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我想创建用于输入文本和日期的自定义对话框。对于我创建了一个布局的XML文件，该文件是Android对话框警报
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" android:orientation="vertical">
<EditText android:id="@+id/dialogEditText" android:text="Enter Your Text Here" android:layout_height="wrap_content" android:layout_width="match_parent"></EditText>
<DatePicker android:id="@+id/datPicker" android:layout_height="wrap_content" android:layout_width="match_parent" ></DatePicker>
<LinearLayout android:id="@+id/linearLayout1" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal">
<Button android:text="Add" android:id="@+id/dialogAddBtn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true"></Button>
<Button android:text="Cancel" android:id="@+id/dialogCancelBtn" android:layout_width="200px" android:layout_height="wrap_content" android:layout_centerHorizontal="true"></Button>
</LinearLayout>
</LinearLayout>
和我的类代码：
final Dialog d= new Dialog(obj);
Window window= d.getWindow();
window.setFlags(WindowManager.LayoutParams.FLAG_BLUR_BEHIND, WindowManager.LayoutParams.FLAG_BLUR_BEHIND);
window.setTitle("Add Item");
window.setContentView(R.layout.dialog_view);
final EditText input= (EditText) obj.findViewById(R.id.dialogEditText);
Button okBtn= (Button) obj.findViewById(R.id.dialogAddBtn);
okBtn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
toDoItems.add(0,input.getText().toString());
aa.notifyDataSetChanged();
//d.dismiss();
}
});
d.show();
这是完美呈现对话框，但是当我在单击确定比它产生的例外是：
04-06 14:01:24.415: ERROR/AndroidRuntime(1189): FATAL EXCEPTION: main
04-06 14:01:24.415: ERROR/AndroidRuntime(1189): java.lang.NullPointerException
04-06 14:01:24.415: ERROR/AndroidRuntime(1189): at com.example.wrox.MyDialog.showInputDialog(MyDialog.java:66)
04-06 14:01:24.415: ERROR/AndroidRuntime(1189): at com.example.wrox.ToDoItems$1.onClick(ToDoItems.java:69)
04-06 14:01:24.415: ERROR/AndroidRuntime(1189): at android.view.View.performClick(View.java:2485)
04-06 14:01:24.415: ERROR/AndroidRuntime(1189): at android.view.View$PerformClick.run(View.java:9080)
04-06 14:01:24.415: ERROR/AndroidRuntime(1189): at android.os.Handler.handleCallback(Handler.java:587)
04-06 14:01:24.415: ERROR/AndroidRuntime(1189): at android.os.Handler.dispatchMessage(Handler.java:92)
04-06 14:01:24.415: ERROR/AndroidRuntime(1189): at android.os.Looper.loop(Looper.java:123)
04-06 14:01:24.415: ERROR/AndroidRuntime(1189): at android.app.ActivityThread.main(ActivityThread.java:3683)
04-06 14:01:24.415: ERROR/AndroidRuntime(1189): at java.lang.reflect.Method.invokeNative(Native Method)
04-06 14:01:24.415: ERROR/AndroidRuntime(1189): at java.lang.reflect.Method.invoke(Method.java:507)
04-06 14:01:24.415: ERROR/AndroidRuntime(1189): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
04-06 14:01:24.415: ERROR/AndroidRuntime(1189): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
04-06 14:01:24.415: ERROR/AndroidRuntime(1189): at dalvik.system.NativeStart.main(Native Method)
请建议我一些解决方案.......
MyDialog.java上的内容：66 – 2011-04-06 08:42:50