我有一个连接数据库并检索注释的json函数。该函数首先收集有多少注释，然后while循环调用该函数，直到检索到所有注释。问题是当我加载我的应用程序是黑屏并且没有加载其余视图，直到Json功能完成。我希望json函数在后台运行。因此应用程序将加载，评论将在后台单独加载。以下是收集所有评论的代码，
String usernameforcomments = db.getUserDetails();
registerErrorMsg = (TextView) findViewById(R.id.collectComment_error);
int verify = 1;
int verify2 = 1;
String offsetNumber = "null";
LinearLayout linear = (LinearLayout) this.findViewById(R.id.commentSection);
UserFunctions CollectComments = new UserFunctions();
JSONObject json = CollectComments.collectComments(usernameforcomments, offsetNumber);
int commentCycle = 1;
// check for comments
try {
if (json.getString(KEY_SUCCESS) != null) {
registerErrorMsg.setText("");
String res2 = json.getString(KEY_SUCCESS);
if(Integer.parseInt(res2) == 1){
String numberOfComments = json.getString(KEY_NUMBER_OF_COMMENTS);
String offsetNumberDb = db.getOffsetNumber();
int numberOfComments2 = Integer.parseInt(numberOfComments) - Integer.parseInt(offsetNumberDb);
offsetNumber = offsetNumberDb;
//if comment number is less than 15 or equal to 15
if(numberOfComments2 <= 15){
while (commentCycle <= numberOfComments2){
JSONObject json2 = CollectComments.collectComments(usernameforcomments, offsetNumber);
LinearLayout commentBox = new LinearLayout(this);
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
commentBox.setBackgroundResource(R.drawable.comment_box_bg);
layoutParams.setMargins(0, 10, 0, 10);
commentBox.setPadding(0,0,0,10);
commentBox.setOrientation(LinearLayout.VERTICAL);
linear.addView(commentBox, layoutParams);
RelativeLayout commentBoxHeader = new RelativeLayout(this);
commentBoxHeader.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
commentBoxHeader.setBackgroundResource(R.drawable.comment_box_bg);
commentBoxHeader.setBackgroundResource(R.drawable.comment_box_header);
commentBox.addView(commentBoxHeader);
TextView usernameView = new TextView(this);
usernameView.setText("Posted by: " + json2.getString(KEY_USERNAME));
RelativeLayout.LayoutParams usernameViewParam = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
usernameViewParam.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
usernameView.setTextColor(getResources().getColor(R.color.white));
usernameView.setPadding(5, 5, 10, 5);
usernameView.setTypeface(Typeface.DEFAULT_BOLD);
commentBoxHeader.addView(usernameView, usernameViewParam);
TextView commentView = new TextView(this);
commentView.setText(json2.getString(KEY_COMMENT));
LinearLayout.LayoutParams commentViewParams = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
commentViewParams.setMargins(20, 10, 20, 20);
commentView.setBackgroundResource(R.drawable.comment_bg);
commentView.setTextColor(getResources().getColor(R.color.black));
commentBox.addView(commentView, commentViewParams);
TextView descriptionView = new TextView(this);
descriptionView.setText(json2.getString(KEY_COMMENT));
descriptionView.setPadding(20, 10, 20, 20);
descriptionView.setLayoutParams(new LinearLayout.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
descriptionView.setTextColor(getResources().getColor(R.color.black));
commentBox.addView(descriptionView);
RelativeLayout commentBoxButtons = new RelativeLayout(this);
RelativeLayout.LayoutParams commentBoxButtonsParam = new RelativeLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT);
commentBox.addView(commentBoxButtons, commentBoxButtonsParam);
Button btnTag1 = new Button(this);
RelativeLayout.LayoutParams btnTag1Param = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
btnTag1Param.addRule(RelativeLayout.ALIGN_PARENT_LEFT);
btnTag1.setText("Go to " + json2.getString(KEY_PLATENUMBER));
btnTag1Param.setMargins(10, 10, 10, 10);
btnTag1.setBackgroundResource(R.drawable.dashboard_post);
btnTag1.setTextColor(getResources().getColor(R.color.white));
btnTag1.setTypeface(Typeface.DEFAULT_BOLD);
btnTag1.setPadding(8, 5, 8, 5);
btnTag1.setId(verify);
commentBoxButtons.addView(btnTag1, btnTag1Param);
Button btnTag2 = new Button(this);
RelativeLayout.LayoutParams btnTag2Param = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
btnTag2Param.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
btnTag2.setText("Go to " + json2.getString(KEY_USERNAME));
btnTag2Param.setMargins(10, 10, 10, 10);
btnTag2.setTypeface(Typeface.DEFAULT_BOLD);
btnTag2.setBackgroundResource(R.drawable.dashboard_post);
btnTag2.setTextColor(getResources().getColor(R.color.white));
btnTag2.setPadding(8, 5, 8, 5);
btnTag2.setId(verify2);
commentBoxButtons.addView(btnTag2, btnTag2Param);
verify2 = verify2 + 1;
verify = verify + 1;
offsetNumber = json2.getString(KEY_OFFSET_NUMBER);
commentCycle = commentCycle + 1;
}//end while
}//end if comment number is less than or equal to 15
}//end if key is == 1
else{
// Error in registration
registerErrorMsg.setText(json.getString(KEY_ERROR_MSG));
}//end else
}//end if
} //end try
catch (JSONException e) {
e.printStackTrace();
}//end catch
如何将此代码放在asynctask中，以便它在后台运行。
答案 0 :(得分：0)
我不打算为你重新编写代码，但你可以尝试一下，然后发布你遇到麻烦的地方。您可以使用UI以外的任何方法更新doInBackground()元素。因此，设置AyncTask（this SO answer of mine shows the basic structure），如果您需要对UI执行某些操作，例如在任务开始之前显示ProgressBar，那么您可以将其放入{ {1}}
将所有JSON转换放在onPreExecute()中，如果您需要在获取数据时更新doInBackground()，则可以使用UI中的publishProgress()来doInBackground() 1}}。
如果您需要来自onProgressUpdate()的{{1}}数据，那么它会return将其作为doInBackground()的参数，然后您可以再次更新return， onPostExecute()方法等......