Update1：现在代码在将代码更改为下面后会出现此错误：
02-20 10:43:13.624: W/System.err(5494): java.lang.RuntimeException: start failed.
02-20 10:43:13.624: W/System.err(5494): at android.media.MediaRecorder.start(Native Method)
02-20 10:43:13.624: W/System.err(5494): at fun.audios.maker.VideoRecorderActivity.startRecording(VideoRecorderActivity.java:237)
02-20 10:43:13.624: W/System.err(5494): at fun.audios.maker.VideoRecorderActivity.access$9(VideoRecorderActivity.java:146)
02-20 10:43:13.624: W/System.err(5494): at fun.audios.maker.VideoRecorderActivity$1.onClick(VideoRecorderActivity.java:88)
02-20 10:43:13.624: W/System.err(5494): at android.view.View.performClick(View.java:3620)
02-20 10:43:13.624: W/System.err(5494): at android.widget.CompoundButton.performClick(CompoundButton.java:107)
02-20 10:43:13.624: W/System.err(5494): at android.view.View$PerformClick.run(View.java:14292)
02-20 10:43:13.624: W/System.err(5494): at android.os.Handler.handleCallback(Handler.java:605)
02-20 10:43:13.624: W/System.err(5494): at android.os.Handler.dispatchMessage(Handler.java:92)
02-20 10:43:13.624: W/System.err(5494): at android.os.Looper.loop(Looper.java:137)
02-20 10:43:13.624: W/System.err(5494): at android.app.ActivityThread.main(ActivityThread.java:4512)
02-20 10:43:13.624: W/System.err(5494): at java.lang.reflect.Method.invokeNative(Native Method)
02-20 10:43:13.624: W/System.err(5494): at java.lang.reflect.Method.invoke(Method.java:511)
02-20 10:43:13.624: W/System.err(5494): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:982)
02-20 10:43:13.624: W/System.err(5494): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:749)
02-20 10:43:13.624: W/System.err(5494): at dalvik.system.NativeStart.main(Native Method)
代码更改为：
private void startRecording()
{
mrec = new MediaRecorder();
mCamera.unlock();
mrec.setCamera(mCamera);
mrec.setAudioSource(MediaRecorder.AudioSource.MIC);
mrec.setVideoSource(MediaRecorder.VideoSource.CAMERA);
mrec.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
mrec.setVideoFrameRate(15); //this line removed comment
mrec.setVideoSize(720, 480);
Method[] methods = mrec.getClass().getMethods();
for (Method method: methods){
try
{
if(method.getName().equals("setAudioEncodingBitRate"))
{
method.invoke(mrec,12200);
}
else if(method.getName().equals("setVideoEncodingBitRate"))
{
method.invoke(mrec, 3000000);
}
else if(method.getName().equals("setAudioSamplingRate"))
{
method.invoke(mrec,8000);
}
else if(method.getName().equals("setVideoFrameRate"))
{
method.invoke(mrec,24);
}
}
catch (IllegalArgumentException e)
{
e.printStackTrace();
}
catch (IllegalAccessException e)
{
e.printStackTrace();
}
catch (InvocationTargetException e)
{
e.printStackTrace();
}
catch (RuntimeException e)
{
Log.d("errorrrrrrrrr runtime111111111", "okkkkkkkkkk");
e.printStackTrace();
}
}
mrec.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
mrec.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
mrec.setPreviewDisplay(surfaceHolder.getSurface());
mrec.setOrientationHint(90);
mrec.setOutputFile(Videopath);
try
{
mrec.prepare();
}
catch (IllegalStateException e)
{
// releaseRecorder();
// return false;
}
catch (IOException e)
{
// releaseRecorder();
// return false;
}
catch (RuntimeException e)
{
e.printStackTrace();
}
catch(Exception e)
{
// return false;
}
try
{
mrec.start();
}
catch (RuntimeException e)
{
Log.d("errorrrrrrrrr runtime44444444444", "okkkkkkkkkk");
e.printStackTrace();
}
catch(Exception e)
{
// return false;
Log.d("errorrrrrrrrr 33333333333", "okkkkkkkkkk");
}
isRecording=true;
// return true;
}
允许者像这样添加：
