[英]Handling buttons in custom dialogs
I have a little problem with an android custom dialog. 我有一个Android自定义对话框的问题。
I construct a custom dialog in the onCreateDialog(int) function: 我在onCreateDialog(int)函数中构造了一个自定义对话框:
dialog = new Dialog(this);
dialog.setContentView(R.layout.custom_dialog);
dialog.setTitle("Custom Dialog");
I have a onClick(View) function in the same class: 我在同一个类中有一个onClick(View)函数:
public void onClick(View v) {
switch(v.getId()) {
case R.id.dialog_button:
Log.i("pma57","dialog button pressed");
break;
case R.id.main_button:
showDialog(DIALOG_CUSTOM);
break;
}
}
This is the XML definition: 这是XML定义:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:paddingLeft="20dp"
android:paddingRight="20dp"
android:paddingBottom="20dp">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/enter_username" />
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<Button
android:id="@+id/dialog_button"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="OK"
android:onClick="onClick" />
</LinearLayout>
The Dialog shows up. 对话框显示出来。 But the Button does not work (the app crashs)- which is quite ok because the onClick-function for the callback is defined in my main activity - and the dialog is a new activity (am I right?).
但是Button不起作用(应用程序崩溃) - 这很好,因为回调的onClick函数是在我的主要活动中定义的 - 对话框是一个新活动(我是对的吗?)。
But I realy don't know how i implement a button in the dialog - I think this is a fundamental understanding problem of the technic. 但我真的不知道如何在对话框中实现一个按钮 - 我认为这是技术的基本理解问题。 The long way would be to subclass Dialog and write everything there - but is there another way which I don't see?
很长的路要是继承Dialog并在那里写下所有东西 - 但还有另一种我看不到的方法吗?
The way round it that I use, rather than having a switch block is to use onClickListeners for the buttons: 我使用它的方式,而不是有一个开关块是使用onClickListeners为按钮:
dialog = new Dialog(this);
dialog.setContentView(R.layout.custom_dialog);
dialog.setTitle("Custom Dialog");
Button dialog_btn = (Button) dialog.findViewById(R.id.dialog_button);
dialog_btn.setOnClickListener(new View.OnClickListener()
{
// Perform button logic
}
Note that you are finding the view from the dialog, not just calling straight to findViewById as that would return a null pointer as there would be not dialog_button on the application view. 请注意,您正在从对话框中查找视图,而不是直接调用findViewById,因为它将返回空指针,因为应用程序视图上不会有dialog_button。
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