RenderScript filter shows output to TextureView.

mono.fs

#pragma version(1)
#pragma rs java_package_name(com.eje_c.renderscripttest)
#pragma rs_fp_relaxed

uchar4 __attribute__((kernel)) process(uchar4 in) {
  in.r = in.g = in.b = in.r * 0.299f + in.g * 0.587f + in.b * 0.114f;
  return in;
}

RenderScriptFilterTest.java

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.SurfaceTexture;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.renderscript.Allocation;
import android.renderscript.RenderScript;
import android.view.Surface;
import android.view.TextureView;
import android.view.View;


public class RenderScriptFilterTest extends Activity implements TextureView.SurfaceTextureListener {
    private RenderScript rs;
    private ScriptC_mono filter;
    private Allocation input;
    private Allocation output;

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

        rs = RenderScript.create(this);
        filter = new ScriptC_mono(rs);

        Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.testphoto);
        input = Allocation.createFromBitmap(rs, bmp);
        output = Allocation.createTyped(rs, input.getType(), Allocation.USAGE_IO_OUTPUT | Allocation.USAGE_SCRIPT);

        TextureView view = new TextureView(this);
        view.setSurfaceTextureListener(this);
        setContentView(view);
    }

    @Override
    public void onSurfaceTextureAvailable(SurfaceTexture surfaceTexture, int width, int height) {
        output.setSurface(new Surface(surfaceTexture));

        filter.forEach_process(input, output);
        output.ioSend();
    }

    @Override
    public void onSurfaceTextureSizeChanged(SurfaceTexture surfaceTexture, int i, int i2) {
    }

    @Override
    public boolean onSurfaceTextureDestroyed(SurfaceTexture surfaceTexture) {
        return false;
    }

    @Override
    public void onSurfaceTextureUpdated(SurfaceTexture surfaceTexture) {
    }
}