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POAndroid ProgressDialog Progress Bar doing things in the right order
 

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  1. POAndroid ProgressDialog Progress Bar doing things in the right order
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    <p>I just about got this, but I have a small problem in the order of things going off. Specifically, in my thread() I am setting up an array that is used by a Spinner. Problem is the Spinner is all set and done basically before my thread() is finished, so it sets itself up with a null array.</p> <p>How do I associate the spinners ArrayAdapter with an array that is being loaded by another thread?</p> <p>I've cut the code down to what I think is necessary to understand the problem, but just let me know if more is needed. The problem occurs whether or not refreshData() is called.</p> <p>Along the same lines, sometimes I want to call loadData() from the menu. Directly following loadData() if I try to fire a toast on the next line this causes a forceclose, which is also because of how I'm implementing ProgressDialog.</p> <p>THANK YOU FOR LOOKING</p> <pre><code>public class CMSHome extends Activity { private static List&lt;String&gt; pmList = new ArrayList&lt;String&gt;(); // Instantiate helpers PMListHelper plh = new PMListHelper(); ProjectObjectHelper poc = new ProjectObjectHelper(); // These objects hold lists and methods for dealing with them private Employees employees; private Projects projects; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); // Loads data from filesystem, or webservice if necessary loadData(); // Capture spinner and associate pmList with it through ArrayAdapter spinner = (Spinner) findViewById(R.id.spinner); ArrayAdapter&lt;String&gt; adapter = new ArrayAdapter&lt;String&gt;( this, android.R.layout.simple_spinner_item, pmList); adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); spinner.setAdapter(adapter); //---the button is wired to an event handler--- Button btn1 = (Button)findViewById(R.id.btnGetProjects); btn1.setOnClickListener(btnListAllProjectsListener); spinner.setOnItemSelectedListener(new MyOnItemSelectedListener()); } private void loadData() { final ProgressDialog pd = ProgressDialog.show(this, "Please wait", "Loading Data...", true, false); new Thread(new Runnable(){ public void run(){ employees = plh.deserializeEmployeeData(); projects = poc.deserializeProjectData(); // Check to see if data actually loaded, if not then refresh if ((employees == null) || (projects == null)) { refreshData(); } // Load up pmList for spinner control pmList = employees.getPMList(); pd.dismiss(); } }).start(); } private void refreshData() { // Refresh data for Projects projects = poc.refreshData(); poc.saveProjectData(mCtx, projects); // Refresh data for PMList employees = plh.refreshData(); plh.savePMData(mCtx, employees); } } </code></pre> <p>&lt;---- EDIT -----> I tried changing onCreate() to the following after Jims suggestion. Not sure if I did this right, still doesn't work:</p> <pre><code>@Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mCtx = this; // Loads data from filesystem, or webservice if necessary // Would like to extend this to update if files are over x days old final ProgressDialog pd = ProgressDialog.show(this, "Please wait", "Loading Data...", true, false); new Thread(new Runnable(){ public void run(){ employees = plh.deserializeEmployeeData(); projects = poc.deserializeProjectData(); // Check to see if data actually loaded, if not then refresh if ((employees == null) || (projects == null)) { refreshData(); } pd.dismiss(); runOnUiThread(new Runnable() { public void run(){ // Load up pmList for spinner control pmList = employees.getPMList(); } }); } }).start(); spinner = (Spinner) findViewById(R.id.spinner); ArrayAdapter&lt;String&gt; adapter = new ArrayAdapter&lt;String&gt;( this, android.R.layout.simple_spinner_item, pmList); adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); spinner.setAdapter(adapter); //---the button is wired to an event handler--- Button btn1 = (Button)findViewById(R.id.btnGetProjects); btn1.setOnClickListener(btnListAllProjectsListener); spinner.setOnItemSelectedListener(new MyOnItemSelectedListener()); } </code></pre> <hr> <p>Wow, this took forever for me to find a solution, but Im overjoyed to have finally gotten this to work.</p> <p>Updating the Spinner with a background thread can be accomplished by utilizing a handler. The handler is called after the main work of the thread is completed.</p> <pre><code> mProgressDlg = ProgressDialog.show(this, "App_Name", "Loading data...", true, false); new Thread(new Runnable(){ public void run() { /*Load Data, set pmList in my case*/ mProgressDlg.dismiss(); hRefresh.sendEmptyMessage(REFRESH); } }).start(); Handler hRefresh = new Handler(){ @Override public void handleMessage(Message msg) { switch(msg.what){ case REFRESH: spinner = (Spinner) findViewById(R.id.spinner); final ArrayAdapter&lt;String&gt; adapter = new ArrayAdapter&lt;String&gt;( mCtx, android.R.layout.simple_spinner_item, pmList); adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); spinner.setAdapter(adapter); spinner.setOnItemSelectedListener(new MyOnItemSelectedListener()); break; } } }; </code></pre> <p>Credit to bhatt4982 and his answer on <a href="https://stackoverflow.com/questions/1458190/how-can-i-display-a-progress-at-start-up-application-in-android">this thread</a></p>
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