Question

我需要停止循环。我有四张照片：所以在幻灯片转到4张后我需要停止滑动。

主要活动：

public class MainActivity extends AppCompatActivity {
    private static ViewPager mPager;
    private static int currentPage = 0;
    private static int NUM_PAGES = 0;
     private static final Integer[] IMAGES= {R.drawable.one,R.drawable.two,R.drawable.three,R.drawable.five};
private ArrayList<Integer> ImagesArray = new ArrayList<Integer>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        init();
    }

    private void init() {

        for(int i=0;i<IMAGES.length;i++)
            ImagesArray.add(IMAGES[i]);

        mPager = (ViewPager) findViewById(R.id.pager);

        mPager.setAdapter(new SlidingImage_Adapter(MainActivity.this,ImagesArray));

        CirclePageIndicator indicator = (CirclePageIndicator)
                findViewById(R.id.indicator);

        indicator.setViewPager(mPager);

        final float density = getResources().getDisplayMetrics().density;

        indicator.setRadius(5 * density);

        NUM_PAGES =IMAGES.length;

        // Auto start of viewpager
        final Handler handler = new Handler();
        final Runnable Update = new Runnable() {
            public void run() {
                if (currentPage == NUM_PAGES) {
                    currentPage = 0;
                }
                mPager.setCurrentItem(currentPage++, true);
            }
        };
        Timer swipeTimer = new Timer();
        swipeTimer.schedule(new TimerTask() {
            @Override
            public void run() {
                handler.post(Update);
            }
        }, 3000, 3000);

        // Pager listener over indicator
        indicator.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {

            @Override
            public void onPageSelected(int position) {
                currentPage = position;

            }

            @Override
            public void onPageScrolled(int pos, float arg1, int arg2) {

            }

            @Override
            public void onPageScrollStateChanged(int pos) {

            }
        });

    }

}

Answer 1

我不确定代码，但我认为问题在于：

final Runnable Update = new Runnable() {
            public void run() {
                if (currentPage == NUM_PAGES) {
                    currentPage = 0;
                }
                mPager.setCurrentItem(currentPage++, true);
            }
        };

每当它到达结尾时，它会检查此条件(currentPage == NUM_PAGES)并从0重新开始。

如果你想在结束时停止，你应该使用它：

final Runnable Update = new Runnable() {
                public void run() {
                    if (currentPage < NUM_PAGES) {
                         mPager.setCurrentItem(currentPage++, true);
                    }
                }
            };

它应该在currentPage == NUM_PAGES

时停止

如何在android中停止循环幻灯片

1 个答案: