Question

我有一个活动，我想要显示ProgressDialog。我在我的Activity中重写了onCreateDialog。每次对话框在onCreateDialog中返回时，我都会强制关闭，说：

07-13 13:10:11.449: ERROR/AndroidRuntime(8720): android.util.AndroidRuntimeException:     requestFeature() must be called before adding content
07-13 13:10:11.449: ERROR/AndroidRuntime(8720):     at com.android.internal.policy.impl.PhoneWindow.requestFeature(PhoneWindow.java:181)
07-13 13:10:11.449: ERROR/AndroidRuntime(8720):     at com.android.internal.app.AlertController.installContent(AlertController.java:199)
07-13 13:10:11.449: ERROR/AndroidRuntime(8720):     at android.app.AlertDialog.onCreate(AlertDialog.java:251)
07-13 13:10:11.449: ERROR/AndroidRuntime(8720):     at android.app.ProgressDialog.onCreate(ProgressDialog.java:176)
07-13 13:10:11.449: ERROR/AndroidRuntime(8720):     at android.app.Dialog.dispatchOnCreate(Dialog.java:307)
07-13 13:10:11.449: ERROR/AndroidRuntime(8720):     at android.app.Activity.createDialog(Activity.java:886)
07-13 13:10:11.449: ERROR/AndroidRuntime(8720):     at android.app.Activity.showDialog(Activity.java:2557)
07-13 13:10:11.449: ERROR/AndroidRuntime(8720):     at     android.app.Activity.showDialog(Activity.java:2524)

onCreateDialog（int id）如下所示：

    protected Dialog onCreateDialog(int id){
    switch (id) {
    case DOWNLOAD_DIALOG:
        ProgressDialog dialog = new ProgressDialog(ListMapActivity.this);
        dialog.setTitle(getResources().getString(R.string.dialog_download_title));
        dialog.setCancelable(true);
        dialog.setOnCancelListener(new OnCancelListener() {

            @Override
            public void onCancel(DialogInterface dialog) {
                if ((mTask.getStatus().equals(AsyncTask.Status.RUNNING) 
                    || mTask.getStatus().equals(AsyncTask.Status.PENDING)) 
                    && !mTask.isCancelled()){
                    mTask.cancel(true);
                }
                Toast.makeText(getApplicationContext(), R.string.dialog_download_cancel, Toast.LENGTH_LONG).show();
            }
        });         
        TextView tw = new TextView(ListMapActivity.this);
        dialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
        LayoutParams params = new ViewGroup.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT);
        tw.setLayoutParams(params);
        tw.setText(getResources().getString(R.string.dialog_download_text));
        dialog.setContentView(tw);


        return dialog;

    default:
        return null;
    }
}

注意：我尝试直接执行ProgressDialog.Show（context，title，message）而不是showDialog（），结果如下：

07-13 13:03:42.910: ERROR/AndroidRuntime(8444): android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
07-13 13:03:42.910: ERROR/AndroidRuntime(8444):     at android.view.ViewRoot.setView(ViewRoot.java:531)
07-13 13:03:42.910: ERROR/AndroidRuntime(8444):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177)
07-13 13:03:42.910: ERROR/AndroidRuntime(8444):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
07-13 13:03:42.910: ERROR/AndroidRuntime(8444):     at android.app.Dialog.show(Dialog.java:241)
07-13 13:03:42.910: ERROR/AndroidRuntime(8444):     at android.app.ProgressDialog.show(ProgressDialog.java:107)
07-13 13:03:42.910: ERROR/AndroidRuntime(8444):     at android.app.ProgressDialog.show(ProgressDialog.java:90)
07-13 13:03:42.910: ERROR/AndroidRuntime(8444):     at android.app.ProgressDialog.show(ProgressDialog.java:85)

我认为我忘了要初始化的东西。我甚至不知道这个requestFeature（）的调用位置。欢迎任何想法

更新：我玩了一下，发现，一切都有效，如果我删除这些行：

        LayoutParams params = new ViewGroup.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT);
        tw.setLayoutParams(params);
        tw.setText(getResources().getString(R.string.dialog_download_text));
        dialog.setContentView(tw);

所以我迷失了如何设置此视图的内容。当我在我的Activity的onCreate中创建Main-design作为成员并将其放入ProgressDialog时，它没有帮助。我根本没有遇到问题。将TextView即时放入我的Dialog的内容有什么不对？

Answer 1

试试吧。

ProgressDialog dialog = ProgressDialog.show(yourActivity.this, "", 
                        "Loading. Please wait...", true);

感谢。

Answer 2

此错误消息requestFeature() must be called before adding content表示您正在调用对话框中的方法，在添加内容后不允许您调用该方法。

我会移动这些行：

dialog.setCancelable(true);
dialog.setTitle(getResources().getString(R.string.dialog_download_title));

这样他们就在这一行之前：

dialog.setContentView(tw);

setTitle是你最有可能的错误候选人。

Android显示ProgressDialog时出现错误

2 个答案: