我是构建Android应用程序的新手，有很多我不知道的事情。我一直在寻找几个小时，关于如何在我的TextViews programmaticaly中插入Speech Bubbles，我找不到任何可以帮助我的东西，因为我使用Json文件从我的数据库中获取数据，我正在使用Java打印所有数据。
我试图获取我的listview行布局，并在那里插入可绘制的图像，但它没有用。
我想找一个好的教程，解释如何在我的情况下这样做。
继承我的代码。
public class ChatRoomActivity extends ListActivity {
private ProgressDialog pDialog;
private ImageView img;
private TextView text;
// URL to get contacts JSON
private static String url = "http://192.168.1.67/example/chat_room.php";
// JSON Node names
private static final String TAG_CONTACTS = "contacts";
private static final String TAG_ID = "id";
private static final String TAG_NAME = "username";
private static final String TAG_MESSAGE = "reply";
private static final String TAG_IMAGE = "pic_url";
private static final String TAG_USERID = "user_id";
// contacts JSONArray
JSONArray contacts = null;
// Hashmap for ListView
ArrayList<HashMap<String, String>> contactList;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_chatlist);
Intent intent = getIntent();
String id = intent.getStringExtra("teste");
// Toolbar links
View myLayout = findViewById( R.id.include1 ); // root View id from that link
View myView = myLayout.findViewById( R.id.toolbar_title ); // id of a view contained in the included file
View myView2 = myLayout.findViewById( R.id.toolbar_title2 );
myView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
NewSession app = (NewSession) getApplication();
String username = app.getUsername();
Intent in = new Intent(getApplicationContext(),
UserProfile.class);
in.putExtra("teste", username);
startActivity(in);
}
});
contactList = new ArrayList<HashMap<String, String>>();
ListView lv = getListView();
// Listview on item click listener
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
}
});
// Calling async task to get json
new GetContacts().execute(id);
}
/**
* Async task class to get json by making HTTP call
* */
private class GetContacts extends AsyncTask<String, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(ChatRoomActivity.this);
pDialog.setMessage("Please wait...");
pDialog.setCancelable(false);
pDialog.show();
}
protected Void doInBackground(String... arg0) {
NewSession app = (NewSession) getApplication();
String username = app.getUsername();
String getinfo = (String)arg0[0];
// Creating service handler class instance
ServiceHandler sh = new ServiceHandler();
// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(url + "?id=" + username + "&id2=" + getinfo, ServiceHandler.GET);
Log.d("Response: ", "> " + jsonStr);
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
// Getting JSON Array node
contacts = jsonObj.getJSONArray(TAG_CONTACTS);
// looping through All Contacts
for (int i = 0; i < contacts.length(); i++) {
JSONObject c = contacts.getJSONObject(i);
String id = c.getString(TAG_ID);
String name = c.getString(TAG_NAME);
String userid = c.getString(TAG_USERID);
String message = c.getString(TAG_MESSAGE);
String pic_url_get = c.getString(TAG_IMAGE);
HashMap<String, String> contact = new HashMap<String, String>();
// adding each child node to HashMap key => value
contact.put(TAG_ID, id);
contact.put(TAG_MESSAGE, message);
contact.put(TAG_NAME, name + ", " + name);
contact.put(TAG_IMAGE, "http://www.*****.com/images/" + userid + "/" + pic_url_get);
// adding contact to contact list
contactList.add(contact);
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Log.e("ServiceHandler", "Couldn't get any data from the url");
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
/**
* Updating parsed JSON data into ListView
* */
costumeadapter adapter = new costumeadapter(
ChatRoomActivity.this,
contactList,
R.layout.chat_row,
new String[]{ TAG_MESSAGE },
new int[]{ R.id.name });
setListAdapter(adapter);
}
}
//Costume adapter
public class costumeadapter extends SimpleAdapter{
public costumeadapter(ChatRoomActivity chatRoomActivity,
ArrayList<HashMap<String, String>> contactList, int listItem,
String[] strings, int[] is) {
super(chatRoomActivity, contactList, listItem, strings, is);
// TODO Auto-generated constructor stub
}
//User's avatar
public View getView(int position, View convertView, ViewGroup parent){
// here you let SimpleAdapter built the view normally.
View v = super.getView(position, convertView, parent);
// Then we get reference for Picasso
if(img == null){
img = (ImageView) v.findViewById(R.id.list_image);
v.setTag(img); // <<< THIS LINE !!!!
}
// get the url from the data you passed to the `Map`
String url = (String) ((Map)getItem(position)).get(TAG_IMAGE);
// do Picasso
Picasso.with(v.getContext()).load(url).into(img);
//img.setTag(url);
// return the view
return v;
}
}
}