재생 할수없는 동영상입니다. 해결방안 알려주세요 . [closed]

Question

import android.app.Activity;

import android.media.MediaPlayer;

import android.os.Bundle;

import android.content.Intent;

import android.view.View;

import android.widget.LinearLayout;

 

 

public class MainActivity extends Activity {

 

MediaPlayer mp = new MediaPlayer();

 

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        

        mp = MediaPlayer.create(this, R.drawable.schoolbell);

    mp.setLooping(false);;

mp.start();

super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        

        setTitle("비디오 목록");

    }

    

   

    public void play(View v) {

    int id = v.getId();

    LinearLayout layout = (LinearLayout)findViewById(id);

 

    String tag = (String)layout.getTag();

int id_video = getResources().getIdentifier(tag, "drawable", getPackageName());

 

    Intent it = new Intent(this, VideoPlayback.class);

    String str_id_video = Integer.toString(id_video); 

    it.putExtra("it_id_video",    str_id_video);

    startActivity(it);

    }

}

 

import android.app.Activity;

import android.content.Intent;

import android.net.Uri;

import android.os.Bundle;

import android.view.View;

import android.widget.MediaController;

import android.widget.VideoView;

 

public class VideoPlayback extends Activity {

 

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.video_playback);

        

        setTitle("시네마틱");

        

        Intent it = getIntent();

        String str_id_video = it.getStringExtra("it_id_video");

        int id_video = Integer.parseInt(str_id_video);

        

        Uri uri = Uri.parse("android.resource://com.example.videoplayback3/" + id_video);

        

        VideoView videoview = (VideoView)findViewById(R.id.videoview);

        videoview.setVideoURI(uri);

        videoview.start();

        

        MediaController mcontroller = new MediaController(this);

        videoview.setMediaController(mcontroller);

    }

    

    public void closeVideo(View v) {

    finish();

    }

    

}

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" 

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin" >

 

    <VideoView 

        android:id="@+id/videoview"

        android:layout_width="match_parent"

        android:layout_height="300dp" />

    

    <Button

        android:id="@+id/btn_close"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="뒤로"

        android:layout_gravity="right"

        android:clickable="true"

        android:onClick="closeVideo" />

       

</LinearLayout>

맨위에는 MainActivity 소스 값이고 2 번쨰가 VideoPlayback 값 3 번쨰가 video_playback 값입니다 

문제가 음악은 자동으로 잘 나오는데

동영상은 재생 할수없는 동영상입니다라고 나옵니다

영상 용량은 7.4M가이고 따로 영상 만 만들면 잘되는데 

머가 문제인지 잘 모르겠습니다 해결 방안 알려 주시면 안 되겠습니까?