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POCrash android ViewPager + camera
 

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    <p>In my application I use <code>ViewPager</code>. I created a few blank pages. On a page preview <code>ViewPager</code> put the camera, as described in development.android.com. But when i try to run the application it fails. How to solve this problem ?</p> <pre><code>public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback { private SurfaceHolder mHolder; private Camera mCamera; public CameraPreview(Context context, Camera camera) { super(context); mCamera = camera; // Install a SurfaceHolder.Callback so we get notified when the // underlying surface is created and destroyed. mHolder = getHolder(); mHolder.addCallback(this); // deprecated setting, but required on Android versions prior to 3.0 mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); } public void surfaceCreated(SurfaceHolder holder) { // The Surface has been created, now tell the camera where to draw the preview. try { mCamera.setPreviewDisplay(holder); mCamera.startPreview(); } catch (IOException e) { } } public void surfaceDestroyed(SurfaceHolder holder) { // empty. Take care of releasing the Camera preview in your activity. } public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) { // If your preview can change or rotate, take care of those events here. // Make sure to stop the preview before resizing or reformatting it. if (mHolder.getSurface() == null){ // preview surface does not exist return; } // stop preview before making changes try { mCamera.stopPreview(); } catch (Exception e){ // ignore: tried to stop a non-existent preview } // set preview size and make any resize, rotate or // reformatting changes here // start preview with new settings try { mCamera.setPreviewDisplay(mHolder); mCamera.startPreview(); } catch (Exception e){ } } } </code></pre> <p>Main Activity:</p> <pre><code>public class CamActivity extends Activity { private List&lt;View&gt; mPages; private View mPage1; private View mPage2; private View mPage3; private Camera mCamera; private CameraPreview mPreview; private FrameLayout preview; private ViewPager mPager; private TitlePageIndicator mTitleIndicator; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); initUi(); mCamera = getCameraInstance(); mPreview = new CameraPreview(this, mCamera); } public static Camera getCameraInstance(){ Camera c = null; try { c = Camera.open(); // attempt to get a Camera instance } catch (Exception e){ // Camera is not available (in use or does not exist) } return c; // returns null if camera is unavailable } private void initUi() { LayoutInflater inflater = LayoutInflater.from(this); mPages = new ArrayList&lt;View&gt;(); mPage1 = inflater.inflate(R.layout.page1, null); mPage1.setTag(getString(R.string.capture)); mPage2 = inflater.inflate(R.layout.page2, null); mPage2.setTag(getString(R.string.text2)); mPage3 = inflater.inflate(R.layout.page3, null); mPage3.setTag(getString(R.string.text3)); mPages.add(mPage1); mPages.add(mPage2); mPages.add(mPage3); MainPageAdapter adapter = new MainPageAdapter(mPages); mPager = (ViewPager) findViewById(R.id.viewpager); mPager.setAdapter(adapter); mPager.setCurrentItem(0); mTitleIndicator = (TitlePageIndicator) findViewById(R.id.indicator); mTitleIndicator.setViewPager(mPager); mTitleIndicator.setCurrentItem(0); mTitleIndicator.setOnPageChangeListener(new ViewPager.OnPageChangeListener() { public void onPageSelected(int position) { Toast.makeText(CamActivity.this, "Changed to page " + position, Toast.LENGTH_SHORT).show(); if(position == 0) { preview = (FrameLayout) findViewById(R.id.camera_preview); preview.addView(mPreview); } } public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { } public void onPageScrollStateChanged(int state) { } }); } } </code></pre> <p>DDMS output:</p> <pre><code>05-10 09:15:44.696: D/dalvikvm(1135): GC_EXTERNAL_ALLOC freed 55K, 51% free 2682K/5379K, external 1541K/1559K, paused 775ms 05-10 09:15:47.746: D/gralloc_goldfish(1135): Emulator without GPU emulation detected. 05-10 09:19:54.329: D/AndroidRuntime(1135): Shutting down VM 05-10 09:19:54.329: W/dalvikvm(1135): threadid=1: thread exiting with uncaught exception (group=0xb68ad4f0) 05-10 09:19:54.410: E/AndroidRuntime(1135): FATAL EXCEPTION: main 05-10 09:19:54.410: E/AndroidRuntime(1135): java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first. 05-10 09:19:54.410: E/AndroidRuntime(1135): at android.view.ViewGroup.addViewInner(ViewGroup.java:1976) 05-10 09:19:54.410: E/AndroidRuntime(1135): at android.view.ViewGroup.addView(ViewGroup.java:1871) 05-10 09:19:54.410: E/AndroidRuntime(1135): at android.view.ViewGroup.addView(ViewGroup.java:1828) 05-10 09:19:54.410: E/AndroidRuntime(1135): at android.view.ViewGroup.addView(ViewGroup.java:1808) 05-10 09:19:54.410: E/AndroidRuntime(1135): at com.app.cam.CamActivity$1.onPageSelected(CamActivity.java:97) 05-10 09:19:54.410: E/AndroidRuntime(1135): at com.viewpagerindicator.TitlePageIndicator.onPageSelected(TitlePageIndicator.java:709) 05-10 09:19:54.410: E/AndroidRuntime(1135): at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:438) 05-10 09:19:54.410: E/AndroidRuntime(1135): at android.support.v4.view.ViewPager.onTouchEvent(ViewPager.java:1527) 05-10 09:19:54.410: E/AndroidRuntime(1135): at android.view.View.dispatchTouchEvent(View.java:3885) 05-10 09:19:54.410: E/AndroidRuntime(1135): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:903) 05-10 09:19:54.410: E/AndroidRuntime(1135): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942) 05-10 09:19:54.410: E/AndroidRuntime(1135): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942) 05-10 09:19:54.410: E/AndroidRuntime(1135): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942) 05-10 09:19:54.410: E/AndroidRuntime(1135): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942) 05-10 09:19:54.410: E/AndroidRuntime(1135): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1691) 05-10 09:19:54.410: E/AndroidRuntime(1135): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1125) 05-10 09:19:54.410: E/AndroidRuntime(1135): at android.app.Activity.dispatchTouchEvent(Activity.java:2096) 05-10 09:19:54.410: E/AndroidRuntime(1135): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1675) 05-10 09:19:54.410: E/AndroidRuntime(1135): at android.view.ViewRoot.deliverPointerEvent(ViewRoot.java:2194) 05-10 09:19:54.410: E/AndroidRuntime(1135): at android.view.ViewRoot.handleMessage(ViewRoot.java:1878) 05-10 09:19:54.410: E/AndroidRuntime(1135): at android.os.Handler.dispatchMessage(Handler.java:99) 05-10 09:19:54.410: E/AndroidRuntime(1135): at android.os.Looper.loop(Looper.java:130) 05-10 09:19:54.410: E/AndroidRuntime(1135): at android.app.ActivityThread.main(ActivityThread.java:3683) 05-10 09:19:54.410: E/AndroidRuntime(1135): at java.lang.reflect.Method.invokeNative(Native Method) 05-10 09:19:54.410: E/AndroidRuntime(1135): at java.lang.reflect.Method.invoke(Method.java:507) 05-10 09:19:54.410: E/AndroidRuntime(1135): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 05-10 09:19:54.410: E/AndroidRuntime(1135): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 05-10 09:19:54.410: E/AndroidRuntime(1135): at dalvik.system.NativeStart.main(Native Method) 05-10 09:20:02.030: I/Process(1135): Sending signal. PID: 1135 SIG: 9 </code></pre>
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