如何创建覆盖窗口以显示Android 10上的所有应用程序

Question

嗨，我认识的其他人都尝试做类似的事情，但是我所能找到的只是古老的，在Android 10上似乎不适用于我。

我实际上想做的是一个看起来有点像某些自定义ROM开发选项中的“显示CPU统计信息”功能的叠加层。这就是我的意思：

。

我有一个内核应用程序，我想显示一个这样的覆盖图，其中显示了诸如cpu和gpu freqs之类的内核统计信息。 cpu和gpu频率的代码不是问题。

我实际上想知道如何创建覆盖图。这是到目前为止我在网上找到的教程尝试过的东西，但是我尝试的每个教程都遇到相同的错误：Unable to add window -- token null is not valid; is your activity running?

这是我在manifest.xml中使用的：

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />

这是我的片段，其中包含启用覆盖（HUD）服务的切换开关：

public class MainFragment9 extends Fragment {

    private static final String TAG = "MainFragment9";
    private Switch overandroidlaySwitch;

    @Nullable
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        View view = inflater.inflate(R.layout.main_fragment9, container, false);

        overlaySwitch = (Switch) view.findViewById(R.id.overlay_toggle);

//region HUD SWITCH
        overlaySwitch.setOnClickListener(new OnClickListener() {
            public void onClick(View view) {
                if (overlaySwitch.isChecked()) {
                    //Start the service
                    if(!isSystemAlertPermissionGranted(MainFragment9.this.getActivity())){
                        requestSystemAlertPermission(MainFragment9.this.getActivity(),1);
                    }
                    if (Build.VERSION.SDK_INT >= 26) {
                        MainFragment9.this.getActivity().getApplicationContext().startForegroundService(new Intent(MainFragment9.this.getActivity().getApplicationContext(), HUD.class));
                    } else {
                        MainFragment9.this.getActivity().startService(new Intent(MainFragment9.this.getActivity().getApplicationContext(), HUD.class));
                    }
                    newEditor.putBoolean("Overlay", true);
                    Toast.makeText(MainFragment9.this.getActivity() ,"NGK Overlay enabled!", Toast.LENGTH_SHORT).show();
                } else {
                    //Stop the service
                    MainFragment9.this.getContext().stopService(new Intent(getContext(), HUD.class));
                    newEditor.putBoolean("Overlay", false);
                    Toast.makeText(MainFragment9.this.getContext(), "NGK Overlay disabled", Toast.LENGTH_SHORT).show();
                }
                newEditor.apply();
            }
        });
//endregion

        return view;
    }
}

最后是我的HUD服务：

public class HUD extends Service{

    private View topLeftView;

    private Button overlayedButton;
    private WindowManager wm;

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();

        wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);

        topLeftView = new View(this);
        WindowManager.LayoutParams topLeftParams = new WindowManager.LayoutParams(WindowManager.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.TYPE_TOAST, WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY | WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL, PixelFormat.TRANSLUCENT);
        topLeftParams.gravity = Gravity.LEFT | Gravity.TOP;
        topLeftParams.x = 0;
        topLeftParams.y = 0;
        topLeftParams.width = 0;
        topLeftParams.height = 0;
        wm.addView(topLeftView, topLeftParams);                       //Crashes here...
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        if (overlayedButton != null) {
            wm.removeView(overlayedButton);
            wm.removeView(topLeftView);
            overlayedButton = null;
            topLeftView = null;
        }
    }
}

再次感谢您的帮助！

Answer 1

您是否像这样将服务添加到清单中？

<service android:name="com.xxx.xxx.HUD">
</service>
</application>

或者也许尝试WindowManager.LayoutParams.TYPE_PHONE（但我认为那只是针对较老的api的。）>