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BOOK: Professional Android 2 Application Development
This is the forum to discuss the Wrox book Professional Android 2 Application Development, 2nd Edition by Reto Meier; ISBN: 978-0-470-56552-0
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  #1 (permalink)  
Old June 18th, 2010, 07:29 AM
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Default Previewing VideoRecording Not working Listings 11-9 to 11-10

Hi I'm trying to get the Videorecording/previewing to work but i keep getting errors.

heres what i've done:

<uses-permission android:name="android.permission.RECORD_AUDIO"></uses-permission>
<uses-permission android:name="android.permission.RECORD_VIDEO"></uses-permission>
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
package se.rijad.android.nikita.ui;

import java.io.IOException;

import se.rijad.android.nikita.R;
import android.app.Activity;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.Window;

public class VideoCamera extends Activity implements SurfaceHolder.Callback
	private MediaRecorder mediaRecorder;
    /** Called when the activity is first created. */
    public void onCreate(Bundle savedInstanceState) {
        SurfaceView surface = (SurfaceView)findViewById(R.id.SurfaceView01);
        SurfaceHolder holder = surface.getHolder();
	public void surfaceCreated(SurfaceHolder holder) {
		if (mediaRecorder == null){
			try {
				//PREF THIS!
			} catch (IllegalArgumentException e) {
				Log.d("NIKITA{MEDIA_PLAYER}", e.getMessage());
			} catch (IllegalStateException e) {
				Log.d("NIKITA{MEDIA_PLAYER}", e.getMessage());
			} catch (IOException e) {
				Log.d("NIKITA{MEDIA_PLAYER}", e.getMessage());

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

	public void surfaceDestroyed(SurfaceHolder holder) {
06-18 14:11:46.495: ERROR/AndroidRuntime(3458): Uncaught handler: thread main exiting due to uncaught exception
06-18 14:11:46.505: ERROR/AndroidRuntime(3458): java.lang.RuntimeException: Unable to start activity ComponentInfo{se.rijad.android.nikita/se.rijad.android.nikita.ui.VideoCamera}: java.lang.NullPointerException
06-18 14:11:46.505: ERROR/AndroidRuntime(3458):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2596)
06-18 14:11:46.505: ERROR/AndroidRuntime(3458):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2621)
06-18 14:11:46.505: ERROR/AndroidRuntime(3458):     at android.app.ActivityThread.access$2200(ActivityThread.java:126)
06-18 14:11:46.505: ERROR/AndroidRuntime(3458):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1932)
06-18 14:11:46.505: ERROR/AndroidRuntime(3458):     at android.os.Handler.dispatchMessage(Handler.java:99)
06-18 14:11:46.505: ERROR/AndroidRuntime(3458):     at android.os.Looper.loop(Looper.java:123)
06-18 14:11:46.505: ERROR/AndroidRuntime(3458):     at android.app.ActivityThread.main(ActivityThread.java:4595)
06-18 14:11:46.505: ERROR/AndroidRuntime(3458):     at java.lang.reflect.Method.invokeNative(Native Method)
06-18 14:11:46.505: ERROR/AndroidRuntime(3458):     at java.lang.reflect.Method.invoke(Method.java:521)
06-18 14:11:46.505: ERROR/AndroidRuntime(3458):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
06-18 14:11:46.505: ERROR/AndroidRuntime(3458):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
06-18 14:11:46.505: ERROR/AndroidRuntime(3458):     at dalvik.system.NativeStart.main(Native Method)
06-18 14:11:46.505: ERROR/AndroidRuntime(3458): Caused by: java.lang.NullPointerException
06-18 14:11:46.505: ERROR/AndroidRuntime(3458):     at se.rijad.android.nikita.ui.VideoCamera.onCreate(VideoCamera.java:24)
06-18 14:11:46.505: ERROR/AndroidRuntime(3458):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
06-18 14:11:46.505: ERROR/AndroidRuntime(3458):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2544)
06-18 14:11:46.505: ERROR/AndroidRuntime(3458):     ... 11 more
SurfaceView surface = (SurfaceView)findViewById(R.id.surface);
	    SurfaceHolder holder = surface.getHolder();
24:	    holder.addCallback(this);  //Null? :(
	    holder.setFixedSize(400, 300);
please help.

Last edited by rinkle; June 18th, 2010 at 08:18 AM.
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  #2 (permalink)  
Old June 21st, 2010, 01:03 PM
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From a quick look, it appears I've missed a line of code. The mediaRecorder variable is never being initialized.

Try adding:
mediaRecorder = new MediaRecorder();
Immediately before modifying the mediaRecorder parameters within the surfaceCreated method.
Reto Meier

Author, "Professional Android 4 Application Development", Wrox, ©2012, 2010, 2008
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