我已经使用自定义对话框和界面创建了一个对话框,以及将单击事件传递回对话框主机(MainActivity)的自定义布局。但是,我的问题是,当我尝试将文本输入对话框中的EditText中时,它会以一个空字符串返回。有任何想法吗?我可以从对话框中的文本视图中获取文本,而不是EditText。
add_class_dialog.xml:
<?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>
mainActivity.java:
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.editClassCredits);
}
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();
}
}
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();
}
}
获得文本视图的值的原因是因为您已经在布局中对其进行了硬编码。android:text="Class: "
您的代码有几件事。如果布局是用于对话框的,那么您不应在活动中充气。这是您要实施它的方法。您无需在活动中夸大布局。布局应在对话框中夸大,并且活动不知道布局的拥有或做什么。无论活动需要什么都需要知道应该通过回调。
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();
}
}
对话范围将通过您在此处声明的接口来定义需要返回活动的内容。我已经将其更改为进行文本视图和递观。您可以根据需要更改它。
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();
}
}
您只是为您的Edittext转介错误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();
}
}