Develop Reference

How to close system dialog or notification on OS version 7.0+?

I am developing android app and i want close system dialog programmatically.
I am using this code for closing system dialog, this code is working fine in android 6.0 and below versions but the problem is that it's not working in android 7.0 and android 8.0. How to solve this problem.
Please help me thanks advance.
Intent closeDialog = new Intent(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
sendBroadcast(closeDialog);

If you want to close notification panel,
I am using below code for android Oreo.
Handler collapseNotificationHandler;
#Override
public void onWindowFocusChanged(boolean hasFocus) {
super.onWindowFocusChanged(hasFocus);
Log.d(tag, "window focus changed");
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
collapseNow();
}
}
public void collapseNow() {
try {
// Initialize 'collapseNotificationHandler'
if (collapseNotificationHandler == null) {
collapseNotificationHandler = new Handler();
}
// Post a Runnable with some delay - currently set to 300 ms
collapseNotificationHandler.postDelayed(new Runnable() {
#Override
public void run() {
// Use reflection to trigger a method from 'StatusBarManager'
Object statusBarService = getSystemService("statusbar");
Class<?> statusBarManager = null;
try {
statusBarManager = Class.forName("android.app.StatusBarManager");
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
Method collapseStatusBar = null;
try {
// Prior to API 17, the method to call is 'collapse()'
// API 17 onwards, the method to call is `collapsePanels()`
if (Build.VERSION.SDK_INT > 16) {
collapseStatusBar = statusBarManager.getMethod("collapsePanels");
} else {
collapseStatusBar = statusBarManager.getMethod("collapse");
}
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
collapseStatusBar.setAccessible(true);
try {
collapseStatusBar.invoke(statusBarService);
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
// Currently, the delay is 10 ms. You can change this
// value to suit your needs.
collapseNotificationHandler.postDelayed(this, 10L);
}
}, 10L);
} catch (Exception e) {
e.printStackTrace();
}
}

Number picker start changing value for few seconds

I would like a numberpicker to start changing the values automaticly for few seconds .
private void changeValueByOne(final NumberPicker higherPicker, final boolean increment) {
Method method;
try {
// refelction call for
// higherPicker.changeValueByOne(true);
method = higherPicker.getClass().getDeclaredMethod("changeValueByOne", boolean.class);
method.setAccessible(true);
method.invoke(higherPicker, increment);
} catch (final NoSuchMethodException e) {
e.printStackTrace();
} catch (final IllegalArgumentException e) {
e.printStackTrace();
} catch (final IllegalAccessException e) {
e.printStackTrace();
} catch (final InvocationTargetException e) {
e.printStackTrace();
}
}
I ve implemented this method and tried
Thread thread = new Thread() {
#Override
public void run() {
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
}
runOnUiThread(new Runnable() {
#Override
public void run() {
changeValueByOne(wp,true);
}
});
}
};
thread.start();
But it is not ok .
I would like to have an effect as a slot machine .

Why can't you simply set the value to an incremented value? Something like this:
private void changeValueByOne(final NumberPicker higherPicker) {
int oldValue = higherPicker.getValue();
higherPicker.setValue(oldValue++);
}
EDIT
Here is the source of the method you're reflecting:
private void changeValueByOne(boolean increment) {
if (mHasSelectorWheel) {
mInputText.setVisibility(View.INVISIBLE);
if (!moveToFinalScrollerPosition(mFlingScroller)) {
moveToFinalScrollerPosition(mAdjustScroller);
}
mPreviousScrollerY = 0;
if (increment) {
mFlingScroller.startScroll(0, 0, 0, -mSelectorElementHeight, SNAP_SCROLL_DURATION);
} else {
mFlingScroller.startScroll(0, 0, 0, mSelectorElementHeight, SNAP_SCROLL_DURATION);
}
invalidate();
} else {
if (increment) {
setValueInternal(mValue + 1, true);
} else {
setValueInternal(mValue - 1, true);
}
}
}
You can see that if mHasSelectorWheel = true, it calls the startScroll method. In other words, it sounds like your NumberPicker has mHasSelectorWheel = false, in which case you're out of luck given your current implementation. It is highly advisable that you look into a custom scrollable number picker widget.

How can I stop calling with codes in android?

