用的是RxJava,请教一个关于加载进度用dialog的问题 报错

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我是直接把dialog显示放在onSubscribe中,然后在onComplete或onError隐藏.但是我这样写不管哪一个界面dialog界面都是占满全屏,如何能够只让它显示在某个指定区域,如图是一个主界面,下面是四个切换按钮,想把dialog显示在红色区域内.
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public abstract class HttpCallback<T> implements Observer<BaseResponse<T>> { public static final String TAG = HttpCallback.class.getCanonicalName();

private WeakReference<Activity> mActivity;

private boolean mShow;
private boolean mCancelable = false;

private boolean hasError = true;
private AlertDialog mDialog;

public HttpCallback(Activity activity) {
    mActivity = new WeakReference<>(activity);
}

@Override
public void onSubscribe(Disposable d) {
    if (mShow) {
        showDialog();//默认不显示进度,需要显示重写onSubscribe方法,并showProgress为true
        Log.d(TAG, "onSubscribe: 1103显示进度圈");
    }else{
        Log.d(TAG, "onSubscribe: 1103不显示进度圈");
    }
}

@Override
public void onNext(BaseResponse<T> t) {
    int code = t.getCode();  // 0 失败,  1 成功 ,  -1 token过期跳转到登录界面

// int code=-1; if (code == RequestUrl.CODE_SUCCESS) { hasError = false; onSuccess(t.getData(), t.getMsg()); } else if (code == RequestUrl.CODE_TOKEN_EXPIRE) { toLogin();//token失效,跳转到登录界面 } else { ToastUtils.showMessage(t.getMsg()); onFailure(); } }

@Override
public void onError(Throwable e) {
    if (mDialog != null)
        mDialog.dismiss();
    if (e instanceof SocketTimeoutException) {
        // 连接超时
        onError(e, ErrorStatus.HTTP_TIMEOUT);
    } else if (e instanceof ConnectException || e instanceof UnknownHostException) {
        // 无网络
        onError(e, ErrorStatus.HTTP_UNCONNECTED);
    } else if (e instanceof HttpException) {
        // 网络异常

// onError(e, ErrorStatus.HTTP_EXCEPTION.setErrorCode(((HttpException) e).code())); onError(e, ErrorStatus.HTTP_EXCEPTION); } else if (e instanceof JsonSyntaxException || e instanceof JSONException) { // 数据异常 onError(e, ErrorStatus.DATA_EXCEPTION); } else { // 其他错误 onError(e, ErrorStatus.OTHER_EXCEPTION); } onFinish(hasError); }

private void onError(Throwable e, final ErrorStatus otherException) {
    if (e != null) {
        e.printStackTrace();
    }

    mActivity.get().runOnUiThread(new Runnable() {
        @Override
        public void run() {
            ToastUtils.showMessage(otherException.getErrorMessage(), Toast.LENGTH_SHORT);
        }
    });
}

@Override
public void onComplete() {
    if (mDialog != null)
        mDialog.dismiss();
    onFinish(hasError);
}

public abstract void onSuccess(T t, String msg);

//除了成功与token失效的情况走这里
public void onFailure() {

}

//token失效
public void onTokenExpired() {

}

public void onFinish(boolean hasError) {
}

protected void showProgress(boolean show) {
    mShow = show;
}

public void setCancelable(boolean cancelable) {
    mCancelable = cancelable;
}

private void showDialog() {
    mDialog = new AlertDialog.Builder(mActivity.get()).create();
    mDialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
    mDialog.setCancelable(false);
    mDialog.show();
    Window window = mDialog.getWindow();
    window.getDecorView().setPadding(0, 0, 0, 0);
    window.setGravity(Gravity.CENTER);
    window.setContentView(R.layout.loading);
    WindowManager.LayoutParams lp = window.getAttributes();
    lp.width = WindowManager.LayoutParams.FILL_PARENT;
    lp.height = WindowManager.LayoutParams.FILL_PARENT;
    window.setAttributes(lp);
}

private void toLogin() {

// ToastUtils.showLongMessage("登录状态已过期,请重新登录"); AlertDialog.Builder builder = new AlertDialog.Builder(mActivity.get()); builder.setTitle("温馨提示") .setMessage("登录状态已过期,请重新登录") .setCancelable(false) .setPositiveButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { UserManager.getInstance().logout();//清除保存数据 Intent loginIntent = new Intent(mActivity.get(), ThirdLoginActivity.class);//token失效,跳转到登录界面 loginIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); // loginIntent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP); mActivity.get().startActivity(loginIntent); } }).show(); } }