Android 工作室 Java。 在后台显示一个弹窗 window

Question

How do I display a popup when an app is in the background? For example, I took the GetContact application, when a call is received from the user, a window with information about the call pops up on the screen. How can this be done? It is desirable with code examples, I will be very grateful. Thank. enter image description here

Answer 1

• Add required permissions in your app manifest file:

   <uses-permission android:name="android.permission.CALL_PHONE" /> <uses-permission android:name="android.permission.PROCESS_OUTGOING_CALLS" /> <uses-permission android:name="android.permission.READ_PHONE_STATE" /> <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

• Incoming call reciever

  public class IncomingCallReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { try { System.out.println("Receiver start"); String state = intent.getStringExtra(TelephonyManager.EXTRA_STATE); String incomingNumber = intent.getStringExtra(TelephonyManager.EXTRA_INCOMING_NUMBER); if (state.equals(TelephonyManager.EXTRA_STATE_RINGING)) { Toast.makeText(context, "Incoming Call State", Toast.LENGTH_SHORT).show(); Toast.makeText(context, "Ringing State Number is -" + incomingNumber, Toast.LENGTH_SHORT).show(); } } catch (Exception e) { e.printStackTrace(); } }

• Ask Runtime permission in your MainActivity.

• Add overlay view to display notification in screen.

   WindowManager wm =(WindowManager)getSystemService(Context.WINDOW_SERVICE); View view = LayoutInflater.from(context).inflate(R.layout.test, null) wm.addView(view, mParams)

Answer 2

What you're looking for is Drawing over other apps. It's a tricky feature of android that I personally love. You have to deal with WindowManager and you need SYSTEM_ALERT_WINDOW permission

Implementations are huge and I guess it's better to give you some links.

Here's a good explanation about floating widgets https://medium.com/@kevalpatel2106/create-chat-heads-like-facebook-messenger-32f7f1a62064

This is kinda close to what you want: https://github.com/codebyshubham/Calling_Person_History

Also remember that custom roms like Xiaomi have some restrictions on these widgets. Also a great open source floating app is called QuickLyric take a look at it it might help you a lot