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PO.setPreviewDisplay(holder) creating NullPointer exception
 

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    <p>I have created a custom camera application and it works perfectly fine on almost all devices but it seems to be crashing on devices listed as <strong>other</strong> in the developer portal. These users are all giving me bad reviews I would like to solve this problem but it is very hard for me to figure it out, because it works perfectly on all the devices I own.</p> <p><code>camera.setPreviewDisplay(holder);</code> is what is causing the error and it is occurring when the app launches.`</p> <pre><code>public class CamPreview extends SurfaceView implements SurfaceHolder.Callback { SurfaceHolder holder; Camera camera; private List&lt;Camera.Size&gt; sizes; public CamPreview(Context context, Camera camera) { super(context); this.camera = camera; holder = this.getHolder(); holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); holder.addCallback(this); } private Camera.Size getBestPreviewSize(int width, int height) { Camera.Size result=null; Camera.Parameters p = camera.getParameters(); for (Camera.Size size : p.getSupportedPreviewSizes()) { if (size.width&lt;=width &amp;&amp; size.height&lt;=height) { if (result==null) { result=size; } else { int resultArea=result.width*result.height; int newArea=size.width*size.height; if (newArea&gt;resultArea) { result=size; } } } } return result; } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { if (holder.getSurface() == null) return; Camera.Parameters parameters = camera.getParameters(); sizes = parameters.getSupportedPreviewSizes(); Camera.Size optimalSize = getBestPreviewSize(width, height); try{ parameters.setPreviewSize(optimalSize.width,optimalSize.height); camera.setParameters(parameters); } catch (NullPointerException a) { } camera.startPreview(); } @Override public void surfaceCreated(SurfaceHolder holder) { try { camera.setPreviewDisplay(holder); } catch (IOException e) { camera.release(); camera=null; Log.d("FrontCam", "Error creating surface: " + e.getMessage()); } } @Override public void surfaceDestroyed(SurfaceHolder holder) { if (camera != null) { camera.stopPreview(); camera.setPreviewCallback(null); camera.release(); } } } </code></pre> <p>logcat:</p> <pre><code> java.lang.NullPointerException at com.me.frontcam.CamPreview.surfaceCreated(CamPreview.java:136) at android.view.SurfaceView.updateWindow(SurfaceView.java:552) at android.view.SurfaceView.dispatchDraw(SurfaceView.java:350) at android.view.ViewGroup.drawChild(ViewGroup.java:1644) at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373) at android.view.ViewGroup.drawChild(ViewGroup.java:1644) at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373) at android.view.ViewGroup.drawChild(ViewGroup.java:1644) at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373) at android.view.View.draw(View.java:6883) at android.widget.FrameLayout.draw(FrameLayout.java:357) at android.view.ViewGroup.drawChild(ViewGroup.java:1646) at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373) at android.view.View.draw(View.java:6883) at android.widget.FrameLayout.draw(FrameLayout.java:357) at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:1921) at android.view.ViewRoot.draw(ViewRoot.java:1528) at android.view.ViewRoot.performTraversals(ViewRoot.java:1264) at android.view.ViewRoot.handleMessage(ViewRoot.java:1866) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:130) at android.app.ActivityThread.main(ActivityThread.java:3687) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:507) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625) at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>how I open the camera</p> <pre><code>void initCamera() { //check for front camera if(Camera.getNumberOfCameras()&gt;1) { camera= Camera.open(1); try { camera.cancelAutoFocus(); } catch (RuntimeException a) { } try{ camera.setDisplayOrientation(90); } catch (NullPointerException a) { camera.setDisplayOrientation(90); } } else { new AlertDialog.Builder(this) .setTitle("Sorry but you cant use this app") .setMessage("You do not have a front camera") .setPositiveButton("Quit", new DialogInterface.OnClickListener() { //Quits application public void onClick(DialogInterface dialog, int which) { finish(); } }) .show(); } } </code></pre> <p>I then call the initUI method where the CamPreview constructor is called</p> <pre><code>void initUI() { white= new ImageView(this); imgShoot = (ImageButton) findViewById(R.id.imgShoot); imgShoot.setOnClickListener(imgShootOnClick); frmPreview = (FrameLayout) findViewById(R.id.frmPreview); preview = new CamPreview(this, camera); frmPreview.addView(white); white.setImageResource(R.drawable.aperture_opening); frmPreview.addView(preview); frmPreview.bringChildToFront(preview); } </code></pre> <p>Ive looked at both of these and they did not solve my problem <a href="https://stackoverflow.com/questions/6825129/android-cam-setpreviewdisplayholder-running-into-ioerror">Android - cam.setPreviewDisplay(holder) running into IOError</a></p> <p><a href="https://stackoverflow.com/questions/8984542/setpreviewdisplayholder-throwing-null-pointer-exception?lq=1">.setPreviewDisplay(holder) throwing null pointer exception</a></p> <p>Any help appreciated greatly!</p>
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