.canRead() || !device.canWrite()) {
try {
Process su;
su = Runtime.getRuntime().exec("/system/bin/su");
String cmd = "chmod 666 " + device.getAbsolutePath() + "\n"
+ "exit\n";
su.getOutputStream().write(cmd.getBytes());
if ((su.waitFor() != 0) || !device.canRead()
|| !device.canWrite()) {
throw new SecurityException();
}
} catch (Exception e) {
e.printStackTrace();
throw new SecurityException();
}
}
mFd = open(device.getAbsolutePath(), baudrate);
if (mFd == null) {
Log.e(TAG, "native open returns null");
throw new IOException();
}
mFileInputStream = new FileInputStream(mFd);
mFileOutputStream = new FileOutputStream(mFd);
}
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");
}
}
####################################
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
* LINUX下串口打印接口
* @author douk
*
*/
public class PrintClass {
//輸入流
private static InputStream in;
//輸出流
private static OutputStream out;
private static final String PORT = "/dev/ttyS2";//串口
private SerialPort serialPort;
/**
* 連接串口
*/
private void Connect()
{
try {
serialPort = new SerialPort(new File(PORT), 38400);
in = serialPort.getInputStream();
out = serialPort.getOutputStream();
} catch (SecurityException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 關閉串口
* @throws IOException
*/
public void CloseSerialPort()
{
try {
out.close();
in.close();
serialPort.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