I have created an application that calls a number. It is working but I want to close the calling after 30 sec. How can I do that?
My code is:
MyTimer = new CountDownTimer(60000, 30000) {
public void onTick(long millisUntilFinished) {
intent.setData(Uri.parse("tel:" + num2 + ""));
startActivity(intent);
}
public void onFinish() {
}
}.start();

You'll need some Reflection for that. First, create this interface:
package com.android.internal.telephony;
public interface ITelephony {
boolean endCall();
void answerRingingCall();
void silenceRinger();
}
And end call with this:
private void endCall() {
TelephonyManager telephonyManager = (TelephonyManager) this
.getSystemService(Context.TELEPHONY_SERVICE);
Class<?> myClass = null;
try {
myClass = Class.forName(telephonyManager.getClass().getName());
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
Method method = null;
try {
method = myClass.getDeclaredMethod("getITelephony");
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
method.setAccessible(true);
ITelephony telephonyService = null;
try {
telephonyService = (ITelephony) method.invoke(telephonyManager);
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
telephonyService.endCall();
}
Modified answer from here.
EDIT: Adding example:Add this to some button click
//Start call
makeCall(phoneNumber);
//wait several seconds
try {
long time = holdCallSeconds * 1000;
Thread.sleep(time);
} catch (InterruptedException e) {
e.printStackTrace();
}
//hang up
endCall();
void makeCall(String phoneNumber) {
Intent intent = new Intent(Intent.ACTION_CALL);
intent.setData(Uri.parse(phoneNumber));
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.addFlags(Intent.FLAG_FROM_BACKGROUND);
startActivity(intent);
}

How to implement cross process lock in android?

I'm writing a library project for multiple APPs to use. And for some reason, I must make a function mutual exclusion for different APPs, so I need a cross-process lock. But as far as I know, in android APPs can only write to it's own file's directory in internal storage, and external storage is unreliable because some device don't have one. So file lock seems not applicable for me, so is there any other way to implement cross-process lock?
thanks~

If you do not want to (or you can not) use flock or fcntl, maybe you can use LocalServerSocket to implement a spinlock.
For example:
public class SocketLock {
public SocketLock(String name) {
mName = name;
}
public final synchronized void tryLock() throws IOException {
if (mServer == null) {
mServer = new LocalServerSocket(mName);
} else {
throw new IllegalStateException("tryLock but has locked");
}
}
public final synchronized boolean timedLock(int ms) {
long expiredTime = System.currentTimeMillis() + ms;
while (true) {
if (System.currentTimeMillis() > expiredTime) {
return false;
}
try {
try {
tryLock();
return true;
} catch (IOException e) {
// ignore the exception
}
Thread.sleep(10, 0);
} catch (InterruptedException e) {
continue;
}
}
}
public final synchronized void lock() {
while (true) {
try {
try {
tryLock();
return;
} catch (IOException e) {
// ignore the exception
}
Thread.sleep(10, 0);
} catch (InterruptedException e) {
continue;
}
}
}
public final synchronized void release() {
if (mServer != null) {
try {
mServer.close();
} catch (IOException e) {
// ignore the exception
}
}
}
private final String mName;
private LocalServerSocket mServer;
}

Android pairing bluetooth devices without dialog with pin

I want pairing my android cellphone and SPP bluetooth without dialog with pin and confirmation. I have this code, register BroadcastReceiver:
IntentFilter filter = new IntentFilter(ACTION_PAIRING_REQUEST);
registerReceiver(mPairReceiver, filter);
pairDevice(device);
pairDevice method:
private void pairDevice(BluetoothDevice device) {
try {
Method method = device.getClass().getMethod("createBond", (Class[]) null);
method.invoke(device, (Object[]) null);
} catch (Exception e) {
e.printStackTrace();
}
}
BroadcastReceiver:
private final BroadcastReceiver mPairReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (ACTION_PAIRING_REQUEST.equals(action)) {
System.out.println("ACTION_PAIRING_REQUEST");
setBluetoothPairingPin(device);
}
}
};
setBluetoothPairingPin method:
public void setBluetoothPairingPin(BluetoothDevice device)
{
byte[] pinBytes = convertPinToBytes("0000");
try {
Log.d(TAG, "Try to set the PIN");
Method m = device.getClass().getMethod("setPin", byte[].class);
m.invoke(device, pinBytes);
Log.d(TAG, "Success to add the PIN.");
try {
device.getClass().getMethod("setPairingConfirmation", boolean.class).invoke(device, false);
Log.d(TAG, "Success to setPairingConfirmation.");
} catch (Exception e) {
// TODO Auto-generated catch block
Log.e(TAG, e.getMessage());
e.printStackTrace();
}
} catch (Exception e) {
Log.e(TAG, e.getMessage());
e.printStackTrace();
}
}
but always show dialog with pin and confirmation.