1

我正在根据其中一个子项的文本值设置行的背景颜色。但是，无论其文本值如何，都会设置多个背景。上下滚动时会变得更糟。适配器的代码：

package com.test.app;

import java.util.ArrayList;

import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

public class MyBaseAdapter extends BaseAdapter {

    private LayoutInflater mInflater = null;
    private ArrayList<String[]> mItems = new ArrayList<String[]>();

    public MyBaseAdapter(Context context, ArrayList<String[]> items) {
         mItems = items;
         mInflater = LayoutInflater.from(context);
    }

    public void addItem(String[] it) {
        mItems.add(it);
    }

    public void setListItems(ArrayList<String[]> lit) {
        mItems = lit;
    }

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

    @Override
    public Object getItem(int position) {
        return mItems.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    static class ViewHolder {
        public TextView tv0,tv1;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {

        View rowView = null;
        ViewHolder viewHolder;

        if(convertView == null)
        {
            rowView = mInflater.inflate(R.layout.history_row, null);
        }
        else
        {
            rowView = convertView;
        }

        viewHolder = new ViewHolder();

        viewHolder.tv0 = (TextView)rowView.findViewById(R.id.textView0);
        viewHolder.tv1 = (TextView)rowView.findViewById(R.id.textView1);

        rowView.setTag(viewHolder);

        ViewHolder holder = (ViewHolder) rowView.getTag();

        holder.tv0.setText(mItems.get(position)[0].toString());
        holder.tv1.setText(mItems.get(position)[1].toString());

        if(holder.tv1.getText().equals("0"))
        {
            rowView.setBackgroundColor(0xAA777777);
            // Only the row containing "0" should be colored, yet it colors multiple, random rows.
        }

        return rowView;
    }

}
4

2 回答 2

4

如果你只是使用：

if(holder.tv1.getText().equals("0")) {
            rowView.setBackgroundColor(0xAA777777);
            // Only the row containing "0" should be colored, yet it colors multiple, random  rows.
}

这确实会使包含的行0具有该特定颜色，但是当您上下滚动列表时，具有这种颜色的这个特定行将被回收并最终出现在不应该出现的地方。正确的方法是为不包含的行提供默认颜色，0以便覆盖可能回收视图的错误颜色：

if(holder.tv1.getText().equals("0")) {
            rowView.setBackgroundColor(0xAA777777);
            // Only the row containing "0" should be colored, yet it colors multiple, random  rows.
} else {
   rowView.setBackgroundColor(/*Here the default color will be*/)
   // This row doesn't contain 0 so it must have the default color.
  // Because you could be dealing with a recycled view(that has the above color)
 // then we must revert the color to the default to be sure we end up with the correct color.
}

该ViewHolder模式的正确代码也是：

    View rowView = convertView;
    ViewHolder viewHolder;

    if(rowView == null) {
        rowView = mInflater.inflate(R.layout.history_row, parent, false);
        viewHolder = new ViewHolder();
        viewHolder.tv0 = (TextView)rowView.findViewById(R.id.textView0);
        viewHolder.tv1 = (TextView)rowView.findViewById(R.id.textView1);
        rowView.setTag(viewHolder);
    } else {
        viewHolder = (ViewHolder) rowView.getTag();    
    }

然后您使用该viewHolder对象来设置该行的数据。

于 2012-05-02T06:28:15.787 回答
0

你可以试试，设置为ListView：android:cacheColorHint="#00000000"

于 2012-05-02T03:07:16.490 回答