Systemservice (system service)

android The system gives us a lot of services , For our development and use , for example , Check network usage , Equipment power ,SD Card installation or removal , Some application information, etc .

Simple acquisition android A few simple services

public class MainActivity extends ActionBarActivity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		setContentView(R.layout.activity_main);
	}
	public void doClick(View v)
	{
		switch(v.getId())
		{
		case R.id.getvoice:
			AudioManager mAudioManager= (AudioManager) MainActivity.this.getSystemService(AUDIO_SERVICE);
			 int max = mAudioManager.getStreamMaxVolume(AudioManager.STREAM_SYSTEM);// Get the maximum volume of the system 
			 int current = mAudioManager.getStreamVolume(AudioManager.STREAM_RING);// Get the current volume 
			 Toast.makeText(MainActivity.this, " The maximum volume of the system is ："+max+", Current volume is ："+current, Toast.LENGTH_SHORT).show();
			break;
		case R.id.enableOrDisable_WIFI:
			WifiManager wifiManager =	(WifiManager) MainActivity.this.getSystemService(WIFI_SERVICE);
			if (wifiManager.isWifiEnabled()) {
				// Decide whether to open , Turn it off if you turn it on 
				wifiManager.setWifiEnabled(false);
				Toast.makeText(MainActivity.this, "WIFI It's closed ", Toast.LENGTH_SHORT).show();
			}else {
				// Decide whether to open , Turn it on if you close it 
				wifiManager.setWifiEnabled(true);
				Toast.makeText(MainActivity.this, "WIFI Already open ", Toast.LENGTH_SHORT).show();
			}
			break;
		case R.id.getPackagename:
			ActivityManager activityManager = (ActivityManager) MainActivity.this.getSystemService(ACTIVITY_SERVICE);
			String packageName = activityManager.getRunningTasks(1).get(0).topActivity.getPackageName();// obtain Activity The package name 
			Toast.makeText(MainActivity.this, " Currently running Activity Package name ："+packageName, Toast.LENGTH_SHORT).show();
			break;
		case R.id.network:
			if (isNetWorkConnected(MainActivity.this)==true) {
				Toast.makeText(MainActivity.this, " The network has been turned on ", Toast.LENGTH_SHORT).show();
			}else {
				Toast.makeText(MainActivity.this, " Network not connected ", Toast.LENGTH_SHORT).show();
			}
			break;
		}
	}
	private boolean isNetWorkConnected(Context context) {
		// TODO Auto-generated method stub
		if (context != null) {
			ConnectivityManager mConnectivityManager = (ConnectivityManager) context
					.getSystemService(CONNECTIVITY_SERVICE);
			NetworkInfo mNetWorkInfo = mConnectivityManager
					.getActiveNetworkInfo();
			if (mNetWorkInfo != null) {
				return mNetWorkInfo.isAvailable();
			}
		}
		return false;
	}


}

Make the layout by yourself according to the pictures , Don't post it here

}