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POUnable to open stack trace file '/data/anr/traces.txt': Permission denied while the permission is granted
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copied!<p>I'm writing an Android application with Eclipse, everything works properly if I write the application as follows:</p> <pre><code>import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.io.Reader; import java.io.Writer; import android.app.Activity; import android.os.Bundle; import android.util.Log; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.widget.EditText; public class HTableActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); } public boolean onCreateOptionsMenu(Menu menu){ super.onCreateOptionsMenu(menu); MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.mymenu, menu); return true; } public boolean onOptionsItemSelected(MenuItem item){ if (item.getItemId() == R.id.save_item){ save("testo.txt"); return true; } else if (item.getItemId() == (R.id.load_item)) { load("testo.txt"); return true; } else return false; } private void save(String filename){ StringBuffer aux = new StringBuffer(); Writer writer = null; //scrittore EditText[] textAreas = new EditText[3]; textAreas[0] = (EditText) findViewById(R.id.editText1); textAreas[1] = (EditText) findViewById(R.id.editText2); textAreas[2] = (EditText) findViewById(R.id.editText3); for(EditText et : textAreas){ aux.append( et.getText().toString() + "\n"); } try{ writer = new OutputStreamWriter(this.openFileOutput(filename, MODE_PRIVATE)); writer.write(aux.toString()); }catch (IOException e){ Log.e("Hash Table", "Impossibile salvare il file", e); } finally{ if (writer != null){ try { writer.close(); } catch (Throwable t) { Log.e("Hash Table", "Impossibile chiudere il file", t); } } } } private void load(String filename){ StringBuffer aux = new StringBuffer(); Reader reader = null; String[] splits; int i=0; EditText[] textAreas = new EditText[3]; textAreas[0] = (EditText) findViewById(R.id.editText1); textAreas[1] = (EditText) findViewById(R.id.editText2); textAreas[2] = (EditText) findViewById(R.id.editText3); try{ reader = new InputStreamReader(openFileInput(filename)); char[] buf = new char[1024]; int len; while ((len = reader.read(buf)) != -1) { aux.append(buf, 0, len); } splits = aux.toString().split("\\n"); for(EditText et : textAreas){ et.setText(splits[i++]); } } catch (FileNotFoundException e) { Log.e("Hash Table", "File non trovato", e); } catch (IOException e) { Log.e("Hash Table", "Impossibile aprire il file", e); } finally { if (reader != null) { try { reader.close(); } catch (Throwable t) { Log.e("Hash Table", "Impossibile chiudere il file", t); } } } } } </code></pre> <p>But given that the following variables:</p> <pre><code> EditText[] textAreas = new EditText[3]; textAreas[0] = (EditText) findViewById(R.id.editText1); textAreas[1] = (EditText) findViewById(R.id.editText2); textAreas[2] = (EditText) findViewById(R.id.editText3); </code></pre> <p>Appear both in the load method than in the save, I wanted to make them "global" as follows:</p> <pre><code>import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.io.Reader; import java.io.Writer; import android.app.Activity; import android.os.Bundle; import android.util.Log; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.widget.EditText; public class HTableActivity extends Activity { public EditText textAreas; HTableActivity (){ textAreas = new EditText[3]; textAreas[0] = (EditText) findViewById(R.id.editText1); textAreas[1] = (EditText) findViewById(R.id.editText2); textAreas[2] = (EditText) findViewById(R.id.editText3); } /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); } public boolean onCreateOptionsMenu(Menu menu){ super.onCreateOptionsMenu(menu); MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.mymenu, menu); return true; } public boolean onOptionsItemSelected(MenuItem item){ if (item.getItemId() == R.id.save_item){ save("testo.txt"); return true; } else if (item.getItemId() == (R.id.load_item)) { load("testo.txt"); return true; } else return false; } private void save(String filename){ StringBuffer aux = new StringBuffer(); Writer writer = null; for(EditText et : textAreas){ aux.append( et.getText().toString() + "\n"); } try{ writer = new OutputStreamWriter(this.openFileOutput(filename, MODE_PRIVATE)); writer.write(aux.toString()); }catch (IOException e){ Log.e("Hash Table", "Impossibile salvare il file", e); } finally{ if (writer != null){ try { writer.close(); } catch (Throwable t) { Log.e("Hash Table", "Impossibile chiudere il file", t); } } } } private void load(String filename){ StringBuffer aux = new StringBuffer(); Reader reader = null; String[] splits; int i=0; try{ reader = new InputStreamReader(openFileInput(filename)); char[] buf = new char[1024]; int len; while ((len = reader.read(buf)) != -1) { aux.append(buf, 0, len); } splits = aux.toString().split("\\n"); for(EditText et : textAreas){ et.setText(splits[i++]); } } catch (FileNotFoundException e) { Log.e("Hash Table", "File non trovato", e); } catch (IOException e) { Log.e("Hash Table", "Impossibile aprire il file", e); } finally { if (reader != null) { try { reader.close(); } catch (Throwable t) { Log.e("Hash Table", "Impossibile chiudere il file", t); } } } } } </code></pre> <p>I also added the permissions:</p> <pre><code><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> </code></pre> <p>in the Android manifest, but despite this, when I start the application I get the following error:</p> <pre><code>E/dalvikvm(384): Unable to open stack trace file '/data/anr/traces.txt': Permission denied </code></pre> <p>Can someone explain why this change of code causes this error?</p> <p>Full StackTrace:</p> <pre><code>[2012-05-27 13:11:00 - HTable] ------------------------------ [2012-05-27 13:11:00 - HTable] Android Launch! [2012-05-27 13:11:00 - HTable] adb is running normally. [2012-05-27 13:11:00 - HTable] Performing corso.terminali.HTableActivity activity launch [2012-05-27 13:11:00 - HTable] Automatic Target Mode: using existing emulator 'emulator-5554' running compatible AVD 'MyDevice1.6' [2012-05-27 13:11:00 - HTable] Uploading HTable.apk onto device 'emulator-5554' [2012-05-27 13:11:00 - HTable] Installing HTable.apk... [2012-05-27 13:11:03 - HTable] Success! [2012-05-27 13:11:03 - HTable] Starting activity corso.terminali.HTableActivity on device emulator-5554 [2012-05-27 13:11:05 - HTable] ActivityManager: Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=corso.terminali/.HTableActivity } </code></pre> <p>I have also implemented a virtual SD Card 512 MB, in my Android emulator (version 1.6) integrated with eclipse. </p> <p><strong>I kept trying, and I came to the conclusion that you can declare and initialize, globally, the array textareas (EditText textareas EditText > = new [n]), but you can not carry out a global assignment of IDs, either in the constructor, that in the method "public void onCreate > ()", which would cause an error when the methods "save" and "load" are > called. Therefore, although I'm not understanding the reasons, I think > the best solution is to declare the array "textareas" globally, and > then proceed to the allocation of IDs "textareas [n] = (EditText) > findViewById (R.Id.editTextn) "in both forms 'save' and 'load'. If > anyone knows why this happens, please let me know.</strong></p> <hr> <p>I kept trying, and I came to the conclusion that you can declare and initialize, globally, the array textareas (EditText textareas EditText > = new [n]), but you can not carry out a global assignment of IDs, either in the constructor, that in the method "public void onCreate > ()", which would cause an error when the methods "save" and "load" are > called. Therefore, although I'm not understanding the reasons, I think > the best solution is to declare the array "textareas" globally, and > then proceed to the allocation of IDs "textareas [n] = (EditText) > findViewById (R.Id.editTextn) "in both forms 'save' and 'load'. If > anyone knows why this happens, please let me know.</p>

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