如何解决为什么我在 start() 或 stop() 方法上遇到异常？通话录音应用试用
嗨，我想制作一个通话录音应用。我没有安卓编程经验。
我构建了一些类，但出现了这个错误：
2021-02-10 19:25:03.474 14245-14245/com.codeforlite.myapplication E/MediaRecorder: start failed: -2147483648
2021-02-10 19:25:03.475 14245-14245/com.codeforlite.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.codeforlite.myapplication,PID: 14245
java.lang.RuntimeException: start failed.
at android.media.MediaRecorder.start(Native Method)
at com.codeforlite.myapplication.CallReceiver$1.onCallStateChanged(CallReceiver.java:81)
at android.telephony.PhoneStateListener$IPhoneStateListenerStub.lambda$onCallStateChanged$10(PhoneStateListener.java:1185)
at android.telephony.-$$Lambda$PhoneStateListener$IPhoneStateListenerStub$6czWSGzxct0CXPVO54T0aq05qls.run(Unknown Source:6)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:223)
at android.app.ActivityThread.main(ActivityThread.java:7656)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
这是我的课程： 电话呼叫接收器
import java.util.Date;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.telephony.TelephonyManager;
abstract class PhoneCallReceiver extends BroadcastReceiver {
//The receiver will be recreated whenever android feels like it. We need a static variable to remember data between instantiations
private static int lastState = TelephonyManager.CALL_STATE_IDLE;
private static Date callStartTime;
private static boolean isIncoming;
private static String savedNumber; //because the passed incoming is only valid in ringing
protected Context context;
@Override
public void onReceive(Context context,Intent intent) {
this.context = context;
//We listen to two intents. The new outgoing call only tells us of an outgoing call. We use it to get the number.
if (intent.getAction().equals("android.intent.action.NEW_OUTGOING_CALL")) {
savedNumber = intent.getExtras().getString("android.intent.extra.PHONE_NUMBER");
}
else{
String stateStr = intent.getExtras().getString(TelephonyManager.EXTRA_STATE);
String number = intent.getExtras().getString(TelephonyManager.EXTRA_INCOMING_NUMBER);
int state = 0;
if(stateStr.equals(TelephonyManager.EXTRA_STATE_IDLE)){
state = TelephonyManager.CALL_STATE_IDLE;
}
else if(stateStr.equals(TelephonyManager.EXTRA_STATE_OFFHOOK)){
state = TelephonyManager.CALL_STATE_OFFHOOK;
}
else if(stateStr.equals(TelephonyManager.EXTRA_STATE_RINGING)){
state = TelephonyManager.CALL_STATE_RINGING;
}
onCallStateChanged(context,state,number);
}
}
//Derived classes should override these to respond to specific events of interest
protected abstract void onIncomingCallReceived(Context ctx,String number,Date start);
protected abstract void onIncomingCallAnswered(Context ctx,Date start);
protected abstract void onIncomingCallEnded(Context ctx,Date start,Date end);
protected abstract void onOutgoingCallStarted(Context ctx,Date start);
protected abstract void onOutgoingCallEnded(Context ctx,Date end);
protected abstract void onMissedCall(Context ctx,Date start);
//Deals with actual events
//Incoming call- goes from IDLE to RINGING when it rings,to OFFHOOK when it's answered,to IDLE when its hung up
//Outgoing call- goes from IDLE to OFFHOOK when it dials out,to IDLE when hung up
public void onCallStateChanged(Context context,int state,String number) {
if(lastState == state){
//No change,debounce extras
return;
}
switch (state) {
case TelephonyManager.CALL_STATE_RINGING:
isIncoming = true;
callStartTime = new Date();
savedNumber = number;
onIncomingCallReceived(context,number,callStartTime);
break;
case TelephonyManager.CALL_STATE_OFFHOOK:
//Transition of ringing->offhook are pickups of incoming calls. Nothing done on them
if(lastState != TelephonyManager.CALL_STATE_RINGING){
isIncoming = false;
callStartTime = new Date();
onOutgoingCallStarted(context,savedNumber,callStartTime);
}
else
{
isIncoming = true;
callStartTime = new Date();
onIncomingCallAnswered(context,callStartTime);
}
break;
case TelephonyManager.CALL_STATE_IDLE:
//Went to idle- this is the end of a call. What type depends on previous state(s)
