我想显示一个包含消息的对话框/弹出窗口,向用户展示“您确定要删除此条目吗?”并添加一个按钮,上面写着“删除”。当点击“删除”按钮时,它应该删除该条目,否则不会执行任何操作。
我已经为这些按钮编写了一个点击监听器,但是我该如何调用对话框或弹出窗口及其功能呢?
我想显示一个包含消息的对话框/弹出窗口,向用户展示“您确定要删除此条目吗?”并添加一个按钮,上面写着“删除”。当点击“删除”按钮时,它应该删除该条目,否则不会执行任何操作。
我已经为这些按钮编写了一个点击监听器,但是我该如何调用对话框或弹出窗口及其功能呢?
从列表中删除一个条目的代码
/*--dialog for delete entry--*/
private void cancelBookingAlert() {
AlertDialog dialog;
final AlertDialog.Builder alertDialog = new AlertDialog.Builder(MainActivity.this, R.style.AlertDialogCustom);
alertDialog.setTitle("Delete Entry");
alertDialog.setMessage("Are you sure you want to delete this entry?");
alertDialog.setCancelable(false);
alertDialog.setPositiveButton("Delete", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
//code to delete entry
}
});
alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
dialog = alertDialog.create();
dialog.show();
}
Kotlin自定义对话框: 如果您想创建自定义对话框
Dialog(activity!!, R.style.LoadingIndicatorDialogStyle)
.apply {
// requestWindowFeature(Window.FEATURE_NO_TITLE)
setCancelable(true)
setContentView(R.layout.define_your_custom_view_id_here)
//access your custom view buttons/editText like below.z
val createBt = findViewById<TextView>(R.id.clipboard_create_project)
val cancelBt = findViewById<TextView>(R.id.clipboard_cancel_project)
val clipboard_et = findViewById<TextView>(R.id.clipboard_et)
val manualOption =
findViewById<TextView>(R.id.clipboard_manual_add_project_option)
//if you want to perform any operation on the button do like this
createBt.setOnClickListener {
//handle your button click here
val enteredData = clipboard_et.text.toString()
if (enteredData.isEmpty()) {
Utils.toast("Enter project details")
} else {
navigateToAddProject(enteredData, true)
dismiss()
}
}
cancelBt.setOnClickListener {
dismiss()
}
manualOption.setOnClickListener {
navigateToAddProject("", false)
dismiss()
}
show()
}
<style name="LoadingIndicatorDialogStyle" parent="Theme.AppCompat.Light.Dialog.Alert">
<item name="android:windowIsTranslucent">true</item>
<item name="android:windowBackground">@android:color/transparent</item>
<item name="android:windowContentOverlay">@null</item>
<item name="android:windowNoTitle">true</item>
<item name="android:statusBarColor">@color/black_transperant</item>
<item name="android:layout_gravity">center</item>
<item name="android:background">@android:color/transparent</item>
<!--<item name="android:windowAnimationStyle">@style/MaterialDialogSheetAnimation</item>-->
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("This is Title");
builder.setMessage("This is message for Alert Dialog");
builder.setPositiveButton("Positive Button", (dialog, which) -> onBackPressed());
builder.setNegativeButton("Negative Button", (dialog, which) -> dialog.cancel());
builder.show();
这是一种类似于使用几行代码创建警告对话框的方法。
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.shouldDialogOpen
中,shouldDialogOpen
是viewmodel内的可变状态字段,当我们需要显示或关闭对话框时,会更改其值。
有关Jetpack Compose的更多代码示例:- https://androidlearnersite.wordpress.com/2021/08/03/jetpack-compose-1-0-0-sample-codes/
使用Anko(Kotlin开发者的官方库),您可以简单地使用
alert("Alert title").show()
alert("Hi, I'm Roy", "Have you tried turning it off and on again?") {
yesButton { toast("Oh…") }
noButton {}
}.show()
导入 Anko:
implementation "org.jetbrains.anko:anko:0.10.8"
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();
var alertDialog = new AlertDialog.Builder(this) // this: Activity
.SetTitle("Hello!")
.SetMessage("Are you sure?")
.SetPositiveButton("Ok", (sender, e) => { /* ok things */ })
.SetNegativeButton("Cancel", (sender, e) => { /* cancel things */ })
.Create();
alertDialog.Show();
// you can customize your AlertDialog, like so
var tvMessage = alertDialog.FindViewById<TextView>(Android.Resource.Id.Message);
tvMessage.TextSize = 13;
// ...
您可以创建一个Activity并继承AppCompatActivity。然后在清单文件中添加下一个样式:
<activity android:name=".YourCustomDialog"
android:theme="Theme.AppCompat.Light.Dialog">
</activity>
通过按钮和文本视图膨胀它
然后像对话框一样使用它。
例如,在LinearLayout中我填充了下一个参数:
android:layout_width="300dp"
android:layout_height="wrap_content"