Question

我有5 SlidingTabs。我想将ViewPager animation放入其中一个。

片段类：

public class AdFragment extends Fragment {

int[] mResources = {
        R.drawable.six,
        R.drawable.five,
        R.drawable.four,
        R.drawable.eight,
        R.drawable.one,
        R.drawable.two,
        R.drawable.three,
        R.drawable.seven,
        R.drawable.nine,
        R.drawable.ten,
};
int currentPage;
public AdFragment() {
    // Required empty public constructor
}
Timer swipeTimer;


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view = inflater.inflate(R.layout.fragment_ad, container, false);
    CustomPagerAdapter mCustomPagerAdapter = new CustomPagerAdapter(getActivity(),mResources);

    final ViewPager mViewPager = (ViewPager) view.findViewById(R.id.pager);
    mViewPager.setAdapter(mCustomPagerAdapter);

    final Handler handler = new Handler();
    final Runnable Update = new Runnable() {
        public void run() {
            if (currentPage == mResources.length) {
                currentPage = 0;
            }
            mViewPager.setCurrentItem(currentPage++, true);
        }
    };

    swipeTimer = new Timer();
    swipeTimer.schedule(new TimerTask() {

        @Override
        public void run() {
            handler.post(Update);
        }
    }, 500, 3000);

    return view;
}

}

适配器类：

class CustomPagerAdapter extends PagerAdapter {

Context mContext;
LayoutInflater mLayoutInflater;
int[] mResources;
private Resources resource;

public CustomPagerAdapter(Context context,int[] mResources) {
    mContext = context;
    mLayoutInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    this.mResources = mResources;
}

@Override
public int getCount() {
    return mResources.length;
}

@Override
public boolean isViewFromObject(View view, Object object) {
    return view == ((LinearLayout) object);
}

@Override
public Object instantiateItem(ViewGroup container, int position) {
    View itemView = mLayoutInflater.inflate(R.layout.pager_item, container, false);

    ImageView imageView = (ImageView) itemView.findViewById(R.id.imageView);
    imageView.setImageResource(mResources[position]);

    container.addView(itemView);

    return itemView;
}

@Override
public void destroyItem(ViewGroup container, int position, Object object) {
    container.removeView((LinearLayout) object);
}
@Override
public Object instantiateItem(View view, int position) {
    ImageView myView = new ImageView(mContext);

    Bitmap bitmap = BitmapFactory.decodeResource(mContext.getResources(), mResources[position]);
    myView.setImageBitmap(bitmap);

    ((ViewPager) view).addView(myView);
    return myView;
}
}

目前我在幻灯片中有10张图片。当我用上述Tab打开我的Fragment时，请等待一段时间，然后尝试转到另一个Tab并再次返回这个 - 我明白了：

    01-27 14:13:53.794 12652-12652/igor.com.totalsoulbeta E/AndroidRuntime: FATAL EXCEPTION: main
                                                                    Process: igor.com.totalsoulbeta, PID: 12652
                                                                    java.lang.OutOfMemoryError
                                                                        at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method)
                                                                        at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:587)
                                                                        at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:422)
                                                                        at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:840)
                                                                        at android.content.res.Resources.loadDrawable(Resources.java:2113)
                                                                        at android.content.res.Resources.getDrawable(Resources.java:700)
                                                                        at android.content.res.XResources.getDrawable(XResources.java:521)
                                                                        at android.support.v4.content.ContextCompat.getDrawable(ContextCompat.java:323)
                                                                        at android.support.v7.widget.TintManager.getDrawable(TintManager.java:175)
                                                                        at android.support.v7.widget.TintManager.getDrawable(TintManager.java:168)
                                                                        at android.support.v7.widget.AppCompatImageHelper.setImageResource(AppCompatImageHelper.java:51)
                                                                        at android.support.v7.widget.AppCompatImageView.setImageResource(AppCompatImageView.java:72)
                                                                        at igor.com.totalsoulbeta.CustomPagerAdapter.instantiateItem(CustomPagerAdapter.java:46)

每张图片的大小不超过150kb。我的问题是：是否可以在没有OutOfMemoryError的情况下拍摄25张图像的动画？如果是，我需要在代码中更改什么？我如何清除heap以及我需要做什么？如果它不是动画的最佳方式，请告诉我您的变体

提前致谢！

Answer 1

ViewPager应该能够显示任意数量的页面。在任何时候它只有3页内存（除非您更改屏幕外页面限制）。问题可能在于Timer泄漏的东西。 documentation说：

当不再需要计时器时，用户应该调用cancel（），这就是释放计时器的线程和其他资源。定时器没有明确说明取消可能无限期地持有资源。

如果在Fragment中添加类似内容，会有帮助吗？：

@Override
public void onDestroyView() {
    super.onDestroyView();

    swipeTimer.cancel();
    swipeTimer = null;
}

ViewPager动画outOfMemoryError

1 个答案: