串口通信 成功 写数据 和读数据 代码 例子（个人测试正常）

可怜的程序员同胞。如果你们就是出现 可以 写数据发出去，然而安卓端不能读数据的话。有一种可能，那就是

如果是用PC模拟串口发数据，请确定你有安装正确的串口驱动。

如果是用串口设备发数据，请仔细检查下你的串口设备程序有没有正确的把数据发出来

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/*

* 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 copy 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_api.sample;

import android.app.Activity;

import android.app.AlertDialog;

import android.content.Intent;

import android.os.Bundle;

import android.text.TextUtils;

import android.util.Log;

import android.view.View;

import android.widget.Button;

import android.widget.Toast;

import java.io.BufferedReader;

import java.io.File;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.util.Arrays;

import android_serialport_api.SerialPort;

public class MainMenuextends Activity {

private final StringTAG ="打印数据";

    private OutputStreammOutputStream;

    private InputStreaminputStream;

    private ReadThreadmReadThread;

    private class ReadThreadextends Thread {

@Override

        public void run() {

super.run();

            while (!isInterrupted()) {

int size;

                try {

byte[] buffer =new byte[64];

                    if (inputStream ==null)return;

                    size =inputStream.read(buffer);

                    if (size >0) {

String result =new String(buffer, 0, size);

                        Log.e(TAG, "result=" + result);

                    }

}catch (IOException e) {

e.printStackTrace();

return;

                }

}

}

}

/**

* Called when the activity is first created.

*/

    @Override

    public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        try {

SerialPort serialPort =new SerialPort(new File("/dev/ttyS1"), 9600, 0);//your serial port dev

            mOutputStream = serialPort.getOutputStream();

            inputStream = serialPort.getInputStream();

            /*开启线程读取数据*/

/* Create a receiving thread */

            mReadThread =new ReadThread();

            mReadThread.start();

        }catch (IOException e) {

Toast.makeText(MainMenu.this, "串口设备获取失败", Toast.LENGTH_LONG).show();

            e.printStackTrace();

        }

final Button buttonWrite = (Button) findViewById(R.id.ButtonW);

        buttonWrite.setOnClickListener(new View.OnClickListener() {

@Override

            public void onClick(View v) {

byte[] mBuffer =new byte[64];

                Arrays.fill(mBuffer, (byte)0x55);

                try {

mOutputStream.write(mBuffer);

                }catch (IOException e) {

e.printStackTrace();

                }

}

});

        final Button buttonAbout = (Button) findViewById(R.id.ButtonAbout);

        buttonAbout.setOnClickListener(new View.OnClickListener() {

public void onClick(View v) {

AlertDialog.Builder builder =new AlertDialog.Builder(MainMenu.this);

                builder.setTitle("About");

                builder.setMessage(R.string.about_msg);

                builder.show();

            }

});

        final Button buttonQuit = (Button) findViewById(R.id.ButtonQuit);

        buttonQuit.setOnClickListener(new View.OnClickListener() {

public void onClick(View v) {

MainMenu.this.finish();

            }

});

    }

}