我有一个使用AlertDialog.Builder类创建的对话框，并调用builder.setView（int resource）为其提供文本输入的自定义布局。
当用户点击OK时，我正在尝试从布局上的EditTexts中检索值，但是当调用findViewByID（）时，我得到空引用。如果在调用setContentView（）之前尝试加载View，那么在它周围读取它似乎会发生在其他地方。使用Builder我显然没有这样做，有没有办法检索视图或者我应该以不同的方式构建我的对话框？
下面的Java和堆栈跟踪：
// Set up the on click of the Button
Button add = (Button) findViewById(R.id.manage_connections_add_button);
add.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View view) {
AlertDialog.Builder builder = new AlertDialog.Builder(ManageConnectedServicesActivity.this);
builder.setTitle("Add Service");
builder.setView(R.layout.component_sharing_service_dialogue);
// Set up the buttons on the dialog
builder.setPositiveButton("Add", new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialogInterface, int i) {
// Get the connected service url
EditText url = (EditText) findViewById(R.id.add_sharing_service_url); // This is the offending line
addConnectedService(url.getText().toString()); // Crashes here
}
});
builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialogInterface, int i) {
dialogInterface.cancel();
}
});
builder.show();
}
});
堆栈追踪：
12-05 09:54:40.825 1889-1889/uk.mrshll.matt.accountabilityscrapbook E/AndroidRuntime: FATAL EXCEPTION: main
Process: uk.mrshll.matt.accountabilityscrapbook, PID: 1889
java.lang.NullPointerException: Attempt to invoke virtual method 'android.text.Editable android.widget.EditText.getText()' on a null object reference
at uk.mrshll.matt.accountabilityscrapbook.ManageConnectedServicesActivity$1$1.onClick(ManageConnectedServicesActivity.java:63)
at android.support.v7.app.AlertController$ButtonHandler.handleMessage(AlertController.java:157)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5343)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:700)
答案 0 :(得分：2)
创建一个视图，其中膨胀xml文件，并在findViewById()
final View view = inflater.inflate(R.layout.schedule,null);
builder.setView(view);
final EditText edtSelectDate = (EditText) view.findViewById(R.id.edtSelectDate);
答案 1 :(得分：0)
检查此代码如何使用编辑文本来扩充自定义对话框。
AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);
LayoutInflater inflater = this.getLayoutInflater();
final View dialogView = inflater.inflate(R.layout.custom_dialog, null);
dialogBuilder.setView(dialogView);
final EditText edt = (EditText) dialogView.findViewById(R.id.edit1);
dialogBuilder.setTitle("Custom dialog");
dialogBuilder.setMessage("Enter text below");
dialogBuilder.setPositiveButton("Done", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
//do something with edt.getText().toString();
}
});
dialogBuilder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
//pass
}
});
AlertDialog b = dialogBuilder.create();
b.show();
希望这有帮助。快乐的编码。如果你找到有用的话，请回答答案
答案 2 :(得分：0)
myTv.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(context);
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
final View dialogView = inflater.inflate(R.layout.dialog_forgot_password, null);**
dialogBuilder.setCancelable(true);
final EditText mobileEt;
Button done;
mobileEt = (EditText) dialogView.findViewById(R.id.mobile_et);
done = (Button) dialogView.findViewById(R.id.done);
dialogBuilder.setView(dialogView);
final AlertDialog alertDialog = dialogBuilder.create();
alertDialog.show();
done.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mobileEt.getText().toString().isEmpty()) {
mobileEt.setError(getString(R.string.email_or_mobile));
} else {
alertDialog.dismiss();
hitdApi(mobileEt.getText().toString());
}
);
mobileEt .setText("Please fill the value");
});
}
});
}
答案 3 :(得分：0)
\r