BroadcastReceiver实现android来去电录音功能（外录）

因为原生android没有提供来去电内录功能，所以只能通过麦克进行通话录音，

<span style="font-size:18px;">/**
* 来去电录音，因为去电没有接听的状态，只要拨出就会开始录音
*
* @author jaeuken
* @date 2015-1-4
*/
public class PhoneBroadcastReceiver extends BroadcastReceiver {

private static String outgoingNumber = "";
private static String incomeNumber = "";
private String state = "";
private static MediaRecorder mediaRecorder;
@Override
public void onReceive(Context context, Intent intent) {
/*去电时：
* 未接：phone_state=OFFHOOK;
* 挂断：phone_state=IDLE
* 来电时: *
* 未接：phone_state=RINGING
* 已接：phone_state=OFFHOOK;
* 挂断：phone_state=IDLE**/
//如果是拨打电话
if(intent.getAction().equals(Intent.ACTION_NEW_OUTGOING_CALL)){
outgoingNumber = intent.getStringExtra(Intent.EXTRA_PHONE_NUMBER);
}
if(intent.getAction().equals("android.intent.action.PHONE_STATE")){
state = intent.getStringExtra(TelephonyManager.EXTRA_STATE);
if("RINGING".equals(state)){
incomeNumber = intent.getStringExtra(TelephonyManager.EXTRA_INCOMING_NUMBER);
}
if("OFFHOOK".equals(state)){//来电接通或去电（无法判断是否接通），开始录音
Thread recordingThread = new Thread() {
@Override
public void run() {
try {
File dirFile = Environment.getExternalStorageDirectory();
File file;
//根据用来电号码是否为空判断来去电
if(incomeNumber!=null&&incomeNumber.length()>0){
file = new File(dirFile, "IN_"+incomeNumber +"_" + System.currentTimeMillis() + ".3gp");
}else{
file = new File(dirFile, "OUT_"+outgoingNumber +"_" + System.currentTimeMillis() + ".3gp");
}

mediaRecorder = new MediaRecorder();
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); //获得声音数据源
mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); // 按3gp格式输出
mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
mediaRecorder.setOutputFile(file.getAbsolutePath()); //输出文件
mediaRecorder.prepare();
mediaRecorder.start();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} //准备

}
};
recordingThread.start();
}
if("IDLE".equals(state)){//挂断，停止录音
if(mediaRecorder != null){
mediaRecorder.stop();
mediaRecorder.reset();
mediaRecorder.release();
mediaRecorder = null;
outgoingNumber = "";
incomeNumber = "";
}
}
}
}

}</span>

需要的权限配置
<span style="font-size:14px;"> </span><span style="font-size:18px;"><!-- 在SDCard中创建与删除文件权限 -->  
    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>  
    <!-- 在SDCard写入数据权限 -->  
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>  
    <!-- 刻入声音权限 -->  
    <uses-permission android:name="android.permission.RECORD_AUDIO"/>
    <uses-permission android:name="android.permission.PROCESS_OUTGOING_CALLS"></uses-permission>
</span>

<span style="font-size:18px;"><receiver android:name="com.test.recordphone.PhoneBroadcastReceiver">  
            <intent-filter >  
               <action android:name="android.intent.action.PHONE_STATE"/>
               <action android:name="android.intent.action.NEW_OUTGOING_CALL" />
            </intent-filter>  
        </receiver>
</span>