Slider button to accept call in Android

Question

I want to develop my own Accept and Decline buttons for an incoming call. To prevent the call to be accidentally answered or rejected when taking the phone out of the pocket

Answer 1

If you have your own sliding layout then see this code, might be helpful for you.

public class UnlockBar extends RelativeLayout
{
    private OnUnlockListener listener = null;

    private TextView text_label = null;
    private ImageView img_thumb = null;

    private int thumbWidth = 0;
    boolean sliding = false;
    private int sliderPosition = 0;
    int initialSliderPosition = 0;
    float initialSlidingX = 0;

    public UnlockBar(Context context)
    {
        super(context);
        init(context, null);
    }

    public UnlockBar(Context context, AttributeSet attrs)
    {
        super(context, attrs);
        init(context, attrs);
    }

    public UnlockBar(Context context, AttributeSet attrs, int defStyle)
    {
        super(context, attrs, defStyle);
        init(context, attrs);
    }

    public void setOnUnlockListener(OnUnlockListener listener)
    {
        this.listener = listener;
    }

    public void reset()
    {
        final RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) img_thumb.getLayoutParams();
        ValueAnimator animator = ValueAnimator.ofInt(params.leftMargin, 0);
        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator valueAnimator)
            {
                params.leftMargin = (Integer) valueAnimator.getAnimatedValue();
                img_thumb.requestLayout();
            }
        });
        animator.setDuration(300);
        animator.start();
        text_label.setAlpha(1f);
    }

    private void init(Context context, AttributeSet attrs)
    {       
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        inflater.inflate(R.layout.unlock_main, this, true);

        // Retrieve layout elements
        text_label = (TextView) findViewById(R.id.text_label);
        img_thumb = (ImageView) findViewById(R.id.img_thumb);

        // Get padding
        thumbWidth = dpToPx(80); // 60dp + 2*10dp
    }

    @Override
    @SuppressLint("ClickableViewAccessibility")
    public boolean onTouchEvent(MotionEvent event)
    {
        super.onTouchEvent(event);

        if (event.getAction() == MotionEvent.ACTION_DOWN)
        {
            if (event.getX() > sliderPosition && event.getX() < (sliderPosition + thumbWidth))
            {
                sliding = true;
                initialSlidingX = event.getX();
                initialSliderPosition = sliderPosition;
            }
        }
        else if (event.getAction() == MotionEvent.ACTION_UP || event.getAction() == MotionEvent.ACTION_OUTSIDE)
        {
            if (sliderPosition >= (getMeasuredWidth() - thumbWidth))
            {
                if (listener != null) listener.onUnlock();
            }
            else
            {
                sliding = false;
                sliderPosition = 0;
                reset();
            }
        }
        else if (event.getAction() == MotionEvent.ACTION_MOVE && sliding)
        {
            sliderPosition = (int) (initialSliderPosition + (event.getX() - initialSlidingX));
            if (sliderPosition <= 0) sliderPosition = 0;

            if (sliderPosition >= (getMeasuredWidth() - thumbWidth))
            {
                sliderPosition = (int) (getMeasuredWidth()  - thumbWidth);
            }
            else
            {
                int max = (int) (getMeasuredWidth() - thumbWidth);
                int progress = (int) (sliderPosition * 100 / (max * 1.0f));
                text_label.setAlpha(1f - progress * 0.02f);
            }
            setMarginLeft(sliderPosition);
        }

        return true;
    }

    private void setMarginLeft(int margin)
    {
        if (img_thumb == null) return;
        RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) img_thumb.getLayoutParams();
        params.setMargins(margin, 0, 0, 0);
        img_thumb.setLayoutParams(params);
    }

    private int dpToPx(int dp)
    {
        float density = getResources().getDisplayMetrics().density;
        return Math.round((float)dp * density);
    }

    public static interface OnUnlockListener {
        void onUnlock();
    }
}

And just set the listener in main activity

UnlockBar unlock = (UnlockBar) findViewById(R.id.unlock);

        // Attach listener
        unlock.setOnUnlockListener(new OnUnlockListener() {
            @Override
            public void onUnlock()
            {
                Toast.makeText(TestActivity.this, "You've successfully unlocked it !", Toast.LENGTH_LONG).show();
            }
        });

And draw your own slide_image_layout.xml

And in your main_layout.xml add this ..