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Mediarecorder.start（）oncreateで動作しません

2016-04-04 1 views
0

イベントリスナーで開始するのではなく、このレコーディングアクティビティに変更すると、カメラがビデオレコーダーを開始します。しかし、私がそれをoncreateで実行しようとすると、それは一度クラッシュして、それが想定どおりに動作します。 MediaRecorder.start（）およびmyCamera.unlockでエラーが発生します。これをどのようにデバッグできますか？最初の例外についてはMediarecorder.start（）oncreateで動作しません

package com.abacus.surveillance; 

import android.app.Activity; 
import android.content.Intent; 
import android.media.MediaRecorder; 
import android.os.Bundle; 
import android.provider.MediaStore; 
import android.support.design.widget.FloatingActionButton; 
import android.support.design.widget.Snackbar; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.Toolbar; 
import android.util.Log; 
import android.view.SurfaceHolder; 
import android.view.View; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.WindowManager; 
import java.io.IOException; 


import android.app.Activity; 
import android.content.Context; 
import android.hardware.Camera; 
import android.media.CamcorderProfile; 
import android.media.MediaRecorder; 
import android.os.Bundle; 
import android.view.SurfaceHolder; 
import android.view.SurfaceView; 
import android.view.View; 
import android.widget.Button; 
import android.widget.FrameLayout; 
import android.widget.Toast; 
import android.os.Handler; 


public class RecordActivity extends AppCompatActivity { 

    private static Camera myCamera; 
    private MyCameraSurfaceView myCameraSurfaceView; 
    private MediaRecorder mediaRecorder; 

    Button myButton; 
    Button restore; 
    SurfaceHolder surfaceHolder; 
    boolean recording; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     recording = false; 

     setContentView(R.layout.activity_record); 

     //Get Camera for preview 
     myCamera = getCameraInstance(); 

     if(myCamera == null){ 
      Log.d("ON Create","Failed to get camera"); 
     } else { 
      Log.d("ON Create","Got camera"); 
     } 

     myCameraSurfaceView = new MyCameraSurfaceView(this, myCamera); 
     FrameLayout myCameraPreview = (FrameLayout)findViewById(R.id.videoview); 
     myCameraPreview.addView(myCameraSurfaceView); 

     myButton = (Button)findViewById(R.id.mybutton); 
     restore = (Button)findViewById(R.id.restorebtn); 
     myButton.setOnClickListener(myButtonOnClickListener); 

     restore.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       startActivity(new Intent(RecordActivity.this, MainActivity.class)); 
      } 
     }); 


     Handler handler = new Handler(); 
     handler.postDelayed(new Runnable() { 
      @Override 
      public void run() { 
       startRecord(); 
      } 
     }, 3000); 
    } 

    Button.OnClickListener myButtonOnClickListener 
      = new Button.OnClickListener(){ 

     @Override 
     public void onClick(View v) { 

      startRecord(); 
      } 

     }; 

    private void startRecord(){ 
     if(recording){ 

      try{ 
       mediaRecorder.stop(); 
       releaseMediaRecorder(); 
       //finish(); 
       myButton.setText("REC"); 
      }catch(Exception e){ 
       e.printStackTrace(); 
      } 

     }else{ 

      releaseCamera(); 

      if(!prepareMediaRecorder()){ 
       Toast.makeText(RecordActivity.this, 
         "Fail in prepareMediaRecorder()!\n - Ended -", 
         Toast.LENGTH_LONG).show(); 
       finish(); 
      } 

      mediaRecorder.start(); 
      Log.d("start", "started"); 
      recording = true; 
      myButton.setText("STOP"); 
     } 
    } 

    private Camera getCameraInstance(){ 

     Camera c = null; 
     try { 
      c = Camera.open(); 
      Log.d("open", "open"); 
     } 
     catch (Exception e){ 
      Log.d("notopen", "notopen"); 
      Log.e("camera", e.getMessage()); 
     } 
     return c; 
    } 

    private boolean prepareMediaRecorder(){ 
     Log.d("prep", "prepcamera"); 
     myCamera = getCameraInstance(); 

     mediaRecorder = new MediaRecorder(); 

     myCamera.unlock(); 

