我正在寻找一些帮助来解决为什么 GridView 不显示正确数量的缩略图而是在组中显示大量重复的缩略图的问题？当我上下滚动缩略图列表并返回顶部时，图像的顺序一直在变化。
谁知道可能是什么原因以及如何解决？也许有更好的方法来创建缩略图的 GridView？还是我的手机？我使用的是带有 Android 版本 2.3.3 的 Samsung Young。我读到HTC也有类似的问题。
我真的很感激能够继续我的工作的一些帮助。谢谢！
下面是代码：
public class MainActivity extends Activity {
Cursor cursor;
int indexColumn;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Array for the columns to access
String[] projection = {MediaStore.Images.Thumbnails._ID};
// Cursor object
cursor = managedQuery(MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, projection, null, null, MediaStore.Images.Thumbnails.IMAGE_ID);
// Number of columns
indexColumn = cursor.getColumnIndexOrThrow(MediaStore.Images.Thumbnails._ID);
GridView gridview = (GridView) findViewById(R.id.gridview);
gridview.setAdapter(new ImageAdapter(this)); // Send this class to constructor
/*
gridview.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
Toast.makeText(MainActivity.this, "" + position, Toast.LENGTH_SHORT).show();
}
});
*/
gridview.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
// Sending image id to FullScreenActivity
Intent i = new Intent(getApplicationContext(), FullImageActivity.class);
// passing array index
i.putExtra("id", position);
startActivity(i);
}
});
}
// Nested class
public class ImageAdapter extends BaseAdapter {
private Context mContext;
// Constructor
public ImageAdapter(Context c) {
mContext = c;
}
public int getCount() {
return cursor.getCount();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
// create a new ImageView for each item referenced by the Adapter
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView;
if (convertView == null) { // if it's not recycled, initialize some attributes
imageView = new ImageView(mContext);
// Move cursor to current position
cursor.moveToPosition(position);
// Get the current value value for the requested column
int imageId = cursor.getInt(indexColumn);
// Set content of the image
imageView.setImageURI(Uri.withAppendedPath(MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, "" + imageId));
imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(8, 8, 8, 8);
} else {
imageView = (ImageView) convertView;
}
//imageView.setImageResource(mThumbIds[position]);
return imageView;
}
}
}