Android：如何创建没有标题的对话框？ [英] Android: How to create a Dialog without a title?

问题描述

我试图在Android中生成一个自定义对话框。
我创建如下对话框：

  dialog = new Dialog（this）; 
 dialog.setContentView（R.layout.my_dialog）; 
  

除了对话框的标题之外，Everythings工作正常。
即使我没有设置对话框的标题，对话框弹出窗口在对话框的位置有空格。

有没有办法隐藏对话框的这部分？

我尝试使用AlertDialog，但似乎布局设置不正确：

  LayoutInflater inflater = 
（LayoutInflater）this.getSystemService（Context.LAYOUT_INFLATER_SERVICE）; 
查看视图= inflater.inflate（R.layout.map_dialog，null）; 
 
 AlertDialog.Builder builder = new AlertDialog.Builder（this）; 
 builder.setView（view）; 
 
 // dialog = new Dialog（this）; 
 // dialog.setContentView（R.layout.map_dialog）; 
 
 dialog = builder.create（）; 
 
（（TextView）dialog.findViewById（R.id.nr））。setText（number）; 
  

如果我使用这个代码，我在最后一行得到一个空指针异常。对话框不为null，所以我尝试检索的TextView不存在。

如果我取消注释我使用Dialog构造函数的部分，一切都可以正常工作，但是在我的对话框布局之上。

解决方案

您可以使用以下方式隐藏对话框的标题：

dialog.requestWindowFeature（Window.FEATURE_NO_TITLE）;

---

此答案的上一个版本，这是过于复杂的：

您需要使用 AlertDialog 。有关自定义对话框的Android开发人员网站有一个很好的解释。

在简短的总结中，您可以从官方网站下面的代码复制下面的代码。这需要一个自定义的layot文件，充气它，给它一些基本的文本和图标，然后创建它。你会用 alertDialog.show（）显示它。

  AlertDialogBu​​ilder构建器
 AlertDialog alertDialog; 
 
上下文mContext = getApplicationContext（）; 
 LayoutInflater inflater =（LayoutInflater）
 mContext.getSystemService（LAYOUT_INFLATER_SERVICE）; 
查看layout = inflater.inflate（R.layout.custom_dialog，
（ViewGroup）findViewById（R.id.layout_root））; 
 
 TextView text =（TextView）layout.findViewById（R.id.text）; 
 text.setText（你好，这是一个自定义对话框！）; 
 ImageView image =（ImageView）layout.findViewById（R.id.image）; 
 image.setImageResource（R.drawable.android）; 
 
 builder = new AlertDialog.Builder（mContext）; 
 builder.setView（layout）; 
 alertDialog = builder.create（）; 
  

回应评论：

我假设具有id nr 的TextView在视图中正在膨胀， View view = inflater .... 。如果是这样，那么你需要改变一点：而不是 dialog.findView ... 使它 view.findView ... 。那么一旦你这样做，记得使用dialog.show（），甚至builder.show（），而不用去做builder.create（）。

I'm trying to generate a custom dialog in Android. I create my Dialog like this:

dialog = new Dialog(this);
dialog.setContentView(R.layout.my_dialog);

Everythings works fine except for the title of the Dialog. Even if I don't set the title of the dialog the dialog popup has a blank space at the position of the dialog.

Is there any way to hide this part of the Dialog?

I tried it with an AlertDialog but it seems the layout is not set properly:

LayoutInflater inflater = 
    (LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.map_dialog, null);

AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setView(view);

// dialog = new Dialog(this);
// dialog.setContentView(R.layout.map_dialog);

dialog = builder.create();

((TextView) dialog.findViewById(R.id.nr)).setText(number);

If I use this code I get a null Pointer Exception in the last line. The dialog is not null so the TextView I try to retrieve does not exist.
If I uncomment the part where I use the Dialog Constructor everything works fine but for the title above my dialog layout.

解决方案

You can hide the title of a dialog using:

dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);

---

Previous version of this answer, which is overcomplicated:

You need to use an AlertDialog. There's a good explanation on the Android Developer's site about custom dialogs.

In very short summary, you do this with code like copied below from the official website. That takes a custom layot file, inflates it, gives it some basic text and icon, then creates it. You'd show it then with alertDialog.show().

AlertDialog.Builder builder;
AlertDialog alertDialog;

Context mContext = getApplicationContext();
LayoutInflater inflater = (LayoutInflater)
        mContext.getSystemService(LAYOUT_INFLATER_SERVICE);
View layout = inflater.inflate(R.layout.custom_dialog,
        (ViewGroup) findViewById(R.id.layout_root));

TextView text = (TextView) layout.findViewById(R.id.text);
text.setText("Hello, this is a custom dialog!");
ImageView image = (ImageView) layout.findViewById(R.id.image);
image.setImageResource(R.drawable.android);

builder = new AlertDialog.Builder(mContext);
builder.setView(layout);
alertDialog = builder.create();

In response to comment:

I assume that TextView with the id nr is in the View you are inflating with View view = inflater..... If so, then you need to change just one bit: instead of dialog.findView... make it view.findView.... Then once you've done that, remember to use dialog.show(), or even builder.show() without bothering to do builder.create().

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