[英]Android App crashes when I try to capture from EditText
因此,我正在尝试从菜单选项中打开的“警报对话”框中创建联系表。 我的表单中有3个EditText字段,在Main.java中,当按下表单中的“发送”按钮时,我从这些字段中读取内容,然后启动电子邮件意图,或者至少就是该做的事情。 现在,当我按下发送按钮时,应用程序崩溃了。 现在,我已经解决了该问题,似乎不是故意的,但是当我从EditText字段中读取时会发生。 当我取出EditText阅读部件并将填充信息放入其位置时,代码可以正常工作,但是我需要使用它来与EditTexts配合使用。 谢谢。 菜单中选项的全部代码:
case R.id.menu_feedback:
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle(R.string.menu_feedback);
LayoutInflater inflater = this.getLayoutInflater();
// Inflate and set the layout for the dialog
// Pass null as the parent view because its going in the dialog layout
builder.setView(inflater.inflate(R.layout.feedback, null));
// Add the buttons
builder.setNegativeButton(R.string.send, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// User clicked OK button
final EditText nameField = (EditText) findViewById(R.id.EditTextName);
String name = nameField.getText().toString();
final EditText emailField = (EditText) findViewById(R.id.EditTextEmail);
String email = emailField.getText().toString();
final EditText feedbackField = (EditText) findViewById(R.id.EditTextFeedbackBody);
String feedback = feedbackField.getText().toString();
final CheckBox responseCheckbox = (CheckBox) findViewById(R.id.CheckBoxResponse);
boolean bRequiresResponse = responseCheckbox.isChecked();
/* Create the Intent */
final Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND);
/* Fill it with Data */
emailIntent.setType("plain/text");
emailIntent.putExtra(android.content.Intent.EXTRA_EMAIL, R.string.send_email);
emailIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, "Subject");
emailIntent.putExtra(android.content.Intent.EXTRA_TEXT, feedback);
/* Send it off to the Activity-Chooser */
startActivity(Intent.createChooser(emailIntent, "Send mail..."));
dialog.dismiss();
}
});
builder.setPositiveButton(R.string.cancel, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.dismiss();
}
});
// create alert dialog
AlertDialog alertDialog = builder.create();
// show it
alertDialog.show();
return true;
好的,我假设您所有的EditText都写在AlertDialog的feedback layout
文件中,
View dialogView = inflater.inflate(R.layout.feedback, null);
builder.setView(dialogView );
和Edittext一样,
// User clicked OK button
final EditText nameField = (EditText) dialogView.findViewById(R.id.EditTextName);
String name = nameField.getText().toString();
final EditText emailField = (EditText) dialogView.findViewById(R.id.EditTextEmail);
String email = emailField.getText().toString();
final EditText feedbackField = (EditText) dialogView.findViewById(R.id.EditTextFeedbackBody);
String feedback = feedbackField.getText().toString();
实际上,当您放大任何视图并且必须使用该视图的子视图时,则必须使用该视图的引用和findViewById()
方法。 因此,在您的情况下,请使用dialogView.findViewById();
使用builder
或inflater
实例从AlertDialog访问EditText或其他视图,如下所示:
builder.setNegativeButton(R.string.send, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// User clicked OK button
final EditText nameField = (EditText)inflater. findViewById(R.id.EditTextName);
String name = nameField.getText().toString();
final EditText emailField = (EditText)inflater.
findViewById(R.id.EditTextEmail);
String email = emailField.getText().toString();
final EditText feedbackField = (EditText)inflater.
findViewById(R.id.EditTextFeedbackBody);
String feedback = feedbackField.getText().toString();
// your code here..
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