android开发(37) android使用android_serialport_api 操作串口，解决权限问题

    <string name="error_configuration">Please configure your serial port first.</string>
    <string name="error_security">You do not have read/write permission to the serial
        port.</string>
    <string name="error_unknown">The serial port can not be opened for an unknown
        reason.</string>

    <application
        android:allowBackup="true"
        android:name="android_serialport_api.Application"
        android:theme="@style/AppTheme" >

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:keepScreenOn="true"
    android:orientation="vertical" >

    <EditText
        android:id="@+id/EditTextReception"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_weight="7"
        android:gravity="top"
        android:hint="Reception"
        android:isScrollContainer="true"
        android:scrollbarStyle="insideOverlay" >
    </EditText>

    <EditText
        android:id="@+id/EditTextEmission"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:hint="Emission"
        android:lines="4"
        android:text="" >
    </EditText>

    <Button
        android:id="@+id/btnSend"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="Send" />

</LinearLayout>

/*
 * 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 zyf.serialportdemo;

import java.io.IOException;

import zyf.serialportdemo.R;

import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.TextView.OnEditorActionListener;
import android_serialport_api.SerialPortActivity;

public class ConsoleActivity extends SerialPortActivity {
    Button btnSend;
    EditText mReception;
    EditText mEmission;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.console);

//        setTitle("Loopback test");
        mReception = (EditText) findViewById(R.id.EditTextReception);

        mEmission = (EditText) findViewById(R.id.EditTextEmission);
        
        btnSend = (Button)findViewById(R.id.btnSend);
        btnSend.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                String text = mEmission.getText().toString();
                try {
                    mOutputStream.write(new String(text).getBytes());
                    mOutputStream.write(‘\n‘);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        });
        //发送指令到斑马打印机
        mEmission.setText("^XA^A0N,40,30^FO50,150^FDHELLO WORLD^FS^XZ");
　　　　/*二维码指令

　　　　　　^XA
　　　　　　^PMY
　　　　　　^FO200,200^BQ,2,10
　　　　　　^FDD03040C,LA,012345678912AABBqrcode^FS
　　　　　　^XZ

　　　　*/
    }

    @Override
    protected void onDataReceived(final byte[] buffer, final int size) {
        runOnUiThread(new Runnable() {
            public void run() {
                if (mReception != null) {
                    mReception.append(new String(buffer, 0, size));
                }
            }
        });
    }
}

/*
 * 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;

import java.io.File;
import java.io.IOException;
import java.security.InvalidParameterException;



import android.content.SharedPreferences;

public class Application extends android.app.Application {

    public SerialPortFinder mSerialPortFinder = new SerialPortFinder();
    private SerialPort mSerialPort = null;

    public SerialPort getSerialPort() throws SecurityException, IOException, InvalidParameterException {
        if (mSerialPort == null) {
            /* Read serial port parameters */
            //SharedPreferences sp = getSharedPreferences("android_serialport_api.sample_preferences", MODE_PRIVATE);
            //String path = sp.getString("DEVICE", "");
            //String path = "ttyS2";
            String path = "/dev/ttyS2";//指定端口
            //int baudrate = Integer.decode(sp.getString("BAUDRATE", "-1"));
            int baudrate = 9600;//指定速率
            /* Check parameters */
            if ( (path.length() == 0) || (baudrate == -1)) {
                throw new InvalidParameterException();
            }

            /* Open the serial port */
            mSerialPort = new SerialPort(new File(path), baudrate, 0);
        }
        return mSerialPort;
    }

    public void closeSerialPort() {
        if (mSerialPort != null) {
            mSerialPort.close();
            mSerialPort = null;
        }
    }
}