Java tutorial
/* * Copyright (C) 2012 Pixmob (http://github.com/pixmob) * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.pixmob.freemobile.netstat.ui; import android.content.Context; import android.database.Cursor; import android.os.AsyncTask; import android.os.Environment; import android.support.v4.app.DialogFragment; import android.support.v4.app.FragmentManager; import android.util.Log; import android.widget.Toast; import org.pixmob.freemobile.netstat.R; import org.pixmob.freemobile.netstat.content.NetstatContract.Events; import org.pixmob.freemobile.netstat.util.IOUtils; import java.io.BufferedWriter; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStreamWriter; import java.text.DateFormat; import java.text.SimpleDateFormat; import static org.pixmob.freemobile.netstat.Constants.TAG; /** * Export database to a file on the external storage. * @author Pixmob */ class ExportTask extends AsyncTask<Void, Integer, Boolean> { private static final String DIALOG_TAG = "export"; private static final String LINE_SEP = "\r\n"; private static final String COL_SEP = ";"; private static final String DATE_FORMAT = "dd/MM/yyyy HH:mm:ss"; private final Context context; private FragmentManager fragmentManager; private boolean aborted; private boolean onSavedInstanceCalled; public ExportTask(final Context context, final FragmentManager fragmentManager) { this.context = context; this.fragmentManager = fragmentManager; } public void setFragmentManager(FragmentManager fragmentManager) { this.fragmentManager = fragmentManager; } @Override protected Boolean doInBackground(Void... params) { if (aborted) { return false; } try { export(); Log.i(TAG, "Export done"); } catch (IOException e) { Log.e(TAG, "Failed to export database", e); return false; } return true; } @Override protected void onProgressUpdate(Integer... values) { final ExportDialogFragment f = (ExportDialogFragment) fragmentManager.findFragmentByTag(DIALOG_TAG); if (f != null) { final int current = values[0]; final int total = values[1]; f.update(current, total); } } @Override protected void onPreExecute() { if (!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) { Log.w(TAG, "External storage is not available"); Toast.makeText(context, context.getString(R.string.external_storage_not_available), Toast.LENGTH_SHORT) .show(); aborted = true; } else { new ExportDialogFragment().show(fragmentManager, DIALOG_TAG); } } @Override protected void onPostExecute(Boolean result) { dismissDialog(); if (result) { Toast.makeText(context, R.string.export_done, Toast.LENGTH_SHORT).show(); } else { Toast.makeText(context, R.string.export_error, Toast.LENGTH_SHORT).show(); } } @Override protected void onCancelled(Boolean result) { dismissDialog(); } private void dismissDialog() { final DialogFragment f = (DialogFragment) fragmentManager.findFragmentByTag(DIALOG_TAG); if ((f != null) && (!onSavedInstanceCalled)) { f.dismiss(); } // Clear reference to avoid memory leaks. fragmentManager = null; } private void export() throws IOException { final File outputFile = new File(Environment.getExternalStorageDirectory(), "freemobilenetstat.csv"); Log.i(TAG, "Exporting database to " + outputFile.getPath()); final DateFormat dateFormatter = new SimpleDateFormat(DATE_FORMAT); final BufferedWriter out = new BufferedWriter( new OutputStreamWriter(new FileOutputStream(outputFile), "UTF-8")); Cursor c = null; try { c = context.getContentResolver().query(Events.CONTENT_URI, new String[] { Events.TIMESTAMP, Events.MOBILE_OPERATOR, Events.MOBILE_NETWORK_TYPE, Events.MOBILE_CONNECTED, Events.WIFI_CONNECTED, Events.BATTERY_LEVEL, Events.SCREEN_ON, Events.POWER_ON, Events.FEMTOCELL, Events.FIRST_INSERT }, null, null, null); final int rowCount = c.getCount(); int currentRow = 0; final StringBuilder buf = new StringBuilder(1024); buf.append("Timestamp").append(COL_SEP).append("Mobile Operator").append(COL_SEP) .append("Mobile Network Type").append(COL_SEP).append("Mobile Connected").append(COL_SEP) .append("Femtocell").append(COL_SEP).append("Wi-Fi Connected").append(COL_SEP) .append("Screen On").append(COL_SEP).append("Battery").append(COL_SEP).append("Power On") .append(COL_SEP).append("First Insert").append(LINE_SEP); out.write(buf.toString()); while (c.moveToNext()) { final long t = c.getLong(0); final String mobOp = c.isNull(1) ? "" : c.getString(1); final int mobNetworkType = c.getInt(2); final int mobConn = c.getInt(3) == 1 ? 1 : 0; final int wifiOn = c.getInt(4) == 1 ? 1 : 0; final int bat = c.getInt(5); final int screenOn = c.getInt(6) == 1 ? 1 : 0; final int powerOn = c.getInt(7) == 1 ? 1 : 0; final int femtocell = c.getInt(8) == 1 ? 1 : 0; final int firstInsert = c.getInt(9) == 1 ? 1 : 0; buf.delete(0, buf.length()); buf.append(dateFormatter.format(t)).append(COL_SEP).append(mobOp).append(COL_SEP) .append(mobNetworkType).append(COL_SEP).append(mobConn).append(COL_SEP).append(femtocell) .append(COL_SEP).append(wifiOn).append(COL_SEP).append(screenOn).append(COL_SEP).append(bat) .append(COL_SEP).append(powerOn).append(COL_SEP).append(firstInsert).append(LINE_SEP); out.write(buf.toString()); publishProgress(++currentRow, rowCount); } } finally { try { if (c != null) c.close(); } catch (Exception ignore) { } IOUtils.close(out); } } public void onSavedInstanceCalled() { onSavedInstanceCalled = true; } }