Android realizes a black screen automatically during phone calls

Package com.developmenttools.customui.activity;

Import Java.util.HashSet;
Import Java.util.Set;

Import Com.developmenttools.listener.HomeClickListener;
Import Com.yzx.tools.CustomLog;

Import android.app.Activity;
Import Android.content.BroadcastReceiver;
Import Android.content.Context;
Import android.content.Intent;
Import Android.content.IntentFilter;
Import Android.graphics.Color;
Import Android.hardware.Sensor;
Import android.hardware.SensorEvent;
Import Android.hardware.SensorEventListener;
Import Android.hardware.SensorManager;
Import Android.os.Bundle;
Import Android.view.View;
Import Android.view.ViewGroup;
Import Android.view.Window;
Import Android.view.WindowManager;

/**
* Base class Activity
*
* @data: 2012-12-6 4:44:23
*/
public class Basecallactivity extends Baseactivity {

Private Homekeyeventbroadcastreceiver Homekeyeventreceiver;

Private Homeclicklistener Homeclieklistener;

Private set<activity> sproximitydependentactivities = new hashset<activity> ();

Private View ActivityView;

Public synchronized void startproximitysensorforactivity (activity activity) {
if (!sproximitydependentactivities.contains (activity)) {
ActivityView = ((ViewGroup) Activity.getwindow (). Getdecorview (). Findviewbyid (Android. r.id.content)). Getchildat (0);

Sensormanager sm = (Sensormanager) activity.getsystemservice (Context.sensor_service);
Sensor s = sm.getdefaultsensor (sensor.type_proximity);
if (s! = null) {
Sm.registerlistener (Sproximitysensorlistener, S, sensormanager.sensor_delay_ui);
}
Sproximitydependentactivities.add (activity);
}
}

Public synchronized void stopproximitysensorforactivity (activity activity) {
Simulateproximitysensornearby (activity, false);
Sproximitydependentactivities.remove (activity);
Sensormanager sm = (Sensormanager) activity.getsystemservice (Context.sensor_service);
Sm.unregisterlistener (Sproximitysensorlistener);
}

Private Sensoreventlistener Sproximitysensorlistener = new Sensoreventlistener () {
@Override
public void Onsensorchanged (Sensorevent event) {
if (Event.timestamp = = 0) {
Return
}
Proximitynearbychanged (Isproximitysensornearby (event));
}
@Override
public void onaccuracychanged (sensor sensor, int accuracy) {}
};

Public Boolean Isproximitysensornearby (final sensorevent event) {
float threshold = 4.001f; <= 4 cm is near

Final float DISTANCEINCM = event.values[0];
Final float maxdistance = Event.sensor.getMaximumRange ();

Boolean isnear = false;
if (maxdistance >= 1023.0f) {
if (DISTANCEINCM < threshold) {
Isnear = true;
}
} else {
if (maxdistance >= 255.0f) {
if (DISTANCEINCM <= 0.0f) {
Isnear = true;
}
} else {
if (maxdistance <= threshold) {
threshold = MaxDistance;
}
if (DISTANCEINCM < threshold) {
Isnear = true;
}
}
}
return isnear;
}

private void Proximitynearbychanged (Boolean Mlastproximitysensorvaluenearby) {
for (Activity activity:sproximitydependentactivities) {
Simulateproximitysensornearby (activity, Mlastproximitysensorvaluenearby);
}
}

private void Simulateproximitysensornearby (activity activity, Boolean nearby) {
window window = Activity.getwindow ();
Windowmanager.layoutparams params = Activity.getwindow (). GetAttributes ();
if (nearby) {
Params.flags |= WindowManager.LayoutParams.FLAG_FULLSCREEN;
Window.setattributes (params);
View view = new view (activity);
View.setbackgroundcolor (Color.parsecolor ("#000000"));
Window.setcontentview (view);
} else {
Params.flags &= (~windowmanager.layoutparams.flag_fullscreen);
Window.setattributes (params);
if (ActivityView! = null) {
Window.setcontentview (ActivityView);
}
}
}

@Override
protected void OnCreate (Bundle savedinstancestate) {
Intentfilter IFT = new Intentfilter ();
Ift.addaction (Intent.action_close_system_dialogs);
Homekeyeventreceiver = new Homekeyeventbroadcastreceiver ();
Registerreceiver (Homekeyeventreceiver, IFT);
Super.oncreate (savedinstancestate);
}

@Override
protected void OnStart () {
Super.onstart ();
Startproximitysensorforactivity (this);
}

public void Addhomeclicklistener (Homeclicklistener homelistener) {
Homeclieklistener = Homelistener;
}

public class Homekeyeventbroadcastreceiver extends Broadcastreceiver {
Static final String System_reason = "REASON";
Static final String System_home_key = "HomeKey";//HOME KEY
Static final String System_recent_apps = "Recentapps";//Long Home key

@Override
public void OnReceive (context context, Intent Intent) {
if (Intent.getaction (). Equals (Intent.action_close_system_dialogs)) {
String reason = Intent.getstringextra (System_reason);
if (reason! = null) {
if (reason.equals (system_home_key) | | reason.equals (SYSTEM_RECENT_APPS)) {
if (Homeclieklistener! = null) {
Homeclieklistener.onclick ();
}
}
}
}
}
};

@Override
protected void OnPause () {
Super.onpause ();
Stopproximitysensorforactivity (this);
}

@Override
protected void Onrestart () {
Super.onrestart ();
Startproximitysensorforactivity (this);
}

@Override
protected void OnDestroy () {
Stopproximitysensorforactivity (this);
Unregisterreceiver (Homekeyeventreceiver);
Super.ondestroy ();
}
}

Android realizes a black screen automatically during phone calls