if(lastState == TelephonyManager.CALL_STATE_RINGING){
//Ring but no pickup- a miss
onMissedCall(context,callStartTime);
}
else if(isIncoming){
onIncomingCallEnded(context,callStartTime,new Date());
}
else{
onOutgoingCallEnded(context,new Date());
}
break;
}
lastState = state;
}
}
呼叫接收器类：（在 setAudioSource() 部分中，我尝试了 mic、voice_call、voice_communication。对于 'voice_call'，我在 'start()' 方法上出错，其他人在 'stop()' 方法上出错）
> import android.Manifest;
import android.app.Activity;
import android.content.Context;
import android.media.MediaRecorder;
import android.os.Environment;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.text.format.DateFormat;
import android.util.Log;
import android.widget.Toast;
import androidx.core.app.ActivityCompat;
import java.io.File;
import java.io.IOException;
import java.util.Date;
import static android.widget.Toast.LENGTH_SHORT;
public class CallReceiver extends PhoneCallReceiver {
private static final int MY_PERMISSIONS = 800;
private MediaRecorder recorder;
public CallReceiver(){
this.recorder=new MediaRecorder();
}
@Override
protected void onIncomingCallReceived(Context ctx,Date start) {
}
@Override
protected void onIncomingCallAnswered(Context ctx,Date start) {
TelephonyManager manager=(TelephonyManager)ctx.getSystemService(ctx.TELEPHONY_SERVICE);
manager.listen(new PhoneStateListener(){
@Override
public void onCallStateChanged(int state,String phoneNumber) {
if (TelephonyManager.CALL_STATE_OFFHOOK == state) {
File filePath= Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOCUMENTS);
CharSequence chsq= DateFormat.format("MM-dd-yy-hh-mm-ss",new Date().getTime());
if (recorder==null){recorder=new MediaRecorder();}
try {
recorder.setAudioSource(MediaRecorder.AudioSource.VOICE_RECOGNITION);
} catch (Exception e) {
Log.e("Error","SetAudioSource Failed");
e.printStackTrace();
}
recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
recorder.setOutputFile(filePath.getAbsolutePath()+"/"+chsq+"rec.3gp");
try {
recorder.prepare();
} catch (IOException e) {
e.printStackTrace();
}
recorder.start();
Toast.makeText(context,"Recording Started",LENGTH_SHORT).show();
}
},PhoneStateListener.LISTEN_CALL_STATE);
}
@Override
protected void onIncomingCallEnded(Context ctx,Date end) {
TelephonyManager manager=(TelephonyManager)ctx.getSystemService(ctx.TELEPHONY_SERVICE);
manager.listen(new PhoneStateListener() {
@Override
public void onCallStateChanged(int state,String phoneNumber) {
if (TelephonyManager.CALL_STATE_IDLE == state) {
recorder.stop();
recorder.reset();
recorder.release();
}
}
},PhoneStateListener.LISTEN_CALL_STATE);
}
@Override
protected void onOutgoingCallStarted(Context ctx,Date start) {
}
@Override
protected void onOutgoingCallEnded(Context ctx,Date end) {
}
@Override
protected void onMissedCall(Context ctx,Date start) {
}
}
主要活动：
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import android.Manifest;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity implements PermissionRequestCodes{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
checkPermissions();
}
public void checkPermissions(){
ActivityCompat.requestPermissions(this,new String[]{
Manifest.permission.READ_PHONE_STATE,Manifest.permission.RECORD_AUDIO,Manifest.permission.READ_EXTERNAL_STORAGE,Manifest.permission.WRITE_EXTERNAL_STORAGE},MY_PERMISSIONS);
}
}
和清单：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.codeforlite.myapplication">
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
<uses-permission android:name="android.permission.PROCESS_OUTGOING_CALLS"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<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">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver android:name=".CallReceiver" >
<intent-filter>
<action android:name="android.intent.action.PHONE_STATE" />
</intent-filter>
<intent-filter>
<action android:name="android.intent.action.NEW_OUTGOING_CALL" />
</intent-filter>
</receiver>
</application>
</manifest>
如果有人提供帮助，我将不胜感激。如果我的方式完全错误，我如何设法制作通话录音应用程序？
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