activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/rl" android:layout_width="match_parent" android:layout_height="match_parent" android:padding="10dp" tools:context=".MainActivity" android:background="#cfd4ca" > <TextView android:id="@+id/tv" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="40sp" android:padding="25sp" android:fontFamily="sans-serif-condensed" android:textStyle="bold" /> <Button android:id="@+id/btn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/tv" android:text="Switch Between Wifi Service State" /> </RelativeLayout> MainActivity.java
package com.cfsuman.me.androidcodesnippets; import android.app.Activity; import android.content.Context; import android.graphics.Color; import android.graphics.drawable.ColorDrawable; import android.net.wifi.WifiManager; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.view.Window; import android.widget.Button; import android.widget.RelativeLayout; import android.widget.TextView; public class MainActivity extends AppCompatActivity { private Context mContext; private Activity mActivity; private RelativeLayout mRelativeLayout; private TextView mTextView; private Button mButton; private WifiManager mWifiManager; @Override protected void onCreate(Bundle savedInstanceState) { // Request window feature action kafe requestWindowFeature(Window.FEATURE_ACTION_BAR); super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // Get the application context mContext = getApplicationContext(); // Get the activity mActivity = MainActivity.this; /* WifiManager This class provides the primary API for managing all aspects of Wi-Fi connectivity. Get an instance of this class by calling Context.getSystemService(Context.WIFI_SERVICE). It deals with several categories of items: The list of configured networks. The list can be viewed and updated, and attributes of individual entries can be modified. The currently active Wi-Fi network, if any. Connectivity can be established or turn down, and dynamic information about the state of the network can be queried. Results of access point scans, containing enough information to make decisions about what access point to connect to. It defines the names of various Intent actions that are broadcast upon any sort of change in Wi-Fi state. This is the API to use when performing Wi-Fi specific operations. To perform operations that pertain to network connectivity at an abstract level, use ConnectivityManager. */ // Get an instance of WifiManager mWifiManager = (WifiManager) this.getSystemService(Context.WIFI_SERVICE); // Change the action kafe color getSupportActionBar().setBackgroundDrawable( new ColorDrawable(Color.parseColor("#FFFF0000")) ); // Get the widgets reference from XML layout mRelativeLayout = (RelativeLayout) findViewById(R.id.rl); mButton = (Button) findViewById(R.id.btn); mTextView = (TextView) findViewById(R.id.tv); // Set a click listener for button widget mButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { // Check the wifi status if(isWifiOn()){ /* public boolean setWifiEnabled (boolean enabled) Enable or disable Wi-Fi. Parameters enabled true to enable, false to disable. Returns true : if the operation succeeds (or if the existing state is the same as the requested state). */ // If wifi is on then off it mWifiManager.setWifiEnabled(false); designWifiOffState(); }else { // If wifi is disabled then enable it mWifiManager.setWifiEnabled(true); designWifiOnState(); } } }); } // Custom method to check wifi enable disable state protected boolean isWifiOn(){ /* public boolean isWifiEnabled () Return whether Wi-Fi is enabled or disabled. Returns true if Wi-Fi is enabled */ return mWifiManager.isWifiEnabled(); } // Custom method to design wifi service enable state protected void designWifiOnState(){ mTextView.setText("Wifi Service Is Enabled."); mTextView.setTextColor(Color.BLUE); mButton.setText("Disable Wifi Service"); } // Custom method to design wifi service disable state protected void designWifiOffState(){ mTextView.setText("Wifi Service Is Disabled."); mTextView.setTextColor(Color.RED); mButton.setText("Enable Wifi Service"); } } AnidroidManifest.xml [Permission]
<uses-permission android:name="android.permission.INTERNET"/> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/> <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/> <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/> 
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