Sunmi Developer Docs

K2mini is a special self-service device, the two screens all could be set as main screen, you can refer the code below to adapt：

Double screen function：
We use class called :Presentation to implement the different display on the double screen：
First is the permission
Create a class to extend Presentation
public class TextDisplay extends Presentation

To get the second screen

public Display getPresentationDisplays() {
DisplayManager mDisplayManager = (DisplayManager) getSystemService(Context.DISPLAY_SERVICE);
displays = mDisplayManager.getDisplays();
for (int i = 0; i ‹ displays.length; i++) {
Log.e(TAG, “Screen” + displays[i]);
if ((displays[i].getFlags() & Display.FLAG_SECURE) != 0
&& (displays[i].getFlags() & Display.FLAG_SUPPORTS_PROTECTED_BUFFERS) != 0
&& (displays[i].getFlags() & Display.FLAG_PRESENTATION) != 0) {
Log.e(TAG, “First real second screen” + displays[i]);
return displays[i];
}
}
return null;
}

Display the second screen

textDisplay=newTextDisplay(this,getPresentationDisplays());

textDisplay.show();

Remind：
If you want the main screen Activity to return to the desktop, the secondary screen View is still displayed, you can use the following code to complete：

getWindow()/*second screen
Window*/.setType(WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY);

Note: When adding this type of Window to a normal application, you need to use the following code to apply for permission

if (!Settings.canDrawOverlays(this)) {
     Toast.makeText(this," 请同意显示窗口权限 ", Toast.LENGTH_SHORT).show();
     startActivity(new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION));
 }

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