Question

我正在尝试从数组中加载图像列表。我在列表中得到了图像。现在我需要为列表中的每个图像添加一个文本。有人可以帮我弄这个吗？我是Android的新手。

public class EfficientAdapter extends BaseAdapter {
    public EfficientAdapter(Context c) {
        mContext = c;
    }

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

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

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

    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView i = new ImageView(mContext);
        i.setImageResource(mImageIds[position]);
        i.setScaleType(ImageView.ScaleType.FIT_END);
        i.setLayoutParams(new ListView.LayoutParams(60, 60));
        return i;
    }

    private Context mContext;
    private Integer[] mImageIds = { R.drawable.video3, R.drawable.video5, R.drawable.music2, };
}

这是我的代码，我从数组中加载了图像列表。请帮我这个代码。

Answer 1

您可以执行类似

的操作

public View getView(int position, View convertView, ViewGroup parent) 
{
    // Create a linear layout to hold other views
    LinearLayout oItemViewLayout = new LinearLayout(mContext);

    // ImageView
    ImageView i = new ImageView(mContext);
    i.setImageResource(mImageIds[position]);
    i.setScaleType(ImageView.ScaleType.FIT_END);
    i.setLayoutParams(new ListView.LayoutParams(60,60));

    // Add ImageView to item view layout
    oItemViewLayout.addView(i);

    // TextView
    TextView lblTextView = new TextView(mContext);
    lblTextView.setText(mImageNames[position]);

    // Add ImageView to item view layout
    oItemViewLayout.addView(lblTextView);

    return oItemViewLayout;
}

你还定义了一个字符串数组来保存图像的名称，也许就像

private String[] mImageNames = {"title of video3", "video5", "music2",};

如果为ListItem创建一个布局并加载它来创建视图会更容易

创建名为“mylistview.xml”的布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content"
    android:orientation="vertical" >
            <ImageView 
                android:id="@+id/ITEMVIEW_imgImage" 
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                />
            <TextView 
                android:id="@+id/ITEMVIEW_lblText" 
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                />
</LinearLayout>

然后您可以像这样制作getView()方法

public View getView(int position, View convertView, ViewGroup parent) 
{
    // Create a new view or recycle one if available
    View oItemViewLayout;
    if (convertView == null)
    {
        // New view needs to be created
        oItemViewLayout = (View)LayoutInflater.from(mContext).inflate(R.layout.mylistview, parent, false);
    }
    else
    {
        // Recycle an existing view
        oItemViewLayout = (View)convertView;
    }

    // ImageView
    ImageView i = (ImageView)oItemViewLayout.findViewById(R.id.ITEMVIEW_imgImage);
    i.setImageResource(mImageIds[position]);

    // TextView
    TextView lblTextView = (TextView)oItemViewLayout.findViewById(R.id.IITEMVIEW_lblText);
    lblTextView.setText(mImageNames[position]);

    return oItemViewLayout;
}

通过允许您使用XML设计视图，这不仅会让生活变得更轻松，而且还会更有效率，因为您将重新回收已经离开屏幕但仍然在内存中的视图，因为您抓住了{{1}当有一个实例时。

如何使用自定义listView？

1 个答案: