Databases
StackOverflow2013
Postsdbo
POAndroid in Eclipse - AsyncTask upon Button click initiates FileWriter
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POAndroid in Eclipse - AsyncTask upon Button click initiates FileWriter
    primarykey
    data
    text
    <p><a href="https://stackoverflow.com/users/217283/eric-nordvik">Eric Nordvik</a> has been helping me with this <a href="https://stackoverflow.com/questions/9529210/android-in-eclipse-invoke-file-writer-class-in-background">issue</a> for some time now so big props to him.</p> <p>This question has sort of evolved into an AsyncTask question so I figured I'd move it here. When my print button (btnPrintTardy) is click I was to start an AsyncTask to save whatever is in the edit text field (editText1) via FileWriter to the SD card as a .text .</p> <p>So far here is my AsyncTask called "FileWriterTask"</p> <pre><code>package com.android.upgrayeddapps.latepass; import java.io.File; import java.io.FileOutputStream; import java.io.OutputStreamWriter; import android.content.Context; import android.os.AsyncTask; import android.view.View; import android.widget.Toast; public class FileWriterTask extends AsyncTask&lt;String, Void, Void&gt; { @Override protected Void doInBackground(String... params) { // write in data folder try { File myFile = new File("/sdcard/StudentLatePass.txt"); myFile.createNewFile(); FileOutputStream fOut = new FileOutputStream(myFile); OutputStreamWriter myOutWriter = new OutputStreamWriter(fOut); myOutWriter.append(params[0]); myOutWriter.close(); fOut.close(); Toast.makeText(getBaseContext(), "Finished writing StudentLatePass.txt'", Toast.LENGTH_SHORT).show(); } catch (Exception e) { Toast.makeText(getBaseContext(), e.getMessage(), Toast.LENGTH_SHORT).show(); } finish(); return null; } private Context getBaseContext() { // TODO Auto-generated method stub return null; } private void finish() { // TODO Auto-generated method stub }; public void onClick(View v) { // clear text box finish(); } } </code></pre> <p>Inside my Student Activity I am calling my FileWriterTask with this code.</p> <pre><code>public void UpdateStudenttxtfile(View View) { EditText txtData = (EditText) findViewById(R.id.editText1); FileWriterTask task = new FileWriterTask(); task.execute(txtData.getText().toString()); } </code></pre> <p>In my studentActivity layout I have the "printbutton's" on Click set to</p> <pre><code>android:onClick="UpdateStudenttxtfile" </code></pre> <p>Now at the moment when I run this I am getting a few exceptions and the program crashes.</p> <pre><code>I/dalvikvm(337): Jit: resizing JitTable from 512 to 1024 W/dalvikvm(337): threadid=9: thread exiting with uncaught exception (group=0x40015560) E/AndroidRuntime(337): FATAL EXCEPTION: AsyncTask #1 E/AndroidRuntime(337): java.lang.RuntimeException: An error occured while executing doInBackground() E/AndroidRuntime(337): at android.os.AsyncTask$3.done(AsyncTask.java:200) E/AndroidRuntime(337): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274) E/AndroidRuntime(337): at java.util.concurrent.FutureTask.setException(FutureTask.java:125) E/AndroidRuntime(337): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308) E/AndroidRuntime(337): at java.util.concurrent.FutureTask.run(FutureTask.java:138) E/AndroidRuntime(337): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088) E/AndroidRuntime(337): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581) E/AndroidRuntime(337): at java.lang.Thread.run(Thread.java:1019) E/AndroidRuntime(337): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() E/AndroidRuntime(337): at android.os.Handler.&lt;init&gt;(Handler.java:121) E/AndroidRuntime(337): at android.widget.Toast.&lt;init&gt;(Toast.java:68) E/AndroidRuntime(337): at android.widget.Toast.makeText(Toast.java:231) E/AndroidRuntime(337): at com.android.upgrayeddapps.latepass.FileWriterTask.doInBackground(FileWriterTask.java:29) E/AndroidRuntime(337): at com.android.upgrayeddapps.latepass.FileWriterTask.doInBackground(FileWriterTask.java:1) E/AndroidRuntime(337): at android.os.AsyncTask$2.call(AsyncTask.java:185) E/AndroidRuntime(337): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306) E/AndroidRuntime(337): ... 4 more D/dalvikvm(337): GC_CONCURRENT freed 1381K, 60% free 2709K/6727K, external 2011K/2137K, paused 7ms+8ms I/Process(337): Sending signal. PID: 337 SIG: 9 </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USCommunity
    1. USUPGRAYEDD
    plurals
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COdo you really need an AsyncTask to do that? I mean - how much stuff will someone write in that EditText?
      singulars
      1. POAndroid in Eclipse - AsyncTask upon Button click initiates FileWriter
      1. UShovanessyan
    2. COEventually we will feed in data from database. ie: Student Name, Time, period, tardy count, warnings, etc. Since I am new to android I am not positive on the best way to handle this.
      singulars
      1. POAndroid in Eclipse - AsyncTask upon Button click initiates FileWriter
      1. USUPGRAYEDD
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload