在Android下建立RS232通訊應用程式心得分享

利用Android來設計硬體平台時，若您的驅動不是自己開發，而是拿廠商的軟體，在檔案放置的位置上要特別小心，在圖上有兩個檔案是由長高科技提供，所以當您在建立新專案時，請注意其目錄放置位置。以上是所撰寫的原始程式列表(粗體字的部份是長高所撰寫的JNI函式)：
package com.example.uart;

import tw.com.dmatek.dma6410xp.uart.Linuxc;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;


public class Uart_Control extends Activity {
/** Called when the activity is first created. */
public int fd=-1;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button uart1 = (Button) findViewById(R.id.uart1);
uart1.setOnClickListener(new OnClickListener(){


@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(fd > 0) Linuxc.closeUart(0);
fd=Linuxc.openUart(1);
if(fd>0)
{
setTitle("open uart1 sucess!"+String.valueOf(fd));
Linuxc.setUart(0);//1200bps
}
else
{
setTitle("open device false!"+fd);
}
}

});
Button uart2 = (Button) findViewById(R.id.uart2);
uart2.setOnClickListener(new OnClickListener(){

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(fd > 0) Linuxc.closeUart(0);
fd=Linuxc.openUart(2);
if(fd>0)
{
setTitle("open uart2 sucess!"+String.valueOf(fd));
Linuxc.setUart(0);//1200bps
}
else
{
setTitle("open device false!"+fd);
}

}

});
Button send = (Button) findViewById(R.id.send);
send.setOnClickListener(new OnClickListener(){

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Linuxc.sendMsgUart("123"); }

});
final TextView tv = (TextView) findViewById(R.id.TextView01);
Button receive = (Button) findViewById(R.id.recevice);
receive.setOnClickListener(new OnClickListener(){

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String str = Linuxc.receiveMsgUart();
tv.setText(str);
}

});
}
}