android录音机的一些问题整理

一、不用service实现后台录音功能

1.在onPause（）方法内实现：

if (mRecorder.state() == Recorder.RECORDING_STATE) {

if (mMode == true) {
mRecorder.stop();
return;
}

Intent notificationIntent = new Intent("android.provider.MediaStore.RECORD_SOUND");

PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);

long when = System.currentTimeMillis(); // notification time

Context context = getApplicationContext();

Notification notification = new Notification(R.drawable.ic_launcher_soundrecorder,null, when);

Resources res = getResources();

String message1 = res.getString(R.string.app_name);

String message2 = res.getString(R.string.recording_in_progress);
notification.setLatestEventInfo(context, message1, message2, contentIntent);
String ns = Context.NOTIFICATION_SERVICE;
NotificationManager mNotificationManager = (NotificationManager) getSystemService(ns);
mNotificationManager.notify(NOTIFICATION_ID, notification);
mInNotification = true;
}

2.onResume()方法内去掉通知栏内的通知

if (mInNotification == true) {

String ns = Context.NOTIFICATION_SERVICE;
NotificationManager mNotificationManager = (NotificationManager) getSystemService(ns);

mNotificationManager.cancel(NOTIFICATION_ID);

mInNotification = false;
}

3.在androidmanifext.xml中设置activity mode为singleTop。

二、录音文件使用当前时间

public String getCurrentTime(){
SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMddhhmmss");
String nowTime=sdf.format(new Date());
return nowTime;
}
public File createTempFile_test(String prefix, String suffix, File directory)
throws IOException {
// Force a prefix null check first
if (prefix.length() < 3) {
throw new IllegalArgumentException("prefix must be at least 3 characters");
}
if (suffix == null) {
suffix = ".tmp";
}
File tmpDirFile = directory;
if (tmpDirFile == null) {
String tmpDir = System.getProperty("java.io.tmpdir", ".");
tmpDirFile = new File(tmpDir);
}
File result;
result = new File(tmpDirFile, prefix + getCurrentTime() + suffix);
if(result.exists()){
result.delete();
}
if(!result.exists()){
result.createNewFile();
}
return result;
}

三。解决先开启一个录音播放器，按home键进去后台播放，此时通过短信附件开启录音机，这时应该关闭后台的那个录音机

解决办法使用广播进行关闭，代码如下：

//处理广播

public class SoundRecorder extends Activity
implements Button.OnClickListener, Recorder.OnStateChangedListener, OnSeekBarChangeListener {
private BroadcastReceiver mReceiver=new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
if(mRecorder!=null){
mRecorder.stop();
saveSample();
mRecorder.clear();
}
if (mInNotification == true) {

String ns = Context.NOTIFICATION_SERVICE;
NotificationManager mNotificationManager = (NotificationManager) getSystemService(ns);

mNotificationManager.cancel(NOTIFICATION_ID);

mInNotification = false;
}

}
};

//onCreate()中先发送广播再注册广播，第一次就接受不到广播，等第三方应用调用时起作用

Intent intent=new Intent();
intent.setAction(ACTION_STOP);
sendBroadcast(intent);

IntentFilter filter = new IntentFilter();
filter.addAction(ACTION_STOP);
this.registerReceiver(mReceiver, filter);

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