mPast.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
     if(mPreview.isPlaying()){
      mPosition = mPreview.getCurrentPosition();
      mPreview.seekTo(mPosition-10000);
     }
     else if(!mPreview.isPlaying() || mPreview.isPlaying()==false){
      Log.i("TAG", String.valueOf(mPreview.isPlaying()));
      mPosition = mPreview.getCurrentPosition();
      mPreview.seekTo(mPosition-10000);
      Log.i("TAG", String.valueOf(mPosition-10000));
      mSeekBar.setProgress(mPosition-1000);
      //mPreview.start();

정지된 화면에서는 뒤로가기 버튼했을때 화면이 안바뀌네요 이그..!!
도와주세요