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.screen.portrait" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-permission android:name="android.permission.RECORD_VIDEO"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS"/>this is my
/我是安卓新手，有这个代码来捕获视频.大部分代码是根据相机中的安卓开发人员指南用户。但是给了我异常运行时异常：无法连接到相机服务。我的哪一行代码有错误？整个日志在这里：
02-20 05:42:56.054: W/System.err(4991): java.lang.RuntimeException: Fail to connect to camera service
W/System.err(4991): at android.hardware.Camera.native_setup(Native Method)
02-20 05:42:56.054: W/System.err(4991): at android.hardware.Camera.<init>(Camera.java:344)
02-20 05:42:56.054: W/System.err(4991): at android.hardware.Camera.open(Camera.java:321)
02-20 05:42:56.054: W/System.err(4991): at fun.audios.maker.VideoRecorderActivity.startRecording(VideoRecorderActivity.java:144)
02-20 05:42:56.054: W/System.err(4991): at fun.audios.maker.VideoRecorderActivity.access$9(VideoRecorderActivity.java:142)
02-20 05:42:56.054: W/System.err(4991): at fun.audios.maker.VideoRecorderActivity$1.onClick(VideoRecorderActivity.java:86)
02-20 05:42:56.054: W/System.err(4991): at android.view.View.performClick(View.java:3620)
02-20 05:42:56.054: W/System.err(4991): at android.widget.CompoundButton.performClick(CompoundButton.java:107)
02-20 05:42:56.054: W/System.err(4991): at android.view.View$PerformClick.run(View.java:14292)
02-20 05:42:56.054: W/System.err(4991): at android.os.Handler.handleCallback(Handler.java:605)
02-20 05:42:56.054: W/System.err(4991): at android.os.Handler.dispatchMessage(Handler.java:92)
02-20 05:42:56.054: W/System.err(4991): at android.os.Looper.loop(Looper.java:137)
02-20 05:42:56.054: W/System.err(4991): at android.app.ActivityThread.main(ActivityThread.java:4512)
02-20 05:42:56.054: W/System.err(4991): at java.lang.reflect.Method.invokeNative(Native Method)
02-20 05:42:56.054: W/System.err(4991): at java.lang.reflect.Method.invoke(Method.java:511)
02-20 05:42:56.054: W/System.err(4991): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:982)
02-20 05:42:56.054: W/System.err(4991): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:749)
02-20 05:42:56.054: W/System.err(4991): at dalvik.system.NativeStart.main(Native Method)
02-20 05:42:56.054: D/errorrrrrrrrr runtime(4991): okkkkkkkkkk
这是我的代码：
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.recorder_video);
InitializeUI();
//button for start and stop recording calls
}
private void startRecording()
{
//mCamera = getCameraInstance();
mrec = new MediaRecorder();
mCamera.unlock();
mrec.setCamera(mCamera);
mrec.setAudioSource(MediaRecorder.AudioSource.MIC);
mrec.setVideoSource(MediaRecorder.VideoSource.CAMERA);
mrec.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
// mrec.setVideoFrameRate(15);
mrec.setVideoSize(720, 480);
Method[] methods = mrec.getClass().getMethods();
for (Method method: methods){
try
{
if(method.getName().equals("setAudioEncodingBitRate"))
{
method.invoke(mrec,12200);
}
else if(method.getName().equals("setVideoEncodingBitRate"))
{
method.invoke(mrec, 3000000);
}
else if(method.getName().equals("setAudioSamplingRate"))
{
method.invoke(mrec,8000);
}
else if(method.getName().equals("setVideoFrameRate"))
{
method.invoke(mrec,24);
}
}
catch (IllegalArgumentException e)
{
e.printStackTrace();
}
catch (IllegalAccessException e)
{
e.printStackTrace();
}
catch (InvocationTargetException e)
{
e.printStackTrace();
}
catch (RuntimeException e)
{
Log.d("errorrrrrrrrr runtime111111111", "okkkkkkkkkk");
e.printStackTrace();
}
}
mrec.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
