我正在尝试创建呼叫记录器以在后台运行Service但我得到MediaRecorder启动失败错误，当它尝试在后台启动mediarecorder时，java代码给出
使用的Java代码如下：
MainActivity.java
package com.example.callrecorder2;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends ActionBarActivity {
// onCreate method.
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Initialise display.
setContentView(R.layout.activity_main);
// Declare buttons for Start and Stop.
Button startService = (Button)findViewById(R.id.startbutton);
Button stopService = (Button)findViewById(R.id.stopbutton);
// Set listeners for buttons.
startService.setOnClickListener(startServiceListener);
stopService.setOnClickListener(stopServiceListener);
// Initialise serviceStatus text field in display.
TextView tv = (TextView) findViewById(R.id.recording_status);
tv.setText(getString(R.string.rec_stop_status));
}
// Define OnClickListener for Start Service button.
private OnClickListener startServiceListener = new OnClickListener() {
public void onClick(View v){
// Start the Service.
Intent serviceIntent = new Intent(MainActivity.this,callreceiverservice.class);
startService(serviceIntent);
Log.i("DUMDUM","Start Button Clicked");
// Display Service Running message.
TextView tv = (TextView) findViewById(R.id.recording_status);
tv.setText(getString(R.string.rec_start_status));
}
};
// Define OnClickListener for Stop Service button.
private OnClickListener stopServiceListener = new OnClickListener() {
public void onClick(View v){
// Stop the Service.
Intent serviceIntent = new Intent(MainActivity.this,callreceiverservice.class);
stopService(serviceIntent);
Log.i("DUMDUM","Stop Button Clicked");
// Display Service Not Running message.
TextView tv = (TextView) findViewById(R.id.recording_status);
tv.setText(getString(R.string.rec_stop_status));
}
};
}
callreceiverservice.java
package com.example.callrecorder2;
import java.io.File;
import java.io.IOException;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.media.MediaRecorder;
import android.os.Environment;
import android.os.IBinder;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.util.Log;
import android.widget.Toast;
public class callreceiverservice extends Service {
int checkIt = 0;
Context contextt;
private static final String ACTION="android.intent.action.PHONE_STATE";
private BroadcastReceiver yourReceiver;
private static final String AUDIO_RECORDER_FILE_EXT_3GP = ".3gp";
private static final String AUDIO_RECORDER_FILE_EXT_MP4 = ".mp4";
private static final String AUDIO_RECORDER_FOLDER = "AudioRecorder";
private MediaRecorder recorder = null;
private int currentFormat = 0;
private int output_formats[] = { MediaRecorder.OutputFormat.THREE_GPP ,MediaRecorder.OutputFormat.MPEG_4 };
private String file_exts[] = { AUDIO_RECORDER_FILE_EXT_3GP , AUDIO_RECORDER_FILE_EXT_MP4 };
@Override
public IBinder onBind(Intent arg0) {
// TODO Auto-generated method stub
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId)
{
Log.i("DUMDUM","Into onStartCommand");
final IntentFilter theFilter = new IntentFilter();
theFilter.addAction(ACTION);
this.yourReceiver = new BroadcastReceiver(){
@Override
public void onReceive(Context context, Intent intent) {
contextt = context;
TelephonyManager tm = (TelephonyManager) context.getSystemService(
Context.TELEPHONY_SERVICE);
tm.listen(new CallStateListener(), PhoneStateListener.LISTEN_CALL_STATE);
Log.i("DUMDUM","Into onRecieve");
}
};
this.registerReceiver(this.yourReceiver, theFilter);
return START_STICKY;
}
class CallStateListener extends PhoneStateListener {
private String getFilename(){
String filepath = Environment.getExternalStorageDirectory().getPath();
File file = new File(filepath,AUDIO_RECORDER_FOLDER);
if(!file.exists()){
file.mkdirs();
}
return (file.getAbsolutePath() + "/" + System.currentTimeMillis() + file_exts[currentFormat]);
}
private MediaRecorder.OnErrorListener errorListener = new MediaRecorder.OnErrorListener() {
@Override
public void onError(MediaRecorder mr, int what, int extra) {
AppLog.logString("Error: " + what + ", " + extra);
}
};
private MediaRecorder.OnInfoListener infoListener = new MediaRecorder.OnInfoListener() {
@Override
public void onInfo(MediaRecorder mr, int what, int extra) {
AppLog.logString("Warning: " + what + ", " + extra);
