java - 如何创建虚拟 View 以 anchor 定弹出窗口android

我有以下情况：

private void startConnection() {
    HashMap<String,String> hm = new HashMap<String,String>();
    hm.put("email","[email protected]");
    String URL = "192.168.1.2/test.php";
    Db_connection db = new Db_connection(hm,URL,context);
    db.startTest();
}

public class Db_connection {

    private HashMap<String, String> params;
    private String URL;
    private ConnectionController CC;
    private ToolTip tt;
    private Context con;
    private ProgressDialog dialog;

    public Db_connection(HashMap<String,String> params,String URL,Context con) {
        this.params = params;
        this.URL = URL;
        this.con = con;
        this.dialog = new ProgressDialog(con);
        this.dialog.setCancelable(true);
        this.CC = ConnectionController.getInstance();
    }

    public void startTest() {
        JsonObjectRequest req = new JsonObjectRequest(URL, new JSONObject(params),
                new Response.Listener<JSONObject>() {
            @Override
            public void onResponse(JSONObject response) {
                if (dialog.isShowing()) { dialog.dismiss(); }

                if (response != null && response.has("result")) {
                    try {
                        if (!response.getString("result").matches("error")) {
                            Toast.makeText(con, "Response: "+response.getString("result"), Toast.LENGTH_LONG).show();
                        }
                        else { Toast.makeText(con, response.getString("errmsg"), Toast.LENGTH_LONG).show(); return; }

                        VolleyLog.v("Response:%n %s", response.toString(4));
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
                }
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                ToolTip tt = new ToolTip(con, error.getMessage());
                tt.showNow();
                Log.e("Error: ", error.getMessage());
            }
        });
        req.setRetryPolicy(rp);
        CC.addToRequestQueue(req);
    }
}

public class ToolTip {

private Context con;
private PopupWindow pn;
private View layout;
private ImageView cancel;
private TextView mess;

public ToolTip(Context con,String htmlMsg) {
    this.con = con;
    LayoutInflater inflater = (LayoutInflater)con.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    layout = inflater.inflate(R.layout.tooltip,null);
    pn = new PopupWindow(layout,LayoutParams.MATCH_PARENT,LayoutParams.WRAP_CONTENT,false);
    pn.setAnimationStyle(R.style.AnimationToolTip);
    cancel = (ImageView)layout.findViewById(R.id.tooltip_imageClose);
    mess = (TextView)layout.findViewById(R.id.tooltip_mainText);
        mess.setText(Html.fromHtml(htmlMsg));

        cancel.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                pn.dismiss();
        }
        });
    }

    public void showNow() {
        pn.showAtLocation(/*HERE IS WHERE I DON'T KNOW WHAT TO PASS AS VIEW*/((Activity) con).getActionBar().getCustomView(), Gravity.NO_GRAVITY, 0, 180);
    }
}

一切正常，但是当截击请求引发错误并使用ToolTip类显示错误时：

ToolTip tt = new ToolTip(con, error.getMessage());
tt.showNow();

我得到这个例外：

11-21 15:08:06.390: E/AndroidRuntime(22448): Process: com.tooltip.test, PID: 22448
11-21 15:08:06.390: E/AndroidRuntime(22448): java.lang.ClassCastException: com.tooltip.test.ConnectionController cannot be cast to android.app.Activity
11-21 15:08:06.390: E/AndroidRuntime(22448):    at com.tooltip.test.ToolTip.showNow(ToolTip.java:46)
11-21 15:08:06.390: E/AndroidRuntime(22448):    at com.tooltip.test.Db_connection$2.onErrorResponse(Db_connection.java:100)
11-21 15:08:06.390: E/AndroidRuntime(22448):    at com.android.volley.Request.deliverError(Request.java:577)
11-21 15:08:06.390: E/AndroidRuntime(22448):    at com.android.volley.ExecutorDelivery$ResponseDeliveryRunnable.run(ExecutorDelivery.java:101)
11-21 15:08:06.390: E/AndroidRuntime(22448):    at android.os.Handler.handleCallback(Handler.java:733)
11-21 15:08:06.390: E/AndroidRuntime(22448):    at android.os.Handler.dispatchMessage(Handler.java:95)
11-21 15:08:06.390: E/AndroidRuntime(22448):    at android.os.Looper.loop(Looper.java:136)
11-21 15:08:06.390: E/AndroidRuntime(22448):    at android.app.ActivityThread.main(ActivityThread.java:5139)
11-21 15:08:06.390: E/AndroidRuntime(22448):    at java.lang.reflect.Method.invokeNative(Native Method)
11-21 15:08:06.390: E/AndroidRuntime(22448):    at java.lang.reflect.Method.invoke(Method.java:515)
11-21 15:08:06.390: E/AndroidRuntime(22448):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:796)
11-21 15:08:06.390: E/AndroidRuntime(22448):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:612)
11-21 15:08:06.390: E/AndroidRuntime(22448):    at dalvik.system.NativeStart.main(Native Method)

通常我会通过：

((Activity) con).getActionBar().getCustomView()

作为锚定弹出窗口并对其起作用的视图，但是在这种特殊情况下，调用工具提示类的活动没有操作栏（这是唯一的，其他所有活动都具有自定义操作栏）。

我在这里问是否有一种方法可以使用虚拟的，以编程方式创建的视图在这种情况下使用。

或者也许我做错了，你有一个很好的建议:)

提前致谢

最佳答案

经过一番尝试，我终于找到了解决方案：我选择使用两种不同的方法，一种用于带动作栏的活动，一种用于不带动作栏的活动：

public void showNow() { //THIS IS FOR ACTIVITY WITH ACTION BAR
    pn.showAtLocation((Activity)con.getActionBar().getCustomView(), Gravity.NO_GRAVITY, 0, 180);
}

public void showNowNoActBar() { //THIS IS FOR ACTIVITY WITHOUT ACTION BAR
    pn.showAtLocation(con.findViewById(R.id.dummy_hidden_view), Gravity.NO_GRAVITY, 0, 180);
}

显然R.id.dummy_hidden_view是在活动的XML布局中定义的，而没有这样的自定义操作栏：

<TextView
    android:id="@+id/dummy_hidden_view"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:visibility="gone" />

我认为这两种方法都只能用一种方法解决，但到目前为止，我可以依靠我的“双重方法”解决方案来满足需要。希望它可以帮助别人。仍然存在这样一个事实，我将对如何处理此问题提出任何更好的建议。