[JAVA/ANDROID] Problema Video Recording in background

[diabolik03]

Ciao a tutti ragazzi è un pochino di tempo che sto impazzendo per creare una classe che riesca a fare partire la registrazione video in automatico e sopratutto in background.

Avrò letto 2000 pagine di tutti i tipi e fatto altrettante ricerche e alla fine sono riuscito a creare una piccola classe che però mi da un errore.

Non riesco a capire cosa c'è che non va, spero che mi possiate dare una mano, vi posto il codice:

Questa è la classe che fa la registrazione video:

import java.io.IOException;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.media.CamcorderProfile;
import android.media.MediaRecorder;
import android.os.IBinder;
import android.view.Gravity;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;
import android.view.WindowManager;
import android.view.WindowManager.LayoutParams;
import android.widget.Toast;


public class CameraService extends Service implements SurfaceHolder.Callback {
    public WindowManager windowManager;
    public SurfaceView surfaceView;
    public Camera camera = null;
    public MediaRecorder mediaRecorder = null;
    
    
    @Override
    public int onStartCommand(Intent intent, int flags, int startId){
        windowManager = (WindowManager) this.getSystemService(Context.WINDOW_SERVICE);
        surfaceView = new SurfaceView(getApplicationContext());
        LayoutParams layoutParams = new WindowManager.LayoutParams(
                1, 1,
                WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY,
                WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH,
                PixelFormat.TRANSLUCENT
                );
        layoutParams.gravity = Gravity.LEFT | Gravity.TOP;
        windowManager.addView(surfaceView, layoutParams);
        surfaceView.getHolder().addCallback(this);
        return START_STICKY;
    }
    
    
    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        // TODO Auto-generated method stub
        if(camera == null){
            try {
                camera = camera.open();
                camera.setPreviewDisplay(holder);
                camera.startPreview();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        
        startRecording(holder);
    }
    
    public void startRecording(SurfaceHolder surfaceHolder){
        
        mediaRecorder = new MediaRecorder();
        
        mediaRecorder.setCamera(camera);                                                    //1°
        mediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);                    //2°
        mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);                        //3°
        mediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));        //4°
        mediaRecorder.setOutputFile("/sdcard/video.mp4");                                    //5°
        mediaRecorder.setPreviewDisplay(surfaceHolder.getSurface());                        //6°
        //TUTTI GLI STEP PER AL GESTIONE DELLA TELECAMERA SONO STATI FATTI
        try{ mediaRecorder.prepare(); 
        }catch(IOException e){
            Toast.makeText(getApplicationContext(), "Prepare cam failed!", 1).show();
        }
        mediaRecorder.start();
    }
    
    @Override
    public void onDestroy(){
        mediaRecorder.stop();
        mediaRecorder.reset();
        mediaRecorder.release();
        
        camera.release();


        windowManager.removeView(surfaceView);
    }


    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width,
            int height) {
        // TODO Auto-generated method stub
        
    }


    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        // TODO Auto-generated method stub
        
    }


    @Override
    public IBinder onBind(Intent intent) {
        // TODO Auto-generated method stub
        return null;
    }


}

Questo è il main:

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;


public class MainActivity extends Activity {
    Button startRecording;
    Button stopRecording;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        startRecording = (Button)findViewById(R.id.buttonStartRecording);
        stopRecording = (Button)findViewById(R.id.buttonStopRecording);
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }


    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // 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.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
    
    public void startRecording(View v){
        startService(new Intent(this, CameraService.class));
        Toast.makeText(getApplicationContext(), "Recording started!", 2).show();
    }
    
    public void stopRecording(View v){
        stopService(new Intent(this, CameraService.class));
        Toast.makeText(getApplicationContext(), "Recording stopped!", 2).show();
    }
}

Questo è il Manifest:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.testcameraservice"
    android:versionCode="1"
    android:versionName="1.0" >


    <uses-sdk
        android:minSdkVersion="14"
        android:targetSdkVersion="21" />
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.RECORD_AUDIO" />
    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <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:enabled="true" 
                  android:name=".CameraService">
        </service>
    </application>


</manifest>

e questo è l'errore che mi genera:

03-01 20:41:06.996: E/AndroidRuntime(7781): FATAL EXCEPTION: main
03-01 20:41:06.996: E/AndroidRuntime(7781): java.lang.RuntimeException: start failed.
03-01 20:41:06.996: E/AndroidRuntime(7781):     at android.media.MediaRecorder.start(Native Method)
03-01 20:41:06.996: E/AndroidRuntime(7781):     at com.example.testcameraservice.CameraService.startRecording(CameraService.java:77)
03-01 20:41:06.996: E/AndroidRuntime(7781):     at com.example.testcameraservice.CameraService.surfaceCreated(CameraService.java:59)
03-01 20:41:06.996: E/AndroidRuntime(7781):     at android.view.SurfaceView.updateWindow(SurfaceView.java:591)
03-01 20:41:06.996: E/AndroidRuntime(7781):     at android.view.SurfaceView.access$000(SurfaceView.java:81)
03-01 20:41:06.996: E/AndroidRuntime(7781):     at android.view.SurfaceView$3.onPreDraw(SurfaceView.java:173)
03-01 20:41:06.996: E/AndroidRuntime(7781):     at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:707)
03-01 20:41:06.996: E/AndroidRuntime(7781):     at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1944)
03-01 20:41:06.996: E/AndroidRuntime(7781):     at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1113)
03-01 20:41:06.996: E/AndroidRuntime(7781):     at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4481)
03-01 20:41:06.996: E/AndroidRuntime(7781):     at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
03-01 20:41:06.996: E/AndroidRuntime(7781):     at android.view.Choreographer.doCallbacks(Choreographer.java:555)
03-01 20:41:06.996: E/AndroidRuntime(7781):     at android.view.Choreographer.doFrame(Choreographer.java:525)
03-01 20:41:06.996: E/AndroidRuntime(7781):     at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
03-01 20:41:06.996: E/AndroidRuntime(7781):     at android.os.Handler.handleCallback(Handler.java:615)
03-01 20:41:06.996: E/AndroidRuntime(7781):     at android.os.Handler.dispatchMessage(Handler.java:92)
03-01 20:41:06.996: E/AndroidRuntime(7781):     at android.os.Looper.loop(Looper.java:137)
03-01 20:41:06.996: E/AndroidRuntime(7781):     at android.app.ActivityThread.main(ActivityThread.java:4867)
03-01 20:41:06.996: E/AndroidRuntime(7781):     at java.lang.reflect.Method.invokeNative(Native Method)
03-01 20:41:06.996: E/AndroidRuntime(7781):     at java.lang.reflect.Method.invoke(Method.java:511)
03-01 20:41:06.996: E/AndroidRuntime(7781):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1007)
03-01 20:41:06.996: E/AndroidRuntime(7781):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:774)
03-01 20:41:06.996: E/AndroidRuntime(7781):     at dalvik.system.NativeStart.main(Native Method)

Vi ringrazio sempre per anticipatamente per la disponibilità!