Android 可以从对话框文本视图中获取文本,但无法从对话框编辑文本中获取文本
我使用自定义的DialogFragment和接口以及自定义布局创建了一个对话框,该布局将单击事件传递回对话框主机(MainActivity)。然而,我的问题是,当我试图获取对话框中EditText中输入的文本时,它返回为空字符串。有什么想法吗?我能够从对话框中的文本视图中获取文本,而不是编辑文本 添加\u class\u dialog.xml:Android 可以从对话框文本视图中获取文本,但无法从对话框编辑文本中获取文本,android,android-fragments,dialog,Android,Android Fragments,Dialog,我使用自定义的DialogFragment和接口以及自定义布局创建了一个对话框,该布局将单击事件传递回对话框主机(MainActivity)。然而,我的问题是,当我试图获取对话框中EditText中输入的文本时,它返回为空字符串。有什么想法吗?我能够从对话框中的文本视图中获取文本,而不是编辑文本 添加\u class\u dialog.xml: <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android=
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dp">
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center">
<TextView
android:id="@+id/viewClassName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Class: "
android:textSize="25sp"
android:textColor="@color/textColor"/>
<EditText
android:id="@+id/editClassName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:hint="Enter class"
android:textSize="25sp"
android:textColor="@color/textColor"
android:layout_gravity="center"/>
</LinearLayout>
</LinearLayout>
AddClassDialogFragment.java:
public class AddClassDialogFragment extends DialogFragment {
public interface AddClassDialogListener {
void onDialogPositiveClick(DialogFragment dialog);
void onDialogNegativeClick(DialogFragment dialog);
}
AddClassDialogListener mListener;
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mListener = (AddClassDialogListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString() + " must implement NoticeDialogListener");
}
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
final LayoutInflater inflater = getActivity().getLayoutInflater();
builder.setView(inflater.inflate(R.layout.add_class_dialog, null));
builder.setPositiveButton("Add", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
mListener.onDialogPositiveClick(AddClassDialogFragment.this);
}
});
builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
mListener.onDialogNegativeClick(AddClassDialogFragment.this);
}
});
return builder.create();
}
}
您刚才为您的编辑文本引用了错误的id
public class MainActivity extends FragmentActivity implements AddClassDialogFragment.AddClassDialogListener {
TextView nameView;
EditText editName;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
View vi = getLayoutInflater().inflate(R.layout.add_class_dialog, null);
nameView = vi.findViewById(R.id.viewClassName);
editName = vi.findViewById(R.id.editClassName);
}
public void addClass(View view) {
AddClassDialogFragment acdf = new AddClassDialogFragment();
acdf.show(getFragmentManager(), "ac");
}
@Override
public void onDialogPositiveClick(DialogFragment dialog) {
Toast.makeText(this, nameView.getText().toString(), Toast.LENGTH_SHORT).show();
Toast.makeText(this, editName.getText().toString(), Toast.LENGTH_SHORT).show();
}
@Override
public void onDialogNegativeClick(DialogFragment dialog) {
Toast.makeText(this, "Cancel", Toast.LENGTH_SHORT).show();
}
}
获取TextView值的原因是您在布局中对其进行了硬编码
android:text=“Class:”
您的代码有几处错误。如果布局是针对对话框的,则不应在“活动”中对其进行膨胀。下面是您希望如何实现它。
您不需要在活动中展开布局。布局应该在对话框中膨胀,活动应该不知道该布局有什么或做什么。无论活动需要知道什么,都应该通过回调进行
package com.soulpatch.stackoverflow;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends FragmentActivity implements AddClassDialogFragment.AddClassDialogListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final AddClassDialogFragment acdf = new AddClassDialogFragment();
acdf.show(getSupportFragmentManager(), "abc");
}
@Override
public void onDialogPositiveClick(TextView textView, EditText editText) {
Toast.makeText(this, textView.getText(), Toast.LENGTH_SHORT).show();
Toast.makeText(this, editText.getText() == null ? "" : editText.getText().toString(), Toast.LENGTH_SHORT).show();
}
@Override
public void onDialogNegativeClick(TextView textView, EditText editText) {
Toast.makeText(this, textView.getText(), Toast.LENGTH_SHORT).show();
Toast.makeText(this, editText.getText() == null ? "" : editText.getText().toString(), Toast.LENGTH_SHORT).show();
}
}
DialogFragment将定义需要通过此处声明的接口返回活动的内容。我已将其更改为采用文本视图和编辑文本。您可以根据您的要求进行更改
package com.soulpatch.stackoverflow;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.view.LayoutInflater;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;
public class AddClassDialogFragment extends DialogFragment {
public interface AddClassDialogListener {
void onDialogPositiveClick(TextView textView, EditText editText);
void onDialogNegativeClick(TextView textView, EditText editText);
}
AddClassDialogListener mListener;
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mListener = (AddClassDialogListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString() + " must implement NoticeDialogListener");
}
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
final LayoutInflater inflater = getActivity().getLayoutInflater();
final LinearLayout linearLayout = (LinearLayout) inflater.inflate(R.layout.add_class_dialog, null);
final TextView textView = linearLayout.findViewById(R.id.viewClassName);
final EditText editText = linearLayout.findViewById(R.id.editClassName);
builder.setView(linearLayout);
builder.setPositiveButton("Add", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
mListener.onDialogPositiveClick(textView, editText);
}
});
builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
mListener.onDialogNegativeClick(textView, editText);
}
});
return builder.create();
}
}
您引用了错误的id,应该使用此editClassName,而FindViewById通过更改以下行解决了此问题:builder.setView(充气器.inflate(R.layout.add_class_dialog,null));至:查看对话框视图=充气机。充气(R.layout.add_class_对话框,空);builder.setView(dialogView);然后,我可以使用以下声明访问edittext数据:final-edittext-editClassName=dialogView.findViewById(R.id.editNameD);并将getText()值作为参数放入onDialogPositiveClick方法中。
package com.soulpatch.stackoverflow;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.view.LayoutInflater;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;
public class AddClassDialogFragment extends DialogFragment {
public interface AddClassDialogListener {
void onDialogPositiveClick(TextView textView, EditText editText);
void onDialogNegativeClick(TextView textView, EditText editText);
}
AddClassDialogListener mListener;
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mListener = (AddClassDialogListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString() + " must implement NoticeDialogListener");
}
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
final LayoutInflater inflater = getActivity().getLayoutInflater();
final LinearLayout linearLayout = (LinearLayout) inflater.inflate(R.layout.add_class_dialog, null);
final TextView textView = linearLayout.findViewById(R.id.viewClassName);
final EditText editText = linearLayout.findViewById(R.id.editClassName);
builder.setView(linearLayout);
builder.setPositiveButton("Add", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
mListener.onDialogPositiveClick(textView, editText);
}
});
builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
mListener.onDialogNegativeClick(textView, editText);
}
});
return builder.create();
}
}