当用户单击按钮时，我的主要活动会调用 AsyncTask。此 AsyncTask 执行相当长的操作，包括一个进度对话框。其中一些操作涉及将 TableRow 视图添加到我的主要活动中的现有表中。
但是，我的问题是操作完成后，这些行没有显示在活动 GUI 中。我知道它们正在正确创建，因为如果我在手机上按“菜单”退出我的应用程序，然后再次打开应用程序，TableRow 视图会相应地填充到它们各自的位置。一切看起来都很完美...... UI 线程没有重新加载。
因此，我显然错过了在 AsyncTask 完成其职责后调用的某种函数。有谁知道这个刷新功能可能是什么？
谢谢你。
这是代码：
public void buttonClick(View view) {
if (view.getId() == R.id.button_begin) {
cr = this.getContentResolver();
dialog = new ProgressDialog(this);
dialog.setCancelable(false);
dialog.setMessage("Checking...");
dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
// reset the bar to the default value of 0
dialog.setProgress(0);
// display the progress bar
dialog.show();
new mainAsyncTask().execute();
}
}
@Override
protected void onPreExecute() {
try {
//create row span so description can overlap columns in the rows
span = new TableRow.LayoutParams();
span.span = 3;
// set the maximum value
dialog.setMax(numberOfItems.length);
//initialize facebook
fb = new FacebookInfo(context, mainActivity, settings, numberOfItems.length, isPaid, settings.getBoolean("checkBoxShareShort", false));
description = new String[numberOfItems.length];
factor = new String[numberOfItems.length];
cool = new String[numberOfItems.length];
cannot = new String[numberOfItems.length];
name = new String[numberOfItems.length];
ivFacebookPub = new ImageView[numberOfItems.length];
ivShare = new ImageView[numberOfItems.length];
tableGrid = new TableLayout[numberOfItems.length];
super.onPreExecute();
}
catch (Exception ex) {
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
ex.printStackTrace(pw);
table.addView(rowError);
rowError.addView(tvError, 0, span);
}
}
@Override
protected Void doInBackground(Void... params) {
for (int i = 0; i < numberOfItems.length; i++){
try {
if (Numbers[i] != null) {
if (flag == true) {
flag = false;
}
else if (flag == false) {
flag = true;
}
fb.addDescription(i, justStuff2[1]);
fb.addCannot(i, justStuff2[0]);
description[i] = justStuff2[1];
cannot[i] = justStuff2[0];
//initialize table
tableGrid[i] = TableVisuals.createTable(context, flag, i, clickViewContact);
//initialize rows
TableRow rowNamePhoto2 = new TableRow(context);
TableRow rowCannot2 = new TableRow(context);
TableRow rowStuff = new TableRow(context);
TableRow rowStuff2 = new TableRow(context);
TableRow rowInfo2 = new TableRow(context);
TableRow rowShare2 = new TableRow(context);
//create rows
rowNamePhoto2 = TableVisuals.createRow(context, flag);
rowCannot2 = TableVisuals.createRow(context, flag);
rowStuff = TableVisuals.createRow(context, flag);
//initialize views
TextView tvName2 = new TextView(context);
ImageView ivPhoto2 = new ImageView(context);
ImageView ivArrow2 = new ImageView(context);
TextView tvCannot2 = new TextView(context);
TextView tvDescription = new TextView(context);
//add data to views
tvName2 = TableVisuals.getName(context, cr, Numbers[i]);
ivPhoto2 = TableVisuals.getPhoto(context, cr, Numbers[i]);
ivArrow2 = TableVisuals.getArrowIcon(context, cr, Numbers[i]);
tvCannot2 = TableVisuals.getCannot(context, justStuff2[0]);
tvDescription = TableVisuals.getStuff(context, justStuff2[1]);
//add views to row
rowNamePhoto2.addView(ivPhoto2, 0);
rowNamePhoto2.addView(tvName2, 1);
rowNamePhoto2.addView(ivArrow2, 2);
rowCannot2.addView(tvCannot2, 0, span);
rowStuff.addView(tvDescription, 0, span);
//populate data
fb.addName(i, (String)tvName2.getText());
name[i] = (String)tvName2.getText();
if (isPaid == true) {
//create rows
rowStuff2 = TableVisuals.createRow(context, flag);
rowInfo2 = TableVisuals.createRow(context, flag);
//initialize views
TextView tvRatio2 = new TextView(context);
TextView tvVariance2 = new TextView(context);
//add data to views
tvRatio2 = TableVisuals.getRatio(context, justStuff2[3]);
tvVariance2 = TableVisuals.getVariance(context, justStuff2[2]);
//add views to row
rowStuff2.addView(tvRatio2, 0, span);
rowInfo2.addView(tvVariance2, 0, span);
//populate data
fb.addCool(i, (String)tvRatio2.getText());
fb.addFactor(i, (String)tvVariance2.getText());
cool[i] = (String)tvRatio2.getText();
factor[i] = (String)tvVariance2.getText();
}
if (settings.getBoolean("checkBoxSharing", true) == true) {
rowShare2 = TableVisuals.createRow(context, flag);
ivFacebookPub[i] = TableVisuals.createFacebookPublish(context, i, fb.clickFacebookPublish);
//add facebookPublish button
rowShare2.addView(ivFacebookPub[i], 0);
//add share button
ivShare[i] = TableVisuals.createShare(context, i, fb.clickShareResults);
rowShare2.addView(ivShare[i], 1);
}
//add rows to table
tableGrid[i].addView(rowNamePhoto2);
tableGrid[i].addView(rowCannot2);
if (isPaid) {
tableGrid[i].addView(rowStuff2);
tableGrid[i].addView(rowInfo2);
}
tableGrid[i].addView(rowStuff);
if (settings.getBoolean("checkBoxSharing", true) == true) {
tableGrid[i].addView(rowShare2);
}
//add table to the main table
table.addView(tableGrid[i]);
//initialize line
TableRow rowLine2 = new TableRow(context);
rowLine2 = TableVisuals.createLineRow(context);
TextView tvLine2 = new TextView(context);
tvLine2 = TableVisuals.createRowLine(context);
//add line view
rowLine2.addView(tvLine2, 0, span);
table.addView(rowLine2);
}
publishProgress(i,0);
}
catch (Exception ex) {
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
ex.printStackTrace(pw);
publishProgress(i, 1);
}
}
return null;
}
@Override
protected void onProgressUpdate(Integer... value) {
dialog.setProgress(value[0]);
}
@Override
protected void onPostExecute(Void unused) {
//close progress bar dialog
dialog.dismiss();
//here is where I try the invalidate and postInvalidate
table.invalidate();
for (int i = 0; i < numberOfItems.length; i++) {
tableGrid[i].invalidate();
}