Android - How to draw on view

Ich bin tring zu malen, auf meine eigene Ansicht (R. id.Sicht), aber der code scheint nicht zu haben keine Wirkung. Es ist nicht erlaubt mir, zu zeichnen, überhaupt nichts.

public class MainActivity extends Activity implements OnTouchListener
        {
Path mPath;
Canvas canvas;
Paint mPaint;
MaskFilter mEmboss;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        View view=(View)findViewById(R.id.view1);
        mPaint = new Paint();
        mPaint.setAntiAlias(true);
        mPaint.setDither(true);
        mPaint.setColor(0xFFFF0000);
        mPaint.setStyle(Paint.Style.STROKE);
        mPaint.setStrokeJoin(Paint.Join.ROUND);
        mPaint.setStrokeCap(Paint.Cap.ROUND);
        mPaint.setStrokeWidth(12);

        canvas = null;
        //view.draw(canvas);
        mPath = new Path();
        Bitmap mBitmap;
        //Paint mBitmapPaint = new Paint(Paint.DITHER_FLAG);
        mBitmap = Bitmap.createBitmap(210, 170, Bitmap.Config.ARGB_8888);
        canvas = new Canvas(mBitmap);
        canvas.drawColor(0xFFAAAAAA);

        canvas.drawBitmap(mBitmap, 0, 0, mPaint);


        //canvas.drawPaint(mPaint);
        view.draw(canvas);
        canvas.drawPath(mPath, mPaint);


        mEmboss = new EmbossMaskFilter(new float[] { 1, 1, 1 },
                                       0.4f, 6, 3.5f);



        view.setOnTouchListener(new OnTouchListener() {

            public boolean onTouch(View v, MotionEvent event) {
                float x = event.getX();
                float y = event.getY();
                Log.d("x", String.valueOf(x));
                Log.d("y", String.valueOf(y));

                switch (event.getAction()) {
                    case MotionEvent.ACTION_DOWN:
                        Log.d("a","down");
                        touch_start(x, y);
                        //invalidate();
                        break;
                    case MotionEvent.ACTION_MOVE:
                        touch_move(x, y);
                       //invalidate();
                        break;
                    case MotionEvent.ACTION_UP:
                        touch_up();
                       //invalidate();
                        break;
                }
                return true;
            }
        });

       //mBlur = new BlurMaskFilter(8, BlurMaskFilter.Blur.NORMAL);
    }
    private float mX, mY;
    private static final float TOUCH_TOLERANCE = 4;

    private void touch_start(float x, float y) {
        mPath.reset();
        mPath.moveTo(x, y);
        mX = x;
        mY = y;
    }
    private void touch_move(float x, float y) {
        float dx = Math.abs(x - mX);
        float dy = Math.abs(y - mY);
        if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {
            mPath.quadTo(mX, mY, (x + mX)/2, (y + mY)/2);
            mX = x;
            mY = y;
        }
    }
    private void touch_up() {
        mPath.lineTo(mX, mY);
        //commit the path to our offscreen
        canvas.drawPath(mPath, mPaint);
        //kill this so we don't double draw
        mPath.reset();
    }





}

Was muss ich tun, um die Nutzung der freehanf finger Farbe auf meine eigene Meinung?

InformationsquelleAutor Aakash Anuj | 2012-12-13
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