Registrazione Video

Salve, volevo mostrarvil il codice che voglio usare per registrare da fotocamera:
Funziona correnttamente ma ricevo un warning quando inizio la registrazione e un errore quando la tremino

Ecco il codice

package com.adelchi.prova;<br /> <br /> import java.io.IOException;<br /> <br /> import java.util.ArrayList;<br /> <br /> import java.util.List;<br /> <br /> import android.app.Activity;<br /> <br /> import android.hardware.Camera;<br /> import android.hardware.Camera.Size;<br /> <br /> import android.media.MediaRecorder;<br /> import android.os.Bundle;<br /> <br /> import android.util.Log;<br /> <br /> import android.view.SurfaceHolder;<br /> import android.view.SurfaceView;<br /> import android.view.View;<br /> <br /> import android.view.View.OnClickListener;<br /> import android.widget.ImageButton;<br /> <br /> public class prova extends Activity implements SurfaceHolder.Callback{<br /> <br /> private SurfaceView mSurfaceView;<br /> private SurfaceHolder mSurfaceHolder;<br /> private Camera mCamera;<br /> private boolean mPreviewRunning;<br /> <br /> private static final String TAG = "RECORD";<br /> <br /> public void onCreate(Bundle savedInstanceState) {<br /> super.onCreate(savedInstanceState);<br /> <br /> setContentView(R.layout.main);<br /> <br /> mSurfaceView = (SurfaceView)findViewById(R.id.camera_surface);<br /> mSurfaceHolder = mSurfaceView.getHolder();<br /> mSurfaceHolder.addCallback(this);<br /> mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);<br /> <br /> final ImageButton buttonPictureR = (ImageButton) findViewById(R.id.camera_surface_buttonR);<br /> final ImageButton buttonPictureS = (ImageButton) findViewById(R.id.camera_surface_buttonS);<br /> buttonPictureR.setOnClickListener(new OnClickListener(){<br /> public void onClick(View v) {<br /> <br /> startRecording();<br /> buttonPictureR.setVisibility(4);<br /> buttonPictureS.setVisibility(0);<br /> <br /> <br /> }<br /> });<br /> <br /> <br /> buttonPictureS.setOnClickListener(new OnClickListener(){<br /> public void onClick(View v) {<br /> <br /> stopRecording();<br /> buttonPictureR.setVisibility(0);<br /> buttonPictureS.setVisibility(4);<br /> <br /> }<br /> }); <br /> <br /> }<br /> <br /> public void surfaceCreated(SurfaceHolder holder) {<br /> <br /> mCamera = Camera.open();<br /> <br /> }<br /> <br /> public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {<br /> if (mPreviewRunning)<br /> mCamera.stopPreview();<br /> <br /> Camera.Parameters p = mCamera.getParameters();<br /> <br /> p.setPreviewSize(arg2, arg3);<br /> //p.setPreviewFormat(PixelFormat.JPEG);<br /> ArrayList<Size> list = (ArrayList<Size>) p.getSupportedPictureSizes(); <br /> List<String> list2 = p.getSupportedFocusModes();<br /> int picture_width = list.get(0).width;<br /> int picture_height = list.get(0).height;<br /> p.setFocusMode(list2.get(0));<br /> <br /> p.setPictureSize(picture_width, picture_height);<br /> <br /> mCamera.setParameters(p);<br /> try {<br /> <br /> System.out.println("sono fuori");<br /> <br /> mCamera.setPreviewDisplay(arg0); <br /> mCamera.startPreview();<br /> mPreviewRunning = true;<br /> } catch (IOException e) { }<br /> <br /> }<br /> <br /> public void surfaceDestroyed(SurfaceHolder holder) {<br /> <br /> mCamera.stopPreview();<br /> mPreviewRunning = false;<br /> mCamera.release();<br /> <br /> }<br /> <br /> private MediaRecorder mediaRecorder;<br /> private final int MAX_TIME = 20000;<br /> <br /> public boolean startRecording(){<br /> try {<br /> <br /> mediaRecorder = new MediaRecorder();<br /> mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);<br /> mediaRecorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);<br /> mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);<br /> mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);<br /> mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);<br /> mediaRecorder.setMaxDuration((int) MAX_TIME); <br /> mediaRecorder.setVideoSize(320, 240);<br /> mediaRecorder.setVideoFrameRate(20); <br /> mediaRecorder.setOutputFile("/sdcard/recordvideooutput.3gp");<br /> <br /> mediaRecorder.prepare();<br /> mediaRecorder.start();<br /> <br /> return true;<br /> } catch (IllegalStateException e) {<br /> Log.e(TAG,e.getMessage());<br /> e.printStackTrace();<br /> return false;<br /> } catch (IOException e) {<br /> Log.e(TAG,e.getMessage());<br /> e.printStackTrace();<br /> return false;<br /> }<br /> }<br /> <br /> public void stopRecording(){<br /> mediaRecorder.stop();<br /> mediaRecorder.release(); // Now the object cannot be reused<br /> }<br /> }

Questi sono gli errori quando premo il pulsante per registrare:

12-10 15:01:17.197: WARN/System.err(9068): java.io.IOException: prepare failed.

