我正在尝试用 Kotlin 编写一个 CallRecorder 应用程序。我想要做的是开始使用 BroadcastReceiver 启动的服务录制音频。我认为我在 MediaRecorder 初始化方面做错了什么，但我不知道是什么。
编辑: 找到并解决了 MediaRecorder 问题(将文件名从“dd.MMM.yyyy-HH:mm:ss”更改为“dd.MMM.yyyy”。Android 不喜欢文件名中的冒号)。 现在它给了我一个关于 IntentService 的“致命异常(exception)”。查看下面更新的堆栈跟踪。
list :
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<service android:name=".RecordService"
android:exported="false"/>
<receiver android:name=".CallReceiver" android:exported="true">
<intent-filter>
<action android:name="android.intent.action.PHONE_STATE"/>
</intent-filter>
</receiver>
<activity
android:name=".MainActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
主要 Activity :
class MainActivity : AppCompatActivity(), NavigationView.OnNavigationItemSelectedListener, ActivityCompat.OnRequestPermissionsResultCallback {
private val READ_PHONE_STATE : String = Manifest.permission.READ_PHONE_STATE
private val RECORD_AUDIO : String = Manifest.permission.RECORD_AUDIO
private val WRITE_EXTERNAL_STORAGE : String = Manifest.permission.WRITE_EXTERNAL_STORAGE
private val PERMISSION_LIST = arrayOf(READ_PHONE_STATE, RECORD_AUDIO, WRITE_EXTERNAL_STORAGE)
private val REQUEST_CODE : Int = 101
private val PERMISSION_GRANTED : Int = PackageManager.PERMISSION_GRANTED
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
setSupportActionBar(toolbar)
/*fab.setOnClickListener { view ->
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show()
}*/
checkPermissions()
val toggle = ActionBarDrawerToggle(
this, drawer_layout, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close)
drawer_layout.addDrawerListener(toggle)
toggle.syncState()
nav_view.setNavigationItemSelectedListener(this)
}
fun checkPermissions(){
var tempPermissionList : Array<String?> = arrayOfNulls(3)
var position : Int = 0
for(permission in PERMISSION_LIST){
if(ContextCompat.checkSelfPermission(this, permission) != PERMISSION_GRANTED) tempPermissionList.set(position, permission)
position++
}
if(!tempPermissionList.isEmpty()){
ActivityCompat.requestPermissions(this, tempPermissionList, REQUEST_CODE)
}
}
override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
if(requestCode == REQUEST_CODE) super.onRequestPermissionsResult(requestCode, permissions, grantResults)
}
override fun onBackPressed() {
if (drawer_layout.isDrawerOpen(GravityCompat.START)) {
drawer_layout.closeDrawer(GravityCompat.START)
} else {
super.onBackPressed()
}
}
override fun onCreateOptionsMenu(menu: Menu): Boolean {
// Inflate the menu; this adds items to the action bar if it is present.
menuInflater.inflate(R.menu.main, menu)
return true
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
when (item.itemId) {
R.id.action_settings -> return true
else -> return super.onOptionsItemSelected(item)
}
}
override fun onNavigationItemSelected(item: MenuItem): Boolean {
// Handle navigation view item clicks here.
when (item.itemId) {
R.id.nav_camera -> {
// Handle the camera action
}
R.id.nav_gallery -> {
}
R.id.nav_slideshow -> {
}
R.id.nav_manage -> {
}
R.id.nav_share -> {
}
R.id.nav_send -> {
}
}
drawer_layout.closeDrawer(GravityCompat.START)
return true
}
记录器:
class Recorder {
val TAG : String = "RECORDER"
var mediaRecorder : MediaRecorder? = null
fun startRecording(){
if(mediaRecorder != null){
mediaRecorder!!.stop()
mediaRecorder!!.reset()
mediaRecorder!!.release()
mediaRecorder = null
}
mediaRecorder = MediaRecorder()
mediaRecorder!!.setAudioSource(MediaRecorder.AudioSource.VOICE_CALL)
mediaRecorder!!.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP)
mediaRecorder!!.setOutputFile(generateFilePath())
mediaRecorder!!.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_WB)
try {
mediaRecorder!!.prepare()
} catch (e:Exception){
Log.e(TAG, "prepare() failed")
}
mediaRecorder!!.start()
}
fun stopRecording(){
if(mediaRecorder != null){
mediaRecorder!!.stop()
mediaRecorder!!.release()
mediaRecorder = null
}
}
private fun getCurrentDate() : String{
val calendar = java.util.Calendar.getInstance()
val dateFormat = SimpleDateFormat("dd.MMM.yyyy")
val date : String = dateFormat.format(calendar.time)
return date
}
private fun generateFilePath() : String{
return Environment.getExternalStorageDirectory().absolutePath + "/" + getCurrentDate() + ".3gp"
}
调用接收者:
