我想创建一个动态GridView，当我点击我的选项meny时，我刷新我的asyncTask，然后我从postExecute得到所有结果，并通知我的适配器刷新！但我不工作请帮助我！
GridView grid;
ImageAdapter adapter;
ArrayList<String> arrayThumbs = new ArrayList<String>();
ArrayList<String> arrayBig_image = new ArrayList<String>();
ArrayList<String> arrayAuthor = new ArrayList<String>();
ArrayList<String> arrayDescription = new ArrayList<String>();
ArrayList<String> arrayDate = new ArrayList<String>();
String[] arraymThumbs;
String[] arrayBimages;
String[] arrayauthor;
String[] arraydescription;
String[] arraydate;
final static String TAG_ITEM = "img_list";
final static String TAG_THUMBNAILS = "thumbnail";
final static String TAG_BIG_IMAGE = "big_image";
final static String TAG_AUTHOR = "author";
final static String TAG_DESCRIPTION = "description";
final static String TAG_DATE = "event_date";
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
backTask();
grid = (GridView) findViewById(R.id.grid);
grid.setAdapter(adapter);
grid.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterview, View view, int position, long id) {
Intent intent = new Intent(MainActivity.this, ImageGallery.class);
intent.putExtra("position", position);
intent.putExtra("big_images", arrayBimages);
intent.putExtra("author", arrayauthor);
intent.putExtra("description", arraydescription);
intent.putExtra("date", arraydate);
startActivity(intent);
}
});
}
public boolean onCreateOptionsMenu(Menu menu){
getMenuInflater().inflate(R.menu.main, menu);
return super.onCreateOptionsMenu(menu);
}
public boolean onOptionsItemSelected(MenuItem item){
switch (item.getItemId()) {
case R.id.refresh:
backTask();
break;
}
return super.onOptionsItemSelected(item);
}
public void backTask(){
BackTask task = new BackTask();
task.execute();
try {
JSONObject result = task.get();
if(result != null){
JSONArray jarray = result.getJSONArray(TAG_ITEM);
for(int i = 0; i < jarray.length(); i++){
JSONObject jrss = jarray.getJSONObject(i);
arrayThumbs.add(jrss.getString(TAG_THUMBNAILS));
arrayBig_image.add(jrss.getString(TAG_BIG_IMAGE));
arrayAuthor.add(jrss.getString(TAG_AUTHOR));
arrayDescription.add(jrss.getString(TAG_DESCRIPTION));
arrayDate.add(jrss.getString(TAG_DATE));
Log.d("LLLLLOOOOGGGG", jrss.getString("author")+"\n");
}}
else{
AlertDialog.Builder alertNetworkError = new AlertDialog.Builder(this);
alertNetworkError.setMessage("нет подключения к интернету");
alertNetworkError.setNegativeButton("Выйти", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
finish();
}
});
alertNetworkError.create();
alertNetworkError.show();
}
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}
arraymThumbs = new String[arrayThumbs.size()];
arraymThumbs = arrayThumbs.toArray(arraymThumbs);
arrayBimages = new String[arrayBig_image.size()];
arrayBimages = arrayBig_image.toArray(arrayBimages);
arrayauthor = new String[arrayAuthor.size()];
arrayauthor = arrayAuthor.toArray(arrayauthor);
arraydescription = new String[arrayDescription.size()];
arraydescription = arrayDescription.toArray(arraydescription);
arraydate = new String[arrayDate.size()];
arraydate = arrayDate.toArray(arraydate);
adapter = new ImageAdapter(MainActivity.this, arraymThumbs);
adapter.notifyDataSetChanged();
}
我的图像适配器在这里我从asyncTask得到所有结果并将拇指图像打印到我的GridView
public class ImageAdapter extends BaseAdapter {
public Context mContext;
String[] mThumbs;
public LayoutInflater inflater;
public DisplayImageOptions options;
public ImageLoader imageLoader;
public ImageAdapter (Context c, String[] arrayhumbss){
mContext = c;
inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mThumbs = arrayhumbss;
options = new DisplayImageOptions.Builder()
.showStubImage(R.drawable.ic_contact_picture_2)
.showImageForEmptyUri(R.drawable.ic_launcher)
.cacheInMemory()
.cacheOnDisc()
.bitmapConfig(Bitmap.Config.RGB_565)
.build();
imageLoader = ImageLoader.getInstance();
imageLoader.init(ImageLoaderConfiguration.createDefault(c));
}
@Override
public int getCount() {
return mThumbs.length;
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
final ImageView imageView;
if (convertView == null) {
imageView = (ImageView) inflater.inflate(R.layout.grid_item, parent, false);
} else {
imageView = (ImageView) convertView;
}
imageLoader.displayImage(mThumbs[position], imageView, options);
return imageView;
}
}
这是我的BACKTASK
public class BackTask extends AsyncTask<String, Void, JSONObject>{
@Override
protected JSONObject doInBackground(String... params) {
InputStream ips = null;
JSONObject jsonObj = null;
String json = "";
try {
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpResponse response = httpClient.execute(new HttpPost("http://192.168.1.179/lenta/image.js"));
ips = response.getEntity().getContent();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader bufff = new BufferedReader(new InputStreamReader(ips, "UTF-8"));
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = bufff.readLine()) != null){
sb.append(line + "\n");
}
ips.close();
json = sb.toString();
} catch (Exception e) {
e.printStackTrace();
}
try {
jsonObj = new JSONObject(json);
} catch (JSONException e) {
e.printStackTrace();
}
return jsonObj;
}
@Override
protected void onPostExecute(JSONObject result){
super.onPostExecute(result);
}
}
这里我从url处理我的json，在MainActivity中我得到这个表单task.get（）
答案 0 :(得分：2)
在此行后面添加grid.setAdapter(adapter)
adapter = new ImageAdapter(MainActivity.this, arraymThumbs);
希望这可以解决您的问题。
编辑：P.S。看来你需要阅读一些内容，因为我认为你并不完全了解适配器是什么以及如何使用它。
答案 1 :(得分：0)
使用此：
adapter = new ImageAdapter(YourActivity.this, arraymThumbs);
myGridView.setAdapter(adapter);
希望这会对你有所帮助。
感谢。