     //myCamera.setDisplayOrientation(90); 

     mediaRecorder.setCamera(myCamera); 

     mediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER); 
     mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA); 

     mediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_480P)); 

     mediaRecorder.setOutputFile("/sdcard/myvideo.mp4"); 
     mediaRecorder.setMaxDuration(60000); 

     mediaRecorder.setPreviewDisplay(myCameraSurfaceView.getHolder().getSurface()); 

     try { 
      mediaRecorder.prepare(); 
      Log.d("prepare", "prepared"); 
      //mediaRecorder.start(); 
     } catch (IllegalStateException e) { 
      Log.d("fail", "failed"); 
      e.printStackTrace(); 
      releaseMediaRecorder(); 
      return false; 
     } catch (IOException e) { 
      Log.d("fail", "failed2"); 
      e.printStackTrace(); 
      releaseMediaRecorder(); 
      return false; 
     } 
     return true; 
    } 

    @Override 
    protected void onPause() { 
     super.onPause(); 
     releaseMediaRecorder(); 
     releaseCamera(); 
    } 

    private void releaseMediaRecorder(){ 
     if (mediaRecorder != null) { 
      mediaRecorder.reset(); 
      mediaRecorder.release(); 
      mediaRecorder = null; 
      myCamera.lock(); 
     } 
    } 

    private void releaseCamera(){ 
     if (myCamera != null){ 
      myCamera.release(); 
      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; 
      mHolder = getHolder(); 
      mHolder.addCallback(this); 
      mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); 
     } 

     @Override 
     public void surfaceChanged(SurfaceHolder holder, int format, int weight, 
            int height) { 


      if (mHolder.getSurface() == null){ 

       return; 
      } 
      // stop preview before making changes 
      try { 
       mCamera.stopPreview(); 
      } catch (Exception e){ 
       // ignore: tried to stop a non-existent preview 
      } 

      try { 
       mCamera.setPreviewDisplay(mHolder); 
       mCamera.startPreview(); 

      } catch (Exception e){ 
      } 
     } 

     @Override 
     public void surfaceCreated(SurfaceHolder holder) { 

      try { 
       mCamera.setPreviewDisplay(holder); 
       mCamera.startPreview(); 
      } catch (IOException e) { 
       Log.d("prevfail","fail"); 
      } 
     } 

