如何禁用/启用对话负面的正面button？
请看下面的自定义对话框。 我有对话框上的edittext字段，如果文本字段为空，我想禁用positiveButton 。 我可以得到一个charListener的文本字段，但我不知道我将如何设置positivebuttonbutton来禁用或启用该侦听器？ 正面和负面button的参考是什么？
case DIALOG_TEXT_ENTRY: // This example shows how to add a custom layout to an AlertDialog LayoutInflater factory = LayoutInflater.from(this); final View textEntryView = factory.inflate(R.layout.alert_dialog_text_entry, null); return new AlertDialog.Builder(AlertDialogSamples.this) .setIconAttribute(android.R.attr.alertDialogIcon) .setTitle(R.string.alert_dialog_text_entry) .setView(textEntryView) .setPositiveButton(R.string.alert_dialog_ok, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { /* User clicked OK so do some stuff */ } }) .setNegativeButton(R.string.alert_dialog_cancel, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { /* User clicked cancel so do some stuff */ } }) .create(); }
编辑完整的解决scheme…
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this); builder.setIcon(android.R.drawable.ic_dialog_info); builder.setTitle("Alert dialog title"); builder.setMessage("This is the example code snippet to disable button if edittext attached to dialog is empty."); builder.setPositiveButton("PositiveButton", new DialogInterface.OnClickListener() { public void onClick(DialogInterface arg0, int arg1) { // DO TASK } }); builder.setNegativeButton("NegativeButton", new DialogInterface.OnClickListener() { public void onClick(DialogInterface arg0, int arg1) { // DO TASK } }); // Set `EditText` to `dialog`. You can add `EditText` from `xml` too. final EditText input = new EditText(MainActivity.this); LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT); input.setLayoutParams(lp); builder.setView(input); final AlertDialog dialog = builder.create(); dialog.show(); // Initially disable the button ((AlertDialog) dialog).getButton(AlertDialog.BUTTON_POSITIVE) .setEnabled(false); // OR you can use here setOnShowListener to disable button at first // time. // Now set the textchange listener for edittext input.addTextChangedListener(new TextWatcher() { @Override public void onTextChanged(CharSequence s, int start, int before, int count) { } @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { } @Override public void afterTextChanged(Editable s) { // Check if edittext is empty if (TextUtils.isEmpty(s)) { // Disable ok button ((AlertDialog) dialog).getButton( AlertDialog.BUTTON_POSITIVE).setEnabled(false); } else { // Something into edit text. Enable the button. ((AlertDialog) dialog).getButton( AlertDialog.BUTTON_POSITIVE).setEnabled(true); } } });
下面是编辑历史，可以参考一些更多的细节
这里是一个示例代码，试试这个
AlertDialog.Builder builder = new AlertDialog.Builder(AddSchedule.this); builder.setIcon(android.R.drawable.ic_dialog_info); builder.setTitle("Alert dialog title"); builder.setMessage("Dialog message"); builder.setPositiveButton("Button1", new DialogInterface.OnClickListener() { public void onClick(DialogInterface arg0, int arg1) { //DO TASK } }); builder.setNegativeButton("Button2", new DialogInterface.OnClickListener() { public void onClick(DialogInterface arg0, int arg1) { //DO TASK } }); AlertDialog dialog = builder.create(); dialog.show(); //After calling show method, you need to check your condition and //enable/ disable buttons of dialog if(your_condition_true) dialog.getButton(AlertDialog.BUTTON1).setEnabled(false); //BUTTON1 is positive button
对于负面的button
dialog.getButton(AlertDialog.BUTTON2).setEnabled(false); //BUTTON2 is negative button
对于buttonID ： 参考 alert_dialog.xml
编辑：
而自8级API（ FroYo）以来， setOnShowListener也是如此 ，
AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setPositiveButton(android.R.string.ok, null); AlertDialog dialog = builder.create(); dialog.setOnShowListener(new OnShowListener() { @Override public void onShow(DialogInterface dialog) { if(condition) ((AlertDialog)dialog).getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(false); } }); dialog.show();
编辑
new AlertDialog.Builder(this) .setMessage("This may take a while") .setPositiveButton("OK", new android.content.DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { ((AlertDialog)dialog).getButton(which).setVisibility(View.INVISIBLE); // the rest of your stuff } }) .show();
