Dismiss Recent Apps when Back is pressed

import android.util.AttributeSet;

import android.util.DisplayMetrics;

import android.util.Log;

import android.view.KeyEvent;

import android.view.LayoutInflater;

import android.view.MenuItem;

import android.view.MotionEvent;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.BaseAdapter;

import android.widget.Button;

import android.widget.ImageView;

import android.widget.PopupMenu;

import android.widget.RelativeLayout;

        }

    }

    @Override

    public boolean onKeyUp(int keyCode, KeyEvent event) {

        if (keyCode == KeyEvent.KEYCODE_BACK && !event.isCanceled()) {

            show(false, true);

            return true;

        }

        return super.onKeyUp(keyCode, event);

    }

    public boolean isInContentArea(int x, int y) {

        // use mRecentsContainer's exact bounds to determine horizontal position

        final int l = mRecentsContainer.getLeft();

            setVisibility(show ? View.VISIBLE : View.GONE);

            mChoreo.jumpTo(show);

        }

        if (show) {

            setFocusable(true);

            setFocusableInTouchMode(true);

            requestFocus();

        }

    }

    public void onAnimationCancel(Animator animation) {