android bluetooth api

蓝牙：

1，是目前使用最广泛的无线通讯协议

2.主要针对短距离通讯（10M）

3.常用于连接耳机，鼠标，和移动通读设备等

与蓝牙相关的API

1.BluetoothAdapter

这类的对象代表了本地的蓝牙适配器

2.BluetoothDevice:

代表了一个远程的Bluetooth设备

扫描已配对的蓝牙设备

在AndroidManifest.xml声明蓝牙权限：

<uses-permission
android:name="android.permission.BLUETOOTH">
</uses-permission>

例子：

package com.example.bluetoothtest.bluetoothtest;

import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.media.AudioManager;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.os.StatFs;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import java.io.File;
import java.io.IOException;
import java.util.Set;

public class MainActivity extends Activity {

private static String mFileName = null;
private  static  String TAG = "BT_android";
MediaRecorder mMediaRecorder;
private int record_state;
private static int ENABLE_BT = 1;
private static int DISABLE_BT = 0;

/*tmp file front*/
private  String strTempFile = "recaudio_";
/*record audio*/
private File mRecordAudioFile;
private File mRecordAudioPath;
private AudioManager  mAudioManager;
private Handler mHandler = new Handler()
{
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what)
{
case 1:
Log.d(TAG,"1-----------");
Toast.makeText(getApplication(),"1111111",Toast.LENGTH_LONG).show();

break;
case 0:
Log.d(TAG,"0-----------");
Toast.makeText(getApplication(),"000000",Toast.LENGTH_LONG).show();
break;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mMediaRecorder  = new MediaRecorder();
final Button startBT = (Button)findViewById(R.id.mybluetooth) ;
Button stopBT = (Button)findViewById(R.id.stopBT);
Button unpairBT = (Button)findViewById(R.id.unpairDevice);
Button startRecord = (Button)findViewById(R.id.startRecord);
Button stopRecord = (Button)findViewById(R.id.stopRecord);
Button visableBT = (Button)findViewById(R.id.visableBT);
final TextView stateBT = (TextView)findViewById(R.id.stateBT);

final TextView bounddeviceBT = (TextView)findViewById(R.id.bounddeviceBT);

mAudioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);

/*mMediaRecorder = new MediaRecorder();*/

final BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();

if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))
{
/*get sdcard's path*/
mRecordAudioPath = Environment.getExternalStorageDirectory();

}
else
{
Toast.makeText(getApplicationContext(),"no sdcard in box",Toast.LENGTH_LONG);
}

startBT.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
adapter.enable();

Log.d(TAG,"enable BT");

//打开本机的蓝牙发现功能（默认打开120秒，可以将时间最多延长至300秒）
/*    Intent discoveryIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
discoveryIntent.putE
xtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);//设置持续时间（最多300秒）*/

/*取到扫描到的可见蓝牙设备*/
registerReceiver(new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
BluetoothDevice mdevBT = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
Log.e(TAG,mdevBT.getName() + mdevBT.getAddress());

}
},new IntentFilter(BluetoothDevice.ACTION_FOUND));
adapter.startDiscovery();

/*得到适配器中已配对过的设备信息*/
Set<BluetoothDevice> mPairDevice = adapter.getBondedDevices();

if (mPairDevice.size()> 0)
for (BluetoothDevice mBtDevice:mPairDevice)
{
bounddeviceBT.append("\nName:" + mBtDevice.getName() + "\tMac:" + mBtDevice.getAddress() + "\n");
}
Toast.makeText(getApplicationContext(),"scanning-----",Toast.LENGTH_LONG).show();

Message mMessage = new Message();
mMessage.what = 1;
mHandler.sendMessage(mMessage);
if (adapter.getState() == adapter.STATE_ON)
{
stateBT.setText("enable BT");
}
else
{
stateBT.setText("disable BT");
}

}
});

//关闭蓝牙

stopBT.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
adapter.disable();

Log.d(TAG,"state:"+ adapter.getState());

if (adapter.getState() == adapter.STATE_ON)
{
stateBT.setText("enable BT");
}
else
{
stateBT.setText("disable BT");
}
Toast.makeText(getApplicationContext(),"disable BT",Toast.LENGTH_SHORT).show();
}
});

unpairBT.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Log.d(TAG,"unpair BT");
if (adapter.getState() == adapter.STATE_ON)
{
stateBT.setText("enable BT");
}
else
{
stateBT.setText("disable BT");
}
Toast.makeText(getApplicationContext(),"unpair BT",Toast.LENGTH_SHORT).show();

}
});

startRecord.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {

/* mRecordAudioFile = File.createTempFile(strTempFile,".amr",mRecordAudioPath);*/

mRecordAudioFile = new File(mRecordAudioPath.toString(), "zyk.mp3");

Toast.makeText(getApplicationContext(), mRecordAudioPath.toString(), Toast.LENGTH_LONG).show();

if (!mAudioManager.isBluetoothScoAvailableOffCall()) {
Toast.makeText(getApplicationContext(), "BT is not support record", Toast.LENGTH_LONG);
return;
}

/*new a mediarecorder list*/

/*set the source */
mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);

/*set the  format*/
mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);

/*set the encorder*/
mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

/*set outpout file's pathc*/
mMediaRecorder.setOutputFile(mRecordAudioFile.getAbsolutePath());

try {
mMediaRecorder.prepare();
} catch (IOException e) {
e.printStackTrace();
}

if (!mAudioManager.isBluetoothScoAvailableOffCall())
{
Log.d(TAG,"system not support BT record");
return;
}

mAudioManager.startBluetoothSco();

registerReceiver(new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
record_state = intent.getByteExtra(AudioManager.ACTION_SCO_AUDIO_STATE_CHANGED,(byte)-1);
if (AudioManager.SCO_AUDIO_STATE_CONNECTED == record_state) {
mAudioManager.setBluetoothScoOn(true);
mMediaRecorder.start();
unregisterReceiver(this);
}else {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}

},new IntentFilter(AudioManager.ACTION_SCO_AUDIO_STATE_CHANGED));

}

});

stopRecord.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (mMediaRecorder != null) {
/*   mMediaRecorder.stop();*/
mMediaRecorder.release();
mMediaRecorder = null;
/*  mAudioManager.setBluetoothScoOn(false);
mAudioManager.stopBluetoothSco();*/
}
}
});

visableBT.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent mvisableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
mvisableBtIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION,360);
startActivity(mvisableBtIntent);
Toast.makeText(getApplicationContext(),"mvisableBtIntent",Toast.LENGTH_LONG).show();
}
});

};

}

修改蓝牙设备的可见性，需要以下权限：

<uses-permission android:name="android.permission.BLUETOOTH_ADMIN">
</uses-permission>

如下将蓝牙适配器可见的时间调整为70s

Intent mvisableBtIntent = new
Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);   mvisableBtIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION,70);
startActivity(mvisableBtIntent);   Toast.makeText(getApplicationContext(),"mvisableBtIntent",Toast.LENGTH_LONG).show();
``