ArrayAdapter 文本和图像

问题描述 投票：0回答：4

在我的活动中，我实现了一个包含一些文件名称的列表。 每个列表的项目都引用一个布局，我想在其中显示图像的名称和引用的图像的缩略图。我可以使用 ArrayAdapter 显示名称，但我不知道插入图像缩略图。 所有引用的图像都保留在 sd_card 中，我有它们的路径。 这是单行布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="50dp"
    android:orientation="horizontal" >

<ImageView
    android:id="@+id/imageView"
    android:layout_width="36dp"
    android:layout_height="wrap_content"
    android:src="@drawable/btn_nav_background_default" />

<TextView
    android:id="@+id/titoloTv"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceMedium" />

</LinearLayout>

以及活动的布置

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

<Button
    android:id="@+id/creaButton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center_horizontal"
    android:text="Crea una nuova realtà aumentata" />

<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center_horizontal"
    android:text="Ar già create"
    android:textAppearance="?android:attr/textAppearanceLarge" />

<ListView
    android:id="@+id/listView1"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >


</ListView>

</LinearLayout>

以及活动代码固有的适配器。

    ArrayAdapter<?> arrayAdapter = new ArrayAdapter<String>(this,R.layout.row,R.id.titoloTv,targetName);
    listView.setAdapter(arrayAdapter);

    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {  
           @Override  
           public void onItemClick(AdapterView<?> adapter, final View componente, int pos, long id){

...................            
           } 

    });

我正在尝试使用此功能，但无法正常工作。

    String tempTarget;
    List<Map<String,Object>> data = new ArrayList<Map<String,Object>>();

   for(int i = 0; i<ARelements.size();i++){
        Element ar = arIterator.next();

        Map<String,Object> map = new HashMap<String,Object>(2);
        tempTarget = ar.getAttributeValue("TARGET");
        thumbnailBitmap = ThumbnailUtils.extractThumbnail(BitmapFactory.decodeFile(tempTarget), THUMBSIZE, THUMBSIZE);
        map.put("thumbnail", thumbnailBitmap);
        map.put("titolo", tempTarget);
        data.add(map);
    }
   arIterator= null;

   SimpleAdapter simpleAdapter = new SimpleAdapter(this,data,R.layout.row,new String[] {"thumbnail","titolo"},new int[] {R.id.imageView, R.id.titoloTv});


    listView.setAdapter(simpleAdapter);
android image adapter
4个回答
15
投票

您需要实现一个自定义数组适配器并在适配器中指定 imageview 和 textview 布局/id。

类似：

  public class CustomListViewAdapter extends ArrayAdapter<RowItem> {


    Context context;

    public CustomListViewAdapter(Context context, int resourceId, //resourceId=your layout
            List<RowItem> items) {
        super(context, resourceId, items);
        this.context = context;
    }

    /*private view holder class*/
    private class ViewHolder {
        ImageView imageView;
        TextView txtTitle;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder = null;
        RowItem rowItem = getItem(position);

        LayoutInflater mInflater = (LayoutInflater) context
                .getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
        if (convertView == null) {
            convertView = mInflater.inflate(R.layout.list_item, null);
            holder = new ViewHolder();
            holder.txtTitle = (TextView) convertView.findViewById(R.id.title);
            holder.imageView = (ImageView) convertView.findViewById(R.id.icon);
            convertView.setTag(holder);
        } else
            holder = (ViewHolder) convertView.getTag();

        holder.txtTitle.setText(rowItem.getTitle());
        holder.imageView.setImageResource(rowItem.getImageId());

        return convertView;
    }
}

然后：

listView = (ListView) findViewById(R.id.list);
        CustomListViewAdapter adapter = new CustomListViewAdapter(this,
                R.layout.list_item, rowItems);
        listView.setAdapter(adapter);
        listView.setOnItemClickListener(this);
    }


@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
        long id) {
    Toast toast = Toast.makeText(getApplicationContext(),
        "Item " + (position + 1) + ": " + rowItems.get(position),
        Toast.LENGTH_SHORT);
    toast.show();
}

也请参阅扩展其他适配器，了解 ListView 及其自定义实现：
例如。 http://theopentutorials.com/tutorials/android/listview/android-custom-listview-with-image-and-text-using-arrayadapter/

6
投票

您不一定需要自定义 ArrayAdapter，SimpleAdapter 就可以解决缩略图/文本组合的问题。您可以将缩略图的路径和所需的文本存储在 HashMap 数组中，然后使用 SimpleAdapter 应用它。例如，如果您有 5 个缩略图 + 文本以及每个缩略图的数组：

List<Map<String, Object>> data = new ArrayList<Map<String, Object>>();
for (int i = 0; i < 5; i++) {
            Map<String, Object> datum = new HashMap<String, Object>(2);
            datum.put("thumbnail", thumbnail[i]);
            datum.put("name", text[i]);
            data.add(datum);
        }
YourListViewId.setAdapter(new SimpleAdapter(this, data, R.layout.yoursinglerowlayout, new String[] {"thumbnail","name"}, new int[] {R.id.imageView, R.id.titoloTv}));
1
投票

首先：您必须将 ArrayAdapter 更改为 BaseAdapter，因为 BaseAdapter 为您提供了更大的视图灵活性。尝试使用此代码并看看它是如何工作的：

这是我如何从 SD 卡获取图像并将其填充到列表视图中

public class GetSdCardContent extends Activity {

    public static Cursor cursor;
    private int columnIndex;
    private File file;
    private String SD_CARD_ROOT;
    ArrayList<String> f = new ArrayList<String>(); 
    File[] listFile;
    ImageAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        
        super.onCreate(savedInstanceState);
        setContentView(R.layout.sdcard_layout);
        

        getSdcardImages();
        
        
        ListView lv1 = (ListView) findViewById(R.id.sdlistView1);
        adapter = new ImageAdapter();
        lv1.setAdapter(adapter);

    }


    public void getSdcardImages() {
        File file = new File(
                android.os.Environment.getExternalStorageDirectory().getPath(),
                "Pictures");

        
        if (file.isDirectory()) {
            listFile = file.listFiles();

            for (int i = 0; i < listFile.length; i++) {

                f.add(listFile[i].getAbsolutePath());
                Log.i("FILES:"+"---", f.toString());

            }
        }
    }

这是我正在使用的适配器。它是一个基本适配器，我现在只获得图像。如果需要，您还可以添加 TextView。

    public class ImageAdapter extends BaseAdapter {
        private LayoutInflater mInflater;

        public ImageAdapter() {
            mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        }

        public int getCount() {
            return f.size();
        }

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

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

        public View getView(int position, View convertView, ViewGroup parent) {
            ViewHolder holder;
            if (convertView == null) {
                holder = new ViewHolder();
                convertView = mInflater.inflate(R.layout.custom_listview_items,
                        null);
                holder.imageview = (ImageView) convertView
                        .findViewById(R.id.customimageView1);

                convertView.setTag(holder);
            } else {
                holder = (ViewHolder) convertView.getTag();
            }

            Bitmap myBitmap = BitmapFactory.decodeFile(f.get(position));
            try {
                
                holder.imageview.setImageBitmap(getResizedBitmap(myBitmap, 300, 300));
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            return convertView;
        }
    }

此方法适用于位图，如果您想调整图像和其他内容的大小：

    public Bitmap getResizedBitmap(Bitmap bm, int newHeight, int newWidth) {
        int width = bm.getWidth();
        int height = bm.getHeight();
        float scaleWidth = ((float) newWidth) / width;
        float scaleHeight = ((float) newHeight) / height;
        // CREATE A MATRIX FOR THE MANIPULATION
        Matrix matrix = new Matrix();
        // RESIZE THE BIT MAP
        matrix.postScale(scaleWidth, scaleHeight);

        // "RECREATE" THE NEW BITMAP
        Bitmap resizedBitmap = Bitmap.createBitmap(bm, 0, 0, width, height, matrix, false);
        return resizedBitmap;
    }
    class ViewHolder {
        ImageView imageview;

    }
}

最后一部分：两种布局。

一：项目的布局。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <ImageView
        android:id="@+id/customimageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/bluebutton" />

</LinearLayout>

第二：主要布局。 （列表视图）

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

     <ListView
        android:id="@+id/sdlistView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
    </ListView> 


</LinearLayout>
0
投票

我已经用这个类解决了它

public class ExtendedSimpleAdapter extends SimpleAdapter{
List<HashMap<String, Object>> map;
String[] from;
int layout;
int[] to;
Context context;
LayoutInflater mInflater;
public ExtendedSimpleAdapter(Context context, List<HashMap<String, Object>> data,
        int resource, String[] from, int[] to) {
    super(context, data, resource, from, to);
    layout = resource;
    map = data;
    this.from = from;
    this.to = to;
    this.context = context;
}


@Override
public View getView(int position, View convertView, ViewGroup parent) {
mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
return this.createViewFromResource(position, convertView, parent, layout);
}

private View createViewFromResource(int position, View convertView,
    ViewGroup parent, int resource) {
View v;
if (convertView == null) {
    v = mInflater.inflate(resource, parent, false);
} else {
    v = convertView;
}

this.bindView(position, v);

return v;
}


private void bindView(int position, View view) {
final Map dataSet = map.get(position);
if (dataSet == null) {
    return;
}

final ViewBinder binder = super.getViewBinder();
final int count = to.length;

for (int i = 0; i < count; i++) {
    final View v = view.findViewById(to[i]);
    if (v != null) {
        final Object data = dataSet.get(from[i]);
        String text = data == null ? "" : data.toString();
        if (text == null) {
            text = "";
        }

        boolean bound = false;
        if (binder != null) {
            bound = binder.setViewValue(v, data, text);
        }

        if (!bound) {
            if (v instanceof Checkable) {
                if (data instanceof Boolean) {
                    ((Checkable) v).setChecked((Boolean) data);
                } else if (v instanceof TextView) {
                    // Note: keep the instanceof TextView check at the bottom of these
                    // ifs since a lot of views are TextViews (e.g. CheckBoxes).
                    setViewText((TextView) v, text);
                } else {
                    throw new IllegalStateException(v.getClass().getName() +
                            " should be bound to a Boolean, not a " +
                            (data == null ? "<unknown type>" : data.getClass()));
                }
            } else if (v instanceof TextView) {
                // Note: keep the instanceof TextView check at the bottom of these
                // ifs since a lot of views are TextViews (e.g. CheckBoxes).
                setViewText((TextView) v, text);
            } else if (v instanceof ImageView) {
                if (data instanceof Integer) {
                    setViewImage((ImageView) v, (Integer)     data);                            
                } else if (data instanceof Bitmap){
                    setViewImage((ImageView) v, (Bitmap)data);
                } else {
                    setViewImage((ImageView) v, text);
                }
            } else {
                throw new IllegalStateException(v.getClass().getName() + " is not a " +
                        " view that can be bounds by this SimpleAdapter");
            }
        }
    }
}
}



private void setViewImage(ImageView v, Bitmap bmp){
v.setImageBitmap(bmp);
}



}
最新问题
© www.soinside.com 2019 - 2024. All rights reserved.