ViewPager 滑动时速度太慢

Question

我正在尝试用 Java 在 Android 上做我自己的滑块。在问这个问题之前，我做了很多研究，但我找不到任何解决办法。

我的 ViewPager 在 API 21 上滑动时太慢了，但在 API 23 或更高版本上很好。

这些但是我没能成功:

我试过 viewPager.setOffscreenPageLimit(0);
我试过调整图片大小。
我曾尝试使用 Glide，但后来转回 setImageResource。
- 3.1 我试过了DiskCacheStrategy.ALL
我尝试使用 RecyclerView 而不是 ViewPager，但同样的滚动卡住了。
- 4.1 我试过了 recyclerView.setHasFixedFixedSize(true);
- 4.2 我没有在onBindViewHolder
即使我没有将任何图像放入 ImageView 仍然继续。你可以在下面看到我的代码。

Activity:

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.activity_timeline);

        //Slider Process
        ViewPager slider = findViewById(R.id.vpSlider);
        ViewPagerIndicator pagerIndicator = findViewById(R.id.vpiTimeline);
        SliderAdapter sliderAdapter = new SliderAdapter(slider.getContext(),listSliderUrl());
        slider.setAdapter(sliderAdapter);
        slider.setOffscreenPageLimit(10);
        pagerIndicator.setupWithViewPager(slider);

ViewPager 适配器：

public class SliderAdapter extends PagerAdapter {

private Context context;
private List<Integer> urls;
private LayoutInflater inflater;

public SliderAdapter(Context context, List<Integer> urls) {
    this.context = context;
    this.urls = urls;
}

@Override
public int getCount() {
    return urls.size();
}

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

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

@NonNull
@Override
public Object instantiateItem(@NonNull ViewGroup container, int position) {
    inflater = 

(LayoutInflater)context.getSystemService(context.LAYOUT_INFLATER_SERVICE);
//        View view = LayoutInflater.from(context).inflate(R.layout.item_slider,container,false);
        View view = inflater.inflate(R.layout.item_slider,container,false);
        ImageView iv = view.findViewById(R.id.ivSlider);
//        GlideApp.with(context).load(urls.get(position)).diskCacheStrategy(DiskCacheStrategy.ALL).into(iv);
        iv.setImageResource(urls.get(position));
        container.addView(view);
        return view;
    }
}

回收器视图适配器：

public class RecyclerViewSliderAdapter extends RecyclerView.Adapter {

Context context;
List<Integer> urls;

public RecyclerViewSliderAdapter(Context context, List<Integer> urls) {
    this.context = context;
    this.urls = urls;
}

@NonNull
@Override
public ViewHolderSlider onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    View layoutView = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_slider,parent,false);
    ViewHolderSlider viewHolderSlider = new ViewHolderSlider(layoutView);
    return viewHolderSlider;
}

@Override
public void onBindViewHolder(@NonNull ViewHolderSlider holder, int position) {
    holder.bindData(urls.get(position));
}

@Override
public int getItemCount() {
    return urls.size();
}


}
class ViewHolderSlider extends RecyclerView.ViewHolder{

ImageView ivSlider;
public ViewHolderSlider(View itemView) {
    super(itemView);
    ivSlider = (ImageView)itemView.findViewById(R.id.ivSlider);
}
public void bindData(final Integer url){
    ivSlider.setImageResource(url);
}}


//这是我的item_slider.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <ImageView
        android:id="@+id/ivSlider"
        android:layout_width="match_parent" android:layout_height="match_parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:scaleType="centerCrop"
        app:layout_constraintBottom_toBottomOf="parent" android:layout_margin="0dp"/>
    <ImageView
        android:id="@+id/ivGradient"
        android:layout_width="match_parent"
        android:layout_height="111dp"
        android:layout_margin="0dp"
        android:src="@mipmap/gradient"
        android:scaleType="fitXY"
        app:layout_constraintBottom_toBottomOf="@id/ivSlider"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />
    <TextView
        android:id="@+id/tvSliderHeader"
        android:layout_width="match_parent"
        android:fontFamily="@font/opensans_light"
        android:textSize="11sp"
        android:textColor="@color/yellow"
        android:layout_height="wrap_content"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintBottom_toTopOf="@id/tvSliderTitle"
        android:layout_marginBottom="7dp"
        android:layout_marginStart="32dp"
        android:text="@string/dunya" />
    <TextView
        android:id="@+id/tvSliderTitle"
        android:textSize="24sp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintBottom_toBottomOf="@id/ivSlider"
        android:layout_marginBottom="26dp"
        android:layout_marginStart="31dp"
        android:textColor="@color/white"
        android:textStyle="bold"
        android:text="TÜRKİYE'YE KARŞI\nHİSLERİM DEĞİŞTİ" />
</android.support.constraint.ConstraintLayout>

Answer 1

这实际上是内存泄漏，我在ConstraintLayout 中使用ViewPager，我将ConstraintLayout 更改为LinearLayout，问题解决了！如果你有这样的烦恼，就换个外部布局试试吧。

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