Generate content with RenderScript and show result to TextureView.

RenderScriptTest.java

import android.app.Activity;
import android.graphics.SurfaceTexture;
import android.os.Bundle;
import android.renderscript.Allocation;
import android.renderscript.Element;
import android.renderscript.RenderScript;
import android.renderscript.Type;
import android.view.Surface;
import android.view.TextureView;
import android.view.View;

import java.util.Random;


public class RenderScriptTest extends Activity implements TextureView.SurfaceTextureListener {
    public static final Random RANDOM = new Random();
    private RenderScript rs;
    private ScriptC_simple simple;
    private Allocation output;

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

        rs = RenderScript.create(this);
        simple = new ScriptC_simple(rs);

        TextureView view = new TextureView(this);
        view.setSurfaceTextureListener(this);
        view.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                int t = RANDOM.nextInt();
                simple.set_t(t);
                simple.forEach_process(output);
                output.ioSend();
            }
        });
        setContentView(view);
    }

    @Override
    public void onSurfaceTextureAvailable(SurfaceTexture surfaceTexture, int width, int height) {
        output = Allocation.createTyped(rs,
                new Type.Builder(rs, Element.RGBA_8888(rs))
                        .setX(width)
                        .setY(height).create(),
                Allocation.USAGE_IO_OUTPUT | Allocation.USAGE_SCRIPT);
        output.setSurface(new Surface(surfaceTexture));
    }

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

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

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

simple.fs

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

int t = 0;

uchar4 __attribute__((kernel)) process(uint32_t x, uint32_t y) {
  uchar4 out = {(x + t) % 255, y % 255, t % 255, 255};
  return out;
}