这些答案都没有真正解决问题。
我使用自定义布局来实现这一点，在该布局中有一个EditText和一个TextWatcher。
final LinearLayout layout = (LinearLayout) inflator.inflate(R.layout.text_dialog, null); final EditText text = (EditText) layout.findViewById(R.id.text_edit); final AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setView(layout); // Now add the buttons... builder.setPositiveButton(R.string.ok, new AlertDialog.OnClickListener() { // Left out for brevity... } builder.setNegativeButton(R.string.cancel, new AlertDialog.OnClickListener() { // Left out for brevity... } // Now add a TextWatcher that will handle enable/disable of save button text.addTextChangedListener(new TextWatcher() { private void handleText() { // Grab the button final Button okButton = d.getButton(AlertDialog.BUTTON_POSITIVE); if(text.getText().length() == 0) { okButton.setEnabled(false); } else { okButton.setEnabled(true); } } @Override public void afterTextChanged(Editable arg0) { handleText(); } @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { // Nothing to do } @Override public void onTextChanged(CharSequence s, int start, int before, int count) { // Nothing to do } }); // Create the dialog AlertDialog d = builder.create(); // show the dialog d.show(); // and disable the button to start with d.getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(false);
这里是完整的代码来启用和禁用对话框的正面button
AlertDialog.Builder builder = new AlertDialog.Builder(this); LayoutInflater layoutInflater = MainActivity.this.getLayoutInflater(); View view = layoutInflater.inflate(R.layout.dialog,null); builder.setView(view); builder.setTitle("Test"); builder.setPositiveButton("ok", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Toast.makeText(MainActivity.this, "Ok clicked", Toast.LENGTH_SHORT).show(); dialog.dismiss(); } }); builder.setNegativeButton("cancel", null); final AlertDialog alertDialog = builder.create(); alertDialog.show(); EditText editText = (EditText)view.findViewById(R.id.mobile_number); alertDialog.getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(false); editText.addTextChangedListener(new TextWatcher() { @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { } @Override public void onTextChanged(CharSequence s, int start, int before, int count) { } @Override public void afterTextChanged(Editable s) { if(s.length()>=1) { alertDialog.getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(true); } else { alertDialog.getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(false); } } });
对于使用视图持有者从数据库列表视图删除logging，您在getview（）方法中使用了此代码。
viewHolder.btn.setOnClickListener（new OnClickListener（）{
@Override public void onClick(View arg0) { // TODO Auto-generated method stub AlertDialog.Builder alertDialog2 = new AlertDialog.Builder( Favorate.this.getParent()); // Setting Dialog Title alertDialog2.setTitle("Confirm Delete..."); // Setting Dialog Message alertDialog2 .setMessage("Are you sure you want delete ?"); // Setting Icon to Dialog alertDialog2.setIcon(R.drawable.delete); // Setting Positive "Yes" Btn alertDialog2.setPositiveButton("YES", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { // Write your code here to execute after // dialog int id = _items.get(position).id; db.deleterecord(id); db.close(); } }); // Setting Negative "NO" Btn alertDialog2.setNegativeButton("NO", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { // Write your code here to execute after // dialog dialog.cancel(); } }); // Showing Alert Dialog alertDialog2.show(); } });
阅读更多
这个dialogFragment会为你做这个工作。 请注意，屏幕旋转后，对话框将保持打开状态，保留用户已input的任何文本。如果您不希望发生这种情况，您需要closures活动的onStop中的片段。 newInstance方法签名可以更改为任何你需要的。
import android.app.Activity; import android.app.Dialog; import android.app.DialogFragment; import android.content.DialogInterface; import android.os.Bundle; import android.support.annotation.Nullable; import android.support.v7.app.AlertDialog; import android.text.Editable; import android.text.TextWatcher; import android.widget.EditText; public class TextViewDialogFragment extends DialogFragment implements DialogInterface.OnClickListener, DialogInterface.OnShowListener, TextWatcher { final static private String TITLE = "title", MESSAGE = "message", IDENTIFIER = "identifier", INPUT_TYPE = "inputType", POSITIVE_TEXT = "pText", NEGATIVE_TEXT = "nText", CANCELABLE = "cancelable"; public TextViewDialogFragment() { super(); } static public TextViewDialogFragment newInstance(int title, @Nullable String message, int identifier, int inputType, int positiveText, int negativeText, boolean cancelable) { TextViewDialogFragment fragement = new TextViewDialogFragment(); Bundle args = new Bundle(); args.putInt(TITLE, title); args.putString(MESSAGE, message); args.putInt(IDENTIFIER, identifier); args.putInt(INPUT_TYPE, inputType); args.putInt(POSITIVE_TEXT, positiveText); args.putInt(NEGATIVE_TEXT, negativeText); args.putBoolean(CANCELABLE, cancelable); fragement.setArguments(args); return fragement; } @Override public Dialog onCreateDialog(Bundle savedInstanceState) { Activity activity = getActivity(); Bundle args = getArguments(); EditText input = new EditText(activity); input.setInputType(args.getInt(INPUT_TYPE)); input.setId(R.id.dialog_edit_text); input.addTextChangedListener(this); AlertDialog.Builder alert = new AlertDialog.Builder(activity); alert.setCancelable(args.getBoolean(CANCELABLE)).setTitle(args.getInt(TITLE)).setMessage(args.getString(MESSAGE)).setView(input).setPositiveButton(args.getInt(POSITIVE_TEXT), this); int negativeText = args.getInt(NEGATIVE_TEXT); if (negativeText != 0) { alert.setNegativeButton(negativeText, this); } AlertDialog dialog = alert.create(); dialog.setOnShowListener(this); return dialog; } @Override public void onShow(DialogInterface dialog) { // After device rotation there may be some text present. if (((EditText)((AlertDialog) dialog).findViewById(R.id.dialog_edit_text)).length() == 0) { ((AlertDialog) dialog).getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(false); } } @Override public void onClick(DialogInterface dialog, int which) { String text = ((EditText)((AlertDialog) dialog).findViewById(R.id.dialog_edit_text)).getText().toString(); ((Callbacks) getActivity()).onTextViewDialogResult(which, getArguments().getInt(IDENTIFIER), text); } @Override public void onCancel(DialogInterface dialog) { ((Callbacks) getActivity()).onTextViewDialogActivityCancelled(getArguments().getInt(IDENTIFIER)); super.onCancel(dialog); } @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { } @Override public void onTextChanged(CharSequence s, int start, int before, int count) { } @Override public void afterTextChanged(Editable s) { ((AlertDialog) getDialog()).getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(s.length() > 0); } void setMessage(String message) { Bundle args = getArguments(); args.putString(MESSAGE, message); setArguments(args); } interface Callbacks { void onTextViewDialogResult(int which, int identity, String text); void onTextViewDialogActivityCancelled(int identity); } }
将实现添加到您的活动（任何types的活动都可以）：
public class Myctivity extends AppCompatActivity implements TextViewDialogFragment.Callbacks { ... }
在您的活动中创builddiaglogFragment，如下所示：
final static int SOMETHING = 1; myDF = TextViewDialogFragment.newInstance(R.string.my_title, "my message", SOMETHING, InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_FLAG_CAP_WORDS | InputType.TYPE_TEXT_FLAG_CAP_SENTENCES, /* Whatever is best for your user. */ R.string.yay, android.R.string.cancel, true);
在你的活动中处理结果如下：
@Override public void onTextViewDialogResult(int which, int identity, String text) { if (which == AlertDialog.BUTTON_NEGATIVE) { // User did not want to do anything. return; } // text now holds the users answer. // Identity can be used if you use the same fragment for more than one type of question. } @Override public void onTextViewDialogActivityCancelled(int identity) { // This is invoked if you set cancelable to true and the user pressed the back button. }
您需要创build资源标识符，以便在res / values下的某处添加此资源
<?xml version="1.0" encoding="utf-8"?> <resources> <item name="dialog_edit_text" type="id"/> </resources>
if(editTextEmailAddress.getText().toString().length()==0) { btnCancelCross.setEnabled(false); } else { btnCancelCross.setEnabled(true); }
这可能会帮助你，谢谢。
