在Android中只錄制視頻的視頻錄製只是一次

Question

我發現這個工作代碼將捕獲視頻並修改了一下。是的，代碼運行良好，但它只允許用戶只錄制視頻一次。當我點擊「開始錄製」時，當用戶點擊菜單中的「停止錄製」時，它將不再錄製視頻。

我想要發生的是當我點擊「停止錄製」時，它會再次準備相機，然後當我點擊「開始錄製」時它會錄製一個新的視頻。

如何解決這個問題？

這裏主要代碼的方式：

package com.tcs.video; 
import android.app.Activity; 
import android.content.Context; 
import android.content.pm.ActivityInfo; 
import android.media.MediaRecorder; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.Surface; 
import android.view.SurfaceHolder; 
import android.view.SurfaceView; 
import android.view.Window; 

public class VideoRecorder extends Activity{ 

private MediaRecorder recorder; 
private Preview mPreview; 

boolean flag=false; 
boolean startedRecording=false; 


public void onCreate(Bundle savedInstanceState) 
{ 
    super.onCreate(savedInstanceState); 
    recorder = new MediaRecorder(); 
    recorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT); 
    recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); 
    recorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP); 
    mPreview = new Preview(VideoRecorder.this,recorder); 
    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); 
    setContentView(mPreview); 

} 


@Override 
public boolean onPrepareOptionsMenu(Menu menu) 
{ 
    super.onPrepareOptionsMenu(menu); 
    menu.clear(); 
    menu.add(0, 0, 0, "Start Recording"); 
    menu.add(1, 1, 0, "Stop Recording"); 

    menu.setGroupVisible(0, false); 
    menu.setGroupVisible(1, false); 

    if(startedRecording==false){ 
     menu.setGroupVisible(0, true); 
     menu.setGroupVisible(1, false); 
    }else if(startedRecording==true){ 
     menu.setGroupVisible(1, true); 
     menu.setGroupVisible(0, false); 
    } 

    return true; 
} 


/*! 
    <p> 
    This method receives control when Item in menu option is selected. It contains implementations 
    to be performed on selection of menu item. 
    </p>*/ 

@Override 
public boolean onOptionsItemSelected(MenuItem item) 
{ 
    switch (item.getItemId()) 
    { 
    case 0: 
     //start the recorder 
     recorder.start(); 
     startedRecording=true; 
     break; 

    case 1: 
     //stop the recorder 
     recorder.stop(); 
     recorder.release(); 
     recorder = null; 
     startedRecording=false; 
     break; 


    default: 
     break; 
    } 
    return super.onOptionsItemSelected(item); 
} 

class Preview extends SurfaceView implements SurfaceHolder.Callback 
{ 
    //Create objects for MediaRecorder and SurfaceHolder. 
    SurfaceHolder mHolder; 
    MediaRecorder tempRecorder; 

    //Create constructor of Preview Class. In this, get an object of 
    //surfaceHolder class by calling getHolder() method. After that add 
    //callback to the surfaceHolder. The callback will inform when surface is 
    //created/changed/destroyed. Also set surface not to have its own buffers. 
    public Preview(Context context,MediaRecorder recorder) { 
     super(context); 
     tempRecorder=recorder; 
     mHolder=getHolder(); 
     mHolder.addCallback(this); 
     mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); 
     // TODO Auto-generated constructor stub 
    } 

    public Surface getSurface() 
    { 
     return mHolder.getSurface(); 
    } 

    // Implement the methods of SurfaceHolder.Callback interface 

    // SurfaceCreated : This method gets called when surface is created. 
    // In this, initialize all parameters of MediaRecorder object. 
    //The output file will be stored in SD Card. 

    public void surfaceCreated(SurfaceHolder holder){ 
     tempRecorder.setOutputFile("/sdcard/recordvideooutput.3gpp"); 
     tempRecorder.setPreviewDisplay(mHolder.getSurface()); 
     try{ 
      tempRecorder.prepare(); 
     } catch (Exception e) { 
      String message = e.getMessage(); 
      tempRecorder.release(); 
      tempRecorder = null; 
     } 
    } 

    public void surfaceDestroyed(SurfaceHolder holder) 
    { 
     if(tempRecorder!=null) 
     { 
      tempRecorder.release(); 
      tempRecorder = null; 
     } 
    } 

    public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) 
    { 

    } 
    } 
} 

請幫幫忙！

感謝

傑森

Answer 1

當你按下停止按鈕，它釋放的記錄，並指定其爲null。除非我在這裏沒有看到什麼，否則沒有什麼可以爲另一個錄音做準備。

嘗試使用recorder.reset()代替release()和= null。關於official documentation的生命週期有一個很好的解釋。

Answer 2

這一個Geobits

@Override 
public boolean onOptionsItemSelected(MenuItem item) 
{ 
    switch (item.getItemId()) 
    { 
    case 0: 
     //start the recorder 
     recorder.start(); 
     startedRecording=true; 
     break; 

    case 1: 
     //stop the recorder 
     recorder.stop(); 
     recorder.prepare(); 
     startedRecording=false; 
     break; 


    default: 
     break; 
    } 
    return super.onOptionsItemSelected(item); 
}