手机接收蓝牙数据画图
控件界面
package com.testBlueTooth;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;
import android.widget.ToggleButton;
public class testBlueTooth extends Activity {
static final String SPP_UUID = "00001101-0000-1000-8000-00805F9B34FB";
Button btnSearch, btnDis, btnExit;
ToggleButton tbtnSwitch;
ListView lvBTDevices;
ArrayAdapter<String> adtDevices;
List<String> lstDevices = new ArrayList<String>();
BluetoothAdapter btAdapt;
public static BluetoothSocket btSocket;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Button 设置
btnSearch = (Button) this.findViewById(R.id.btnSearch);
btnSearch.setOnClickListener(new ClickEvent());
btnExit = (Button) this.findViewById(R.id.btnExit);
btnExit.setOnClickListener(new ClickEvent());
btnDis = (Button) this.findViewById(R.id.btnDis);
btnDis.setOnClickListener(new ClickEvent());
// ToogleButton设置
tbtnSwitch = (ToggleButton) this.findViewById(R.id.tbtnSwitch);
tbtnSwitch.setOnClickListener(new ClickEvent());
// ListView及其数据源 适配器
lvBTDevices = (ListView) this.findViewById(R.id.lvDevices);
adtDevices = new ArrayAdapter<String>(testBlueTooth.this,
android.R.layout.simple_list_item_1, lstDevices);
lvBTDevices.setAdapter(adtDevices);
lvBTDevices.setOnItemClickListener(new ItemClickEvent());
btAdapt = BluetoothAdapter.getDefaultAdapter();// 初始化本机蓝牙功能
if(btAdapt != null){
if (btAdapt.getState() == BluetoothAdapter.STATE_OFF)// 读取蓝牙状态并显示
tbtnSwitch.setChecked(false);
else if (btAdapt.getState() == BluetoothAdapter.STATE_ON)
tbtnSwitch.setChecked(true);
}
// 注册Receiver来获取蓝牙设备相关的结果
IntentFilter intent = new IntentFilter();
intent.addAction(BluetoothDevice.ACTION_FOUND);// 用BroadcastReceiver来取得搜索结果
intent.addAction(BluetoothDevice.ACTION_BOND_STATE_CHANGED);
intent.addAction(BluetoothAdapter.ACTION_SCAN_MODE_CHANGED);
intent.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);
registerReceiver(searchDevices, intent);
}
private BroadcastReceiver searchDevices = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
Bundle b = intent.getExtras();
Object[] lstName = b.keySet().toArray();
// 显示所有收到的消息及其细节
for (int i = 0; i < lstName.length; i++) {
String keyName = lstName[i].toString();
Log.e(keyName, String.valueOf(b.get(keyName)));
}
//搜索设备时，取得设备的MAC地址
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
BluetoothDevice device = intent
.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
String str= device.getName() + "|" + device.getAddress();
if (lstDevices.indexOf(str) == -1)// 防止重复添加
lstDevices.add(str); // 获取设备名称和mac地址
adtDevices.notifyDataSetChanged();
}
}
};
@Override
protected void onDestroy() {
this.unregisterReceiver(searchDevices);
super.onDestroy();
android.os.Process.killProcess(android.os.Process.myPid());
}
class ItemClickEvent implements AdapterView.OnItemClickListener {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
btAdapt.cancelDiscovery();
String str = lstDevices.get(arg2);
String[] values = str.split("\\|");
String address=values[1];
Log.e("address",values[1]);
UUID uuid = UUID.fromString(SPP_UUID);
BluetoothDevice btDev = btAdapt.getRemoteDevice(address);
try {
btSocket = btDev
.createRfcommSocketToServiceRecord(uuid);
btSocket.connect();
//打开波形图实例
Intent intent = new Intent();
intent.setClass(testBlueTooth.this, WaveDiagram.class);
startActivity(intent);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
class ClickEvent implements View.OnClickListener {
@Override
public void onClick(View v) {
if (v == btnSearch)// 搜索蓝牙设备，在BroadcastReceiver显示结果
{
if (btAdapt.getState() == BluetoothAdapter.STATE_OFF) {// 如果蓝牙还没开启
Toast.makeText(testBlueTooth.this, "请先打开蓝牙", 1000).show();
return;
}
setTitle("本机蓝牙地址：" + btAdapt.getAddress());
lstDevices.clear();
btAdapt.startDiscovery();
} else if (v == tbtnSwitch) {// 本机蓝牙启动/关闭
if (tbtnSwitch.isChecked() == false)
btAdapt.enable();
else if (tbtnSwitch.isChecked() == true)
btAdapt.disable();
} else if (v == btnDis)// 本机可以被搜索
{
Intent discoverableIntent = new Intent(
BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
discoverableIntent.putExtra(
BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);
startActivity(discoverableIntent);
} else if (v == btnExit) {
try {
if (btSocket != null)
btSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
testBlueTooth.this.finish();
}
}
}
}
2.显示界面
package com.testBlueTooth;
import java.io.IOException;
import java.io.InputStream;
import android.app.Activity;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnTouchListener;
public class WaveDiagram extends Activity {
ClsWaveDiagram clsWaveDiagram;
SurfaceView sfvWave;
Paint mPaint;
InputStream btInput;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.wavediagram);
sfvWave = (SurfaceView) this.findViewById(R.id.sfvWave);
sfvWave.setOnTouchListener(new TouchEvent());
mPaint = new Paint();
