我正在努力展示多组图片。我使用列表视图显示每个组。每个组内部都有一个文本视图，复选框和网格视图。 在网格视图中，我必须显示相应组的每个图像。 这是我的Listview适配器类：
public class CustomListAdapter extends BaseAdapter implements CompoundButton.OnCheckedChangeListener {
private Context listapadptercontext;
private List<IndividualGroup> listData;
private LayoutInflater layoutInflater;
GridViewAdapter mAdapter;
GridLayoutManager layoutManager;
public CustomListAdapter(Context _c,List<IndividualGroup> _listdata){
this.listapadptercontext = _c;
this.listData = _listdata;
this.layoutInflater = (LayoutInflater) listapadptercontext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
return listData.size();
}
@Override
public Object getItem(int position) {
return listData.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder=null;
if (convertView == null) {
convertView = layoutInflater.inflate(R.layout.group_heading, null);
holder = new ViewHolder();
holder.textView = (TextView) convertView.findViewById(R.id.textView1);
holder.checkBox = (CheckBox) convertView.findViewById(R.id.grpcheckbox);
holder.myGridView = (MyGridView) convertView.findViewById(R.id.gridView);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
IndividualGroup individualGroup = listData.get(position);
holder.textView.setText("Set" + (position + 1));
holder.checkBox.setOnCheckedChangeListener(this);
layoutManager = new GridLayoutManager(listapadptercontext, 4);
mAdapter = new GridViewAdapter(listapadptercontext,0,individualGroup.getIndividualgrpofdupes());
holder.myGridView.setAdapter(mAdapter);
return convertView;
}
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// IndividualGroup individualGroup = listData.get()
}
static class ViewHolder {
TextView textView;
CheckBox checkBox;
MyGridView myGridView;
}
}
我的Gridview适配器：
public class GridViewAdapter extends ArrayAdapter
{
private Context context;
private int layoutResourceId;
private LayoutInflater inflater;
private List<String> data = new ArrayList<String>();
public GridViewAdapter(Context context,int layoutResourceId, List<String> data) {
super(context,layoutResourceId,data);
this.layoutResourceId = layoutResourceId;
this.context = context;
this.data = data;
this.inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount()
{
return data.size();
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
ViewHolder holder;
if (row == null) {
row = inflater.inflate(R.layout.group_duplicate_image, parent, false);
holder = new ViewHolder(row);
holder.image = (SquareImageView) row.findViewById(R.id.img_duplicate_image);
holder.checkBox = (CheckBox) row.findViewById(R.id.individualcheckbox);
row.setTag(holder);
} else {
holder = (ViewHolder) row.getTag();
}
String item = data.get(position);
if (holder.image != null) {
new GridviewLoader(context,holder.image).execute(item);
}
return row;
}
class ViewHolder implements CompoundButton.OnCheckedChangeListener {
SquareImageView image;
CheckBox checkBox;
ViewHolder(View view){
// super(view);
image = (SquareImageView) view.findViewById(R.id.img_duplicate_image);
checkBox = (CheckBox) view.findViewById(R.id.individualcheckbox);
checkBox.setOnCheckedChangeListener(this);
}
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// ImageItem imageItem = data.get(position);
}
}
}
我的gridviewloader（异步任务）：
public class GridviewLoader extends AsyncTask<String,Void,Bitmap> {
private final WeakReference<ImageView> imageViewReference;
Context imageloadercontext;
public GridviewLoader(Context c,ImageView imageView) {
imageViewReference = new WeakReference<ImageView>(imageView);
this.imageloadercontext = c;
}
@Override
protected Bitmap doInBackground(String... params) {
// CommonlyUsed.logmsg("%%%%%%------Filepath: "+params[0]);
Bitmap bmp = BitmapLoader.loadBitmap(params[0], 100, 100);
return bmp;
}
// @TargetApi(Build.VERSION_CODES.LOLLIPOP)
@Override
protected void onPostExecute(Bitmap bitmap) {
super.onPostExecute(bitmap);
if (isCancelled()) {
bitmap = null;
}
if (imageViewReference != null) {
ImageView imageView = imageViewReference.get();
if (imageView != null) {
if (bitmap != null) {
imageView.setImageBitmap(bitmap);
} else {
Drawable placeholder = imageView.getContext().getResources().getDrawable(R.drawable.rsz_empty_photo);
imageView.setImageDrawable(placeholder);
}
}
}
}
}
我的问题是图像最初显示。但在向下滚动后，它就会消失。并且需要花费太多时间再次加载。 这是我的布局：
内部列表视图。
<?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">
<LinearLayout
style="@style/linearLayoutStyleNoBgColor"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/deepyellow">
<TextView
android:id="@+id/textView1"
style="@style/textFieldStyleType1WithCheckbox"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center|right"
android:textColor="@color/white"
android:textSize="15dp" />
<CheckBox
style="@style/checkboxStyleType1"
android:id="@+id/grpcheckbox"
android:layout_width="20dp"
android:layout_height="20dp"
android:layout_alignRight="@+id/img_duplicate_image"
android:layout_gravity="center|right"
android:button="@null"
android:background="@drawable/customcheckbox" />
</LinearLayout>
<!-- <android.support.v7.widget.RecyclerView
android:id="@+id/rv_duplicates"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scrollbars="vertical"/>-->
<com.xxx.xxx.customviews.MyGridView
android:id="@+id/gridView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="2dp"
android:clickable="true"
android:columnWidth="100dp"
android:drawSelectorOnTop="true"
android:focusable="true"
android:gravity="center"
android:numColumns="4"
android:stretchMode="columnWidth"
android:verticalSpacing="5dp" />
</LinearLayout>
网格内部视图：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/imagelayout"
android:weightSum="1">
<com.remodupes.remoactivities.customviews.SquareImageView
android:id="@+id/img_duplicate_image"
android:layout_width="100dp"
android:layout_height="100dp"
android:contentDescription="@null"
android:padding="2dp"
android:scaleType="fitXY"/>
<CheckBox
android:layout_width="20dp"
android:layout_height="20dp"
android:id="@+id/individualcheckbox"
android:layout_alignRight="@+id/img_duplicate_image"
android:button="@null"
android:background="@drawable/customcheckbox"
android:layout_alignBottom="@+id/img_duplicate_image" />
</RelativeLayout>
那么我该如何解决这个问题呢。
答案 0 :(得分：1)
有一种方法可以使用列表加载图像，您可以使用图像加载器或毕加索
对毕加索我建议你blog for your problem 你可以像将毕加索的jar添加到你的模块中一样使用它
Picasso.
with(State.mainContext).
load(parseImageFile.getUrl()).
into(null);