}
};
@Override
public void onCallStateChanged(int state, String incomingNumber) {
//Log.i("DUMDUM","Into Call state Listener Class");
super.onCallStateChanged(state, incomingNumber);
switch (state) {
case TelephonyManager.CALL_STATE_RINGING:
// called when someone is ringing to this phone
Toast.makeText(contextt, "Incoming: " + incomingNumber,
Toast.LENGTH_LONG).show();
checkIt = 1;
break;
case TelephonyManager.CALL_STATE_OFFHOOK:
Toast.makeText(contextt, "CALL_STATE_OFFHOOK " + incomingNumber,
Toast.LENGTH_LONG).show();
recorder = new MediaRecorder();
AppLog.logString("setAudioSource(): " + MediaRecorder.AudioSource.VOICE_CALL);
recorder.setAudioSource(MediaRecorder.AudioSource.VOICE_CALL);
AppLog.logString("setOutputFormat: " + output_formats[currentFormat]);
recorder.setOutputFormat(output_formats[currentFormat]);
AppLog.logString("setAudioEncoder(): " + MediaRecorder.AudioEncoder.AMR_NB);
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
AppLog.logString("getFilename(): " + getFilename());
recorder.setOutputFile(getFilename());
recorder.setOnErrorListener(errorListener);
recorder.setOnInfoListener(infoListener);
try {
recorder.prepare();
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
recorder.start();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
checkIt = 0;
break;
case TelephonyManager.CALL_STATE_IDLE:
Toast.makeText(contextt, "CALL_STATE_IDLE " + incomingNumber,
Toast.LENGTH_LONG).show();
if (recorder != null) {
recorder.stop();
recorder.release();
recorder = null;
}
if (checkIt == 1) {
//startting the service
break;
}
}
}
}
@Override
public void onDestroy() {
super.onDestroy();
// Do not forget to unregister the receiver!!!
Log.i("DUMDUM","Into onDestroy");
this.unregisterReceiver(this.yourReceiver);
}
}
AppLog.java
package com.example.callrecorder2;
import android.util.Log;
public class AppLog {
private static final String APP_TAG = "AudioRecorder";
public static int logString(String message){
return Log.i(APP_TAG,message);
}
}
的AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.callrecorder2"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="21" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
<uses-permission android:name="android.permission.RECORD_AUDIO"></uses-permission>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<service android:name=".callreceiverservice">
</service>
</application>
</manifest>
应用程序的Logcat显示错误消息：
08-19 19:49:06.582: E/MediaRecorder(942): start failed: -2147483648
08-19 19:49:06.582: D/AndroidRuntime(942): Shutting down VM
08-19 19:49:06.582: W/dalvikvm(942): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
08-19 19:49:06.602: E/AndroidRuntime(942): FATAL EXCEPTION: main
08-19 19:49:06.602: E/AndroidRuntime(942): java.lang.RuntimeException: start failed.
08-19 19:49:06.602: E/AndroidRuntime(942): at android.media.MediaRecorder.start(Native Method)
08-19 19:49:06.602: E/AndroidRuntime(942): at com.example.callrecorder2.callreceiverservice$CallStateListener.onCallStateChanged(callreceiverservice.java:124)
08-19 19:49:06.602: E/AndroidRuntime(942): at android.telephony.PhoneStateListener$2.handleMessage(PhoneStateListener.java:369)
08-19 19:49:06.602: E/AndroidRuntime(942): at android.os.Handler.dispatchMessage(Handler.java:99)
08-19 19:49:06.602: E/AndroidRuntime(942): at android.os.Looper.loop(Looper.java:137)
08-19 19:49:06.602: E/AndroidRuntime(942): at android.app.ActivityThread.main(ActivityThread.java:5041)
08-19 19:49:06.602: E/AndroidRuntime(942): at java.lang.reflect.Method.invokeNative(Native Method)
08-19 19:49:06.602: E/AndroidRuntime(942): at java.lang.reflect.Method.invoke(Method.java:511)
08-19 19:49:06.602: E/AndroidRuntime(942): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
08-19 19:49:06.602: E/AndroidRuntime(942): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
08-19 19:49:06.602: E/AndroidRuntime(942): at dalvik.system.NativeStart.main(Native Method)
请帮助解决此错误，因为我已尝试过所有内容但运行时错误不会消失。
答案 0 :(得分：0)
我能够使用实际手机通过Throwable Try来运行应用程序来记录通话，在其周围捕捉到阻止，错误仍然会发生，但我可以通过实际手机传递它。
try { recorder.start();
}catch (Throwable t) {
t.printStackTrace();
Log.w("TEST", t);
注意：在模拟器上，即使将try catch块与Throwable一起使用，呼叫接收也不起作用并继续发出错误。