Android various manager-Guo Tong

First, PowerManager

Mainly used to control power state, set screen status, and battery standby status

PowerManager pm = ((PowerManager) Getsystemservice (Power_service));

Here I need to keep the screen awake for a long time, not being locked, so I call WakeLock .

WakeLock wake = Pm.newwakelock (Powermanager.screen_bright_wake_lock |powermanager.on_after_release, * * Activity.class);

Wake.acquire ();// Request Execution

related to flag:

Partial_wake_lock: Keep the CPU running, and the screen and keyboard lights may be off.

Screen_dim_wake_lock: Keep the CPU running, allow the screen to be displayed but may be gray, allow to turn off the keyboard light

Screen_bright_wake_lock: Keeps the CPU running, allowing the screen to be highlighted, allowing the keyboard light to be turned off

Full_wake_lock : keep the CPU Running, keep the screen highlighted, and the keyboard lights remain bright

permission to obtain :

<uses-permission android:name= "Android.permission.WAKE_LOCK"/>

Second, WindowManager

Call window, set the value of the screenbrightness parameter inside the window , but briefly set the brightness of the screen brightness, in a Activity can only take effect below.

/**

* set screen brightness

*/

private void Setwindowscreen () {

Window Localwindow = GetWindow ();

Windowmanager.layoutparams locallayoutparams = Localwindow.getattributes ();

float F = 5/255.0f;

Locallayoutparams.screenbrightness = f;

Localwindow.setattributes (Locallayoutparams);

}

get permission :

<uses-permission android:name= "Android.permission.SYSTEM_ALERT_WINDOW"/>

It is found that only in the current activity , the relevant values under the system file need to be changed to invoke the Uri(similar link) method.

/**

* save screen with minimum brightness

* Save Light State

**/

public void savebrightness (Contentresolver resolver) {

Uri uri = android.provider.Settings.System.getUriFor ("screen_brightness");

Android.provider.Settings.System.putInt (resolver, "screen_brightness", 0);

Resolver.notifychange (URI, NULL);

}

Third, Wifimanager

is the unlimited management related, similar to get wifi link name, determine whether links, switches and other and wireless related.

Wifimanager manager = (Wifimanager) context.getsystemservice (Context.wifi_service);

Wifiinfo info = Manager.getconnectioninfo ();

Wifiinfo contains a lot of things, unlimited IP, name,issid, physical address and so much more information, here I need to get to see if the link Lab wireless get wireless name, The name is SSID.

String ssId = Info.getssid ();

Manager.setwifienabled (TRUE);// turn on wifi

Manager.setwifienabled (false);// Turn off WiFi

Related permissions:

<uses-permission android:name= "Android.permission.ACCESS_WIFI_STATE"/>

<uses-permission android:name= "Android.permission.CHANGE_WIFI_STATE"/>

Four, Connectivitymanager

Primarily manages network connection related operations.

Connectivitymanager Connmanager = (Connectivitymanager)

Context.getsystemservice (Context.connectivity_service);

Networkinfo NetInfo = Connmanager.getnetworkinfo (Connectivitymanager.type_wifi)

Networkinfo contains information about the network connection, including the connection status, whether the network is available, and other related operations

int code = netinfo.getstate ();

if (wifistate = = State.connected | | wifistate = = state.connecting)

Return 200;// Connection succeeded

Else

return 500; Connection Failed

Related permissions:

<uses-permission android:name= "Android.permission.ACCESS_NETWORK_STATE"/>

Five, Activitymanager

are all running in the system. Activity Interaction provides an interface, the main interface around the running process information, task information, service information and so on.

Activitymanager am = (activitymanager) this.getsystemservice (Activity_service);

Memoryinfo mi = new Memoryinfo ();

Am.getmemoryinfo (MI);

Am.getrunningappprocesses ();

Am.getrunningservices ();

Am.getdeviceconfigurationinfo ();

Am.killbackgroundprocessed (PackageName);

Am.restartpackage (PackageName);

Android various manager-Guo Tong