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
LayoutInflater inflater = LayoutInflater.from(HistoryActivity.this);
final View vv = inflater.inflate(R.layout.dialog_processing_tts, null);
final AlertDialog.Builder alert = new AlertDialog.Builder(
HistoryActivity.this);
alert.setTitle("Delete");
alert.setView(vv);
alert.setCancelable(false)
.setPositiveButton("Delete", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
databaseHelperClass.deleteHistory(list.get(position).getID());
list.clear();
setAdapterForList();
}
})
.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
final AlertDialog dialog = alert.create();
dialog.show();
其他回答
您可以使用AlertDialog创建对话框。构建器
试试这个:
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("Are you sure you want to delete this entry?");
builder.setPositiveButton("Yes, please", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//perform any action
Toast.makeText(getApplicationContext(), "Yes clicked", Toast.LENGTH_SHORT).show();
}
});
builder.setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//perform any action
Toast.makeText(getApplicationContext(), "No clicked", Toast.LENGTH_SHORT).show();
}
});
//creating alert dialog
AlertDialog alertDialog = builder.create();
alertDialog.show();
要改变Alert对话框的正反按钮的颜色,你可以在alertDialog.show()后面写下面两行;
alertDialog.getButton(AlertDialog.BUTTON_POSITIVE).setTextColor(getResources().getColor(R.color.colorPrimary));
alertDialog.getButton(AlertDialog.BUTTON_NEGATIVE).setTextColor(getResources().getColor(R.color.colorPrimaryDark));
现在最好使用DialogFragment而不是直接创建AlertDialog。
怎么做?参见:https://stackoverflow.com/a/21032871/1390874 为什么?参见:https://stackoverflow.com/a/13765411/1390874
现在与Jetpack撰写引入android,你可以简单地创建警报对话框使用下面的代码
if (viewModel.shouldDialogOpen.value) {
AlertDialog(onDismissRequest = { viewModel.shouldDialogOpen.value = false },
title = { Text("Delete Entry?") },
text = {
Text("Are you sure you want to delete this entry?")
},
dismissButton = {
Button(modifier = Modifier.fillMaxWidth(), onClick = {
viewModel.shouldDialogOpen.value = false
}) {
Text(text = "Cancel")
}
}, confirmButton = {
Button(modifier = Modifier.fillMaxWidth(), onClick = {
viewModel.shouldDialogOpen.value = false
viewModel.beginDelete(recipe)
}) {
Text(text = "Okay")
}
})
}
在viewModel中。shouldDialogOpen, shouldDialogOpen是viewmodel中的一个mutablestate字段,当我们需要显示或解散对话框时,我们会改变它的值。
更多的代码样本Jetpack撰写:- https://androidlearnersite.wordpress.com/2021/08/03/jetpack-compose-1-0-0-sample-codes/
创建这个静态方法,并在任何需要的地方使用它。
public static void showAlertDialog(Context context, String title, String message, String posBtnMsg, String negBtnMsg) {
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setTitle(title);
builder.setMessage(message);
builder.setPositiveButton(posBtnMsg, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
builder.setNegativeButton(negBtnMsg, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
AlertDialog dialog = builder.create();
dialog.show();
}
new AlertDialog.Builder(v.getContext()).setMessage("msg to display!").show();