问题描述

我在使用 android viewpager 幻灯片时遇到问题.我想在最短时间后显示 viewpager 布局.这是我的代码示例.我的主要课程:

I have problem with android viewpager slideshow. I want to show the viewpager layout after a minimum time period. Here is my code sample. My main class:

public class MainActivity extends Activity {
    private ViewPager mViewPager;
    private SwipeAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mViewPager = (ViewPager) findViewById(R.id.pager);
        // set the adapter
        adapter = new SwipeAdapter(MainActivity.this);
        mViewPager.setAdapter(adapter);

        mViewPager.setOnPageChangeListener(new OnPageChangeListener() {

            @Override
            public void onPageSelected(int position) {
            }

            @Override
            public void onPageScrolled(int arg0, float arg1, int arg2) {
            }
            @Override
            public void onPageScrollStateChanged(int arg0) {
            }
        });
    }

}

我的适配器类:

public class SwipeAdapter extends PagerAdapter {

    private LayoutInflater mInflater;
    private static int[] mLayouts = { R.layout.view_layout1,
            R.layout.view_layout2, R.layout.view_layout3, R.layout.view_layout4 };

    SwipeAdapter(Context context) {
        mInflater = LayoutInflater.from(context);
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        container.removeView((View) object);
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        ViewGroup pageView = (ViewGroup) mInflater.inflate(mLayouts[position],
                container, false);
        container.addView(pageView);
        getItemPosition(pageView);
        return pageView;
    }

    @Override
    public int getCount() {
        return mLayouts.length;
    }
    @Override
    public boolean isViewFromObject(View view, Object obj) {
        return view == obj;
    }
}

假设我想让 viewpager 布局在 10 秒后自动滑动.怎么可能.

suppose that I want to make the viewpager layout auto sliding after 10 seconds. How can it possible.

推荐答案

使用Handler让它自动滑动.这是一些代码

Use Handler to make it auto slide. Here is some code

private Handler handler = new Handler();
private Runnable runnable = new Runnable() {
    public void run() {
            if( position >= 4){
                position = 0;
            }else{
                position = position+1;
            }
            toBarPager.setCurrentItem(position, true);
            handler.postDelayed(runnable, 10000);
    }
};

别忘了移除回调onPause()

@Override
public void onPause() {
    super.onPause();
    if (handler!= null) {
        handler.removeCallbacks(runnable);
    }
}

另外，别忘了重新运行 onResume()

Also, don't forget to rerun onResume()

@Override
public void onResume() {
    super.onResume();  // Always call the superclass method first
    handler.postDelayed(runnable, 10000);
}

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