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你好 stackoverflow 我正在尝试开发一个显示 SD 卡中的图像并允许用户使用复选框删除图像的应用程序。我可以显示来自 SD 卡的图像，CheckBox但我无法删除用户动态勾选的特定图像。这是我的MainActivity.java

public class MainActivity extends Activity {
private int count;
private Bitmap[] thumbnails;
private boolean[] thumbnailsselection;
private String[] arrPath;
private ImageAdapter imageAdapter;
ArrayList<String> f = new ArrayList<String>();// list of file paths
File[] listFile;
Button btnDelete;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    getFromSdcard();
    GridView imagegrid = (GridView) findViewById(R.id.PhoneImageGrid);
    imageAdapter = new ImageAdapter();
    imagegrid.setAdapter(imageAdapter);

    imageAdapter.notifyDataSetChanged();

    btnDelete = (Button) findViewById(R.id.btnDeleteImg);

    btnDelete.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // to delete selected images

        }
    });
}

public void getFromSdcard() {
    File file = new File("/mnt/sdcard/Images");

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

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

            f.add(listFile[i].getAbsolutePath());

        }
    }
}

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.galleryitem, null);
            holder.imageview = (ImageView) convertView
                    .findViewById(R.id.thumbImage);

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

        Bitmap myBitmap = BitmapFactory.decodeFile(f.get(position));
        holder.imageview.setImageBitmap(myBitmap);
        return convertView;
    }
}

class ViewHolder {
    ImageView imageview;
}

}

我的activity_main.xml

<?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="fill_parent"
android:background="#FFFFFF"
android:orientation="vertical" >

<GridView
    android:id="@+id/PhoneImageGrid"
    android:layout_width="fill_parent"
    android:layout_height="0dip"
    android:layout_weight="0.97"
    android:columnWidth="90sp"
    android:gravity="center"
    android:horizontalSpacing="10sp"
    android:numColumns="auto_fit"
    android:stretchMode="columnWidth"
    android:verticalSpacing="10sp" />

<RelativeLayout
    android:id="@+id/rlBookmark"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:background="#ffffff"
    android:layout_gravity="bottom" >

    <Button
        android:id="@+id/btnBookmark"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:text="Clear"
        android:textColor="#FF0011"
        android:textSize="15sp"
        android:textStyle="normal" />
</RelativeLayout>

</LinearLayout>

最后是我的galleryitem.xml

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

<ImageView
    android:id="@+id/thumbImage"
    android:layout_width="100sp"
    android:layout_height="100sp" />

<CheckBox
    android:id="@+id/itemCheckBox"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentRight="true"
    android:layout_alignParentTop="true" />

</RelativeLayout>

请帮我解决这个谜语，在此先感谢stackoverflow。

4

2 回答 2

0

您可以参考这个带有复选框的示例图像，然后单击删除按钮获取图像名称并执行删除操作，如下所示：

File file= new File(Environment.getExternalStorageDirectory()+ "imageName");
if(file.exists())
{
     file.delete();
}
于 2013-07-23T05:41:44.357 回答
0

嗨stackoverflow，最后我想出了如何CheckBox在 a 中使用删除多个图像GridView

public class MainActivity extends Activity {
private int count;
private Bitmap[] thumbnails;
private boolean[] thumbnailsselection;
private String[] arrPath;
private ImageAdapter imageAdapter;
ArrayList<String> f = new ArrayList<String>();// list of file paths
File[] listFile;

Button btnDelete;

private ProgressDialog pd;

HashSet<String> selectedFile = new HashSet<String>();// list of file paths boolean checked

GridView imagegrid;

AlertDialog alertDialog = null;


@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getFromSdcard();
imagegrid = (GridView) findViewById(R.id.PhoneImageGrid);
imageAdapter = new ImageAdapter();
imagegrid.setAdapter(imageAdapter);

imageAdapter.notifyDataSetChanged();

btnDelete = (Button) findViewById(R.id.btnDeleteImg);

btnDelete.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v) {
        // to delete selected images

    }
});
}

public void getFromSdcard() {
File file = new File("/mnt/sdcard/Images");

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

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

        f.add(listFile[i].getAbsolutePath());

    }
}
}

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.galleryitem, null);
            holder.imageview = (ImageView) convertView.findViewById(R.id.thumbImage);
            holder.checkbox = (CheckBox) convertView.findViewById(R.id.itemCheckBox);

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

        Bitmap myBitmap = BitmapFactory.decodeFile(f.get(position));
        holder.imageview.setImageBitmap(myBitmap);

        final int pos = position;

        holder.checkbox.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                if(!selectedFile.contains((String)f.get(pos)))
                {
                    selectedFile.add((String)f.get(pos));
                }
                else
                {
                    selectedFile.remove((String)f.get(pos));
                }
            }
        });
        return convertView;
    }
}

class ViewHolder {
    ImageView imageview;
    CheckBox checkbox;
    int id;
}
}

这种方法对我有用，如果你们需要更多信息，请发表评论，谢谢stackoverflow

于 2013-07-23T10:19:57.760 回答