這是我的代碼,我試圖記錄視頻,當我打開應用程序,但它給了我錯誤,當我試圖打開應用程序....... 使用按鈕記錄視頻沒有問題,但是當我添加(啓動)方法時開始 給我的錯誤....如何在打開應用程序時自動錄製視頻?
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
}
}
}
,這是我的logcat:
7月1日至30日:42:20.244: D/AndroidRuntime(267):關閉VM
01-30 07:42:20.244:W/dalvikvm(267):threadid = 1:線程以未捕獲的異常退出(group = 0x4001d800)
01-30 07:42:20.254:E/AndroidRuntime ):致命異常:主
7月1日至30日:42:20.254:E/AndroidRuntime(267):了java.lang.RuntimeException:無法啓動活動 ComponentInfo {com.exercise.AndroidVideoCapture/com.exercise.AndroidVideoCapture .AndroidVideoCapture}:顯示java.lang.NullPointerException
7月1日至30日:42:20.254:E/AndroidRuntime(267):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
7月1日至三十○日:42:20.254:E/AndroidRuntime(267):在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
7月1日至三十○日:42:20.254:E/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)
7月1日至30日:42:20.254:E/AndroidRuntime(267):在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(Native Method )
7月1日至30日:42:20.254:E/AndroidRuntime(267):在java.lang.reflect.Method.invoke(Method.java:521)
7月1日至30日:42:20.254 :E/AndroidRuntime(267):at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.ja VA:868)
01-30 07:42:20.254:E/AndroidRuntime(267):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
01-30 07/42:20.254:E/AndroidRuntime(267):at dalvik.system.NativeStart.main(Native Method)
01-30 07:42:20.254:E/AndroidRuntime(267):引起:java。 lang.NullPointerException
01-30 07:42:20.254:E/AndroidRuntime(267):at com.exercise.AndroidVideoCapture.AndroidVideoCapture.prepareMediaRecorder(AndroidVideoCapture。的java:115)
7月1日至30日:42:20.254:E/AndroidRuntime(267):在com.exercise.AndroidVideoCapture.AndroidVideoCapture.onStart(AndroidVideoCapture.java:62)
7月1日至30日: 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:E/AndroidRuntime(267):at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2636)
7月1日至30日:42:20.254:E/AndroidRuntime(267):... 11更
7月1日至30日:42:23.314:I /方法(267):發送信號。 PID:267 SIG:9
我試圖刪除!但同樣的問題 – user3247851
1)我相信你應該忽略「!」無論如何 2)也許嘗試添加releaseCamera();在你的prepareMediaRecorder()onStart()方法 – gilonm
同樣的問題之前.....但是當我刪除onstart()方法的代碼工作正常,但使用onclick()方法,而我想自動錄製視頻時,我運行程序..... – user3247851