Java tutorial
/** * ownCloud Android client application * * Copyright (C) 2015 ownCloud Inc. * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2, * as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. * */ package com.synox.android.ui.activity; import java.io.BufferedReader; import java.io.File; import java.io.FileReader; import java.io.IOException; import java.lang.ref.WeakReference; import java.lang.reflect.Field; import java.util.ArrayList; import android.content.ActivityNotFoundException; import android.content.Intent; import android.net.Uri; import android.os.AsyncTask; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentTransaction; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.Toolbar; import android.view.MenuItem; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.TextView; import android.widget.Toast; import com.synox.android.R; import com.synox.android.lib.common.utils.Log_OC; import com.synox.android.ui.dialog.LoadingDialog; import com.synox.android.utils.FileStorageUtils; public class LogHistoryActivity extends AppCompatActivity { private static final String MAIL_ATTACHMENT_TYPE = "text/plain"; private static final String KEY_LOG_TEXT = "LOG_TEXT"; private static final String TAG = LogHistoryActivity.class.getSimpleName(); private static final String DIALOG_WAIT_TAG = "DIALOG_WAIT"; private String mLogPath = FileStorageUtils.getLogPath(); private File logDIR = null; private String mLogText; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.log_send_file); Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); if (toolbar != null) { setSupportActionBar(toolbar); } setTitle(getText(R.string.actionbar_logger)); getSupportActionBar().setDisplayHomeAsUpEnabled(true); Button deleteHistoryButton = (Button) findViewById(R.id.deleteLogHistoryButton); Button sendHistoryButton = (Button) findViewById(R.id.sendLogHistoryButton); TextView logTV = (TextView) findViewById(R.id.logTV); deleteHistoryButton.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Log_OC.deleteHistoryLogging(); finish(); } }); sendHistoryButton.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { sendMail(); } }); if (savedInstanceState == null) { if (mLogPath != null) { logDIR = new File(mLogPath); } if (logDIR != null && logDIR.isDirectory()) { // Show a dialog while log data is being loaded showLoadingDialog(); // Start a new thread that will load all the log data LoadingLogTask task = new LoadingLogTask(logTV); task.execute(); } } else { mLogText = savedInstanceState.getString(KEY_LOG_TEXT); logTV.setText(mLogText); } } @Override public boolean onOptionsItemSelected(MenuItem item) { super.onOptionsItemSelected(item); switch (item.getItemId()) { case android.R.id.home: finish(); break; default: return false; } return true; } /** * Start activity for sending email with logs attached */ private void sendMail() { // For the moment we need to consider the possibility that setup.xml // does not include the "mail_logger" entry. This block prevents that // compilation fails in this case. String emailAddress; try { Class<?> stringClass = R.string.class; Field mailLoggerField = stringClass.getField("mail_logger"); int emailAddressId = (Integer) mailLoggerField.get(null); emailAddress = getString(emailAddressId); } catch (Exception e) { emailAddress = ""; } ArrayList<Uri> uris = new ArrayList<>(); // Convert from paths to Android friendly Parcelable Uri's for (String file : Log_OC.getLogFileNames()) { File logFile = new File(mLogPath, file); if (logFile.exists()) { uris.add(Uri.fromFile(logFile)); } } Intent intent = new Intent(Intent.ACTION_SEND_MULTIPLE); intent.putExtra(Intent.EXTRA_EMAIL, emailAddress); String subject = String.format(getString(R.string.log_send_mail_subject), getString(R.string.app_name)); intent.putExtra(Intent.EXTRA_SUBJECT, subject); intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); intent.setType(MAIL_ATTACHMENT_TYPE); intent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, uris); try { startActivity(intent); } catch (ActivityNotFoundException e) { Toast.makeText(this, getString(R.string.log_send_no_mail_app), Toast.LENGTH_LONG).show(); Log_OC.i(TAG, "Could not find app for sending log history."); } } /** * * Class for loading the log data async * */ private class LoadingLogTask extends AsyncTask<String, Void, String> { private final WeakReference<TextView> textViewReference; public LoadingLogTask(TextView logTV) { // Use of a WeakReference to ensure the TextView can be garbage collected textViewReference = new WeakReference<>(logTV); } protected String doInBackground(String... args) { return readLogFile(); } protected void onPostExecute(String result) { if (textViewReference != null && result != null) { final TextView logTV = textViewReference.get(); if (logTV != null) { mLogText = result; logTV.setText(mLogText); dismissLoadingDialog(); } } } /** * Read and show log file info */ private String readLogFile() { String[] logFileName = Log_OC.getLogFileNames(); //Read text from files StringBuilder text = new StringBuilder(); BufferedReader br = null; try { String line; for (int i = logFileName.length - 1; i >= 0; i--) { File file = new File(mLogPath, logFileName[i]); if (file.exists()) { // Check if FileReader is ready if (new FileReader(file).ready()) { br = new BufferedReader(new FileReader(file)); while ((line = br.readLine()) != null) { // Append the log info text.append(line); text.append('\n'); } } } } } catch (IOException e) { Log_OC.d(TAG, e.getMessage()); } finally { if (br != null) { try { br.close(); } catch (IOException e) { // ignore } } } return text.toString(); } } /** * Show loading dialog */ public void showLoadingDialog() { // Construct dialog LoadingDialog loading = new LoadingDialog(getResources().getString(R.string.log_progress_dialog_text)); FragmentManager fm = getSupportFragmentManager(); FragmentTransaction ft = fm.beginTransaction(); loading.show(ft, DIALOG_WAIT_TAG); } /** * Dismiss loading dialog */ public void dismissLoadingDialog() { Fragment frag = getSupportFragmentManager().findFragmentByTag(DIALOG_WAIT_TAG); if (frag != null) { LoadingDialog loading = (LoadingDialog) frag; loading.dismiss(); } } @Override protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); /// global state outState.putString(KEY_LOG_TEXT, mLogText); } }