Android-O launch on secondary display

问题

The new ActivityOptions setLaunchDisplayId (int launchDisplayId) function in Android-O seems to always crash my app when I try to launch an activity intent.

Both when I launch activities from my own app and when I try to launch other apps i.e. Chrome Canary.

Does anyone know if this is a general problem with the new API's or am I missing something:

A small snippet of my code is below:

options.setLaunchDisplayId(1); startActivity(intent, options);

NOTE I was testing with 'simulate a second screen' enabled (@1080p if it matters).

UPDATE I have tried the ADB command adb shell start com.chrome.canary --display 1, and I get the message:

start: must be root

回答1:

I have connected to the second screen via the new API's with the code below, but as of yet have no way of interacting with it.

 Bundle bdl;
 MediaRouter mediaRouter = (MediaRouter) mContext.getSystemService(Context.MEDIA_ROUTER_SERVICE);
 MediaRouter.RouteInfo route = mediaRouter.getSelectedRoute(MediaRouter.ROUTE_TYPE_LIVE_VIDEO);
 if (route != null) {
     Display presentationDisplay = route.getPresentationDisplay();
     bdl = ActivityOptions.makeClipRevealAnimation(mView, left, top, width, height).setLaunchBounds(rect).setLaunchDisplayId(presentationDisplay.getDisplayId()).toBundle();
     Bundle optsBundle = true ? bdl : null;
     Intent intent = new Intent(mContext, SecondaryActivity.class);
     intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
     mContext.startActivity(intent, optsBundle);
 }

回答2:

Here's a simplified answer which is working for me, built off of @Smiler. I tested this via a Button click in my MainActivity. Thanks for the help!

    ((Button) findViewById(R.id.launchTopScreen)).setOnClickListener(v -> {
        Intent intent = getPackageManager().getLaunchIntentForPackage("com.example.new.app");
        intent.addFlags(Intent.FLAG_ACTIVITY_LAUNCH_ADJACENT | Intent.FLAG_ACTIVITY_NEW_TASK);
        ActivityOptions options = ActivityOptions.makeBasic().setLaunchDisplayId(1);
        startActivity(intent, options.toBundle());
    });

The Intent.FLAG_ACTIVITY_NEW_TASK is extremely important in order to have the new application launch on a different display. Otherwise it'll launch in the same task stack, on the same display.

That 'new application' needs to also have android:resizeableActivity="true" in the manifest. True is the default, but I specified to just be explicit and protect future framework changes.

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:resizeableActivity="true"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">

回答3:

each time you add a new simulate screen the display id changes. it resets to 1 when you restart. check if this is the issue. adb command that you specified doesnt seem to work as you said.

来源：https://stackoverflow.com/questions/42971442/android-o-launch-on-secondary-display