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
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
其他回答
我在onClick方法中使用这个AlertDialog:
button.setOnClickListener(v -> {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
LayoutInflater layoutInflaterAndroid = LayoutInflater.from(this);
View view = layoutInflaterAndroid.inflate(R.layout.cancel_dialog, null);
builder.setView(view);
builder.setCancelable(false);
final AlertDialog alertDialog = builder.create();
alertDialog.show();
view.findViewById(R.id.yesButton).setOnClickListener(v -> onBackPressed());
view.findViewById(R.id.nobutton).setOnClickListener(v -> alertDialog.dismiss());
});
dialog.xml
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="@+id/textmain"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:gravity="center"
android:padding="5dp"
android:text="@string/warning"
android:textColor="@android:color/black"
android:textSize="18sp"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/textpart2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:gravity="center"
android:lines="2"
android:maxLines="2"
android:padding="5dp"
android:singleLine="false"
android:text="@string/dialog_cancel"
android:textAlignment="center"
android:textColor="@android:color/black"
android:textSize="15sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textmain" />
<TextView
android:id="@+id/yesButton"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="40dp"
android:layout_marginTop="5dp"
android:layout_marginEnd="40dp"
android:layout_marginBottom="5dp"
android:background="#87cefa"
android:gravity="center"
android:padding="10dp"
android:text="@string/yes"
android:textAlignment="center"
android:textColor="@android:color/black"
android:textSize="15sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textpart2" />
<TextView
android:id="@+id/nobutton"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="40dp"
android:layout_marginTop="5dp"
android:layout_marginEnd="40dp"
android:background="#87cefa"
android:gravity="center"
android:padding="10dp"
android:text="@string/no"
android:textAlignment="center"
android:textColor="@android:color/black"
android:textSize="15sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/yesButton" />
<TextView
android:layout_width="match_parent"
android:layout_height="20dp"
android:layout_margin="5dp"
android:padding="10dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/nobutton" />
</androidx.constraintlayout.widget.ConstraintLayout>
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();
这是一种类似于用一行代码创建Alert对话框的方法。
你也可以尝试这种方式,它将为你提供材料样式的对话框
private void showDialog()
{
String text2 = "<font color=#212121>Medi Notification</font>";//for custom title color
AlertDialog.Builder builder = new AlertDialog.Builder(this, R.style.AppCompatAlertDialogStyle);
builder.setTitle(Html.fromHtml(text2));
String text3 = "<font color=#A4A4A4>You can complete your profile now or start using the app and come back later</font>";//for custom message
builder.setMessage(Html.fromHtml(text3));
builder.setPositiveButton("DELETE", new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
toast = Toast.makeText(getApplicationContext(), "DELETE", Toast.LENGTH_SHORT);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();
}
});
builder.setNegativeButton("CANCEL", new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
toast = Toast.makeText(getApplicationContext(), "CANCEL", Toast.LENGTH_SHORT);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();
}
});
builder.show();
}
在材质组件库中,你可以使用MaterialAlertDialogBuilder
MaterialAlertDialogBuilder(context)
.setMessage("Are you sure you want to delete this entry?")
.setPositiveButton("Delete") { dialog, which ->
// Respond to positive button press
}
.setNegativeButton("Cancel") { dialog, which ->
// Respond to positive button press
}
.show()
使用Compose 1.0。X你可以使用:
val openDialog = remember { mutableStateOf(true) }
if (openDialog.value) {
AlertDialog(
onDismissRequest = {
// Dismiss the dialog when the user clicks outside the dialog or on the back
// button. If you want to disable that functionality, simply use an empty
// onCloseRequest.
openDialog.value = false
},
title = null,
text = {
Text(
"Are you sure you want to delete this entry?"
)
},
confirmButton = {
TextButton(
onClick = {
openDialog.value = false
}
) {
Text("Delete")
}
},
dismissButton = {
TextButton(
onClick = {
openDialog.value = false
}
) {
Text("Cancel")
}
}
)
}
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/