Java 在gridview中加载的图像在滚动时更改其位置
嗨,我遇到了这样的问题,当滚动图像视图改变它们的位置时。我在这个网站上看到了关于这个话题的其他答案,但没有一个对我有帮助 这是我的班级:Java 在gridview中加载的图像在滚动时更改其位置,java,android,android-gridview,lazylist,Java,Android,Android Gridview,Lazylist,嗨,我遇到了这样的问题,当滚动图像视图改变它们的位置时。我在这个网站上看到了关于这个话题的其他答案,但没有一个对我有帮助 这是我的班级: public class MainActivity extends Activity { private GridView grid; private GridAdapter adapter; @Override protected void onCreate(Bundle savedInstanceState) {
public class MainActivity extends Activity {
private GridView grid;
private GridAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
grid = (GridView) findViewById(R.id.gridView1);
Vector<HashMap<String, String>> vData = new Vector<HashMap<String,String>>();
for (int i=0; i<10; i++) {
String name = "Name "+ (i+1);
String desc = "Description "+ (i+1);
HashMap<String, String> hData = new HashMap<String, String>();
hData.put("name", name);
hData.put("desc", desc);
vData.addElement(hData);
}
adapter = new GridAdapter(vData);
grid.setAdapter(adapter);
grid.setNumColumns(2);
File cacheDir = StorageUtils.getCacheDirectory(this);
ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(this)
.memoryCacheExtraOptions(480, 800) // default = device screen dimensions
.discCacheExtraOptions(480, 800, CompressFormat.JPEG, 75, null)
.threadPoolSize(10) // default
.threadPriority(Thread.NORM_PRIORITY - 1) // default
.tasksProcessingOrder(QueueProcessingType.FIFO) // default
.denyCacheImageMultipleSizesInMemory()
.memoryCache(new LruMemoryCache(2 * 1024 * 1024))
.memoryCacheSize(10 * 1024 * 1024)
.memoryCacheSizePercentage(30) // default
.discCache(new UnlimitedDiscCache(cacheDir)) // default
.discCacheSize(80 * 1024 * 1024)
.discCacheFileCount(100)
.discCacheFileNameGenerator(new HashCodeFileNameGenerator()) // default
.imageDownloader(new BaseImageDownloader(this)) // default
.imageDecoder(new BaseImageDecoder()) // default
.defaultDisplayImageOptions(DisplayImageOptions.createSimple()) // default
.build();
ImageLoader.getInstance().init(config);
}
//sub class
class GridAdapter extends BaseAdapter {
Vector<HashMap<String,String>> vData;
GridAdapter(Vector<HashMap<String,String>> vData) {
this.vData = vData;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return vData.size();
}
@Override
public Object getItem(int index) {
// TODO Auto-generated method stub
return vData.elementAt(index);
}
@Override
public long getItemId(int index) {
// TODO Auto-generated method stub
return index;
}
@Override
public View getView(int index, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
HashMap<String, String> hData = vData.elementAt(index);
View v;
if (convertView == null) {
LayoutInflater li = getLayoutInflater();
v = li.inflate(R.layout.grid_element, null);
// v = getLayoutInflater().inflate(R.layout.grid_element, parent, false);
} else {
v = convertView;
}
//TextView txtName = (TextView) v.findViewById(R.id.gridText);
//txtName.setText(hData.get("name"));
ImageView img = (ImageView) v.findViewById(R.id.gridImg);
ImageLoader.getInstance().displayImage("http://www.bourax.com/android/wall"+index+".jpg", img);
return v;
}
}
}
公共类MainActivity扩展活动{
私有网格视图;
专用网格适配器;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
grid=(GridView)findViewById(R.id.gridView1);
向量vData=新向量();
对于(int i=0;i@覆盖
公共视图getView(int索引、视图转换视图、视图组父级){
//TODO自动生成的方法存根
HashMap hData=vData.elementAt(索引);
观点五;
图像视图img;
if(convertView==null){
LayoutInflater li=getLayoutInflater();
v=li.充气(R.布局.网格元素,空);
//v=GetLayoutFlater().充气(R.layout.grid_元素,父元素,false);
img=(ImageView)v.findViewById(R.id.gridImg);
}否则{
v=转换视图;
}
//TextView txtName=(TextView)v.findViewById(R.id.gridText);
//setText(hData.get(“name”));
ImageLoader.getInstance().displayImage(“http://www.bourax.com/android/wall“+索引+”.jpg“,img);
返回v;
}
相应地更改代码…实际上,当convertView为空时,当前需要初始化所有视图才能显示在活动上…这就是为什么ImageView需要处于if状态
@Override
public View getView(int index, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
HashMap<String, String> hData = vData.elementAt(index);
View v;
ImageView img;
if(convertView == null){
LayoutInflater li = getLayoutInflater();
v = li.inflate(R.layout.grid_element, null);
// v = getLayoutInflater().inflate(R.layout.grid_element, parent, false);
img = (ImageView) v.findViewById(R.id.gridImg);
}else{
v = convertView;
}
//TextView txtName = (TextView) v.findViewById(R.id.gridText);
//txtName.setText(hData.get("name"));
ImageLoader.getInstance().displayImage("http://www.bourax.com/android/wall"+index+".jpg", img);
return v;
}