我正在将谷歌的录像机示例实现到我的应用程序中，代码如下所示
MediaRecorder recorder;
Camera mCamera;
SurfaceHolder holder;
boolean isRecording = false;
String TAG = "Evolution Camera";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
setContentView(R.layout.camera_view);
SurfaceView cameraView = (SurfaceView) findViewById(R.id.camera_preview);
// Add a listener to the Capture button
ImageButton captureButton = (ImageButton) findViewById(R.id.btn_capture);
captureButton.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
if (isRecording) {
// stop recording and release camera
recorder.stop(); // stop the recording
releaseMediaRecorder(); // release the MediaRecorder object
mCamera.lock(); // take camera access back from MediaRecorder
// inform the user that recording has stopped
// setCaptureButtonText("Capture");
isRecording = false;
} else {
// initialize video camera
if (prepareVideoRecorder()) {
// Camera is available and unlocked, MediaRecorder is prepared,
// now you can start recording
recorder.start();
// inform the user that recording has started
// setCaptureButtonText("Stop");
isRecording = true;
} else {
// prepare didn't work, release the camera
releaseMediaRecorder();
// inform user
}
}
}
});
Log.d(TAG, "Setting holders");
holder = cameraView.getHolder();
holder.addCallback(this);
Log.d(TAG, "Start preparing video recorder");
prepareVideoRecorder();
}
private boolean prepareVideoRecorder(){
// mCamera = getCameraInstance();
mCamera = Camera.open();
recorder = new MediaRecorder();
// Step 1: Unlock and set camera to MediaRecorder
mCamera.unlock();
recorder.setCamera(mCamera);
// Step 2: Set sources
recorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
// Step 3: Set a CamcorderProfile (requires API Level 8 or higher)
recorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));
// Step 4: Set output file
recorder.setOutputFile("/sdcard/videocapture_example.mp4");
// Step 5: Set the preview output
recorder.setPreviewDisplay(holder.getSurface());
// Step 6: Prepare configured MediaRecorder
try {
recorder.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;
}
public static Camera getCameraInstance(){
Camera c = null;
int cnum = 0;
int mCamSelect = 0;
Camera.CameraInfo caminfo = new CameraInfo();
try {
cnum = Camera.getNumberOfCameras();
Log.d("getCameraInstance", String.valueOf(cnum));
for(int i = 0;i<cnum;i++){
Camera.getCameraInfo(i, caminfo);
if(caminfo.facing == CameraInfo.CAMERA_FACING_FRONT){
mCamSelect = i;
break;
}
}
c = Camera.open(mCamSelect); // attempt to get a Camera instance
}
catch (Exception e){
Log.d("getCameraInstance", "FATAL camera could not be opened");
// Camera is not available (in use or does not exist)
}
if(c==null)Log.d("getCameraInstance", "no camera returned");
return c; // returns null if camera is unavailable
}
@Override
protected void onPause() {
super.onPause();
releaseMediaRecorder(); // if you are using MediaRecorder, release it first
releaseCamera(); // release the camera immediately on pause event
}
private void releaseMediaRecorder(){
if (recorder != null) {
recorder.reset(); // clear recorder configuration
recorder.release(); // release the recorder object
recorder = null;
mCamera.lock(); // lock camera for later use
}
}
private void releaseCamera(){
if (mCamera != null){
