在我的活动中，我正在使用 AsyncTask 设置所有视图，如 ImageView、TextViews 及其各自的数据。
后asyncTask.Execute();
我有一个textView.onCLickListener调用相机，在拍照后，活动中的 ImageView 设置为此图片。
但问题是在 onActivityResult(); 之后再次调用了我的 asyncTask；
这是我完整的活动代码：
public class UserProfileActivity extends Activity {
//many instance fiels here
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.user_profile);
new LongOperation().execute("");
userImage = (ImageView) findViewById(R.id.profileImage);
userName = (TextView) findViewById(R.id.userName_profile);
userLocation = (TextView) findViewById(R.id.userLocation_profile);
editInfo = (TextView) findViewById(R.id.edit_profile);
changeImage = (TextView) findViewById(R.id.changeImage_profile);
userScore = (TextView) findViewById(R.id.userScore_profile);
friendsLabel = (TextView) findViewById(R.id.userFriends_profile);
changeImage.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
Intent cameraIntent = new Intent(
android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, CAMERA_REQUEST);
//Point 1
}
});
//Point 2
}
private class LongOperation extends AsyncTask<String, Void, String> {
private InputStream is;
private StringBuilder sb;
private String result;
private ProgressDialog dialog = new ProgressDialog(context);
@Override
protected String doInBackground(String... params) {
//Point 3
try {
HttpResponse response;
HttpPost httppost = new HttpPost(
"http://www.xxxxx.com/yyyy/zzzz");
//httpclient is global to maintain sessions
response = SignUpActivity.httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
try {
BufferedReader reader = new BufferedReader(
new InputStreamReader(is, "iso-8859-1"), 8);
sb = new StringBuilder();
sb.append(reader.readLine() + "\n");
String line = "0";
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result = sb.toString();
} catch (Exception e) {
Log.e("error in reading input stream", e.toString());
}
try {
JSONObject jObj = new JSONObject(result);
String status = jObj.getString("status");
score = jObj.getInt("credits");
level = jObj.getInt("level");
image = jObj.getString("image");
fname = jObj.getString("fname");
lname = jObj.getString("lname");
city = jObj.getString("city");
email = jObj.getString("email");
clickedUserId = jObj.getInt("user_id");
JSONArray friendsJsonArray = jObj.getJSONArray("friends");
size = friendsJsonArray.length();
ArrayList<String> friendsNames = new ArrayList<String>();
friendsIds = new int[size];
for (int i = 0; i < size; i++) {
friendsNames.add(friendsJsonArray.getJSONObject(i)
.getString("name"));
friendsIds[i] = friendsJsonArray.getJSONObject(i)
.getInt("user_id");
}
adapter = new ArrayAdapter<String>(context,
R.layout.simple_listview_item, friendsNames);
} catch (Exception e) {
Log.d("error in creating json object", e.toString());
}
} catch (Exception e) {
//Point 5
Log.e("error main try", "Error in http connection" + e.toString());
}
return "Executed";
}
@Override
protected void onPostExecute(String result) {
friendsList.setAdapter(adapter);
userScore.setText(score + " points" + " level " + level);
userName.setText(fname + " " + lname);
userLocation.setText(city);
changeImage.setText("Change image");
editInfo.setText("Edit");
friendsLabel.setText("Friends");
Bitmap bitmap = null;
try {
bitmap = BitmapFactory
.decodeStream((InputStream) new URL(image).getContent());
userImage.setImageBitmap(bitmap);
} catch (MalformedURLException e1) {
e1.printStackTrace();
userImage.setImageResource(R.drawable.xxx);
} catch (IOException e2) {
e2.printStackTrace();
userImage.setImageResource(R.drawable.xxx);
}
if (dialog.isShowing()) {
dialog.dismiss();
}
}
@Override
protected void onPreExecute() {
this.dialog.setMessage("Please wait");
this.dialog.show();
}
@Override
protected void onProgressUpdate(Void... values) {
}
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
//Point 4
if (resultCode == RESULT_OK) {
if (data != null) {
photo = (Bitmap) data.getExtras().get("data");
userImage.setImageBitmap(photo);
}else{
Intent intent = new Intent(UserProfileActivity.this,
UserProfileActivity.class);
startActivity(intent);
}
} else {
Intent intent = new Intent(UserProfileActivity.this,
UserProfileActivity.class);
startActivity(intent);
}
}
}