Android蓝牙操作：与蓝牙串口模块通信，或其他蓝牙设备通信。
初涉android的蓝牙操作,按照固定MAC地址连接获取Device时，程序始终是异常终止，查了好多天代码都没查出原因。今天改了一下API版本，突然就成功连接了。总结之后发现果然是个坑爹之极的错误。
为了这种错误拼命查原因浪费大把时间是非常不值得的，但是问题不解决更是揪心。可惜我百度了那么多，都没有给出确切原因。今天特此mark，希望后来者遇到这个问题的时候能轻松解决。
下面是我的连接过程，中间崩溃原因及解决办法。
1：用AT指令获得蓝牙串口的MAC地址，地址是简写的，按照常理猜测可得标准格式。
2：开一个String adress= "************" //MAC地址， String MY_UUID= "************"//UUID根据通信而定，网上都有。
3：取得本地Adapter用getDefaultAdapter(); 远程的则用getRemoteDevice(adress)； 之后便可用UUID开socket进行通信。
如果中途各种在getRemoteDevice处崩溃，大家可以查看一下当前的API版本，如果是2.1或以下版本的话，便能确定是API版本问题，只要换成2.2或者以上就都可以正常运行了~ 这么坑爹的错误的确很为难初学者。 唉·········· 为这种小trick浪费很多时间真是难过。
（另外有个重要地方，别忘了给manifest里面加以下两个蓝牙操作权限哦~）
<uses-permission android:name="android.permission.BLUETOOTH"></uses-permission>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"></uses-permission>
下面附上Android蓝牙操作中用固定MAC地址传输信息的模板，通用搜索模式日后再补删模板：
private BluetoothAdapter mBluetoothAdapter = null;
private BluetoothSocket btSocket = null;
private OutputStream outStream = null;
private InputStream inStream = null;
private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); //这条是蓝牙串口通用的UUID，不要更改
private static String address = "00:12:02:22:06:61"; // <==要连接的蓝牙设备MAC地址
/*获得通信线路过程*/
/*1:获取本地BlueToothAdapter*/
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if(mBluetoothAdapter == null)
{
Toast.makeText(this, "Bluetooth is not available.", Toast.LENGTH_LONG).show();
finish();
return;
}
if(!mBluetoothAdapter.isEnabled())
{
Toast.makeText(this, "Please enable your Bluetooth and re-run this program.", Toast.LENGTH_LONG).show();
finish();
return;
}
/*2:获取远程BlueToothDevice*/
BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
if(mBluetoothAdapter == null)
{
Toast.makeText(this, "Can't get remote device.", Toast.LENGTH_LONG).show();
finish();
return;
}
/*3:获得Socket*/
try {
btSocket = device.createRfcommSocketToServiceRecord(MY_UUID);
} catch (IOException e) {
Log.e(TAG, "ON RESUME: Socket creation failed.", e);
}
/*4:取消discovered节省资源*/
mBluetoothAdapter.cancelDiscovery();
/*5:连接*/
try {
btSocket.connect();
Log.e(TAG, "ON RESUME: BT connection established, data transfer link open.");
} catch (IOException e) {
try {
btSocket.close();
} catch (IOException e2) {
Log .e(TAG,"ON RESUME: Unable to close socket during connection failure", e2);
}
}
/*此时可以通信了，放在任意函数中*/
/* try {
outStream = btSocket.getOutputStream();
inStream = btSocket.getInputStream(); //可在TextView里显示
} catch (IOException e) {
Log.e(TAG, "ON RESUME: Output stream creation failed.", e);
}
String message = "1";
byte[] msgBuffer = message.getBytes();
try {
outStream.write(msgBuffer);
} catch (IOException e) {
Log.e(TAG, "ON RESUME: Exception during write.", e);
}
*/
通用搜索模式代码模板：
简洁简洁方式1 demo
作用： 用VerticalSeekBar控制一个 LED屏幕的亮暗。
直接上码咯~
package com.example.seed2;
import .Activity;
import .AlertDialog;
import .Dialog;
import android.os.Bundle;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.UUID;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.DialogInterface;
import android.util.Log;
import android.view.KeyEvent;
import android.widget.Toast;
public class MetalSeed extends Activity {
private static final String TAG = "BluetoothTest";
private BluetoothAdapter mBluetoothAdapter = null;
private BluetoothSocket btSocket = null;
private OutputStream outStream = null;
private InputStream inStream = null;
private VerticalSeekBar vskb = null;
private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); //这条是蓝牙串口通用的UUID，不要更改
private static String address = "00:12:02:22:06:61"; // <==要连接的蓝牙设备MAC地址
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
this.vskb = (VerticalSeekBar)super.findViewById(R.id.mskb);
this.vskb.setOnSeekBarChangeListener(new OnSeekBarChangeListenerX());
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if(mBluetoothAdapter == null)
{
Toast.makeText(this, "Bluetooth is not available.", Toast.LENGTH_LONG).show();
finish();
return;
}
if(!mBluetoothAdapter.isEnabled())
{
Toast.makeText(this, "Please enable your Bluetooth and re-run this program.", Toast.LENGTH_LONG).show();
finish();
return;
}
}
private class OnSeekBarChangeListenerX implements VerticalSeekBar.OnSeekBarChangeListener {