mCamera.release(); // release the camera for other applications
mCamera = null;
}
}
public void surfaceCreated(SurfaceHolder holder) {
prepareVideoRecorder();
}
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
}
public void surfaceDestroyed(SurfaceHolder holder) {
if (isRecording) {
recorder.stop();
isRecording = false;
}
recorder.release();
finish();
}
但是当我打开活动时，我会用这个日志强制关闭
04-09 21:58:57.357: D/dalvikvm(2539): GC_EXPLICIT freed 682K, 14% free 39798K/46128K, paused 10ms+6ms, total 49ms
04-09 21:58:57.740: D/Evolution Launcher(2539): Pausing
04-09 21:58:57.802: D/Evolution Camera(2539): Setting holders
04-09 21:58:57.802: D/Evolution Camera(2539): Start preparing video recorder
04-09 21:58:58.068: E/MediaRecorderJNI(2539): Application lost the surface
04-09 21:58:58.068: D/Evolution Camera(2539): IOException preparing MediaRecorder: invalid preview surface
04-09 21:58:58.201: D/AndroidRuntime(2539): Shutting down VM
04-09 21:58:58.201: W/dalvikvm(2539): threadid=1: thread exiting with uncaught exception (group=0x41356930)
04-09 21:58:58.232: E/AndroidRuntime(2539): FATAL EXCEPTION: main
04-09 21:58:58.232: E/AndroidRuntime(2539): java.lang.RuntimeException: Fail to connect to camera service
04-09 21:58:58.232: E/AndroidRuntime(2539): at android.hardware.Camera.native_setup(Native Method)
04-09 21:58:58.232: E/AndroidRuntime(2539): at android.hardware.Camera.<init>(Camera.java:340)
04-09 21:58:58.232: E/AndroidRuntime(2539): at android.hardware.Camera.open(Camera.java:317)
04-09 21:58:58.232: E/AndroidRuntime(2539): at com.doublep.evolution.EvoCamera.prepareVideoRecorder(EvoCamera.java:87)
04-09 21:58:58.232: E/AndroidRuntime(2539): at com.doublep.evolution.EvoCamera.surfaceCreated(EvoCamera.java:171)
04-09 21:58:58.232: E/AndroidRuntime(2539): at android.view.SurfaceView.updateWindow(SurfaceView.java:569)
04-09 21:58:58.232: E/AndroidRuntime(2539): at android.view.SurfaceView.access$000(SurfaceView.java:86)
04-09 21:58:58.232: E/AndroidRuntime(2539): at android.view.SurfaceView$3.onPreDraw(SurfaceView.java:174)
04-09 21:58:58.232: E/AndroidRuntime(2539): at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:680)
04-09 21:58:58.232: E/AndroidRuntime(2539): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1842)
04-09 21:58:58.232: E/AndroidRuntime(2539): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)
04-09 21:58:58.232: E/AndroidRuntime(2539): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)
04-09 21:58:58.232: E/AndroidRuntime(2539): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
04-09 21:58:58.232: E/AndroidRuntime(2539): at android.view.Choreographer.doCallbacks(Choreographer.java:562)
04-09 21:58:58.232: E/AndroidRuntime(2539): at android.view.Choreographer.doFrame(Choreographer.java:532)
04-09 21:58:58.232: E/AndroidRuntime(2539): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
04-09 21:58:58.232: E/AndroidRuntime(2539): at android.os.Handler.handleCallback(Handler.java:725)
04-09 21:58:58.232: E/AndroidRuntime(2539): at android.os.Handler.dispatchMessage(Handler.java:92)
04-09 21:58:58.232: E/AndroidRuntime(2539): at android.os.Looper.loop(Looper.java:137)
04-09 21:58:58.232: E/AndroidRuntime(2539): at android.app.ActivityThread.main(ActivityThread.java:5041)
04-09 21:58:58.232: E/AndroidRuntime(2539): at java.lang.reflect.Method.invokeNative(Native Method)
04-09 21:58:58.232: E/AndroidRuntime(2539): at java.lang.reflect.Method.invoke(Method.java:511)
04-09 21:58:58.232: E/AndroidRuntime(2539): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-09 21:58:58.232: E/AndroidRuntime(2539): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-09 21:58:58.232: E/AndroidRuntime(2539): at dalvik.system.NativeStart.main(Native Method)
04-09 21:59:34.802: D/Evolution Launcher(2539): Got location, location = Location[network 45.358237,10.737201 acc=20 et=+1d23h5m5s12ms {Bundle[mParcelledData.dataSize=600]}]
04-09 21:59:34.802: D/Evolution Launcher(2539): Getting longitude
04-09 21:59:34.802: D/Evolution Launcher(2539): Getting latitude
04-09 21:59:34.802: D/Evolution Launcher(2539): Getting altitude
04-09 21:59:34.990: W/dalvikvm(2539): threadid=11: thread exiting with uncaught exception (group=0x41356930)
04-09 21:59:34.990: I/Process(2539): Sending signal. PID: 2539 SIG: 9
这是我的清单
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
我忘了什么吗？
更新 camera_view.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Torch" >
<ImageButton
android:id="@+id/btn_capture"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="122dp"
android:src="@drawable/ic_launcher" />
<SurfaceView
android:id="@+id/camera_preview"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
更新 2 Logcat 更改后
04-09 22:37:13.959: D/dalvikvm(6124): GC_EXPLICIT freed 983K, 5% free 20350K/21360K, paused 3ms+8ms, total 46ms
04-09 22:37:15.646: D/Evolution Launcher(6124): Pausing
04-09 22:37:15.685: D/Evolution Camera(6124): Setting holders
04-09 22:37:15.685: D/Evolution Camera(6124): Start preparing video recorder
04-09 22:37:15.951: E/MediaRecorderJNI(6124): Application lost the surface
04-09 22:37:15.951: D/Evolution Camera(6124): IOException preparing MediaRecorder: invalid preview surface
04-09 22:37:16.513: D/Evolution Launcher(6124): Stopping
04-09 22:37:19.638: D/AndroidRuntime(6124): Shutting down VM
04-09 22:37:19.638: W/dalvikvm(6124): threadid=1: thread exiting with uncaught exception (group=0x41356930)
04-09 22:37:19.677: E/AndroidRuntime(6124): FATAL EXCEPTION: main
04-09 22:37:19.677: E/AndroidRuntime(6124): java.lang.RuntimeException: Fail to connect to camera service
04-09 22:37:19.677: E/AndroidRuntime(6124): at android.hardware.Camera.native_setup(Native Method)
04-09 22:37:19.677: E/AndroidRuntime(6124): at android.hardware.Camera.<init>(Camera.java:340)
04-09 22:37:19.677: E/AndroidRuntime(6124): at android.hardware.Camera.open(Camera.java:317)
04-09 22:37:19.677: E/AndroidRuntime(6124): at com.doublep.evolution.EvoCamera.prepareVideoRecorder(EvoCamera.java:88)
04-09 22:37:19.677: E/AndroidRuntime(6124): at com.doublep.evolution.EvoCamera.access$1(EvoCamera.java:85)
04-09 22:37:19.677: E/AndroidRuntime(6124): at com.doublep.evolution.EvoCamera$1.onClick(EvoCamera.java:60)
04-09 22:37:19.677: E/AndroidRuntime(6124): at android.view.View.performClick(View.java:4204)
04-09 22:37:19.677: E/AndroidRuntime(6124): at android.view.View$PerformClick.run(View.java:17355)
04-09 22:37:19.677: E/AndroidRuntime(6124): at android.os.Handler.handleCallback(Handler.java:725)
04-09 22:37:19.677: E/AndroidRuntime(6124): at android.os.Handler.dispatchMessage(Handler.java:92)
04-09 22:37:19.677: E/AndroidRuntime(6124): at android.os.Looper.loop(Looper.java:137)
04-09 22:37:19.677: E/AndroidRuntime(6124): at android.app.ActivityThread.main(ActivityThread.java:5041)
04-09 22:37:19.677: E/AndroidRuntime(6124): at java.lang.reflect.Method.invokeNative(Native Method)
04-09 22:37:19.677: E/AndroidRuntime(6124): at java.lang.reflect.Method.invoke(Method.java:511)
04-09 22:37:19.677: E/AndroidRuntime(6124): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-09 22:37:19.677: E/AndroidRuntime(6124): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-09 22:37:19.677: E/AndroidRuntime(6124): at dalvik.system.NativeStart.main(Native Method)
04-09 22:37:21.482: I/Process(6124): Sending signal. PID: 6124 SIG: 9
04-09 22:37:21.677: D/dalvikvm(6552): GC_CONCURRENT freed 64K, 2% free 9002K/9100K, paused 5ms+2ms, total 17ms
04-09 22:37:21.677: D/dalvikvm(6552): WAIT_FOR_CONCURRENT_GC blocked 6ms
04-09 22:37:21.724: D/dalvikvm(6552): GC_CONCURRENT freed 4K, 1% free 9434K/9516K, paused 2ms+2ms, total 16ms
04-09 22:37:21.724: D/dalvikvm(6552): WAIT_FOR_CONCURRENT_GC blocked 3ms
04-09 22:37:21.748: D/dalvikvm(6552): GC_FOR_ALLOC freed 2K, 1% free 9543K/9620K, paused 10ms, total 10ms
04-09 22:37:21.748: I/dalvikvm-heap(6552): Grow heap (frag case) to 11.206MB for 1952260-byte allocation
04-09 22:37:21.763: D/dalvikvm(6552): GC_FOR_ALLOC freed <1K, 1% free 11450K/11528K, paused 17ms, total 17ms
04-09 22:37:21.779: D/dalvikvm(6552): GC_CONCURRENT freed <1K, 1% free 11449K/11528K, paused 2ms+4ms, total 17ms
04-09 22:37:21.849: D/dalvikvm(6552): GC_FOR_ALLOC freed <1K, 1% free 11905K/11980K, paused 11ms, total 11ms
04-09 22:37:21.920: D/dalvikvm(6552): GC_FOR_ALLOC freed 1K, 1% free 12809K/12884K, paused 12ms, total 12ms
04-09 22:37:21.990: D/dalvikvm(6552): GC_FOR_ALLOC freed 1K, 1% free 13712K/13788K, paused 11ms, total 11ms
04-09 22:37:22.076: D/dalvikvm(6552): GC_FOR_ALLOC freed 2K, 1% free 15068K/15144K, paused 9ms, total 10ms
04-09 22:37:22.131: D/dalvikvm(6552): GC_FOR_ALLOC freed 2K, 1% free 16787K/16864K, paused 10ms, total 10ms
04-09 22:37:22.232: D/dalvikvm(6552): GC_CONCURRENT freed 111K, 1% free 19333K/19484K, paused 2ms+2ms, total 13ms
04-09 22:37:22.326: D/Evolution Launcher(6552): Loading variables
04-09 22:37:22.326: D/Evolution Launcher(6552): Restoring prefs
04-09 22:37:22.334: D/Evolution Launcher(6552): Screen density actions
04-09 22:37:22.349: D/Evolution Launcher- CarLocation(6552): Getting car location
04-09 22:37:22.357: D/Evolution Launcher(6552): Resuming
04-09 22:37:22.412: D/libEGL(6552): loaded /vendor/lib/egl/libEGL_POWERVR_SGX540_120.so
04-09 22:37:22.427: D/libEGL(6552): loaded /vendor/lib/egl/libGLESv1_CM_POWERVR_SGX540_120.so
04-09 22:37:22.427: D/libEGL(6552): loaded /vendor/lib/egl/libGLESv2_POWERVR_SGX540_120.so
04-09 22:37:22.537: D/OpenGLRenderer(6552): Enabling debug mode 0
04-09 22:37:24.920: D/dalvikvm(6552): GC_EXPLICIT freed 739K, 4% free 20266K/21032K, paused 2ms+6ms, total 45ms
04-09 22:37:27.357: D/dalvikvm(6552): GC_EXPLICIT freed 940K, 5% free 20349K/21320K, paused 3ms+9ms, total 45ms
04-09 22:37:29.677: D/dalvikvm(6552): GC_EXPLICIT freed 1046K, 6% free 20356K/21432K, paused 2ms+7ms, total 37ms