Base canvas usage.

app/src/main/java/com/codigoparallevar/minicards/DrawView.java

@@ -0,0 +1,23 @@
+package com.codigoparallevar.minicards;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.view.View;
+
+class DrawView extends View {
+
+    Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
+
+    public DrawView(Context context) {
+        super(context);
+        paint.setColor(Color.RED);
+    }
+
+    @Override
+    public void onDraw(Canvas canvas){
+        canvas.drawLine(0, 0, 20, 20, paint);
+        canvas.drawLine(20, 0, 0, 20, paint);
+    }
+}

app/src/main/java/com/codigoparallevar/minicards/TestActivity.java

@@ -1,22 +1,17 @@
 package com.codigoparallevar.minicards;
 
-import android.opengl.GLSurfaceView;
+import android.graphics.Color;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 
-import com.codigoparallevar.minicards.rendering.MyGLSurfaceView;
-
 public class TestActivity extends AppCompatActivity {
 
-    private GLSurfaceView mGLView;
-
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
-        // Create a GLSurfaceView instance and set it
+        DrawView drawView = new DrawView(this);
-        // as the ContentView for this Activity.
+        drawView.setBackgroundColor(Color.BLACK);
-        mGLView = new MyGLSurfaceView(this);
+        setContentView(drawView);
-        setContentView(mGLView);
     }
 }

app/src/main/java/com/codigoparallevar/minicards/rendering/MyGLSurfaceView.java

@@ -1,20 +0,0 @@
-package com.codigoparallevar.minicards.rendering;
-
-import android.content.Context;
-import android.opengl.GLSurfaceView;
-
-public class MyGLSurfaceView extends GLSurfaceView {
-
-    private final MyGlRenderer mRenderer;
-
-    public MyGLSurfaceView(Context context) {
-        super(context);
-
-        setEGLContextClientVersion(2);
-
-        mRenderer = new MyGlRenderer();
-
-        setRenderer(mRenderer);
-        setRenderMode(GLSurfaceView.RENDERMODE_WHEN_DIRTY);
-    }
-}

app/src/main/java/com/codigoparallevar/minicards/rendering/MyGlRenderer.java

@@ -1,45 +0,0 @@
-package com.codigoparallevar.minicards.rendering;
-
-import android.opengl.GLES20;
-import android.opengl.GLSurfaceView;
-import android.util.Log;
-
-import javax.microedition.khronos.egl.EGLConfig;
-import javax.microedition.khronos.opengles.GL10;
-
-class MyGlRenderer implements GLSurfaceView.Renderer {
-
-    private Triangle mTriangle;
-    private Square mSquare;
-
-    @Override
-    public void onSurfaceCreated(GL10 gl10, EGLConfig eglConfig) {
-        GLES20.glClearColor(0.75f, 0.81f, 1.0f, 1.0f);
-
-        mTriangle = new Triangle();
-        mSquare = new Square();
-    }
-
-    @Override
-    public void onSurfaceChanged(GL10 gl10, int width, int height) {
-        GLES20.glViewport(0, 0, width, height);
-    }
-
-    @Override
-    public void onDrawFrame(GL10 gl10) {
-        GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
-        mTriangle.draw();
-    }
-
-    public static int loadShader(int type, String shaderCode){
-        // create a vertex shader type (GLES20.GL_VERTEX_SHADER)
-        // or a fragment shader type (GLES20.GL_FRAGMENT_SHADER)
-        int shader = GLES20.glCreateShader(type);
-
-        // add the source code to the shader and compile it
-        GLES20.glShaderSource(shader, shaderCode);
-        GLES20.glCompileShader(shader);
-
-        return shader;
-    }
-}

app/src/main/java/com/codigoparallevar/minicards/rendering/Square.java

@@ -1,67 +0,0 @@
-package com.codigoparallevar.minicards.rendering;
-
-import android.opengl.GLES20;
-
-import java.nio.ByteBuffer;
-import java.nio.ByteOrder;
-import java.nio.FloatBuffer;
-import java.nio.ShortBuffer;
-import java.sql.SQLInvalidAuthorizationSpecException;
-
-public class Square {
-
-    private final String vertexShaderCode =
-            "attribute vec4 vPosition;" +
-                    "void main(){" +
-                    "gl_Position = vPosition;" +
-                    "}";
-
-    private final String fragmentShaderCode =
-            "precision medium float;" +
-                    "uniform vec4 vColor;" +
-                    "void main(){" +
-                    "gl_FragColor = vColor;" +
-                    "}";
-    private final int mProgram;
-
-
-    private FloatBuffer vertexBuffer;
-    private ShortBuffer drawListBuffer;
-
-    static final int COORDS_PER_VERTEX = 3;
-    static float squareCoords[] = {
-            -0.5f,  0.5f, 0.0f,   // top left
-            -0.5f, -0.5f, 0.0f,   // bottom left
-             0.5f, -0.5f, 0.0f,   // bottom right
-             0.5f,  0.5f, 0.0f,   // top right
-    };
-
-    private short drawOrder[] = { 0, 1, 2, 0, 2, 3 }; // order to draw vertices
-
-    public Square(){
-        ByteBuffer bb = ByteBuffer.allocateDirect(squareCoords.length * 4);
-        bb.order(ByteOrder.nativeOrder());
-
-        vertexBuffer = bb.asFloatBuffer();
-        vertexBuffer.put(squareCoords);
-        vertexBuffer.position(0);
-
-        ByteBuffer dlb = ByteBuffer.allocateDirect(drawOrder.length * 2);
-        dlb.order(ByteOrder.nativeOrder());
-        drawListBuffer = dlb.asShortBuffer();
-        drawListBuffer.put(drawOrder);
-        drawListBuffer.position(0);
-
-
-        int vertexShader = MyGlRenderer.loadShader(GLES20.GL_VERTEX_SHADER,
-                vertexShaderCode);
-        int fragmentShader = MyGlRenderer.loadShader(GLES20.GL_FRAGMENT_SHADER,
-                fragmentShaderCode);
-
-        mProgram = GLES20.glCreateProgram();
-        GLES20.glAttachShader(mProgram, vertexShader);
-        GLES20.glAttachShader(mProgram, fragmentShader);
-
-        GLES20.glLinkProgram(mProgram);
-    }
-}

app/src/main/java/com/codigoparallevar/minicards/rendering/Triangle.java

@@ -1,80 +0,0 @@
-package com.codigoparallevar.minicards.rendering;
-
-import android.opengl.GLES20;
-import android.util.Log;
-
-import java.nio.ByteBuffer;
-import java.nio.ByteOrder;
-import java.nio.FloatBuffer;
-
-public class Triangle {
-
-    private final String vertexShaderCode =
-            "attribute vec4 vPosition;" +
-            "void main(){" +
-                "gl_Position = vPosition;" +
-            "}";
-
-    private final String fragmentShaderCode =
-            "precision mediump float;" +
-            "uniform vec4 vColor;" +
-            "void main(){" +
-                "gl_FragColor = vColor;" +
-            "}";
-
-    private FloatBuffer vertexBuffer;
-    private final int mProgram;
-
-    static final int COORDS_PER_VERTEX = 3;
-    static float triangleCoords[] = {
-             0.0f,  0.622008459f, 0.0f, // top
-            -0.5f, -0.311004243f, 0.0f, // bottom left
-             0.5f, -0.311004243f, 0.0f  // bottom right
-    };
-
-    // Set color with red, green, blue and alpha (opacity) values
-    float color[] = { 0.63671875f, 0.76953125f, 0.22265625f, 1.0f };
-    private int mPositionHandle;
-    private int mColorHandle;
-
-    private final int vertexCount = triangleCoords.length / COORDS_PER_VERTEX;
-    private final int vertexStride = COORDS_PER_VERTEX * 4; // 4 bytes per vertex
-
-    public Triangle(){
-        ByteBuffer bb = ByteBuffer.allocateDirect(triangleCoords.length * 4);
-        bb.order(ByteOrder.nativeOrder());
-
-        vertexBuffer = bb.asFloatBuffer();
-        vertexBuffer.put(triangleCoords);
-        vertexBuffer.position(0);
-
-        int vertexShader = MyGlRenderer.loadShader(GLES20.GL_VERTEX_SHADER,
-                                                   vertexShaderCode);
-        int fragmentShader = MyGlRenderer.loadShader(GLES20.GL_FRAGMENT_SHADER,
-                                                     fragmentShaderCode);
-
-        mProgram = GLES20.glCreateProgram();
-        GLES20.glAttachShader(mProgram, vertexShader);
-        GLES20.glAttachShader(mProgram, fragmentShader);
-
-        GLES20.glLinkProgram(mProgram);
-    }
-
-    public void draw(){
-        GLES20.glUseProgram(mProgram);
-
-        mPositionHandle = GLES20.glGetAttribLocation(mProgram, "vPosition");
-        GLES20.glEnableVertexAttribArray(mPositionHandle);
-
-        GLES20.glVertexAttribPointer(mPositionHandle, COORDS_PER_VERTEX,
-                                     GLES20.GL_FLOAT, false,
-                                     vertexStride, vertexBuffer);
-
-        mColorHandle = GLES20.glGetUniformLocation(mProgram, "vColor");
-
-        GLES20.glUniform4fv(mColorHandle, 1, color, 0);
-        Log.d("Triangle", "VB "+ vertexBuffer.get(1));
-        GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0, vertexCount);
-        GLES20.glDisableVertexAttribArray(mPositionHandle);
-    }
-}