我正在使用json从服务器请求中解码jpeg图像。我用自定义ListView适配器和一些文本显示它们。
图像可以正确显示ListView中的前8个ImageView，但之后，它将不再显示图像（它将显示文本）。例如，如果我总共有10个图像，则最后两个图像将不会显示在ListView中，但如果我删除前两个图像，则最后两个图像将显示，因此不必担心检索实际图像。 / p>
在我的主要活动（NotesActivity）上，我有一个按钮转到另一个执行asyntask的活动，在onPostExecute中的异步任务中，它返回到主活动，它应该显示更新的列表（并且它是的，除非有超过8张图片）。
我不知道从哪里开始，有什么建议吗？
我的包含ListView的活动
public class NotesActivity extends Activity implements OnClickListener {
String key = "NOTES";
String key2 = "UPDATE_NOTES";
Gson gson = new Gson();
// Notes myNotes = new Notes();
NotesList myNotes = new NotesList();
String bId;
String res = null;
EditText notes;
Button save;
private Button createNote;
private int position;
private String type;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.notes_layout);
createNote = (Button) findViewById(R.id.notes_layout_btn_createNote);
Bundle bundle = this.getIntent().getExtras();
position = bundle.getInt("position");
type = bundle.getString("type");
//
if (type.equals("LISTINGS")) {
Listings it = ListingsFragment.myListings.getListings().get(
position);
bId = it.getBID();
notes = (EditText) findViewById(R.id.notes);
}
//
if (type.equals("SHARED")) {
Listings it = SharedFragment.myShared.getListings().get(position);
bId = it.getBID();
notes = (EditText) findViewById(R.id.notes);
}
GetNotes getNotes = new GetNotes();
try {
NotesList copy = new NotesList();
getNotes.execute(key, bId).get();
for (int j = 0; j < myNotes.getNotes().size(); j++) {
Notes note = myNotes.getNotes().get(j);
System.out.println("Removed value: " + note.getIsRemoved());
if (note.getIsRemoved() == null) {
copy.getNotes().add(note);
}
}
NotesAdapter adapter = new NotesAdapter(this, R.layout.note_row,
copy.getNotes());
ListView lv = (ListView) findViewById(R.id.notes_layout_lv_notesList);
lv.setAdapter(adapter);
} catch (Exception e) {
}
createNote.setOnClickListener(this);
}
private class GetNotes extends AsyncTask<String, String, NotesList> {
@Override
protected NotesList doInBackground(String... things) {
ArrayList<NameValuePair> postParameters = new ArrayList<NameValuePair>();
postParameters.add(new BasicNameValuePair("key", things[0]));
postParameters.add(new BasicNameValuePair("bId", things[1]));
// String valid = "1";
String response = null;
try {
response = CustomHttpClient.executeHttpPost(
"http://propclip.dev/mobile.php", postParameters);
res = response.toString();
// System.out.println("This is the response " + res);
// res = res.trim();
// res= res.replaceAll("\\s+","");
// error.setText(res);
// System.out.println(res);
myNotes = gson.fromJson(res, NotesList.class);
// System.out.println(res);
} catch (Exception e) {
res = e.toString();
}
return myNotes;
}
@Override
protected void onPostExecute(NotesList res) {
}
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.notes_layout_btn_createNote:
ProfileDataSource datasource = new ProfileDataSource(this);
datasource.open();
PropClipGlobal pcg = datasource.getUserIdenity();
Intent intent = new Intent(this, NewNoteActivity.class);
intent.putExtra("bId", bId);
intent.putExtra("uId", pcg.getUID());
intent.putExtra("username", pcg.getEm());
intent.putExtra("position", position);
intent.putExtra("type", type);
startActivity(intent);
}
}
}
我的自定义适配器
public class NotesAdapter extends ArrayAdapter<Notes> {
List<Notes> notes;
Context context;
public NotesAdapter(Context context, int resource, List<Notes> notes) {
super(context, resource, notes);
this.notes = notes;
this.context = context;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
if (v == null) {
LayoutInflater vi;
vi = LayoutInflater.from(getContext());
v = vi.inflate(R.layout.note_row, null);
}
Notes note = notes.get(position);
ImageView icon = (ImageView) v.findViewById(R.id.note_row_icon);
TextView name = (TextView) v.findViewById(R.id.note_row_name);
TextView message = (TextView) v.findViewById(R.id.note_row_message);
TextView date = (TextView) v.findViewById(R.id.note_row_date);
String input = note.getNoteDate();
SimpleDateFormat inputDf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
SimpleDateFormat outputDf = new SimpleDateFormat("dd, yyyy");
SimpleDateFormat monthFormat = new SimpleDateFormat("MM");
Date myDate = null;
try {
myDate = inputDf.parse(input);
} catch (ParseException e) {
e.printStackTrace();
}
String month = monthFormat.format(myDate);
date.setText(getMonth(Integer.parseInt(month)) + " "
+ outputDf.format(myDate));
message.setText(note.getNote());
name.setText(note.getFirstName() + " " + note.getLastName());
// System.out.println(p.getFileData());
byte[] imageAsBytes = Base64.decode(note.getFileData().getBytes(),
position);
icon.setImageBitmap(BitmapFactory.decodeByteArray(imageAsBytes, 0,
imageAsBytes.length));
System.out.println(note.getFileData());
return v;
}
public String getMonth(int month) {
return new DateFormatSymbols().getMonths()[month - 1];
}
}
最终进入主要活动的活动（NotesActivity）
public class NewNoteActivity extends Activity implements OnClickListener {
private String uId;
private String bId;
private String username;
private String response;
private String key = "UPDATE_NOTES";
private Button submit;
private EditText note;
private int position;
private String type;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_new_note);
submit = (Button) findViewById(R.id.activity_new_note_btn_submit);
note = (EditText) findViewById(R.id.activity_new_note_et_note);
Intent intent = getIntent();
bId = intent.getStringExtra("bId");
uId = intent.getStringExtra("uId");
username = intent.getStringExtra("username");
position = intent.getIntExtra("position", 0);
type = intent.getStringExtra("type");
submit.setOnClickListener(this);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.new_note, menu);
return true;
}
private class UpdateNotes extends AsyncTask<String, String, String> {
@Override
protected String doInBackground(String... values) {
ArrayList<NameValuePair> postParameters = new ArrayList<NameValuePair>();
postParameters.add(new BasicNameValuePair("key", values[0]));
postParameters.add(new BasicNameValuePair("bId", values[1]));
postParameters.add(new BasicNameValuePair("uId", values[2]));
postParameters.add(new BasicNameValuePair("username", values[3]));
postParameters.add(new BasicNameValuePair("note", values[4]));
String response = null;
try {
response = CustomHttpClient.executeHttpPost(
"http://propclip.dev/mobile.php", postParameters);
response = response.toString();
} catch (Exception e) {
response = e.toString();
}
return null;
}
@Override
protected void onPostExecute(String response) {
Intent intent = new Intent(getApplicationContext(),
NotesActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intent.putExtra("position", position);
intent.putExtra("type", type);
startActivity(intent);
Toast toast = Toast.makeText(getApplicationContext(),"Added note!", Toast.LENGTH_LONG);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();
}
}
@Override
public void onClick(View v) {
String noteMessage = note.getText().toString();
UpdateNotes updateNotes = new UpdateNotes();
updateNotes.execute(key, bId, uId, username, noteMessage);
}
}