     @Override 
     public void surfaceDestroyed(SurfaceHolder holder) { 

     } 
    } 
}

Logcat

04-04 17:07:42.237 22448-22448/com.abacus.surveillance D/open: open 
04-04 17:07:42.237 22448-22448/com.abacus.surveillance D/ON Create: Got camera 
04-04 17:07:42.257 22448-22448/com.abacus.surveillance I/Choreographer: Skipped 42 frames! The application may be doing too much work on its main thread. 
04-04 17:07:43.118 22448-22448/com.abacus.surveillance D/open: open 
04-04 17:07:43.118 22448-22448/com.abacus.surveillance D/ON Create: Got camera 
04-04 17:07:43.929 22448-22448/com.abacus.surveillance D/open: open 
04-04 17:07:43.929 22448-22448/com.abacus.surveillance D/ON Create: Got camera 
04-04 17:07:44.029 22448-22448/com.abacus.surveillance I/Choreographer: Skipped 96 frames! The application may be doing too much work on its main thread. 
04-04 17:07:44.169 22448-22448/com.abacus.surveillance D/AndroidRuntime: Shutting down VM 
04-04 17:07:44.169 22448-22448/com.abacus.surveillance W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0x418ccda0) 
04-04 17:07:44.199 22448-22448/com.abacus.surveillance E/AndroidRuntime: FATAL EXCEPTION: main 
Process: com.abacus.surveillance, PID: 22448 
    java.lang.RuntimeException: Method called after release() 
    at android.hardware.Camera.setPreviewDisplay(Native Method) 
    at android.hardware.Camera.setPreviewDisplay(Camera.java:530) 
    at com.abacus.surveillance.RecordActivity$MyCameraSurfaceView.surfaceCreated(RecordActivity.java:263) 
    at android.view.SurfaceView.updateWindow(SurfaceView.java:602) 
    at android.view.SurfaceView.access$000(SurfaceView.java:94) 
    at android.view.SurfaceView$3.onPreDraw(SurfaceView.java:183) 
    at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:891) 
    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2193) 
    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1251) 
    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6540) 
    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:813) 
    at android.view.Choreographer.doCallbacks(Choreographer.java:613) 
    at android.view.Choreographer.doFrame(Choreographer.java:583) 
    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:799) 
    at android.os.Handler.handleCallback(Handler.java:733) 
    at android.os.Handler.dispatchMessage(Handler.java:95) 
    at android.os.Looper.loop(Looper.java:146) 
    at android.app.ActivityThread.main(ActivityThread.java:5593) 
    at java.lang.reflect.Method.invokeNative(Native Method) 
    at java.lang.reflect.Method.invoke(Method.java:515) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099) 
    at dalvik.system.NativeStart.main(Native Method)

Logcat 2

04-04 17:19:30.573 2479-2479/com.abacus.surveillance E/AndroidRuntime: FATAL EXCEPTION: main 
Process: com.abacus.surveillance, PID: 2479 
    java.lang.NullPointerException 
    at com.abacus.surveillance.RecordActivity.startRecord(RecordActivity.java:136) 
    at com.abacus.surveillance.RecordActivity.access$000(RecordActivity.java:40) 
    at com.abacus.surveillance.RecordActivity$2.run(RecordActivity.java:90) 
    at android.os.Handler.handleCallback(Handler.java:733) 
    at android.os.Handler.dispatchMessage(Handler.java:95) 
    at android.os.Looper.loop(Looper.java:146) 
    at android.app.ActivityThread.main(ActivityThread.java:5593) 
    at java.lang.reflect.Method.invokeNative(Native Method) 
    at java.lang.reflect.Method.invoke(Method.java:515) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099) 
    at dalvik.system.NativeStart.main(Native Method)

出典

2016-04-04 Eric

+1

初心者向けにlogcatを投稿できます。それがコード内の問題を見つける方法です。 –

+0

2つのログキャッチからプリントアウトを追加しました – Eric

答えて

0

、このようsurfaceCreated()を変更してみてください：

@Override 
    public void surfaceCreated(SurfaceHolder holder) { 
     if(mCamera != null){ 
      try { 
       mCamera.setPreviewDisplay(holder); 
       mCamera.startPreview(); 
      } catch (IOException e) { 
       Log.d("prevfail","fail"); 
      } 
     } 
    }

と第二の例外のために、何かをしてみてください次のように入力します。

private void startRecord(){ 
    if(recording){ 
     try{ 
      if(mediaRecorder != null) 
       mediaRecorder.stop(); 

      releaseMediaRecorder(); 
      //finish(); 
      myButton.setText("REC"); 
     }catch(Exception e){ 
      e.printStackTrace(); 
     } 

    }else{ 

     releaseCamera(); 

     if(!prepareMediaRecorder()){ 
      Toast.makeText(RecordActivity.this, 
        "Fail in prepareMediaRecorder()!\n - Ended -", 
        Toast.LENGTH_LONG).show(); 
      finish(); 
     } 
     else{ 
      mediaRecorder.start(); 
      Log.d("start", "started"); 
      recording = true; 
      myButton.setText("STOP"); 
     } 
    } 
}

出典

2016-04-05 23:23:20 BadCash

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