Question

我想制作一个主要的活动，通过刷新图像改变背景，在左侧我想放一个包含4个按钮的按钮栏移动到4个不同的活动，所以我写下了folloning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;
    }
}

}

Answer 1

您不是import所需的库类。 This question可能会有所帮助。

看起来你是在基本的文本编辑器中手动完成的。使用像Eclipse这样的IDE（具有良好的Android工具）将使您不必手动完成所有这些操作。

使用按钮栏创建幻灯片放映

1 个答案: