Question

我有服务点设备该设备具有双屏

当目标api小于22时，只有得到您的许可，它才能起作用。但是当目标api为22或更高时会出现问题问题是此窗口类型的权限被拒绝

public class MainActivity extends AppCompatActivity {
   Context context;
   DisplayManager mDisplayManager;
   DifferentDisplay mPresentation;
   DifferentDisplay2 mPresentation2;
   Display[]  displays;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    context = getApplicationContext();

    if (ContextCompat.checkSelfPermission(this, Manifest.permission.SYSTEM_ALERT_WINDOW) == PackageManager.PERMISSION_GRANTED){

    } else{
        //this is not working
        ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.SYSTEM_ALERT_WINDOW},0);
    }


    mDisplayManager =(DisplayManager)context.getSystemService(Context.DISPLAY_SERVICE);
    displays = mDisplayManager.getDisplays();

    mPresentation = new DifferentDisplay(context,displays[1]);//displays[1] is the customer display)
    mPresentation.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
    mPresentation.show();

    Button button = findViewById(R.id.button1);
    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            mPresentation2 = new DifferentDisplay2(context,displays[1]);//displays[1] is the customer display)
            mPresentation2.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
            mPresentation2.show();


        }
    });

}
}

这是我的日志

04-01 09：55：18.042 16389-16389 / com.example.dualscreen E / AndroidRuntime：FATAL EXCEPTION：main 程序：com.example.dualscreen，PID：16389 java.lang.RuntimeException：无法启动活动ComponentInfo {com.example.dualscreen / com.example.dualscreen.MainActivity}：android.view.WindowManager $ BadTokenException：无法添加窗口android.view.ViewRootImpl$W@f70b45a-此窗口类型的权限被拒绝在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2421）在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2481）在android.app.ActivityThread.-wrap11（ActivityThread.java）在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1346）在android.os.Handler.dispatchMessage（Handler.java:102）在android.os.Looper.loop（Looper.java:148）在android.app.ActivityThread.main（ActivityThread.java:5425）在java.lang.reflect.Method.invoke（本机方法）在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:772）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:662）原因：android.view.WindowManager $ BadTokenException：无法添加窗口android.view.ViewRootImpl$W@f70b45a-此窗口类型的权限被拒绝在android.view.ViewRootImpl.setView（ViewRootImpl.java:591）在android.view.WindowManagerGlobal.addView（WindowManagerGlobal.java:310）在android.view.WindowManagerImpl.addView（WindowManagerImpl.java:85）在android.app.Dialog.show（Dialog.java:319）在android.app.Presentation.show（Presentation.java:235）在com.example.dualscreen.MainActivity.onCreate（MainActivity.java:39）在android.app.Activity.performCreate（Activity.java:6266）在android.app.Instrumentation.callActivityOnCreate（Instrumentation.java:1107）在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2374）在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2481）在android.app.ActivityThread.-wrap11（ActivityThread.java）在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1346）在android.os.Handler.dispatchMessage（Handler.java:102）在android.os.Looper.loop（Looper.java:148）在android.app.ActivityThread.main（ActivityThread.java:5425）在java.lang.reflect.Method.invoke（本机方法）在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:772）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:662）

Answer 1

 mPresentation.getWindow().setType(WindowManager.LayoutParams.TYPE_TOAST);

这样，您不需要权限。但是

mPresentation.getWindow().setType(WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY);

使用它仍然会引起问题谁有更好的解决方案？

真正的android双重显示权限问题

1 个答案: