это мой код, который я пытался записать видео, когда открываю приложение, но он дает мне ошибку, когда я пытался открыть приложение ....... нет проблем с записью видео с помощью кнопки, но когда я добавить (при запуске) метод его запуска , чтобы дать мне эту ошибку ....как автоматически записывать видео при открытии приложения?
private Camera myCamera;
private MyCameraSurfaceView myCameraSurfaceView;
private MediaRecorder mediaRecorder;
Button myButton;
SurfaceHolder surfaceHolder;
boolean recording;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
recording = false;
setContentView(R.layout.main);
//Get Camera for preview
myCamera = getCameraInstance();
if(myCamera == null){
Toast.makeText(AndroidVideoCapture.this,
"Fail to get Camera",
Toast.LENGTH_LONG).show();
}
myCameraSurfaceView = new MyCameraSurfaceView(this, myCamera);
FrameLayout myCameraPreview = (FrameLayout)findViewById(R.id.videoview);
myCameraPreview.addView(myCameraSurfaceView);
myButton = (Button)findViewById(R.id.mybutton);
myButton.setOnClickListener(myButtonOnClickListener);
}
@Override
protected void onStart() {
// TODO Auto-generated method stub
super.onStart();
if(!prepareMediaRecorder()){
mediaRecorder.start();
}
}
Button.OnClickListener myButtonOnClickListener
= new Button.OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(recording){
// stop recording and release camera
mediaRecorder.stop(); // stop the recording
releaseMediaRecorder(); // release the MediaRecorder object
//Exit after saved
finish();
}else{
//Release Camera before MediaRecorder start
releaseCamera();
if(!prepareMediaRecorder()){
Toast.makeText(AndroidVideoCapture.this,
"Fail in prepareMediaRecorder()!\n - Ended -",
Toast.LENGTH_LONG).show();
finish();
}
mediaRecorder.start();
recording = true;
myButton.setText("STOP");
}
}};
private Camera getCameraInstance(){
// TODO Auto-generated method stub
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 boolean prepareMediaRecorder(){
myCamera = getCameraInstance();
mediaRecorder = new MediaRecorder();
myCamera.unlock();
mediaRecorder.setCamera(myCamera);
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
mediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));
mediaRecorder.setOutputFile("/sdcard/myvideo.mp4");
mediaRecorder.setMaxDuration(6000); // Set max duration 60 sec.
mediaRecorder.setMaxFileSize(5000000); // Set max file size 5M
mediaRecorder.setPreviewDisplay(myCameraSurfaceView.getHolder().getSurface());
try {
mediaRecorder.prepare();
} catch (IllegalStateException e) {
releaseMediaRecorder();
return false;
} catch (IOException e) {
releaseMediaRecorder();
return false;
}
return true;
}
@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 (mediaRecorder != null) {
mediaRecorder.reset(); // clear recorder configuration
mediaRecorder.release(); // release the recorder object
mediaRecorder = null;
myCamera.lock(); // lock camera for later use
}
}
private void releaseCamera(){
if (myCamera != null){
myCamera.release(); // release the camera for other applications
myCamera = null;
}
}
public class MyCameraSurfaceView extends SurfaceView implements SurfaceHolder.Callback{
private SurfaceHolder mHolder;
private Camera mCamera;
public MyCameraSurfaceView(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);
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int weight,
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 (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
}
// make any resize, rotate or reformatting changes here
// start preview with new settings
try {
mCamera.setPreviewDisplay(mHolder);
mCamera.startPreview();
} catch (Exception e){
}
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
// The Surface has been created, now tell the camera where to draw the preview.
try {
mCamera.setPreviewDisplay(holder);
mCamera.startPreview();
} catch (IOException e) {
}
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
}
}
}
и это мой LogCat:
01-30 07: 42: 20,244: D/AndroidRuntime (267): выключение VM
01-30 07: 42: 20,244: Вт/dalvikvm (267): ThreadId = 1: поток, выходящий с неперехваченным исключением (группа = 0x4001d800)
01-30 07: 42: 20,254: Е/AndroidRuntime (267): неустранимая: Главный
01-30 07: 42: 20,254: Е/AndroidRuntime (267): java.lang.RuntimeException: Невозможно запустить активность ComponentInfo {com.exercise.AndroidVideoCapture/com.exercise.AndroidVideoCapture .AndroidVideoCapture}: java.lang.NullPointerException
01-30 07: 42: 20,254: Е/AndroidRuntime (267): в android.app.ActivityThread.performLaunchActivity (ActivityThread.java:2663)
01-30 07: 42: 20,254: Е/AndroidRuntime (267): в android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:2679)
01-30 07: 42: 20,254: Е/AndroidRuntime (267): at android.app.ActivityThread.access $ 2300 (ActivityThread.java:125)
01-30 07: 42: 20.254: E/AndroidRuntime (267): at android.app.ActivityThread $ H.handleMessage (ActivityThread.java:2033)
01-30 07: 42: 20,254: Е/AndroidRuntime (267): в android.os.Handler.dispatchMessage (Handler.java:99)
01-30 07: 42: 20.254: E/AndroidRuntime (267): at android.os.Looper.loop (Looper.java:123)
01-30 07: 42: 20.254: E/AndroidRuntime (267)): at android.app.ActivityThread.main (ActivityThread.java:4627)
01-30 07: 42: 20.254: E/AndroidRuntime (267): at java.lang.reflect.Method.invokeNative (собственный метод)
01-30 07: 42: 20,254: Е/AndroidRuntime (267): в java.lang.reflect.Method.invoke (Method.java:521)
01-30 07: 42: 20,254 : E/AndroidRuntime (267): at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run (ZygoteInit.ja ва: 868)
01-30 07: 42: 20,254: Е/AndroidRuntime (267): в com.android.internal.os.ZygoteInit.main (ZygoteInit.java:626)
01-30 07: 42: 20.254: E/AndroidRuntime (267): at dalvik.system.NativeStart.main (родной метод)
01-30 07: 42: 20.254: E/AndroidRuntime (267): вызвано: java. lang.NullPointerException
01-30 07: 42: 20.254: E/AndroidRuntime (267): at com.exercise.AndroidVideoCapture.AndroidVideoCapture.prepareMediaRecorder (AndroidVideoCapture.Java: 115)
01-30 07: 42: 20,254: Е/AndroidRuntime (267): в com.exercise.AndroidVideoCapture.AndroidVideoCapture.onStart (AndroidVideoCapture.java:62)
01-30 07: 42: 20.254: E/AndroidRuntime (267): at android.app.Instrumentation.callActivityOnStart (Instrumentation.java:1129)
01-30 07: 42: 20.254: E/AndroidRuntime (267): at android.app .Activity.performStart (Activity.java:3781)
01-30 07: 42: 20,254: Е/AndroidRuntime (267): в android.app.ActivityThread.performLaunchActivity (ActivityThread.java:2636)
01-30 07: 42: 20,254: Е/AndroidRuntime (267): ... 11 подробнее
01-30 07: 42: 23,314 I/Процесс (267): Отправка сигнала. PID: 267 SIG: 9
я попытался удалить! но та же проблема – user3247851
1) Я уверен, что вы должны оставить «!» в любом случае 2) Возможно, попробуйте добавить releaseCamera(); перед вашей подготовкойMediaRecorder() в методе onStart() – gilonm
такая же проблема ..... но когда я удаляю метод onstart(), код работает нормально, но с помощью метода onclick(), когда я хочу автоматически записывать видео, когда я запускаю program ..... – user3247851