public void onProgressChanged(VerticalSeekBar seekBar, int progress, boolean fromUser) {
//Main.this.clue.setText(seekBar.getProgress());
/* String message;
byte [] msgBuffer;
try {
outStream = btSocket.getOutputStream();
} catch (IOException e) {
Log.e(TAG,"ON RESUME : Output Stream creation failed.", e);
}
message =Integer.toString( seekBar.getProgress() );
msgBuffer = message.getBytes();
try{
outStream.write(msgBuffer);
} catch (IOException e) {
Log.e (TAG, "ON RESUME : Exception during write.", e);
} */
}
public void onStartTrackingTouch(VerticalSeekBar seekBar) {
String message;
byte [] msgBuffer;
try {
outStream = btSocket.getOutputStream();
} catch (IOException e) {
Log.e(TAG,"ON RESUME : Output Stream creation failed.", e);
}
message =Integer.toString( seekBar.getProgress() );
msgBuffer = message.getBytes();
try{
outStream.write(msgBuffer);
} catch (IOException e) {
Log.e (TAG, "ON RESUME : Exception during write.", e);
}
}
public void onStopTrackingTouch(VerticalSeekBar seekBar) {
String message;
byte [] msgBuffer;
try {
outStream = btSocket.getOutputStream();
} catch (IOException e) {
Log.e(TAG,"ON RESUME : Output Stream creation failed.", e);
}
message =Integer.toString( seekBar.getProgress() );
msgBuffer = message.getBytes();
try{
outStream.write(msgBuffer);
} catch (IOException e) {
Log.e (TAG, "ON RESUME : Exception during write.", e);
}
}
}
@Override
public void onStart()
{
super.onStart();
}
@Override
public void onResume()
{
super.onResume();
BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
try {
btSocket = device.createRfcommSocketToServiceRecord(MY_UUID);
} catch (IOException e) {
Log.e(TAG, "ON RESUME: Socket creation failed.", e);
}
mBluetoothAdapter.cancelDiscovery();
try {
btSocket.connect();
Log.e(TAG, "ON RESUME: BT connection established, data transfer link open.");
} catch (IOException e) {
try {
btSocket.close();
} catch (IOException e2) {
Log .e(TAG,"ON RESUME: Unable to close socket during connection failure", e2);
}
}
// Create a data stream so we can talk to server.
/* try {
outStream = btSocket.getOutputStream();
inStream = btSocket.getInputStream();
} catch (IOException e) {
Log.e(TAG, "ON RESUME: Output stream creation failed.", e);
}
String message = "read";
byte[] msgBuffer = message.getBytes();
try {
outStream.write(msgBuffer);
} catch (IOException e) {
Log.e(TAG, "ON RESUME: Exception during write.", e);
}
int ret = -1;
while( ret != -1)
{
try {
ret = inStream.read();
} catch (IOException e)
{
e.printStackTrace();
}
}
*/
}
@Override
public void onPause()
{
super.onPause();
if (outStream != null)
{
try {
outStream.flush();
} catch (IOException e) {
Log.e(TAG, "ON PAUSE: Couldn't flush output stream.", e);
}
}
try {
btSocket.close();
} catch (IOException e2) {
Log.e(TAG, "ON PAUSE: Unable to close socket.", e2);
}
}
@Override
public void onStop()
{
super.onStop();
}
@Override
public void onDestroy()
{
super.onDestroy();
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event){
if(keyCode == KeyEvent.KEYCODE_BACK){
this.exitDialog();
}
return false;
}
private void exitDialog(){
Dialog dialog = new AlertDialog.Builder(MetalSeed.this)
.setTitle("退出程序？")
.setMessage("您确定要退出本程序吗？")
.setPositiveButton("确定", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
MetalSeed.this.finish();
}
}).setNegativeButton("取消", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) { }
}).create();
dialog.show();
}
}
此为上述demo的layout
<RelativeLayout xmlns:android="http:///apk/res/android"
xmlns:tools="http:///tools"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/bcf" >
<TextView
android:id="@+id/myt"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="48dp"
android:text="MetalSeed"
android:textSize="40dip" />
<com.example.seed2.VerticalSeekBar
android:id="@+id/mskb"
android:layout_width="105dp"
android:layout_height="219dp"
android:layout_below="@+id/myt"
android:layout_centerHorizontal="true"
android:layout_marginTop="85dp"
android:maxHeight="95dip"
android:minHeight="95dip"
android:minWidth="95dip"
android:thumbOffset="0dip" />
</RelativeLayout>
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