I understand the concept of threads, and it almost seems like I understand how to implement them. This code executes properly until I press the back button (to close), and then gives a "This application has stopped unexpectedly. Please try again." Well duh, I closed it!
Heres the code Im using: (It is a slightly modified version of the example provided here: http://www.helloandroid.com/node/243 using the modifications I found here: http://stackoverflow.com/questions/680180/where-to-stop-destroy-threads-in-android-service-class ) The import Pi class comes from this website, its just an arbitrary class that will perform a long calculation to show the example http://blog.taragana.com/index.php/archive/calculate-pi-to-arbitrary-precision-sample-java-code/ /*************************************************/ package com.example; import com.example.Pi; import android.app.Activity; import android.app.ProgressDialog; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.TextView; public class AndroidThreads extends Activity implements Runnable { private String pi_string; private TextView tv; private ProgressDialog pd; private volatile Thread runner; @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.main); mp = MediaPlayer.create(getBaseContext(), R.raw.camera_click); //this is using the slow.mp3 resource tv = (TextView) this.findViewById(R.id.box); tv.setText("Press submit to start calculation"); Button submit = (Button) findViewById(R.id.submit_btn); submit.setOnClickListener(new OnClickListener(){ public void onClick(View v){ startThread(); } }); } public synchronized void startThread(){ if(runner == null){ pd = ProgressDialog.show(this, "Working..", "Calculating Pi", true, false); runner = new Thread(this); runner.start(); } } public synchronized void stopThread(){ if(runner != null){ Thread moribund = runner; runner = null; moribund.interrupt(); } } public void run(){ pi_string = Pi.computePi(800).toString(); handler.sendEmptyMessage(0); } private Handler handler = new Handler() { @Override public void handleMessage(Message msg) { pd.dismiss(); tv.setText(pi_string); } }; } /*************************************************/ So like I said, this does everything I want it to do, except... it gives the crash error when I exit the program. *So what I need to know is why is it crashing, and how can I fix it?* It seems to me like the threads aren't all finishing properly, so I tried putting the stopThread() function into the onStop() and onDestroy () overrides, but that didn't seem to make a difference. Appreciate any input! -kevin --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Beginners" group. To post to this group, send email to android-beginners@googlegroups.com To unsubscribe from this group, send email to android-beginners-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-beginners?hl=en -~----------~----~----~----~------~----~------~--~---