mrec.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
mrec.setPreviewDisplay(surfaceHolder.getSurface());
mrec.setOrientationHint(90);
mrec.setOutputFile(Videopath);
try
{
mrec.prepare();
}
catch (IllegalStateException e)
{
// releaseRecorder();
// return false;
}
catch (IOException e)
{
// releaseRecorder();
// return false;
}
catch (RuntimeException e)
{
e.printStackTrace();
}
catch(Exception e)
{
// return false;
}
try
{
mrec.start();
}
catch (RuntimeException e)
{
Log.d("errorrrrrrrrr runtime44444444444", "okkkkkkkkkk");
e.printStackTrace();
}
catch(Exception e)
{
// return false;
Log.d("errorrrrrrrrr 33333333333", "okkkkkkkkkk");
}
isRecording=true;
// return true;
}
//-------------------------------------------------------------
/** A safe way to get an instance of the Camera object. */
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 stopRecording()
{
if(isRecording)
{
mrec.stop(); // stop the recording
releaseRecorder(); // release the MediaRecorder object
btnlistToggle.setEnabled(true);
isRecording=false;
}
}
//-------------------------------------------------------------
// release the recorder after recording
private void releaseRecorder()
{
if (mrec != null) {
mrec.reset(); // clear recorder configuration
mrec.release(); // release the recorder object
mrec = null;
mCamera.lock(); // lock camera for later use
}
}
//-------------------------------------------------------------
// release the camera after recording
private void releaseCamera()
{
if (mCamera != null)
{
mCamera.release(); // release the camera for other applications
mCamera = null;
}
}
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height)
{
// 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 (holder.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(holder);
mCamera.startPreview();
}
catch (Exception e)
{
// Log.d(TAG, "Error starting camera preview: " + e.getMessage());
}
}
//-------------------------------------------------------------
@Override
public void surfaceCreated(SurfaceHolder holder)
{
if (mCamera != null)
{
Parameters params = mCamera.getParameters();
mCamera.setParameters(params);
mCamera.setDisplayOrientation(90);
try
{
mCamera .setPreviewDisplay(holder);
mCamera .startPreview();
}
catch (IOException e)
{
e.printStackTrace();
}
}
else
{
Toast.makeText(getApplicationContext(), "Camera not available!", Toast.LENGTH_LONG).show();
VideoRecorderActivity.this.finish();
}
}
//-------------------------------------------------------------
@Override
public void surfaceDestroyed(SurfaceHolder holder)
{
}
protected void onPause()
{
datasource.close();
super.onPause();
//if(mrec != null)
//{
releaseRecorder(); // if you are using MediaRecorder, release it first
releaseCamera(); // release the camera immediately on pause event
//}
}
private void InitializeUI()
{
// Create an instance of Camera
mCamera = Camera.open();
mCamera.lock();
surfaceView = (SurfaceView) findViewById(R.id.surface_camera);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
mToggleButton = (ToggleButton) findViewById(R.id.toggleRecordingButton);
}
这是我的XML布局。
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:layout_gravity="center_horizontal">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_gravity="center_horizontal" android:background="@drawable/bg_header_footers">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal" android:paddingTop="2dp">
<TextView
android:id="@+id/tvSetNameRecorder"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:textColor="@color/White"
android:textSize="18dp"
android:textStyle="bold"
android:text="Make your Video!"
