Android TextureView & MediaPlayer implements video media player

Android TextureView & MediaPlayer implements video media playercode:
import android.graphics.SurfaceTexture;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Surface;
import android.view.TextureView;

import java.io.File;

public class MainActivity extends AppCompatActivity {

private MediaPlayer mMediaPlayer;

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

TextureView textureView = new TextureView(this);
setContentView(textureView);

textureView.setSurfaceTextureListener(new TextureView.SurfaceTextureListener() {
@Override
public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
Surface mSurface = new Surface(surface);
player(mSurface);
}

@Override
public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {

}

@Override
public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
mMediaPlayer.stop();
mMediaPlayer.release();

return false;
}

@Override
public void onSurfaceTextureUpdated(SurfaceTexture surface) {

}
});
}

private void player(Surface surface) {
try {
File file = new File(Environment.getExternalStorageDirectory() + "/video.mp4");

mMediaPlayer = new MediaPlayer();
mMediaPlayer.setDataSource(file.getAbsolutePath());
mMediaPlayer.setSurface(surface);
mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mMediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
mMediaPlayer.start();
}
});
mMediaPlayer.prepare();
} catch (Exception e) {
e.printStackTrace();
}
}
}

need permission:
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>