MainActivity.java

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/*
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 * Copyright 2013 The Android Open Source Project
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 *     http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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package com.example.android.basicnetworking;
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import android.content.Context;
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import android.net.ConnectivityManager;
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import android.net.NetworkInfo;
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import android.os.Bundle;
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import android.support.v4.app.FragmentActivity;
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import android.util.TypedValue;
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import android.view.Menu;
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import android.view.MenuItem;
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import com.example.android.common.logger.Log;
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import com.example.android.common.logger.LogFragment;
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import com.example.android.common.logger.LogWrapper;
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import com.example.android.common.logger.MessageOnlyLogFilter;
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/**
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 * Sample application demonstrating how to test whether a device is connected,
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 * and if so, whether the connection happens to be wifi or mobile (it could be
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 * something else).
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 *
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 * This sample uses the logging framework to display log output in the log
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 * fragment (LogFragment).
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 */
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public class MainActivity extends FragmentActivity {
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    public static final String TAG = "Basic Network Demo";
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    // Whether there is a Wi-Fi connection.
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    private static boolean wifiConnected = false;
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    // Whether there is a mobile connection.
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    private static boolean mobileConnected = false;
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    // Reference to the fragment showing events, so we can clear it with a button
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    // as necessary.
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    private LogFragment mLogFragment;
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    @Override
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    protected void onCreate(Bundle savedInstanceState) {
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        super.onCreate(savedInstanceState);
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        setContentView(R.layout.sample_main);
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        // Initialize text fragment that displays intro text.
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        SimpleTextFragment introFragment = (SimpleTextFragment)
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                    getSupportFragmentManager().findFragmentById(R.id.intro_fragment);
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        introFragment.setText(R.string.intro_message);
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        introFragment.getTextView().setTextSize(TypedValue.COMPLEX_UNIT_DIP, 16.0f);
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        // Initialize the logging framework.
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        initializeLogging();
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    }
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    @Override
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    public boolean onCreateOptionsMenu(Menu menu) {
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        getMenuInflater().inflate(R.menu.main, menu);
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        return true;
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    }
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    @Override
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    public boolean onOptionsItemSelected(MenuItem item) {
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        switch (item.getItemId()) {
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            // When the user clicks TEST, display the connection status.
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            case R.id.test_action:
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                checkNetworkConnection();
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                return true;
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            // Clear the log view fragment.
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            case R.id.clear_action:
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                mLogFragment.getLogView().setText("");
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                return true;
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        }
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        return false;
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    }
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    /**
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     * Check whether the device is connected, and if so, whether the connection
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     * is wifi or mobile (it could be something else).
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     */
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    private void checkNetworkConnection() {
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      ConnectivityManager connMgr =
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          (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
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      NetworkInfo activeInfo = connMgr.getActiveNetworkInfo();
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      if (activeInfo != null && activeInfo.isConnected()) {
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          wifiConnected = activeInfo.getType() == ConnectivityManager.TYPE_WIFI;
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          mobileConnected = activeInfo.getType() == ConnectivityManager.TYPE_MOBILE;
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          if(wifiConnected) {
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              Log.i(TAG, getString(R.string.wifi_connection));
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          } else if (mobileConnected){
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              Log.i(TAG, getString(R.string.mobile_connection));
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          }
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      } else {
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          Log.i(TAG, getString(R.string.no_wifi_or_mobile));
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      }
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    }
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    /** Create a chain of targets that will receive log data */
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    public void initializeLogging() {
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        // Using Log, front-end to the logging chain, emulates
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        // android.util.log method signatures.
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        // Wraps Android's native log framework
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        LogWrapper logWrapper = new LogWrapper();
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        Log.setLogNode(logWrapper);
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        // A filter that strips out everything except the message text.
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        MessageOnlyLogFilter msgFilter = new MessageOnlyLogFilter();
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        logWrapper.setNext(msgFilter);
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        // On screen logging via a fragment with a TextView.
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        mLogFragment =
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                (LogFragment) getSupportFragmentManager().findFragmentById(R.id.log_fragment);
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        msgFilter.setNext(mLogFragment.getLogView());
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    }
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}