12-10 15:01:17.220: WARN/System.err(9068): at android.media.MediaRecorder._prepare(Native Method)
12-10 15:01:17.220: WARN/System.err(9068): at android.media.MediaRecorder.prepare(MediaRecorder. java:530)
12-10 15:01:17.220: WARN/System.err(9068): at com.adelchi.prova.prova.startRecording(prova.java: 136)
12-10 15:01:17.220: WARN/System.err(9068): at com.adelchi.prova.prova$1.onClick(prova.java:50)
12-10
15:01:17.220: WARN/System.err(9068): at android.view.View.performClick(View.java:2461)
12-10
15:01:17.220: WARN/System.err(9068): at android.view.View$PerformClick.run(View.java:8890)
12-10
15:01:17.220: WARN/System.err(9068): at android.os.Handler.handleCallback(Handler.java:587 )
12-10
15:01:17.220: WARN/System.err(9068): at android.os.Handler.dispatchMessage(Handler.java:92 )
12-10
15:01:17.224: WARN/System.err(9068): at android.os.Looper.loop(Looper.java:123)
12-10 15:01:17.224: WARN/System.err(9068): at android.app.ActivityThread.main(ActivityThread.jav a:4627)
12-10
15:01:17.224: WARN/System.err(9068): at java.lang.reflect.Method.invokeNative(Native Method)
12-10
15:01:17.224: WARN/System.err(9068): at java.lang.reflect.Method.invoke(Method.java:521)
12-10
15:01:17.224: WARN/System.err(9068): at com.android.internal.os.ZygoteInit$MethodAndArgsCa ller.run(ZygoteInit.java:871)
12-10
15:01:17.224: WARN/System.err(9068): at com.android.internal.os.ZygoteInit.main(ZygoteInit .java:629)
12-10 15:01:17.224: WARN/System.err(9068): at dalvik.system.NativeStart.main(Native Method)

Questo quando termino la registrazione

12-10 15:01:22.529: ERROR/AndroidRuntime(9068): FATAL EXCEPTION: main
12-10 15:01:22.529: ERROR/AndroidRuntime(9068): java.lang.IllegalStateException
12-10
15:01:22.529: ERROR/AndroidRuntime(9068): at android.media.MediaRecorder.stop(Native Method)
12-10
15:01:22.529: ERROR/AndroidRuntime(9068): at com.adelchi.prova.prova.stopRecording(prova.java:1 52)
12-10 15:01:22.529: ERROR/AndroidRuntime(9068): at com.adelchi.prova.prova$2.onClick(prova.java:62)
12-10 15:01:22.529: ERROR/AndroidRuntime(9068): at android.view.View.performClick(View.java:2461)
12-10
15:01:22.529: ERROR/AndroidRuntime(9068): at android.view.View$PerformClick.run(View.java:8890)
12-10 15:01:22.529: ERROR/AndroidRuntime(9068): at android.os.Handler.handleCallback(Handler.java:587 )
12-10 15:01:22.529: ERROR/AndroidRuntime(9068): at android.os.Handler.dispatchMessage(Handler.java:92 )
12-10 15:01:22.529: ERROR/AndroidRuntime(9068): at android.os.Looper.loop(Looper.java:123)
12-10
15:01:22.529: ERROR/AndroidRuntime(9068): at android.app.ActivityThread.main(ActivityThread.jav a:4627)
12-10 15:01:22.529: ERROR/AndroidRuntime(9068): at java.lang.reflect.Method.invokeNative(Native Method)
12-10 15:01:22.529: ERROR/AndroidRuntime(9068): at java.lang.reflect.Method.invoke(Method.java:521)
12-10 15:01:22.529: ERROR/AndroidRuntime(9068): at com.android.internal.os.ZygoteInit$MethodAndArgsCa ller.run(ZygoteInit.java:871)
12-10
15:01:22.529: ERROR/AndroidRuntime(9068): at com.android.internal.os.ZygoteInit.main(ZygoteInit .java:629)
12-10 15:01:22.529: ERROR/AndroidRuntime(9068): at dalvik.system.NativeStart.main(Native Method)
12-10
15:01:22.552: WARN/ActivityManager(2501): Force finishing activity com.adelchi.prova/.prova

Se qualcuno può illuminarmi.....