收到短信后拍摄视频

Question

我是Android的新手，如果有人会帮我解决这个问题，我将不胜感激。我有一个应用程序，当收到短信时，它应该拍摄视频。但它不起作用。这是代码： SmsReceiver类：

public class SmsReceiver extends BroadcastReceiver{  static int ok=0;
@Override
public void onReceive(Context context, Intent intent) 
{ Bundle bundle = intent.getExtras();        
SmsMessage[] msgs = null;
String str = ""; 
String mesaj="";
if (bundle != null)
{Object[] pdus = (Object[]) bundle.get("pdus");
    msgs = new SmsMessage[pdus.length];            
    for (int i=0; i<msgs.length; i++)
     {
        msgs[i] = SmsMessage.createFromPdu((byte[])pdus[i]);                
        str += "SMS from " + msgs[i].getOriginatingAddress();                     
        str += " :";
        str += msgs[i].getMessageBody().toString();
        mesaj = msgs[i].getMessageBody().toString();
        str += "\n";           
     }if(mesaj.equals("Video")){Toast.makeText(context, mesaj, Toast.LENGTH_LONG).show();
ok=1;} } } } 

MainActivity类：

public class MainActivity extends Activity implements SurfaceHolder.Callback{Button myButton; MediaRecorder mediaRecorder; SurfaceHolder surfaceHolder; boolean recording; int dur=3000; static MainActivity video;
   @Override
    public void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   recording = false;
  mediaRecorder = new MediaRecorder();
   initMediaRecorder();  
  video=this;
   setContentView(R.layout.activity_main);

   SurfaceView myVideoView = (SurfaceView)findViewById(R.id.videoview);
   surfaceHolder = myVideoView.getHolder();
   surfaceHolder.addCallback(this);
   surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
  myButton = (Button)findViewById(R.id.mybutton);
   myButton.setOnClickListener(myButtonOnClickListener);} public Button.OnClickListener myButtonOnClickListener = new Button.OnClickListener(){
   @Override
 public void onClick(View arg0) {
if(SmsReceiver.ok==1) if(recording){ mediaRecorder.stop(); mediaRecorder.release();}else{mediaRecorder.start();recording = true; myButton.setText("STOP");} }};@Override public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {}@Override public void surfaceCreated(SurfaceHolder arg0) {prepareMediaRecorder();}@Override public void surfaceDestroyed(SurfaceHolder arg0) { }public void initMediaRecorder(){mediaRecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT); mediaRecorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);CamcorderProfile camcorderProfile_HQ = CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH);mediaRecorder.setProfile(camcorderProfile_HQ);
   mediaRecorder.setOutputFile(Environment.getExternalStorageDirectory().getPath()+"/"+System.currentTimeMillis()+".mp4");
   mediaRecorder.setMaxDuration(3000); // Set max duration 60 sec.
   mediaRecorder.setMaxFileSize(5000000); // Set max file size 5M}public void prepareMediaRecorder(){mediaRecorder.setPreviewDisplay(surfaceHolder.getSurface());try{mediaRecorder.prepare();} catch (IllegalStateException e) {e.printStackTrace();}catch (IOException e){e.printStackTrace();}}}