安卓：GridView的一片空白，而快速滚动 [英] Android: Gridview going blank while scrolling fast

问题描述

在GridView是一片空白android系统中，如果我很滚动速度快。

the GridView is going blank in android if i scroll very fastly

请给我一个解决方案。

在此先感谢..

这是我的code

gridView.setAdapter(new ImageAdapter(ChangedDashboard.this, stringarray));

这是它在GridView上设置我的适配器类

this is my adapter class which is set on the gridview

public class ImageAdapter extends BaseAdapter {
private Context context;
private final String[] menuvalues;

public ImageAdapter(Context context, String[] menuValues) {
    this.context = context;
    this.menuvalues = menuValues;
}
public View getView(int position, View convertView, ViewGroup parent) {

    LayoutInflater inflater = (LayoutInflater) context
    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    View gridView;

    if (convertView == null) {

        gridView = new View(context);

        // get layout from mobile.xml
        gridView = inflater.inflate(R.layout.changedashboard, null);

    } else {
        gridView = (View) convertView;
    }

    TextView textView = (TextView) gridView
    .findViewById(R.id.textView1);
    textView.setText(menuvalues[position]);

    // set image based on selected text
    ImageView imageView = (ImageView) gridView
    .findViewById(R.id.imageView1);

    String mobile = menuvalues[position];

    if (mobile.equals("1")) {
        imageView.setImageResource(R.drawable.new1);
    } else if (mobile.equals("2")) {
        imageView.setImageResource(R.drawable.new2);
    } else if (mobile.equals("3")) {
        imageView.setImageResource(R.drawable.new3);
    }else if (mobile.equals("4")) {
        imageView.setImageResource(R.drawable.new4);
    } else if (mobile.equals("5")) {
        imageView.setImageResource(R.drawable.new5);
    }else if (mobile.equals("6")) {
        imageView.setImageResource(R.drawable.new6);
    } 

    return gridView;
}

public int getCount() {
    return menuvalues.length;
}

public Object getItem(int position) {
    return null;
}

public long getItemId(int position) {
    return 0;
}

}

请给我这个解决方案

更新code

public class ImageAdapter extends BaseAdapter {
private Context context;
private final String[] menuvalues;

public ImageAdapter(Context context, String[] menuValues) {
    this.context = context;
    this.menuvalues = menuValues;
}
public View getView(int position, View convertView, ViewGroup parent) {

    LayoutInflater inflater = (LayoutInflater) context
    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    View gridView;

    if (convertView == null) {

        gridView = new View(context);

        // get layout from mobile.xml
        gridView = inflater.inflate(R.layout.changedashboard, null);
        ViewHolder holder = new ViewHolder();
        holder.textView = (TextView) gridView
                .findViewById(R.id.textView1);
        holder.imageView = (ImageView) gridView
                .findViewById(R.id.imageView1);
        gridView.setTag(holder);

    } else {
        gridView = (View) convertView;
    }

    /*TextView textView = (TextView) gridView
    .findViewById(R.id.textView1);*/


    // set image based on selected text
    /*ImageView imageView = (ImageView) gridView
    .findViewById(R.id.imageView1);*/

    String mobile = menuvalues[position];

    ViewHolder holder = (ViewHolder)gridView.getTag();
    holder.textView.setText(mobile);
    if (mobile.equals("1")) {
        holder.imageView.setImageResource(R.drawable.new1);
    } else if (mobile.equals("2")) {
        holder.imageView.setImageResource(R.drawable.new2);
    } else if (mobile.equals("3")) {
        holder.imageView.setImageResource(R.drawable.new3);
    }else if (mobile.equals("4")) {
        holder.imageView.setImageResource(R.drawable.new4);
    } else if (mobile.equals("5")) {
        holder.imageView.setImageResource(R.drawable.new5);
    }

    return gridView;
}

public int getCount() {
    return menuvalues.length;
}

public Object getItem(int position) {
    return null;
}

public long getItemId(int position) {
    return 0;
}
public static class ViewHolder {
    TextView textView;
    ImageView imageView;
}

}

推荐答案

用户 ViewHolder 办法。因为，每次滚动的时候，你发现通过ID意见，这需要一定的处理，可能会导致非常轻微的延迟造成的GridView闪烁。

User ViewHolder approach for re-using views. because, every time you scroll, you are finding views by id, which take some processing and may cause very minor delay causing GridView to blink.

下面是一些有用的链接获得ViewHolder的想法。

Here are some useful links to get idea of ViewHolder.

1. 为什么用ViewHolder pattren工作？


2. ViewHolder模式：缓存有效


3. Commonsware：AdapterViews和适配器看到ViewHolder部分专门

1. why does the ViewHolder pattren work?
2. ViewHolder pattern: caching effectively
3. Commonsware:AdapterViews and Adapters see ViewHolder part specifically.

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