All geek questions in one place

Camera app not working?

I got the following stack trace

04-17 12:11:56.378: D/ATRecorder(10379): com.htc.autotest.dlib.RecordEngine in loader dalvik.system.DexClassLoader@40528b78 04-17 12:11:56.408: D/WindowManagerImpl(10379): addView, new view, mViews[0]: com.android.internal.policy.impl.PhoneWindow$DecorView@40520738 04-17 12:11:56.428: D/WindowManagerImpl(10379): addView, new view, mViews[1]: android.widget.LinearLayout@40525d00 04-17 12:11:56.438: D/WindowManagerImpl(10379): finishRemoveViewLocked, mViews[1]: android.widget.LinearLayout@40525d00 04-17 12:11:56.718: D/TAG(10379): Error setting camera preview: setPreviewDisplay failed 04-17 12:11:56.748: D/TAG(10379): Error starting camera preview: setPreviewDisplay failed 04-17 12:12:07.558: D/View(10379): onTouchEvent: viewFlags: 0x18004001 04-17 12:12:07.568: D/View(10379): onTouchEvent: isFocusable: true, isFocusableInTouchMode: false, isFocused: false; focusTaken: false 04-17 12:12:07.588: V/MediaRecorderJNI(10379): start 04-17 12:12:07.598: V/MediaRecorderJNI(10379): getMediaRecorder E 04-17 12:12:11.632: V/MediaRecorderJNI(10379): process_media_recorder_call 04-17 12:12:11.642: W/IMediaDeathNotifier(10379): media server died 04-17 12:12:11.642: V/MediaRecorderJNI(10379): JNIMediaRecorderListener::notify 04-17 12:12:11.642: V/MediaRecorderJNI(10379): notify msgType 0x1, ext1 0x64 04-17 12:12:11.642: W/Camera(10379): ICamera died 04-17 12:12:11.642: W/Camera(10379): Camera server died! 04-17 12:12:11.702: E/Camera(10379): Error 100

and my code

 public class VideoDemoActivity extends Activity { /** Called when the activity is first created. */ private Camera mCamera; private CameraPreview mPreview; private Button btnCapture,btnStop; private MediaRecorder mMediaRecorder; FrameLayout preview; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); initialize(); if (!checkCameraHardware(this)) { Toast.makeText(this, "Camera not found", Toast.LENGTH_SHORT).show(); finish(); } else { Toast.makeText(this, "Camera found", Toast.LENGTH_SHORT).show(); } mCamera = getCameraInstance(); mPreview = new CameraPreview(this, mCamera); preview.addView(mPreview); System.out.println(prepareVideoRecorder()); btnCapture.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub try { mMediaRecorder.start(); } catch (IllegalStateException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }); btnStop.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub mMediaRecorder.stop(); } }); } private void initialize() { // TODO Auto-generated method stub preview = (FrameLayout) findViewById(R.id.camera_preview); btnCapture = (Button) findViewById(R.id.button_capture); btnStop = (Button) findViewById(R.id.button_stop); } public Camera getCameraInstance(){ Camera c = null; try { c = Camera.open(); // attempt to get a Camera instance } catch (Exception e){ e.printStackTrace(); } return c; // returns null if camera is unavailable } private boolean checkCameraHardware(Context context) { if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)){ // this device has a camera return true; } else { // no camera on this device return false; } } @Override protected void onPause() { // TODO Auto-generated method stub super.onPause(); releaseMediaRecorder(); // if you are using MediaRecorder, release it first releaseCamera(); // release the camera immediately on pause event } private boolean prepareVideoRecorder(){ mMediaRecorder = new MediaRecorder(); mCamera.unlock(); mMediaRecorder.setCamera(mCamera); mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT); mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP); mMediaRecorder.setOutputFile(getOutputMediaFile().toString()); try { mMediaRecorder.prepare(); } catch (IllegalStateException e) { e.printStackTrace(); releaseMediaRecorder(); return false; } catch (IOException e) { e.printStackTrace(); releaseMediaRecorder(); return false; } return true; } private void releaseMediaRecorder(){ if (mMediaRecorder != null) { mMediaRecorder.reset(); // clear recorder configuration mMediaRecorder.release(); // release the recorder object mMediaRecorder = null; mCamera.lock(); // lock camera for later use } } private void releaseCamera(){ if (mCamera != null){ mCamera.release(); // release the camera for other applications mCamera = null; } } private static File getOutputMediaFile(){ File mediaFile = new File(Environment.getExternalStorageDirectory()+"/video.mp4"); return mediaFile; }

}

Therefore, please help me in solving this problem. If I remove the method

prepareVideoRecorder ()

then he previews the camera correctly. but after this method execution it does not show a preview .. and it fails

mMediaRecorder.start ();

please help me ..

+4
source share
2 answers

Before creating MediaRecorder you must unlock the camera. And block it before releasing it.

Try this code, it will work. Good luck ...

 package com.marcodinacci.book.acb; import java.io.IOException; import android.app.Activity; import android.content.pm.ActivityInfo; import android.hardware.Camera; import android.media.MediaRecorder; import android.os.Bundle; import android.view.Surface; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.view.View; import android.view.View.OnClickListener; import android.widget.ToggleButton; public class MediaRecorderRecipe extends Activity implements SurfaceHolder.Callback { private final String VIDEO_PATH_NAME = "/mnt/sdcard/VGA_30fps_512vbrate.mp4"; private MediaRecorder mMediaRecorder; private Camera mCamera; private SurfaceView mSurfaceView; private SurfaceHolder mHolder; private View mToggleButton; private boolean mInitSuccesful; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.media_recorder_recipe); // we shall take the video in landscape orientation setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); mSurfaceView = (SurfaceView) findViewById(R.id.surfaceView); mHolder = mSurfaceView.getHolder(); mHolder.addCallback(this); mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); mToggleButton = (ToggleButton) findViewById(R.id.toggleRecordingButton); mToggleButton.setOnClickListener(new OnClickListener() { @Override // toggle video recording public void onClick(View v) { if (((ToggleButton)v).isChecked()) { mMediaRecorder.start(); try { Thread.sleep(10 * 1000); } catch (Exception e) { e.printStackTrace(); } finish(); } else { mMediaRecorder.stop(); mMediaRecorder.reset(); try { initRecorder(mHolder.getSurface()); } catch (IOException e) { e.printStackTrace(); } } } }); } /* Init the MediaRecorder, the order the methods are called is vital to * its correct functioning */ private void initRecorder(Surface surface) throws IOException { // It is very important to unlock the camera before doing setCamera // or it will results in a black preview if(mCamera == null) { mCamera = Camera.open(); mCamera.unlock(); } if(mMediaRecorder == null) mMediaRecorder = new MediaRecorder(); mMediaRecorder.setPreviewDisplay(surface); mMediaRecorder.setCamera(mCamera); mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT); // mMediaRecorder.setOutputFormat(8); mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4); mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264); mMediaRecorder.setVideoEncodingBitRate(512 * 1000); mMediaRecorder.setVideoFrameRate(30); mMediaRecorder.setVideoSize(640, 480); mMediaRecorder.setOutputFile(VIDEO_PATH_NAME); try { mMediaRecorder.prepare(); } catch (IllegalStateException e) { // This is thrown if the previous calls are not called with the // proper order e.printStackTrace(); } mInitSuccesful = true; } @Override public void surfaceCreated(SurfaceHolder holder) { try { if(!mInitSuccesful) initRecorder(mHolder.getSurface()); } catch (IOException e) { e.printStackTrace(); } } @Override public void surfaceDestroyed(SurfaceHolder holder) { shutdown(); } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {} private void shutdown() { // Release MediaRecorder and especially the Camera as it a shared // object that can be used by other applications mMediaRecorder.reset(); mMediaRecorder.release(); mCamera.release(); // once the objects have been released they can't be reused mMediaRecorder = null; mCamera = null; } }

AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.marcodinacci.book.acb" android:versionCode="1" android:versionName="1.0"> <uses-sdk android:minSdkVersion="7" /> <uses-permission android:name="android.permission.CAMERA"/> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.RECORD_AUDIO" /> <uses-feature android:name="android.hardware.camera.autofocus" /> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name="MediaRecorderRecipe" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>

media_recorder_recipe.xml

 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <ToggleButton android:id="@+id/toggleRecordingButton" android:layout_width="fill_parent" android:textOff="Start Recording" android:textOn="Stop Recording" android:layout_height="wrap_content"/> <FrameLayout android:layout_width="fill_parent" android:layout_height="fill_parent"> <SurfaceView android:id="@+id/surfaceView" android:layout_width="fill_parent" android:layout_height="fill_parent"></SurfaceView> </FrameLayout> </LinearLayout>
+8
source

Did you grant permissions in the manifest?

 <uses-feature android:name="android.hardware.camera" /> <uses-permission android:name="android.permission.CAMERA" /> <uses-permission android:name = "android.permission.RECORD_AUDIO"/>
+1
source

Source: https://habr.com/ru/post/910458/

More articles:


All Articles