我创建了一个应用程序，在ListView中显示来自互联网的一些listview图片。我想在GridView中显示它。我尝试使用基本适配器代替列表适配器！但这不起作用，因为它不能采取arg（arg在代码中）
有人可以帮助我在gridview中显示这些图片吗？
这是我的代码。
MainPage.java
public class MainPage extends ListActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setTitle("");
setContentView(R. layout. contacts_list);
final List<Model> list = new ArrayList<Model>();
/** This block is for getting the <span id="IL_AD9" class="IL_AD">image url</span> to <span id="IL_AD2" class="IL_AD">download from</span> the server **/
final GetDataFromDB getvalues = new GetDataFromDB();
final ProgressDialog dialog = ProgressDialog.show(MainPage.this,
"", "Gettting values from DB", true);
final CountDownLatch latch = new CountDownLatch(1);
new Thread (new Runnable() {
public void run() {
String response = getvalues.getImageURLAndDesciptionFromDB();
System.out.println("Response : " + response);
dismissDialog(dialog);
if (!response.equalsIgnoreCase("")) {
if (!response.equalsIgnoreCase("error")) {
dismissDialog(dialog);
// Got the response, now split it to get the image Urls and description
String all[] = response.split("##");
for(int k = 0; k < all.length; k++){
String urls_and_desc[] = all[k].split(","); // urls_and_desc[0] contains image url and [1] -> description.
list.add(get(urls_and_desc[1],urls_and_desc[0]));
}
}
} else {
dismissDialog(dialog);
}
latch.countDown();
}
}).start();
/*************************** GOT data from Server ********************************************/
try {
latch.await();
} catch (InterruptedException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
ArrayAdapter<Model> adapter = new MyCustomArrayAdapter(this, list);
setListAdapter(adapter);
ListView lv = getListView();
lv.setOnItemClickListener(new OnItemClickListener()
{
@Override
public void onItemClick(AdapterView<?> arg0, View arg1,int position, long arg3)
{
Intent intent = new Intent(MainPage.this, ViewImage.class);
Model model = list.get(position);
String myURL = model.getURL();
intent.putExtra("image", myURL);
startActivity(intent);}
});
}
public void dismissDialog(final ProgressDialog dialog){
runOnUiThread(new Runnable() {
public void run() {
dialog.dismiss();
}
});
}
private Model get(String s, String url) {
return new Model(s, url);
}
@Override
public void onBackPressed() {
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
this);
// set title
alertDialogBuilder.setTitle("Exit!");
// set dialog message
alertDialogBuilder
.setMessage("Are you sure you want to leave?")
.setCancelable(false)
.setPositiveButton("Yes",new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int id) {
// if this button is clicked, close
// current activity
MainPage.this.finish();
}
})
.setNegativeButton("No",new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int id) {
// if this button is clicked, just close
// the dialog box and do nothing
dialog.cancel();
}
});
// create alert dialog
AlertDialog alertDialog = alertDialogBuilder.create();
// show it
alertDialog.show();
}
// your code.
}
MyCustomArrayAdapter.java
public class MyCustomArrayAdapter extends ArrayAdapter<Model> {
private final Activity context;
private final List<Model> list;
public MyCustomArrayAdapter(Activity context, List<Model> list) {
super(context, R.layout.list_layout_relative, list);
this.context = context;
this.list = list;
}
static class ViewHolder {
protected TextView text;
protected ImageView image;
protected ProgressBar pb;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = null;
if (convertView == null) {
LayoutInflater inflator = context.getLayoutInflater();
view = inflator.inflate(R.layout.list_layout_relative, null);
final ViewHolder viewHolder = new ViewHolder();
viewHolder.text = (TextView) view.findViewById(R.id.label);
viewHolder.text.setTextColor(Color.BLACK);
viewHolder.image = (ImageView) view.findViewById(R.id.image);
viewHolder.image.setVisibility(View.GONE);
viewHolder.pb = (ProgressBar) view.findViewById(R.id.progressBar1);
view.setTag(viewHolder);
} else {
view = convertView;
}
ViewHolder holder = (ViewHolder) view.getTag();
holder.text.setText(list.get(position).getName());
holder.image.setTag(list.get(position).getURL());
holder.image.setId(position);
PbAndImage pb_and_image = new PbAndImage();
pb_and_image.setImg(holder.image);
pb_and_image.setPb(holder.pb);
new DownloadImageTask().execute(pb_and_image);
return view;
}
}
Model.java
public class Model {
private String name;
private String url;
public Model(String name, String url) {
this.name = name;
this.url = url;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getURL() {
return url;
}
public void setURL(String url) {
this.url = url;
}
}
我想问别的东西。克林达离开话题..我正在从网址下载图片并在gridview中显示。但它会下载需要大量数据的巨大图像。无论如何，我可以下载缩略图到该图像，以减少数据使用？
答案 0 :(得分：2)
相同的代码，但不是扩展listActivity扩展普通活动，并使用带有id foo或任何你想要的GridView定义xml。
GridView foo = (GridView) findViewById(R.id.foo);
ArrayAdapter<Model> adapter = new MyCustomArrayAdapter(this, list);
foo.setAdapter(adapter);