title: android createTempFile throws permission denied?
body: <p>This is simple, but not working.  I am trying to create a temp file (later a permanent storage file) for preview of an MP3 file.  I have tried the following variants of the suffix as  following example:</p>
  
  <pre><code>public class StudyFileIo extends Activity {
      private static final String TAG = "StudyFileIo";
  
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.main);
  
          try {
              File tempFooFile = File
              .createTempFile("foo", "dat");
              Log.i(TAG, tempFooFile.getAbsolutePath());
          } catch (IOException e) {
              Log.e(TAG, e.toString());
              e.printStackTrace();
          }
  
      }
  }
  </code></pre>
  
  <p>Log:</p>
  
  <pre><code>09-07 11:25:20.299 E/StudyFileIo( 8859): java.io.IOException: Permission denied
  09-07 11:25:20.299 W/System.err( 8859): java.io.IOException: Permission denied
  09-07 11:25:20.299 W/System.err( 8859):     at java.io.File.createNewFileImpl(Native Method)
  09-07 11:25:20.299 W/System.err( 8859):     at java.io.File.createNewFile(File.java:1160)
  09-07 11:25:20.299 W/System.err( 8859):     at java.io.File.createTempFile(File.java:1224)
  09-07 11:25:20.299 W/System.err( 8859):     at java.io.File.createTempFile(File.java:1182)
  09-07 11:25:20.299 W/System.err( 8859):     at com.mobibob.studyfileio.StudyFileIo.onCreate(StudyFileIo.java:25)
  09-07 11:25:20.299 W/System.err( 8859):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
  09-07 11:25:20.299 W/System.err( 8859):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
  09-07 11:25:20.309 W/System.err( 8859):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
  09-07 11:25:20.309 W/System.err( 8859):     at android.app.ActivityThread.access$2300(ActivityThread.java:125)
  09-07 11:25:20.309 W/System.err( 8859):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
  09-07 11:25:20.309 W/System.err( 8859):     at android.os.Handler.dispatchMessage(Handler.java:99)
  09-07 11:25:20.309 W/System.err( 8859):     at android.os.Looper.loop(Looper.java:123)
  09-07 11:25:20.309 W/System.err( 8859):     at android.app.ActivityThread.main(ActivityThread.java:4627)
  09-07 11:25:20.309 W/System.err( 8859):     at java.lang.reflect.Method.invokeNative(Native Method)
  09-07 11:25:20.309 W/System.err( 8859):     at java.lang.reflect.Method.invoke(Method.java:521)
  09-07 11:25:20.319 W/System.err( 8859):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:876)
  09-07 11:25:20.319 W/System.err( 8859):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:634)
  09-07 11:25:20.319 W/System.err( 8859):     at dalvik.system.NativeStart.main(Native Method)
  </code></pre>
  
  <p>Is there some AndroidManifest.xml setting that I am missing (I am using default manifest)?</p>