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POAndroid onLayout() and AsyncTask() does not work together
 

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  1. POAndroid onLayout() and AsyncTask() does not work together
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    <p>I need a scrollable table with fixed header, so I followed <a href="http://blog.stylingandroid.com/archives/432" rel="nofollow noreferrer">this great blog</a> and everything is fine. </p> <p>The idea is using one table for header, one table for content added in scrollview, both of them are in a customized LinearLayout. In customized LinearLayout, we will overwrite the onLayout() to get the max width of each row and set width for each row of both header and content table. </p> <p>Here is the activity and its layout: </p> <pre><code>package com.stylingandroid.ScrollingTable; import android.content.Context; import android.util.AttributeSet; import android.view.View; import android.widget.LinearLayout; import android.widget.TableLayout; import android.widget.TableRow; public class ScrollingTable extends LinearLayout { public ScrollingTable( Context context ) { super( context ); } public ScrollingTable( Context context, AttributeSet attrs ) { super( context, attrs ); } @Override protected void onLayout( boolean changed, int l, int t, int r, int b ) { super.onLayout( changed, l, t, r, b ); TableLayout header = (TableLayout) findViewById( R.id.HeaderTable ); TableLayout body = (TableLayout) findViewById( R.id.BodyTable ); if (body.getChildCount() &gt; 0 ) { TableRow bodyRow = (TableRow) body.getChildAt(0); TableRow headerRow = (TableRow) header.getChildAt(0); for ( int cellnum = 0; cellnum &lt; bodyRow.getChildCount(); cellnum++ ){ View bodyCell = bodyRow.getChildAt(cellnum); View headerCell = headerRow.getChildAt(cellnum); int bodyWidth = bodyCell.getWidth(); int headerWidth = headerCell.getWidth(); int max = Math.max(bodyWidth, headerWidth); TableRow.LayoutParams bodyParams = (TableRow.LayoutParams)bodyCell.getLayoutParams(); bodyParams.width = max; TableRow.LayoutParams headerParams = (TableRow.LayoutParams)headerCell.getLayoutParams(); headerParams.width = max; } } } } </code></pre> <p>main.xml </p> <pre><code> &lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"&gt; &lt;com.stylingandroid.ScrollingTable.ScrollingTable android:layout_width="match_parent" android:orientation="vertical" android:layout_height="match_parent"&gt; &lt;TableLayout android:layout_height="wrap_content" android:layout_width="match_parent" android:id="@+id/HeaderTable"&gt; &lt;/TableLayout&gt; &lt;ScrollView android:layout_width="match_parent" android:layout_height="wrap_content"&gt; &lt;TableLayout android:layout_height="wrap_content" android:layout_width="match_parent" android:id="@+id/BodyTable"&gt; &lt;/TableLayout&gt; &lt;/ScrollView&gt; &lt;/com.stylingandroid.ScrollingTable.ScrollingTable&gt; &lt;/LinearLayout&gt; </code></pre> <p>Main activity </p> <pre><code> package com.stylingandroid.ScrollingTable; import android.app.Activity; import android.app.ProgressDialog; import android.graphics.Color; import android.os.AsyncTask; import android.os.Bundle; import android.widget.TableLayout; import android.widget.TableRow; import android.widget.TextView; public class ScrollingTableActivity extends Activity { private String[][] tableData = { {"header11111111111", "header2","header3","header4"}, {"column1", "column1","column1","column1"}, {"column1", "column1","column1","column1"}, {"column1", "column1","column1","column1"}, {"column1", "column1", "column1","column1"}, {"column1", "column1","column1","column1"}, {"column1", "column1","column1","column1"}, {"column1", "column1","column1","column1"}, {"column1", "column1","column1","column1"}, {"column1", "column1","column1","column1"}, {"column1", "column1","column1","column1"}, {"column1", "column1","column1","column1"}, {"column1", "column1","column1","column1"} }; /** Called when the activity is first created. */ @Override public void onCreate( Bundle savedInstanceState ) { super.onCreate( savedInstanceState ); setContentView( R.layout.main ); TableLayout tableHeader = (TableLayout)findViewById(R.id.HeaderTable); TableLayout tableBody = (TableLayout)findViewById(R.id.BodyTable); appendRows(tableHeader, tableBody, tableData); } private void appendRows(TableLayout tableHeader ,TableLayout tableContent, String[][] amortization) { int rowSize=amortization.length; int colSize=(amortization.length &gt; 0)?amortization[0].length:0; for(int i=0; i&lt;rowSize; i++) { TableRow row1 = new TableRow(this); for(int j=0; j&lt;colSize; j++) { TextView c = new TextView(this); c.setText(amortization[i][j]); c.setPadding(3, 3, 3, 3); if (i == 0) { c.setTextColor(Color.BLACK); } row1.addView(c); } if (i == 0) { row1.setBackgroundColor(Color.LTGRAY); tableHeader.addView(row1, new TableLayout.LayoutParams()); } else { tableContent.addView(row1, new TableLayout.LayoutParams()); } } } </code></pre> <p>The above code work perfectly (<img src="https://i.stack.imgur.com/X9Gzv.png" alt="expected">), however, when I use AnysnTask to get data from server and add data to table later, the onLayout() in my custom view doesn't work anymore. I simulate getting data by log out some number: </p> <pre><code>public void onCreate( Bundle savedInstanceState ) { super.onCreate( savedInstanceState ); setContentView( R.layout.main ); new MyTask().execute(); } private class MyTask extends AsyncTask&lt;Void, Void, Void&gt; { private ProgressDialog progressDialog; protected void onPreExecute() { progressDialog = ProgressDialog.show(ScrollingTableActivity.this, "", "Loading. Please wait...", true); } @Override protected Void doInBackground(Void... reportTypes) { for (int i = 0; i &lt; 500; i++) { System.out.println(i); } return null; } @Override protected void onPostExecute(Void result) { progressDialog.dismiss(); TableLayout tableHeader = (TableLayout)findViewById(R.id.HeaderTable); TableLayout tableBody = (TableLayout)findViewById(R.id.BodyTable); appendRows(tableHeader, tableBody, tableData); } } </code></pre> <p>So the onLayout() only work when I call appendRows() from main UI thread by putting it in onCreate() method. If I call from another UI thread (in onPostExecute() of AsyncTask), the onLayout() is called (I checked it by create some logs) but it doesn't effect to the GUI. I tried with invalidate(), forceLayout(), requestLayout() but doesn't change anything.<img src="https://i.stack.imgur.com/Jwp8q.png" alt="wrong"> </p> <p>I think we need to call a method to make the GUI refresh but don't know what it is, I have searched and tried a lot of ways in 2 days but got nothing, so it will be very appreciated if you can give any idea about this. Many thanks. </p>
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    1. COThere is no "another" UI thread. The `onPostExecute` is called on the same thread as `onCreate`.
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    2. COIf so, why it just works when I put the appendRow in the onCreate.
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    3. COI don't know. I haven't looked at your code in-depth. But you might want to think about the issue without taking threads into account.
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      1. POAndroid onLayout() and AsyncTask() does not work together
      1. USinazaruk
 

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