mPaint.setColor(Color.GREEN);// 画笔为绿色
mPaint.setStrokeWidth(2);// 设置画笔粗细
try {
if (testBlueTooth.btSocket.getInputStream() != null) {
clsWaveDiagram = new ClsWaveDiagram(
testBlueTooth.btSocket.getInputStream(),
3,
1,
sfvWave.getWidth()/2);//横向绘制波形图
clsWaveDiagram.Start(sfvWave, mPaint,80);
Log.e("clsWaveDiagram","start");
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public void onDestroy()
{
clsWaveDiagram.Stop();
try {
testBlueTooth.btSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
super.onDestroy();
}
class TouchEvent implements OnTouchListener {
@Override
public boolean onTouch(View v, MotionEvent event) {
clsWaveDiagram.baseLine = (int) event.getX();
return true;
}
}
}
画图方法
package com.testBlueTooth;
import java.io.InputStream;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.Log;
import android.view.SurfaceView;
public class ClsWaveDiagram {
private boolean isRecording = false;// 线程控制标记
private InputStream btInput = null;// 蓝牙数据输入流
/**
* X轴缩小的比例
*/
public int rateX = 1;
/**
* Y轴缩小的比例
*/
public int rateY = 1;
/**
* Y轴基线
*/
public int baseLine = 0;
/**
* 初始化
*/
public ClsWaveDiagram(InputStream btInput, int rateX, int rateY,
int baseLine) {
this.btInput = btInput;
this.rateX = rateX;
this.rateY = rateY;
this.baseLine = baseLine;
}
/**
* 开始
*
* @param recBufSize
* AudioRecord的MinBufferSize
*/
public void Start(SurfaceView sfv, Paint mPaint, int wait) {
isRecording = true;
new DrawThread(sfv, mPaint, wait).start();// 开始绘制线程
}
/**
* 停止
*/
public void Stop() {
isRecording = false;
}
/**
* 负责绘制inBuf中的数据
*
* @author GV
*
*/
class DrawThread extends Thread {
private int oldX = 0;// 上次绘制的X坐标
private int oldY = 0;// 上次绘制的Y坐标
private SurfaceView sfv;// 画板
private int X_index = 0;// 当前画图所在屏幕X轴的坐标
private Paint mPaint;// 画笔
private int wait = 50;// 线程等待时间
public DrawThread(SurfaceView sfv, Paint mPaint, int wait) {
this.sfv = sfv;
this.mPaint = mPaint;
this.wait = wait;
}
public void run() {
while (isRecording) {
try {
byte[] temp = new byte[1024];
int len = btInput.read(temp);
Log.e("available", String.valueOf(len));
if (len > 0) {
byte[] btBuf = new byte[len];
System.arraycopy(temp, 0, btBuf, 0, btBuf.length);
SimpleDraw(X_index, btBuf, rateX, rateY, baseLine);// 把缓冲区数据画出来
X_index = X_index + (btBuf.length/rateX) - 1;// 这里-1可以减少空隙
if (X_index > sfv.getHeight()) {
X_index = 0;
}
}
Thread.sleep(wait);// 延时一定时间缓冲数据
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
/**
* 绘制指定区域
*
* @param start
* X轴开始的位置(全屏)
* @param inputBuf
* 缓冲区
* @param rateX
* X轴数据缩小的比例
* @param rateY
* Y轴数据缩小的比例
* @param baseLine
* Y轴基线
*/
void SimpleDraw(int start, byte[] inputBuf, int rateX, int rateY,
int baseLine) {
if (start == 0)
oldX = 0;
// 根据需要缩小X轴比例
byte[] buffer = new byte[inputBuf.length / rateX];
for (int i = 0, ii = 0; i < buffer.length; i++, ii = i * rateX)
buffer[i] = inputBuf[ii];
Canvas canvas = sfv.getHolder().lockCanvas(
new Rect(0, start, sfv.getWidth(), start + buffer.length));// 关键:获取画布
canvas.drawColor(Color.BLACK);// 清除背景
for (int i = 0; i < buffer.length; i++) {// 有多少画多少
int y = i + start;
int x = (0xFF - (buffer[i] & 0xFF))// 0xFF- 用于翻转，
// &0xFF用把byte类型的负数取值转为正
/ rateY + baseLine;// 调节缩小比例，调节基准线
canvas.drawLine(oldX, oldY, x, y, mPaint);
oldX = x;
oldY = y;
}
sfv.getHolder().unlockCanvasAndPost(canvas);// 解锁画布，提交画好的图像
}
}
}
布局
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <LinearLayout android:id="@+id/LinearLayout01" android:layout_width="wrap_content" android:layout_height="wrap_content"> <TextView android:id="@+id/TextView01" android:layout_height="wrap_content" android:text="手机蓝牙开关" android:layout_width="100dip"></TextView><ToggleButton android:layout_height="wrap_content" android:text="蓝牙开关" android:layout_width="wrap_content" android:id="@+id/tbtnSwitch"></ToggleButton> <Button android:layout_height="wrap_content" android:text="本机蓝牙可见" android:id="@+id/btnDis" android:layout_width="160dip"></Button></LinearLayout> <LinearLayout android:id="@+id/LinearLayout02" android:layout_width="wrap_content" android:layout_height="wrap_content"> <Button android:layout_height="wrap_content" android:id="@+id/btnSearch" android:text="搜索设备" android:layout_width="160dip"></Button> <Button android:layout_height="wrap_content" android:id="@+id/btnExit" android:text="退出程序" android:layout_width="160dip"></Button> </LinearLayout> <ListView android:layout_width="fill_parent" android:id="@+id/lvDevices" android:layout_height="fill_parent"> </ListView> </LinearLayout>
<?xml version="1.0" encoding="UTF-8"?> <LinearLayout android:id="@+id/LinearLayout01" android:layout_width="fill_parent" android:layout_height="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android"> <SurfaceView android:layout_height="fill_parent" android:layout_width="fill_parent" android:id="@+id/sfvWave"></SurfaceView> </LinearLayout>