public?class?MainActivity?extends?AppCompatActivity?{
????private?ImageView?imageView;
????GestureDetector?gestureDetector;
????@Override
????protected?void?onCreate(Bundle?savedInstanceState)?{
????????super.onCreate(savedInstanceState);
????????setContentView(R.layout.activity_main);
????????imageView=?(ImageView)?findViewById(R.id.imageView);
????????gestureDetector=new?GestureDetector(this,new?MyGestureListerner());
????????imageView.setOnTouchListener(new?View.OnTouchListener()?{
????????????@Override
????????????public?boolean?onTouch(View?v,?MotionEvent?event)?{
????????????????gestureDetector.onTouchEvent(event);
????????????????Log.i("info","華東了");
????????????????return?false;
????????????}
????????});
????}
????class?MyGestureListerner?extends?GestureDetector.SimpleOnGestureListener{
????????@Override
????????public?boolean?onFling(MotionEvent?e1,?MotionEvent?e2,?float?velocityX,?float?velocityY)?{
????????????Log.i("ges","華東了");
????????????if?(e1.getX()-e2.getX()>50){
????????????????Log.i("info","作畫了");
????????????????Toast.makeText(MainActivity.this,"左滑了",Toast.LENGTH_SHORT).show();
????????????}else?if(e2.getX()-e1.getX()>50){
????????????????Log.i("info","優化了");
????????????????Toast.makeText(MainActivity.this,"右滑了",Toast.LENGTH_SHORT).show();
????????????}
????????????Log.i("ges","結束了");
????????????return?super.onFling(e1,?e2,?velocityX,?velocityY);
????????}