android:layout_gravity="center"/>
</LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content" android:layout_gravity="center_horizontal">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/tvTimer1"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:gravity="center"
android:textColor="@color/Lightgray"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textStyle="bold"
android:text="00:00:00"/>
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="10dp">
<ImageView
android:id="@+id/imgcheshmak1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/cheshmak"
android:visibility="gone"/>
</LinearLayout>
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1">
<SurfaceView
android:id="@+id/surface_camera"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
<TableLayout
android:gravity="center_horizontal"
android:id="@+id/linerlistandback"
android:layout_width="match_parent"
android:layout_gravity="center"
android:layout_centerHorizontal="true"
android:layout_height="wrap_content">
<TableRow
android:layout_gravity="center_horizontal"
android:gravity="center"
android:layout_height="wrap_content"
android:layout_width="match_parent">
<LinearLayout
android:layout_height="wrap_content"
android:layout_width="0dp" android:layout_weight="1" android:paddingRight="2dp">
<Button
android:id="@+id/btnToggleListVideo"
android:layout_width="0dp"
android:layout_height="40dp"
android:background="@drawable/selector_button"
android:drawableLeft="@drawable/listtttt"
android:paddingLeft="30dp"
android:paddingRight="20dp"
android:layout_weight="1"
android:textSize="20dp" android:text="List"/>
</LinearLayout>
<LinearLayout
android:layout_height="wrap_content"
android:layout_width="0dp"
android:layout_weight="1" android:paddingLeft="2dp">
<ToggleButton
android:id="@+id/toggleRecordingButton"
android:layout_width="0dp"
android:textOff="Start"
android:textOn="Stop"
android:background="@drawable/selector_button"
android:layout_height="40dp"
android:drawableLeft="@drawable/camera"
android:paddingLeft="30dp"
android:paddingRight="20dp" android:layout_weight="1" android:textSize="20dp"/>
</LinearLayout>
</TableRow>
</TableLayout>
</LinearLayout>
我想知道您是否添加了适当的权限。您必须在Menifest中添加权限。
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
使用相机时，如果相机与其他应用程序连接，则无法使用相机（可能会导致无法连接相机服务）。
因此，您必须确保只有您的应用程序使用相机服务。
我希望你能纠正你的错误
再见！
根据您的崩溃日志
02-20 05:42:56.054: W/System.err(4991): java.lang.RuntimeException: Fail to connect to camera service
W/System.err(4991): at android.hardware.Camera.native_setup(Native Method)
02-20 05:42:56.054: W/System.err(4991): at android.hardware.Camera.<init>(Camera.java:344)
02-20 05:42:56.054: W/System.err(4991): at android.hardware.Camera.open(Camera.java:321)
02-20 05:42:56.054: W/System.err(4991): at fun.audios.maker.VideoRecorderActivity.startRecording(VideoRecorderActivity.java:144)
，则无法在媒体录像机中成功打开摄像机。
您可以阅读安卓教程 - 捕获视频法典：
private boolean prepareVideoRecorder(){
mCamera = getCameraInstance();
mMediaRecorder = new MediaRecorder();
// Step 1: Unlock and set camera to MediaRecorder
mCamera.unlock();
mMediaRecorder.setCamera(mCamera);
// Step 2: Set sources
mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
// Step 3: Set a CamcorderProfile (requires API Level 8 or higher)
mMediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));
// Step 4: Set output file
mMediaRecorder.setOutputFile(getOutputMediaFile(MEDIA_TYPE_VIDEO).toString());
// Step 5: Set the preview output
mMediaRecorder.setPreviewDisplay(mPreview.getHolder().getSurface());
// Step 6: Prepare configured MediaRecorder
try {
mMediaRecorder.prepare();
} catch (IllegalStateException e) {
Log.d(TAG, "IllegalStateException preparing MediaRecorder: " + e.getMessage());
releaseMediaRecorder();
return false;
} catch (IOException e) {
Log.d(TAG, "IOException preparing MediaRecorder: " + e.getMessage());
releaseMediaRecorder();
return false;
}
return true;
}
如果代码无法正常工作，则应该是您的ROM问题。
您似乎没有使用相机服务的正确权限。尝试将其添加到清单文件中：
编辑：它对我有用！我使用了与您相同的代码，我知道我以前说过，但请检查您的权限：
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.screen.portrait" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
最后我找到了解决方案。我删除了一部分代码，然后启动失败错误没有发生。我将代码更改为：
private void startRecording()
{
mrec = new MediaRecorder();
mCamera.unlock();
mrec.setCamera(mCamera);
mrec.setAudioSource(MediaRecorder.AudioSource.MIC);
mrec.setVideoSource(MediaRecorder.VideoSource.CAMERA);
mrec.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
mrec.setVideoFrameRate(15);
mrec.setVideoSize(720, 480);
mrec.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
mrec.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);
mrec.setPreviewDisplay(surfaceHolder.getSurface());
mrec.setOrientationHint(90);
mrec.setOutputFile(Videopath);
try
{
mrec.prepare();
mrec.start();
}
catch (IllegalStateException e)
{
// releaseRecorder();
// return false;
}
catch (IOException e)
{
// releaseRecorder();
// return false;
}
catch (RuntimeException e)
{
e.printStackTrace();
}
catch(Exception e)
{
// return false;
}
}
我想调用方法的参数值在设置时有问题。如果你有一些更好的反应旋转，使质量更好，比如我的调用方法，请发布你的回复，以帮助我和其他人阅读这篇文章。