在Android中，InputMethodService class有沒有辦法監聽網絡變化？

Question

我在 Android 中創建了一個自定義鍵盤，每當彈出鍵盤時，我想在網絡連接中斷時顯示彈出窗口，我已經在基於活動的類中嘗試過，但這是一個不同的場景，因為它是一個服務 class。

但是當它開始運行時，鍵盤崩潰並收到此錯誤消息

錯誤

Caused by: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not valid; is your activity running?
                    at android.view.ViewRootImpl.setView(ViewRootImpl.java:1159)
                    at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:399)
                    at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:133)
                    at android.app.Dialog.show(Dialog.java:345)
                    at com.prasath.openaikeyboard.util.NetworkChangeListener.onReceive(NetworkChangeListener.java:25)
                    at android.app.LoadedApk$ReceiverDispatcher$Args.lambda$getRunnable$0$LoadedApk$ReceiverDispatcher$Args(LoadedApk.java:1679)

提前致謝

輸入法服務 class

public class MyInputMethodService  extends InputMethodService implements KeyboardView.OnKeyboardActionListener {
    private static final String TAG = "MyInputMethodService";
    private NetworkChangeListener networkChangeListener=new NetworkChangeListener();

    @Override
    public View onCreateInputView() {
        KeyboardView keyboardView=(KeyboardView) getLayoutInflater().inflate(R.layout.keyboard_view,null);
        Keyboard keyboard=new Keyboard(this,R.xml.numberpad);
        keyboardView.setKeyboard(keyboard);
        keyboardView.setOnKeyboardActionListener(this);
        networkChangeListener=new NetworkChangeListener();
        return keyboardView;

    }

NetworkChangeListener class

public class NetworkChangeListener extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        if(!Common.isConnectedToInternet(context)){
            AlertDialog.Builder builder=new AlertDialog.Builder(context);
            View view= LayoutInflater.from(context).inflate(R.layout.check_internet_dialog,null);
            builder.setView(view);

            Button button=view.findViewById(R.id.btnrefreshid);

            AlertDialog alertDialog=builder.create();
            alertDialog.show();
            alertDialog.setCancelable(false);

            alertDialog.getWindow().setGravity(Gravity.CENTER);

            button.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    alertDialog.dismiss();
                    onReceive(context,intent);
                }
            });
        }
    }
}

Answer 1

Dialog及其子類型，如AlertDialog ，只能在Activity中使用，而不能在Context的其他 forms 中使用。

任何一個：

• 直接在鍵盤用戶界面中顯示您的消息，或者
• 開始一項活動，也許是使用對話主題的活動，以顯示您的信息