Android Marshmallow双屏（LCD+HDMI）分屏显示实现咨询

Hey Arun, let's get your setup working so you can play video on LCD and run your custom APK on HDMI. Here's a clear, actionable approach tailored to your TI board running Android Marshmallow:

1. 关闭镜像模式，启用扩展显示 #

First, you need to break the mirrored display setup. There are two ways to do this:

• UI操作: Go to Settings > Display, look for options like "Display mode" or "Mirror display", and switch it from "Mirror" to "Extended" or "Dual display independent".
• ADB命令（如果UI找不到选项）:
  • Check available displays first to confirm IDs:

    adb shell dumpsys display
    

    You'll see entries like Display 0: LCD and Display 1: HDMI (order might vary).
  • Disable mirroring:

    adb shell settings put global mirror_display 0
    

  • Set extended mode (if needed):

    adb shell settings put global display_mode 1
    

2. 方案一：修改自定义APK以指定显示输出 #

If you have access to the custom APK's source code, this is the most reliable method:

• In your APK's main Activity, add code to attach its window to the HDMI display (adjust display ID based on your dumpsys output):

  import android.hardware.display.DisplayManager;
  import android.view.Display;
  import android.view.WindowManager;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
  
      // Get DisplayManager and list of available displays
      DisplayManager displayManager = (DisplayManager) getSystemService(Context.DISPLAY_SERVICE);
      Display[] displays = displayManager.getDisplays();
  
      // Assume HDMI is Display 1 (verify with dumpsys display)
      Display hdmiDisplay = null;
      for (Display display : displays) {
          if (display.getName().contains("HDMI")) {
              hdmiDisplay = display;
              break;
          }
      }
  
      // Attach the app's window to HDMI display
      if (hdmiDisplay != null) {
          WindowManager.LayoutParams params = getWindow().getAttributes();
          params.displayId = hdmiDisplay.getDisplayId();
          getWindow().setAttributes(params);
      }
  }
  

• Your video player (either system default or a custom one) will run on the main display (LCD) by default, no extra changes needed.

3. 方案二：无需修改APK，用ADB强制指定显示输出 #

If you can't modify the custom APK, use ADB commands to launch it directly on the HDMI display:

• Step 1: Launch the custom APK on the target display (replace com.your.package/com.your.package.MainActivity with your APK's component, and 1 with your HDMI display ID):

  adb shell am start -n com.your.package/com.your.package.MainActivity --display 1
  

• Step 2: Launch your video player on the main display (LCD, display ID 0, optional if you're using the system player manually):

  adb shell am start -n com.android.videoplayer/com.android.videoplayer.VideoPlayerActivity --display 0
  

• If the APK is already running, you can move its window to HDMI:
  • Get the APK's window ID:

    adb shell dumpsys window windows | grep mCurrentFocus
    

    Extract the window ID (the number after Window{), then run:

    adb shell service call window 1 i32 <window_id> i32 <hdmi_display_id>
    

4. 验证与故障排除 #

• After setting up, run adb shell dumpsys display again to confirm each display has its own content.
• If the custom APK doesn't show up on HDMI, check:
  • The display ID is correct (you might have mixed up LCD and HDMI IDs).
  • Your TI board's Android Marshmallow build supports multi-display extension mode (most TI industrial boards do, but verify with TI's docs if needed).
  • For video playback, make sure the video player isn't set to mirror output in its own settings.

内容的提问来源于stack exchange，提问作者dasariarun