我想通过滑动图像来进行改变背景的主要活动，并且在左侧我想放置一个包含 4 个按钮的按钮栏以移动到 4 个不同的活动，所以我编写了以下代码：
public class MainActivity extends Activity {
Button[] buttons = new Button[4];
SharedPreferences fsc;
private static final int SWIPE_MIN_DISTANCE = 120;
private static final int SWIPE_THRESHOLD_VELOCITY = 200;
private ViewFlipper mViewFlipper;
private Context mContext;
private final GestureDetector detector = new SwipeGestureDetector();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_main);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
addListenerOnButton();
setContentView(R.layout.activity_main);
mContext = this;
mViewFlipper = (ViewFlipper) this.findViewById(R.id.view_flipper);
mViewFlipper.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(final View view, final MotionEvent event) {
detector.onTouchEvent(event);
return true;
}
});
}
private void addListenerOnButton() {
buttons[0] = (Button) findViewById(R.id.slide);
buttons[0].setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
Intent myIntent = new Intent(MainActivity.this,
slideshow.class);
startActivity(myIntent);
// TODO Auto-generated method stub
}
}
);
class SwipeGestureDetector extends SimpleOnGestureListener {
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
try {
// right to left swipe
if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
mViewFlipper.setInAnimation(AnimationUtils.loadAnimation(mContext, R.anim.left_in));
mViewFlipper.setOutAnimation(AnimationUtils.loadAnimation(mContext, R.anim.left_out));
mViewFlipper.showNext();
return true;
} else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
mViewFlipper.setInAnimation(AnimationUtils.loadAnimation(mContext, R.anim.right_in));
mViewFlipper.setOutAnimation(AnimationUtils.loadAnimation(mContext,R.anim.right_out));
mViewFlipper.showPrevious();
return true;
}
} catch (Exception e) {
e.printStackTrace();
}
return false;
}
}
}