class CallReceiver : BroadcastReceiver() {
private val TAG = "CALL_RECEIVER"
private val PHONE_STATE : String = "PHONE_STATE"
private val START_RECORDING : String = "START_RECORDING"
private val STOP_RECORDING : String = "STOP_RECORDING"
//private lateinit var mRecorder : Recorder
override fun onReceive(context: Context?, intent: Intent?) {
val phoneState : String? = intent?.getStringExtra(TelephonyManager.EXTRA_STATE)
if(phoneState.equals(TelephonyManager.EXTRA_STATE_OFFHOOK)){
Toast.makeText(context, "REGISTRAZIONE INIZIATA", Toast.LENGTH_SHORT).show()
Log.d(TAG, "START RECORDING")
var intent2 = Intent(context, RecordService::class.java)
intent2.putExtra(PHONE_STATE, START_RECORDING)
context?.startService(intent2)
//if(mRecorder == null) mRecorder = Recorder()
//mRecorder.startRecording()
} else if (phoneState.equals(TelephonyManager.EXTRA_STATE_IDLE)){
Toast.makeText(context, "REGISTRAZIONE TERMINATA", Toast.LENGTH_SHORT).show()
Log.d(TAG, "STOP RECORDING")
var intent3 = Intent(context, RecordService::class.java)
intent3.putExtra(PHONE_STATE, STOP_RECORDING)
context?.startService(intent3)
//mRecorder.stopRecording()
}
}
记录服务:
class RecordService : IntentService("RecordService") {
private val PHONE_STATE : String = "PHONE_STATE"
private val START_RECORDING : String = "START_RECORDING"
private val STOP_RECORDING : String = "STOP_RECORDING"
private lateinit var mRecorder : Recorder
override fun onCreate() {
mRecorder = Recorder()
super.onCreate()
}
override fun onHandleIntent(intent: Intent?) {
when(intent?.getStringExtra(PHONE_STATE)){
START_RECORDING -> mRecorder.startRecording()
STOP_RECORDING -> mRecorder.stopRecording()
}
}
override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
return super.onStartCommand(intent, flags, startId)
}
堆栈跟踪:
06-25 19:11:12.889 9104-9104/com.example.luca.kallrecorder D/CALL_RECEIVER: START RECORDING
06-25 19:11:12.897 9104-9104/com.example.luca.kallrecorder D/CALL_RECEIVER: START RECORDING
06-25 19:11:12.928 9104-9123/com.example.luca.kallrecorder D/EGL_emulation: eglMakeCurrent: 0xae834c40: ver 2 0
06-25 19:11:12.930 9104-9139/com.example.luca.kallrecorder E/MediaRecorder: start failed: -2147483648
06-25 19:11:12.931 9104-9139/com.example.luca.kallrecorder E/AndroidRuntime: FATAL EXCEPTION: IntentService[RecordService]
Process: com.example.luca.kallrecorder, PID: 9104
java.lang.RuntimeException: start failed.
at android.media.MediaRecorder.start(Native Method)
at com.example.luca.kallrecorder.Recorder.startRecording(Recorder.kt:33)
at com.example.luca.kallrecorder.RecordService.onHandleIntent(RecordService.kt:25)
at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:65)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.os.HandlerThread.run(HandlerThread.java:61)
06-25 19:11:12.952 9104-9123/com.example.luca.kallrecorder V/RenderScript: 0xae8eb800 Launching thread(s), CPUs 4
06-25 19:11:14.891 9104-9123/com.example.luca.kallrecorder D/EGL_emulation: eglMakeCurrent: 0xae834c40: ver 2 0
06-25 19:11:14.929 9104-9123/com.example.luca.kallrecorder D/EGL_emulation: eglMakeCurrent: 0xae834c40: ver 2 0
最佳答案
正如 Mike M. 在评论中所建议的，我通过实现服务而不是 IntentService 来解决。我引用 Mike M. 的话:“IntentService... 每次 onHandleIntent() 完成后都会立即停止。”。 我想一旦系统失去对 onHandleIntent() 的引用，MediaRecorder 实例就会消失。
我的应用程序还没有按预期工作，但这不是因为那个错误。实际上它现在编译和运行没有任何错误。
这是更新的 RecordService 类，实现服务:
class RecordService : Service() {
private val PHONE_STATE : String = "PHONE_STATE"
private val START_RECORDING : String = "START_RECORDING"
private val STOP_RECORDING : String = "STOP_RECORDING"
private var mRecorder : Recorder? = null
private lateinit var mServiceLooper : Looper
override fun onCreate() {
mRecorder = Recorder()
super.onCreate()
}
override fun onBind(intent: Intent?): IBinder {
TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
}
override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
when(intent?.getStringExtra(PHONE_STATE)){
START_RECORDING -> thread { Runnable { kotlin.run { mRecorder!!.stopRecording() } } }
STOP_RECORDING -> thread { Runnable { kotlin.run { mRecorder!!.stopRecording() } } }
}
return super.onStartCommand(intent, flags, startId)
}
关于Android:IntentService 致命异常，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/51029008/