我想显示一个对话框/弹出窗口,向用户显示一条消息“您确定要删除此条目吗?”,其中一个按钮说“删除”。当点击Delete时,它应该删除该条目,否则什么都不删除。
我已经为这些按钮写了一个点击监听器,但我如何调用对话框或弹出窗口及其功能?
我想显示一个对话框/弹出窗口,向用户显示一条消息“您确定要删除此条目吗?”,其中一个按钮说“删除”。当点击Delete时,它应该删除该条目,否则什么都不删除。
我已经为这些按钮写了一个点击监听器,但我如何调用对话框或弹出窗口及其功能?
当前回答
为Kotln开发人员提供最简单的解决方案
val alertDialogBuilder: AlertDialog.Builder = AlertDialog.Builder(requireContext())
alertDialogBuilder.setMessage(msg)
alertDialogBuilder.setCancelable(true)
alertDialogBuilder.setPositiveButton(
getString(android.R.string.ok)
) { dialog, _ ->
dialog.cancel()
}
val alertDialog: AlertDialog = alertDialogBuilder.create()
alertDialog.show()
其他回答
你可以试试这个....
AlertDialog.Builder dialog = new AlertDialog.Builder(MainActivity.this);
dialog.setCancelable(false);
dialog.setTitle("Dialog on Android");
dialog.setMessage("Are you sure you want to delete this entry?" );
dialog.setPositiveButton("Delete", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int id) {
//Action for "Delete".
}
})
.setNegativeButton("Cancel ", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//Action for "Cancel".
}
});
final AlertDialog alert = dialog.create();
alert.show();
欲了解更多信息,请查看此链接…
您可以为此使用AlertDialog,并使用它的Builder类构造一个AlertDialog。下面的例子使用默认的构造函数,它只接受Context,因为对话框将从传入的Context继承适当的主题,但是如果你想这样做,还有一个构造函数允许你指定一个特定的主题资源作为第二个参数。
new AlertDialog.Builder(context)
.setTitle("Delete entry")
.setMessage("Are you sure you want to delete this entry?")
// Specifying a listener allows you to take an action before dismissing the dialog.
// The dialog is automatically dismissed when a dialog button is clicked.
.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// Continue with delete operation
}
})
// A null listener allows the button to dismiss the dialog and take no further action.
.setNegativeButton(android.R.string.no, null)
.setIcon(android.R.drawable.ic_dialog_alert)
.show();
你可以使用下面的代码:
AlertDialog.Builder alertDialog2 = new AlertDialog.Builder(
AlertDialogActivity.this);
// Setting Dialog Title
alertDialog2.setTitle("Confirm Delete...");
// Setting Dialog Message
alertDialog2.setMessage("Are you sure you want delete this file?");
// 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
Toast.makeText(getApplicationContext(),
"You clicked on YES", Toast.LENGTH_SHORT)
.show();
}
});
// 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
Toast.makeText(getApplicationContext(),
"You clicked on NO", Toast.LENGTH_SHORT)
.show();
dialog.cancel();
}
});
// Showing Alert Dialog
alertDialog2.show();
只是当你想解散对话框时要小心——使用dialog.dismiss()。在我的第一次尝试中,我使用了遣散dialog(0)(我可能从某个地方复制),有时它可以工作。使用系统提供的对象听起来是更安全的选择。
这是一个创建Alert对话框的基本示例:
AlertDialog.Builder dialog = new AlertDialog.Builder(MainActivity.this);
dialog.setCancelable(false);
dialog.setTitle("Dialog on Android");
dialog.setMessage("Are you sure you want to delete this entry?" );
dialog.setPositiveButton("Delete", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int id) {
//Action for "Delete".
}
})
.setNegativeButton("Cancel ", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//Action for "Cancel".
}
});
final AlertDialog alert = dialog.create();
alert.show();