Java tutorial
/* * Copyright 2013 The Android Open Source Project * * 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.pf; import android.content.Context; import android.content.IntentFilter; import android.os.Message; import android.os.Handler; import android.os.AsyncTask; import android.os.Bundle; import android.support.v4.app.FragmentActivity; import android.support.v4.content.LocalBroadcastManager; import android.util.TypedValue; import android.view.Menu; import android.view.MenuItem; import android.widget.TextView; import android.widget.EditText; import android.content.SharedPreferences; import android.content.Intent; import android.content.BroadcastReceiver; import com.example.android.common.logger.Log; import com.example.android.common.logger.LogFragment; import com.example.android.common.logger.LogWrapper; import com.example.android.common.logger.MessageOnlyLogFilter; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.Reader; import java.io.UnsupportedEncodingException; import java.net.HttpURLConnection; import java.net.URL; /** * Forward a single TCP port to an outside host + port. Only supports one socket * at a time. Source based on com.example.android.networkconnect. */ public class MainActivity extends FragmentActivity { public static final String TAG = "Network Connect"; public static final String PREFS_NAME = "PortForwardingSettings"; public static final String USAGE_UPDATE = "org.pf.USAGE_UPDATE"; Menu menu; boolean forwarding = true; String titleForwarding = "Forwarding. Tap to stop."; String titlePaused = "Paused. Tap to begin."; SimpleTextFragment introFragment; // Reference to the fragment showing events, so we can clear it with a button // as necessary. private LogFragment mLogFragment; TextView localPortView; TextView remotePortView; TextView remoteHostView; int remotePort; int localPort; String remoteHost; BroadcastReceiver updateReceiver = null; LocalBroadcastManager bm; private void killThread() { Intent i = new Intent(this, PortForward.class); stopService(i); } private void readTextViews() { remotePort = Integer.parseInt(remotePortView.getText().toString().trim()); localPort = Integer.parseInt(localPortView.getText().toString().trim()); remoteHost = remoteHostView.getText().toString().trim(); } private void newThread() { readTextViews(); Intent i = new Intent(this, PortForward.class).putExtra("localPort", localPort) .putExtra("remotePort", remotePort).putExtra("remoteHost", remoteHost); startService(i); } @Override protected void onResume() { super.onResume(); listenForUpdate(); } private void listenForUpdate() { try { bm.unregisterReceiver(updateReceiver); } catch (IllegalArgumentException e) { } IntentFilter f = new IntentFilter(); f.addAction(MainActivity.USAGE_UPDATE); bm.registerReceiver(updateReceiver, f); } @Override protected void onPause() { super.onPause(); bm.unregisterReceiver(updateReceiver); } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); if (!isTaskRoot()) { finish(); return; } Log.d(TAG, "Creating Activity"); setContentView(R.layout.sample_main); // Initialize text fragment that displays intro text. introFragment = (SimpleTextFragment) getSupportFragmentManager().findFragmentById(R.id.intro_fragment); introFragment.setText(R.string.welcome_message); introFragment.getTextView().setTextSize(TypedValue.COMPLEX_UNIT_DIP, 16.0f); introFragment.getTextView().setText("Waiting to begin."); initializeLogging(); SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0); remotePort = settings.getInt("remotePort", -1); localPort = settings.getInt("localPort", -1); remoteHost = settings.getString("remoteHost", ""); localPortView = (TextView) findViewById(R.id.local_port); remotePortView = (TextView) findViewById(R.id.remote_port); remoteHostView = (TextView) findViewById(R.id.remote_host); if (localPort > 0) { localPortView.setText(String.valueOf(localPort)); } if (remotePort > 0) { remotePortView.setText(String.valueOf(remotePort)); } if (!remoteHost.equals("")) { remoteHostView.setText(remoteHost); newThread(); } else { forwarding = false; } updateReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { if (intent.getAction().equals(MainActivity.USAGE_UPDATE)) { introFragment.getTextView() .setText(String.format("Up: %.2fkb\nDown: %.2fkb", intent.getIntExtra("bUp", -2000) / 1000.0, intent.getIntExtra("bDown", -2000) / 1000.0)); } } }; bm = LocalBroadcastManager.getInstance(this); listenForUpdate(); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.main, menu); this.menu = menu; setForwardingString(menu.findItem(R.id.fetch_action)); return true; } private void setForwardingString(MenuItem i) { if (forwarding) { i.setTitle(titleForwarding); } else { i.setTitle(titlePaused); } } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { // When the user clicks FETCH, fetch the first 500 characters of // raw HTML from www.google.com. case R.id.fetch_action: this.forwarding = !this.forwarding; if (this.forwarding) { newThread(); } else { killThread(); } setForwardingString(item); return true; case R.id.clear_action: mLogFragment.getLogView().setText(""); readTextViews(); SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0); SharedPreferences.Editor editor = settings.edit(); editor.putInt("localPort", localPort); editor.putInt("remotePort", remotePort); editor.putString("remoteHost", remoteHost); editor.commit(); return true; } return false; } /** Create a chain of targets that will receive log data */ public void initializeLogging() { // Using Log, front-end to the logging chain, emulates // android.util.log method signatures. // Wraps Android's native log framework LogWrapper logWrapper = new LogWrapper(); Log.setLogNode(logWrapper); // A filter that strips out everything except the message text. MessageOnlyLogFilter msgFilter = new MessageOnlyLogFilter(); logWrapper.setNext(msgFilter); // On screen logging via a fragment with a TextView. mLogFragment = (LogFragment) getSupportFragmentManager().findFragmentById(R.id.log_fragment); msgFilter.setNext(mLogFragment.getLogView()); } }